Features

Hardened Polycarbonate Lenses (Resistant to Breaking)
Absorptive Dye Encapsulated in Polycarbonate
Surface Scratches Do Not Reduce the Optical Density of the Lenses
Protection Lasts for a Minimum of 10 seconds at Maximum EN 207 Rated Exposure (See Specs Tutorial Tab)
Top and Side Shield Protection
Comfortable Frame Style can be used over Prescription Glasses
LG Series of Laser Glasses: CE Certified EN 207 Compliant (See Specs Tutorial Tab)
LG13 and LG14 are Certified for Laser Alignment (EN 208)

The LG series of laser safety glasses provide CE certified laser radiation protection. The comfortable frame style can be used over the top of prescription lenses and has top and side shields to protect the user's eyes from peripheral laser radiation. The interior dimensions of the LG series of laser goggles are 145 mm x 53 mm and have a 140 mm temple. The lenses have a diagonal length of 68 mm. Each pair of laser safety glasses comes with a protective storage case, a slip-on neck strap, and a cleaning cloth.

Care Instructions
When not being used, the laser safety glasses should be stored in their protective case and in an area where the temperature does not exceed 80 °F (26.6 °C). The laser safety glasses can be cleaned using 91% isopropyl alcohol and wiped with a cotton swab.

OD to % Transmittance Conversions

OD	Transmittance	OD	Transmittance
0.0	100%	5.0	0.001%
1.0	10%	6.0	0.0001%
2.0	1%	7.0	0.00001%
3.0	0.1%	8.0	0.000001%
4.0	0.01%	9.0	0.0000001%

OD = Optical Density
T = Transmittance (decimal)

*** This guide is not intended as a substitution for reading and understanding the ANSI Z136 or EN 207 or EN 208 Laser Safety Standards. It is only meant to provide an introductory overview to understanding the markings on the lenses of the LG series of laser glasses. ***

Indelibly printed on the laser safety glasses are two sets of numbers: Optical Density (OD) and L-Rating, which are both used to indicate the level of protection provided for specific wavelength ranges. The OD numbers idelibly printed on the laser safety glasses can be used to determine if the glasses meet the ANSI Z136 standards of laser safety protection for a given laser product. In addition, the OD can be used to calculate the transmittance (T) of light through the laser safety glasses.

Optical Density = Log₁₀(1/T) or T = 10^-OD.

The European EN 207 standard for laser safety glasses requires that the protective eyewear be labeled with the CE mark and that the L-Rating specifications are indelibly printed on the lens. In addition, the lenses and frames must be able to provide the stated level of protection for 10 seconds or 100 pulses depending on the mode of the laser. The L-Rating is composed of 3 components: a wavelength range, a laser mode designation, and a scale number. The wavelength range engraved on the laser safety glasses is given in nm and is extremely important since the level of protection provided by the laser safety glasses is wavelength dependent. The laser mode designation is based on the duration of laser pulse emitted by the laser.

Laser Mode Designation

Laser Mode	Engraved Symbol	Pulse Duration
Continuous Wave (CW)	D	>0.25 s
Pulsed Mode	I	>1µs - 0.25 s
Giant Pulsed Mode	R	1 ns - 1µs
Mode Locked	M	< 1ns
Please refer to the official EN 207 standard that can be purchased from BSI.

The scale number (Ln) is intended to be used in conjunction with the wavelength range and the laser mode designation in order to determine if the laser safety glasses meets the minimum required level of protection for a given laser; see the table below. If one component of the L-Rating is shared, a plus sign is used to separate multiple wavelength ranges or laser modes and scale numbers in order to save space. In addition, a greater than, >, sign preceding a wavelength range indicates that the mode and scale number ratings for that wavelength range are valid for wavelengths of light greater than the bottom number in the range up to and including the top number in the range. For example, if the glasses were rated as 330-370 D L2 and >370-500 D L3 then at 370 nm the rating would be D L2 and for all wavelengths greater than 370 nm up to and including 500 nm would be rated at D L3.

