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Laser Viewing Cards
- Detect Wavelengths from UV to MIR
- Handheld Photosensitive and Liquid Crystal Cards
VRC1
VRC2
VRC5
VRC4
VRC6
250 to 540 nm
400 to 640 nm
and 800 to 1700 nm
700 to 1400 nm
790 to 840 nm,
870 to 1070 nm,
and 1500 to 1590 nm
1500 to >13,200 nm
Please Wait
Features
- Detector Cards for UV, Visible, NIR, or MIR Wavelength Ranges
- Detect Radiation as Low as 1 nW/cm2
- Wavelength Range or Sensitivity Curve Printed on Card
Thorlabs offers a selection of detector cards for use with UV, Visible, Near IR (NIR), or Mid IR (MIR) radiation. These cards are fabricated from either plastic with a photosensitive region or metal with a liquid-crystal film. The card's light-sensitive detector area allows for the easy location of a UV, Visible, NIR, or MIR laser beam and its focal point. To facilitate their use during alignment procedures, the detection region of every card on this page except the VRC5 extends all the way to the edge of the card, all but the VRC5 feature two engraved reticles for use in laser beam collimation.
Please note that these detector cards are not intended to be used as laser beam blocks, and appropriate safety measures should be taken when working with laser beams. See the Laser Safety tab for details.
| VRC6 Spot Imagesa | |||||
|---|---|---|---|---|---|
| Power Density | Detected Spot Size | Spot Image on Card | Power Density | Detected Spot Size | Spot Image on Card |
| 0.3 W/cm2 | Ø0.5 mm |  | 1.6 W/cm2 | Ø0.9 mm |  |
| 0.6 W/cm2 | Ø0.6 mm |  | 2.0 W/cm2 | Ø1.0 mm |  |
| 0.9 W/cm2 | Ø0.7 mm |  | 2.3 W/cm2 | Ø1.1 mm |  |
| 1.1 W/cm2 | Ø0.8 mm |  | 2.6 W/cm2 | Ø1.1 mm |  |
| 1.4 W/cm2 | Ø0.9 mm |  | 2.8 W/cm2 | Ø1.2 mm |  |
Click to Enlarge
The spot size on the VRC6 MIR detector card will vary depending on beam power. The graph above displays the results of a test done using a diode with a Ø0.78 mm spot size. The ambient temperature of the lab was 23 °C.
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.
- A fiber-pigtailed laser should always be turned off before connecting it to or disconnecting it from another fiber, especially when the laser is at power levels above 10 mW.
- 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 |  |
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| Posted Comments: | |
Poster: Posted Date:2016-04-05 00:31:49.21 Can we have these in the form of alignment disks, such as the VRC2D1's which can be mounted on alignment targets? thanks! Poster:besembeson Posted Date:2016-04-05 11:30:55.0 Response from Bweh at Thorlabs USA: Thanks for your feedback. We will look into expanding these alignment disks to include the VRC1 as you suggested. Poster:berkdiler Posted Date:2016-03-23 16:31:40.833 I work with a wide range of IR wavelengths. I see online that there are materials to view IR without recharging. I do have your florescent viewers however since they bleach extremely fast the SM1 mounted ones are useless (since they are stationary). I see that the material VR4 only works for a short range of wavelengths however there seems to be a similar material http://www.zap-it.com/products/view-it-ir-laser-spot-targets on this website that works with a much broader wavelength. Another material I found online is http://www.sintecoptronics.com/irdetector.asp, which is a doubling ceramic.
Overall I would appreciate a lot a broadband NIR card (800-1700) without bleaching and the material to make one appears to exist. Poster:besembeson Posted Date:2016-03-24 01:54:42.0 Response from Bweh at Thorlabs USA: Thanks very much for your very valuable feedback. We are going to review our viewing card offerings. Poster:ryanh Posted Date:2016-02-22 04:21:17.59 Is the VRC6 detector card suitable for beam alignment of a 200W CO2 laser with a power density of approximately 200W/CM2 or will it damage the card? The laser will only be firing 1 pulse with an on time of around 50uS. Thanks. Poster:besembeson Posted Date:2016-03-03 02:05:37.0 Response from Bweh at Thorlabs USA: That laser power is significantly much higher than what we have tested the card with. These are generally not recommended for high power applications. I will contact you regarding testing this. Poster:drakem Posted Date:2016-02-17 15:40:48.323 It would be very helpful if the card's destructive threshold laser intensity were included. I burnt a hole in it the first time I used it. Poster:besembeson Posted Date:2016-03-03 01:31:27.0 Response from Bweh at Thorlabs USA. Thanks for your feedback. These are generally not recommended for high power applications. We will look into adding some notes on our website for recommended high power levels. I will contact you regarding your damaged card. Poster:yehonatan.gilead Posted Date:2015-05-21 13:07:12.287 Hello,
I can't seem to find the dimensions of the painted reticles. perhaps you could post the diameters of the small and large circles, as well as the length of the lines? Poster:jlow Posted Date:2015-05-21 11:36:15.0 Response from Jeremy at Thorlabs: The line width is around 0