European Norm for the Selection of Laser Safety Glasses

Wavelength Range	Laser Mode	Maximum Power Density (P) or Maximum Energy Density (E)	Minimum Scale Number (Ln)
180 - 315 nm	D	1x10^n-3 W/m²	log₁₀(P)+3
	I and R	3x10ⁿ⁺¹ J/m²	log₁₀(E/3)-1
	M	1x10ⁿ⁺¹⁰ W/m²	log₁₀(P)-10
315 - 1400 nm	D	1x10ⁿ⁺¹ W/m²	log₁₀(P)-1
	I and R	5x10^n-3 J/m²	log₁₀(E/5)+3
	M	1.5x10^n-4 J/m²	log₁₀(E/1.5)+4
1400 - 1000000 nm	D	1x10ⁿ⁺³ W/m²	log₁₀(P)-3
	I and R	1x10ⁿ⁺² J/m²	log₁₀(E)-2
	M	1x10ⁿ⁺¹¹ W/m²	log₁₀(P)-11
Please refer to the official EN 207 standard that can be purchased from BSI.

There are two ways to use the table above: start with the scale number and calculate the maximum safe power density or start with a power density and calculate the minimum safe scale number. This is demonstrated by the two examples below.

Example 1: The LG3 laser safety glasses have an L-Rating line that reads "180-315 D L7 + IR L4". So if the LG3 glasses are being used with a 10 µs pulsed 280 nm light source the table above can be referenced to find that, E=3x10ⁿ⁺¹ J/m², where in this example the scale number is L4 so n=4. As a result, when the LG3 laser safety glasses are being used in this situation the maximum power density of the light source should not exceed 3x10⁵ J/m².

Example2: A CW Krypton Ion laser lasing at 647.1 nm has a maximum power density of 2.2x10⁴ W/m². Using the table above, the scale number can be calculated using Ln=log₁₀(P)-1, which results in a rounded up scale number of 4. The LG4 laser safety glasses meet the safety specifications of the European EN 207 standard for this example.

Alignment Rating (EN 208)

The LG13 and LG14 glasses are rated for laser alignment applications. This rating allows the lens to transmit a portion of the light for alignment purposes, while attenuating the light to eye-safe power levels in the event of accidental direct exposure to a beam. The rating is given as RB# where # is replaced by the minimum optical density at the specified wavelength or wavelength range (in nm). Along with this RB value is the maximum allowable power and energy of the laser over a Ø7 mm aperture. Power is given for pulses greater than 0.2 ms, while energy is specified for pulses from 1 ns to 0.2 ms. When using a pulsed laser, a correction factor of N1/4 must be multiplied by the maximum energy rating, replacing N with the number of pulses the laser produces in a 10 s interval.

Example: The LG14 laser safety glasses have an alignment rating of 1 W 2 x 10^-4 J 532 RB3. At 532 nm, the glasses will have an optical density between 3 and 4, correlating to transmission between 0.1% and 0.01%. The maximum power/energy over a Ø7 mm aperture that these glasses can be used with at 532 nm is 1 W for CW or pulses greater than 0.2 ms, and 2 x 10^-4 J for pulses from 1 ns to 0.2 ms.

Please refer to the official EN 208 standard that can be purchased from BSI.

dBm to mW Power Conversions

dBm	mW	dBm	mW
0.0	1.0000	10.0	10.0000
2.0	1.5849	20.0	100.0000
4.0	2.5119	30.0	1,000.0000 (1 W)
6.0	3.9811	40.0	10,000.0000 (10 W)
8.0	6.3096	50.0	100,000.0000 (100 W)

P(mW) = Power in mW

Light Exiting a Fiber

NA	Divergence Half Angle, Θ	Beam Area @25.4 mm (1") From Fiber
0.10	5.7°	20 mm²
0.15	8.6°	46 mm²
0.20	11.5°	83 mm²
0.25	14.4°	133 mm²
0.30	17.4°	199 mm²
0.35	20.4°	280 mm²
0.40	23.5°	383 mm²
0.45	26.7°	512 mm²
0.50	30.0°	675 mm²

Note: The values in this table are rounded down to provide conservative beam areas.

When working with fiber optics, light emitted directly from the endface of a fiber is diverging. Thus, the power density is decreasing as the beam spreads and the danger of damage to the eye decreases. The table to the left lists the beam area created by light exiting a fiber for fibers with numerical apertures (NA) between 0.10 and 0.50. If you know the total power emitted from the fiber, you can calculate the power density at 25.4 mm (1") from the fiber tip. This power density will allow you to determine the safe fiber-tip viewing distances.

Fiber Divergence

Laser Safety and Classification

Safe practices and proper usage of safety equipment should be taken into consideration when operating lasers. The eye is susceptible to injury, even from very low levels of laser light. Thorlabs offers a range of laser safety accessories that can be used to reduce the risk of accidents or injuries. Laser emission in the visible and near infrared spectral ranges has the greatest potential for retinal injury, as the cornea and lens are transparent to those wavelengths, and the lens can focus the laser energy onto the retina.

Safe Practices and Light Safety Accessories

Thorlabs recommends the use of safety eyewear whenever working with laser beams with non-negligible powers (i.e., > Class 1) since metallic tools such as screwdrivers can accidentally redirect a beam.
Laser goggles designed for specific wavelengths should be clearly available near laser setups to protect the wearer from unintentional laser reflections.
Goggles are marked with the wavelength range over which protection is afforded and the minimum optical density within that range
Laser Barriers and Blackout Materials can prevent direct or reflected light from leaving the experimental setup area.
Thorlabs' Enclosure Systems can be used to contain optical setups to isolate or minimize laser hazards.
All beams should be terminated at the edge of the table, and laboratory doors should be closed whenever a laser is in use.
Do not place laser beams at eye level.
Carry out experiments on an optical table such that all laser beams travel horizontally.
Remove unnecessary reflective items such as reflective jewelry (e.g., rings, watches, etc.) while working near the beam path.
Be aware that lenses and other optical devices may reflect a portion of the incident beam from the front or rear surface.
Operate a laser at the minimum power necessary for any operation.
If possible, reduce the output power of a laser during alignment procedures.
Use beam shutters and filters to reduce the beam power.
Post appropriate warning signs or labels near laser setups or rooms.
Use laser sign lightboxes if operating Class 3R or 4 lasers (i.e., lasers requiring the use of a safety interlock).
Do not use Laser Viewing Cards in place of a proper Laser Barrier or Beam Trap.

Laser Classification

Lasers are categorized into different classes according to their ability to cause eye and other damage. The International Electrotechnical Commission (IEC) is a global organization that prepares and publishes international standards for all electrical, electronic, and related technologies. The IEC document 60825-1 outlines the safety of laser products. A description of each class of laser is given below:

Class	Description	Warning Label
1	This class of laser is safe under all conditions of normal use, including use with optical instruments for intrabeam viewing. Lasers in this class do not emit radiation at levels that may cause injury during normal operation, and therefore the maximum permissible exposure (MPE) cannot be exceeded. Class 1 lasers can also include enclosed, high-power lasers where exposure to the radiation is not possible without opening or shutting down the laser.
1M	Class 1M lasers are safe except when used in conjunction with optical components such as telescopes and microscopes. Lasers belonging to this class emit large-diameter or divergent beams, and the MPE cannot normally be exceeded unless focusing or imaging optics are used to narrow the beam. However, if the beam is refocused, the hazard may be increased and the class may be changed accordingly.
2	Class 2 lasers, which are limited to 1 mW of visible continuous-wave radiation, are safe because the blink reflex will limit the exposure in the eye to 0.25 seconds. This category only applies to visible radiation (400 - 700 nm).
2M	Because of the blink reflex, this class of laser is classified as safe as long as the beam is not viewed through optical instruments. This laser class also applies to larger-diameter or diverging laser beams.
3R	Lasers in this class are considered safe as long as they are handled with restricted beam viewing. The MPE can be exceeded with this class of laser, however, this presents a low risk level to injury. Visible, continuous-wave lasers are limited to 5 mW of output power in this class.
3B	Class 3B lasers are hazardous to the eye if exposed directly. However, diffuse reflections are not harmful. Safe handling of devices in this class includes wearing protective eyewear where direct viewing of the laser beam may occur. In addition, laser safety signs lightboxes should be used with lasers that require a safety interlock so that the laser cannot be used without the safety light turning on. Class-3B lasers must be equipped with a key switch and a safety interlock.
4	This class of laser may cause damage to the skin, and also to the eye, even from the viewing of diffuse reflections. These hazards may also apply to indirect or non-specular reflections of the beam, even from apparently matte surfaces. Great care must be taken when handling these lasers. They also represent a fire risk, because they may ignite combustible material. Class 4 lasers must be equipped with a key switch and a safety interlock.
All class 2 lasers (and higher) must display, in addition to the corresponding sign above, this triangular warning sign

Please Give Us Your Feedback

Email		Feedback On
(Optional)
Contact Me:
Your email address will NOT be displayed.

Please type the following key into the field to submit this form:

Click Here if you can not read the security code.
This code is to prevent automated spamming of our site
Thank you for your understanding.

Would this product be useful to you? Little Use 1 2 3 4Very Useful

Enter Comments Below:

Characters remaining 8000

Posted Comments:

Poster: junghyup

Posted Date: 2013-03-13 18:20:54.85

what is the width of these laser safety glasses? And what glasses do I need to choose for my 561 nm green laser?

Poster: tcohen

Posted Date: 2013-03-14 13:20:00.0

Response from Tim at Thorlabs: The dimensions for each laser safety glasses can be found in the spec sheet. The interior is 145mm x 53mm and have a 140mm temple. The diagonal of the lenses is 68mm. In most cases, we would chose based on the description I provided earlier in the feedback tab and using our “Specs Tutorial” tab. However, in your case the wavelength falls outside our specified ranges. We can supply some custom glasses and will need to discuss your laser output to provide a solution.

Poster: heather.duschl

Posted Date: 2013-02-01 13:20:32.32

My lab is looking for a laser safety goggle solution for a super-continuum laser. Would it be possible to get custom glasses that block all light above a wavelength of 400nm?

Poster: jlow

Posted Date: 2013-02-06 16:36:00.0

Response from Jeremy at Thorlabs: We do not have any safety goggles that block all the visible light. I will get in contact with you directly to discuss about this further.

Poster: tcohen

Posted Date: 2013-01-10 10:28:00.0

Response from Tim at Thorlabs: Thank you for contacting us. You can determine appropriate safety goggles through the European EN 207 standard. Determine the power density, wavelength and mode you will be working with. Assuming you are working with a 2mm beam diameter at 100mW, 473nm and 593nm, both CW, these fall under the same calculation class. Please see the “Specs Tutorial” for a description of this calculation. Assuming the parameters above, you would be looking for a minimum L rating of D(CW laser) LB4 for both 473nm and 593nm. Since these wavelengths fall right in the middle of visible, it may be more appropriate to choose two goggles to keep your visible light transmission higher if not using the sources simultaneously. Please contact us and consult with your laser safety officer if you have any questions.

Poster: mv780

Posted Date: 2012-12-19 15:36:08.437

Hi, I was wondering which glasses you would advice for use for 100mW 473nm DPSS and 100mW 593nm DPSS lasers? Thanks

Poster: tcohen

Posted Date: 2012-07-18 10:31:00.0

Response from Tim at Thorlabs: Thank you for contacting us! We will need to discuss your OD requirements. I will contact you directly to determine if we can provide a custom that suits your source.

Poster: mathieu.maisonneuve

Posted Date: 2012-07-16 14:42:49.0

Are you doing custom glasses for supercontinuum use. I got a fianium supercontinuum laser and I want to block all light after 550nm (range of laser 550 - 2500nm) ! Thanks.

Poster: sharrell

Posted Date: 2012-04-18 15:29:00.0

Response from Sean at Thorlabs: Thank you for your feedback. I’m sorry you had a hard time reading our plot. I've sent you an Exel file with the LG6 data directly. For the LG6, there is a steep slope between 400 and 500 nm which will make the value at 455 nm difficult to determine, but from the values on the plot, it is approximately OD = 3. We recommend discussing the choice of laser safety glasses with your laser safety officer. We will be adding downloadable data files as well as easier to read plots to our website soon.

Poster: phila

Posted Date: 2012-04-18 10:38:02.0

Could I please get a more detailed OD vs lambda plot? What is OD at 455 nm?

Poster: bdada

Posted Date: 2012-03-15 10:58:00.0

Response from Buki at Thorlabs to utsavdeepak.dave: Thank you for participating in our feedback forum. To get more detailed information from the OD graphs, please click the "zoom" hyperlink at the bottom of the graph. The information from each graph is corroborated by the specifications table next to the graph. For your 445nm laser, we have several options that provide an OD greater than 3. For example, LG2 has an OD of 6+, while LG3 and LG10 have an OD of 7+. Please note that we provide an OD to transmission conversion table in the "Overview" section on this webpage. For a 1W laser, we highly recommend you discuss your laser safety requirements with your laser safety officer to ensure you purchase the appropriate goggles. Please contact TechSupport@thorlabs.com if you have any questions.

Poster: utsavdeepak.dave

Posted Date: 2012-03-12 10:09:16.0

Hello, I wish to know which product would be most suited for a class 4 laser (blue, 445nm, 1W total optical output) such that its possible to view the laser safely. I suppose OD~3.3 is required at this wavelength. Are there any products that match up to this requirement? Some of the products listed on the website seem to match up but in those products, the OD curves are sloping at this wavelength and in the others where it is constant, the value is either too high or low. Hence please notify if there are glasses available with OD~3.3 or thereabouts @ 445 nm. Thank you.

Poster: anthony.marriott

Posted Date: 2012-02-13 11:56:20.0

I need a pair of safety glasses to cover 670nm 5mW, 639 30mW and 780nm 50mW CW laser diodes if that is possible with a single pair. They would be used for viewing beam during alignment, but not directly looking at beam. mainly used to protect engineers in reflected light. I'm not sure what pair to select, the LG4 covers the range but would they cut out to much light for teh low powered diode to be visable?

Poster: bdada

Posted Date: 2012-02-02 20:16:00.0

Response from Buki at Thorlabs: Thank you for participating in our feedback forum. The LG2, LG3, and LG10 all provide you with an OD of 6+ or better at 405nm, so it would be a matter of preference how much visible light transmission you need to ensure appropriate visibility while you wear the goggles. Please contact TechSupport@thorlabs.com if you have further questions or concerns about choosing the laser goggles best suited for your application.

Poster: murali.samiyappan

Posted Date: 2012-01-30 22:51:39.0

I am planning to purchase goggles for blue laser 405nm wavelength & OD 6+. Which would you recommend among LG2(19%VLT), LG3(48%VLT) and LG10(35%VLT)? Would a higher VLT percentage be considered better or otherwise?

Poster: bdada

Posted Date: 2012-01-12 20:55:00.0

Response from Buki at Thorlabs: An OD of 6+ is a transmission of 0.0001%. We have an OD to % transmission table on the web page that should help you determine how much light will be transmitted through the goggles. The LG2 goggles you referenced permit 19% visible light transmission. If you are concerned about seeing your 405nm beam during alignment, please consider one of our viewing cards like the VRC1. I have included a link to our viewing cards below. Please contact TechSupport@thorlabs.com if you have any questions.

Poster: jessie.r.weber

Posted Date: 2012-01-12 11:12:07.0

which goggles would you recommend for 100mW (0.7mm diameter) 405nm laser alignment? would the L2 (OD of 6+ @ 405) be transmissive enough to see the beam? thank you!

Poster: bdada

Posted Date: 2011-09-21 14:52:00.0

Response from Buki at Thorlabs: The right type of goggles would depend highly on the environmental condition (i.e. intensity of backlighting), whether you are looking straight into the beam or looking at reflections, the object from which the beam reflects. We have contacted you to discuss different options from our selection of laser goggles, but please note that you should reveiw the specifications of the goggles with your laser safety officer to determine the appropriate one for your application.

Poster: yvan.quintal

Posted Date: 2011-09-05 12:11:28.0

Hi, I am using a Bosch Laser distance measurer model GLR 225. It is a laser class 2, Laser diode 635 nm, smaller than 1 mw. Measuring time max: 4 sec, measuring time type: smaller than 0,5 sec. Wich model of safety glasses I may buy to protect my eyes and aalso be able to see correctly the read beam(without looking in directly on it)line and having a good visibilty of the objects arounf while working? Regards, Yvan cel: 514-238-9059

Poster: jjurado

Posted Date: 2011-02-28 09:37:00.0

Response from Javier at Thorlabs to nirmal.virdee: Thank you very much for contacting us with your request. The LG2 glasses should provide enough eye protection for your experiment. They are specified with an optical density value of 3 in the range of 820-1720 nm, which corresponds to a transmission value of 0.1%. So, at 20 dBm, or 100 mW, only a small fraction of light will be transmitted through the glasses (100 uW), which constitutes no harm for the eye. Keep in mind that this is assuming a focused or collimated laser; however, if we factor in the divergence from the tip of the fiber, the actual incident light onto the glasses will be much less.

Poster: nirmal.virdee

Posted Date: 2011-02-25 20:33:27.0

I have a group that is working on DWDM fiber optic equipment, including EDFA amplifiers, that have output levels of about 20dBm on single mode fiber (9um core). These operate in the C-band, 1528nm - 1565nm. I need to buy safety glasses for the engineers but cannot determine which one is the right one. Can you please let me know which one is the right one and why? I was thinking LG2 but its level of protection does not seem sufficient. Maybe I am not calculating it correctly. Thanks, Nirmal.Virdee@adtran.com.

Poster: jjurado

Posted Date: 2011-02-18 09:25:00.0

Response from Javier at Thorlabs to pillippe.rondeau: Thank you very much for submitting your feedback. The current EN 207 L ratings are still valid. We are currently in the process of re-certifying all of our laser safety glasses. Once all have been re-tested and re-certified to the LB-ratings (the test conditions changed slightly, and in some cases the current ratings will increase and the covered wavelength ranges will broaden), we will present new specifications printed on the lenses of laser glasses and and new support documentation. If you require LB-rating documentation, we may be able to provide a preliminary copy.

Poster: philippe.rondeau

Posted Date: 2011-02-17 06:17:08.0

EN 207 standard has been modified (from june 2010)and induces new tests and marking of the laser safety glasses : could you provide informations concerning the compliance of these safety glasses with the new standard

Poster: jjurado

Posted Date: 2011-02-03 11:36:00.0

Response from Javier at Thorlabs to ozieseniss: Thank you very much for submitting your inquiry. Actually, any of our LG series laser safety glasses would work well for eye protection in the 180-320 nm range. If you refer to the OD Specs chart, you will see that the optical density of all of the LG glasses falls in the 5 to 7 OD value in the 190 to ~400 nm range. This translates into transmission values of 0.001% to 0.00001% (you can visit the Specs Tutorial tab for more info). If 180-320 nm is the only wavelength of concern, then we would suggest using our LG6 glasses, which have an OD of 7 in the range of 190-398 nm. Please note that we stronly recommend having your lab safety technician review the specifications of these glasses before they are used in your experiment. I will contact you directly in case you have further questions.

Poster: ozieseniss

Posted Date: 2011-02-02 17:44:07.0

Dear Thorlabs Team, Im looking for safety glasses that cover the spectrum of concern for biological safety and health in the 180-320 nm range. The UVC radiation system we are using for surface disinfection has a high irradiation intensity of 70 mW/cm² at 254 nm (in a 2 cm distance from the quartz glass plate). So, Im looking for something that actually covers the 254 nm range....what do you recommend? Thanks

Poster: Adam

Posted Date: 2010-04-28 13:45:17.0

A response from Adam at THorlabs: We currently do not sell one set of glasses that will block 1064nm, 694nm and 532nm effectively. We can provide the LG10 glass, which will block the 1064nm and the 532nm light. To block the 694nm light, I would recommend the LG7. We may be able to offer a custom version that may cover all of your wavelengths. Please email techsupport@thorlabs.com if you are interested in a custom option. Please note that we always recommend reviewing these items with a safety officer at your company before purchasing them.

Poster:

Posted Date: 2010-04-28 12:06:33.0

I need protection for 1064nm, 694nm, and 532nm...what do you recommend?

Poster: Adam

Posted Date: 2010-04-13 08:58:17.0

A response from Adam at Thorlabs to mozaffari: The glasses we currently provide that will block light at 532nm are the LG10 and LG3. The LG10 will block light from 190nm-534nm with an OD of 7+, while the LG3 will block light from 190nm-532nm with an OD of 7+.

Poster: mozaffari

Posted Date: 2010-04-13 01:56:40.0

I need protection from 532 nm in addition to the spec, any solutuon? Thanks

Poster: klee

Posted Date: 2009-11-20 15:58:10.0

A response from Ken at Thorlabs to marcoc: The L-rating for the LG9 is L5 for 720-1075 nm. We may be able to provide a custom goggle. Please send your requirements to techsupport@thorlabs.com so that we can work on a quotation for you.

Poster: marcoc

Posted Date: 2009-11-19 16:56:00.0

Hi, Can you provide the ratings of LG9 for mode lock laser ? I would like to use LG3 for second and third harmonic generation (starting with 800nm, fs laser). The problem is that LG3 doesnt stop the fundamental. Would you think its possible to add a coating to reflect 750-850nm ? Can you provide custom made combination ? In this case can I send you table of glasses needed ? thanks, marco

Poster: jens

Posted Date: 2009-06-04 08:08:35.0

A reply from Jens at Thorlabs: we can offer a custom solution for this combination. I will send you the details for that.

Poster: olsonaj

Posted Date: 2009-06-03 16:48:31.0

Hello. I am interested in glasses that have OD 3+ at 780nm and OD 7+ at 1550nm. I didnt see any of yours listed as having those properties. Can ThorLabs combine two lenses to create such glasses?

Poster: Laurie

Posted Date: 2009-04-13 08:18:26.0

Response from Laurie at Thorlabs to aidi: We would recommend the LG4 blue lens, which has an optical density that is >5 for both 633 nm and 780 nm light. The LG4 goggles are ANSI Z136 compliant.

Poster: aidi

Posted Date: 2009-04-08 23:11:50.0

Could you suggest which glass is suitable for working free-space optic setup with 780nm laser diode and 633nm HeNe laser application and also comply with safety requirement? Thank you.

Poster: Tyler

Posted Date: 2009-03-17 07:22:30.0

A response from Tyler at Thorlabs to jdonnelly: The LG1 laser glasses are not rated at 1500 nm. The LG2 laser glasses are rated with an OD of 3+ at 1500 nm. Thank you for your interest in our products.

Poster: jdonnelly

Posted Date: 2009-03-16 18:36:04.0

I need OD3 at 1500 nm. Will LG1 goggles work?

Poster: Greg

Posted Date: 2009-01-26 16:02:27.0

A response from Greg at Thorlabs to kebb: Thank you for purchasing Thorlabs products. The LG series of laser safety goggles are Ansi Z87 compliant.

Poster: kebb

Posted Date: 2009-01-26 15:07:34.0

Hello, I purchased a pair of LG1 glasses from you. Are these glasses Ansi Z87 compliant? Thank you, Keith Ebbecke

Poster: Laurie

Posted Date: 2008-12-05 11:39:41.0

Response from Laurie at Thorlabs to sebastian.marschall: Unfortunately, we do not have data on the LG1 goggles beyond 1050 nm. Although we can try to obtain this data for you, that wavelength is outside the specified range. Hence, we would be hesitant to suggest it. One of the members of our technical support staff will be contacting to you so we can make a goggle suggestion based on your application.

Poster: sebastian.marschall

Posted Date: 2008-12-05 10:27:31.0

Do you have any numbers for the LG1 filter beyond 1090 nm? Does the OD drop very steeply? For my application D L4 up to 1150 nm would be preferable.

Poster: Laurie

Posted Date: 2008-12-02 11:19:55.0

Response from Laurie at Thorlabs to bamberc: For an OD>4 at 405 nm, you have several options: LG2, LG3, or LG10. You can see the OD as a function of wavelength for each type of google on our website. The ones Ive recommended here have an actual rating at 405 nm. Thank you for your interest in our products. If you have additional questions, please let us know.

Poster: bamberc

Posted Date: 2008-12-02 10:57:05.0

Would you have glasses for 405nm? OD 4 would be good.

Poster: Tyler

Posted Date: 2008-06-25 08:58:50.0

A response from Tyler at Thorlabs to reza1729: I will email you a more detailed response but here is a summary. 1) The recommended storage temperature is for long term storage of laser glasses that are not being used. Please keep your laser glasses in the lab where they are needed. 2) The L-ratings for each pair of laser glasses are listed on the web page and on the spec sheet. For information on how to interpret the rating please see the information contained on the "Specs Tutorial" tab or contact one of our application engineers. 3) The peripheral protection is good but precautions should always be taken to avoid exposure to laser beams. 4) Burn marks on the glasses indicated direct exposure to a laser beam. The glasses should be replaced and the laboratory procedures reviewed so that future incidents do not occur. Cracked lenses or frames also warrant replacement of the glasses. Surface scratches on the lenses do not affect the function of the laser glasses as long as they do not impede vision. Thank you for your questions and for your interest in our product.

Poster: reza1729

Posted Date: 2008-06-24 00:31:48.0

I am very interested in your product. However, I have some important questions that I would like to have answered as soon as possible before I purchase the laser safety goggles. First, the site says that goggles should be stored in a room of less than 80 degrees F. How strict is the requirement? My lab is about that temperature, sometimes higher, sometimes lower. Would it be a better to store the frames in my home which is cooler and carry the goggles in my backpack on the days I need them? Could the goggles be stored in a refrigerator? Second, I was wondering if the orange lenses protect from direct exposure from an argon laser? I know this depends on the power of the laser, but what powers are protected. Third, I noticed the goggles dont have complete peripheral protection. Are there any precautions I need to take about laser beams from the side? Fourth, what sort damage should I keep an eye for on the goggle? I understand that goggles should be periodically checked for damages, but I was wondering if certain damages I should be looking for.

Poster: Tyler

Posted Date: 2008-04-14 13:36:21.0

Response from Tyler at Thorlabs to srubin: Thank you for pointing out the spelling error. We have updated the presentation.

Poster: srubin

Posted Date: 2008-04-04 23:30:29.0

I dont think google makes UV safety goggles yet. On the UV ones you might want to word it safety Goggles and not googles.

Poster: technicalmarketing

Posted Date: 2007-09-27 14:34:45.0

In response to your question, VTL stands for visible transmitted light. It is often times abbreviated VLT (Visible Light Transmission). This value is a measure of how well you can see with these glasses on because it tells you how much visible light gets through them. In other words, if you purchase a pair with VLT of 12%, you might want to take them off before going down stairs and such because you will not be able to see well. We have updated the webpage to not use an abbreviation.

Poster: acable

Posted Date: 2007-09-27 12:20:59.0

VTL? What does it mean.

Poster: technicalmarketing

Posted Date: 2007-09-26 16:44:33.0

Based on several requests, we have moved the optical density versus wavelength plots to the subgroups for each product. We hope that you find this information useful.

Poster: acable

Posted Date: 2007-09-11 17:21:15.0

Clicking through to the plots seems silly when there is all that space available next to each photograph of the glasses. The current plots that are combined with the photo are basically useless, why not just enlarge these plots and place them along side the photos. The little bit of text that is provided could be a sub-header under the title to each plot.

Poster: TechnicalMarketing

Posted Date: 2007-09-11 15:04:31.0

Thank you for your presentation comments. It is always a pleasure to get feedback from our customers. With regards to the two comments posted, larger OD versus wavelength plots can be found under the Drawings & Documents Tab if you click on the specs sheet. I hope that you find these useful. As for the dual-use question, it would be difficult to provide general information that would be beneficial to a wide group since the correct saftety goggles are highly application specific. If you do have questions about which eyewear would be best suited to your individual application, I would recommend that you speak to our applications engineers by calling 1-973-300-3000.

Poster: russ.ferriday

Posted Date: 2007-08-19 20:19:05.0

It would be helpful to provide recommendations based on performance/compliance for common spectra (e.g. 532nm, 635nm) and indicate which are the preferred choice for a dual-use, e.g., for 532 & 635.

Poster: cjohns

Posted Date: 2007-08-16 11:56:25.0

It would be helpful if you offer a "Graphs" tab which shows a more detailed plot of OD vs Wavelength for easy reference and quick comparison between models.

Click on any phrase below to search our site using our new Search Engine: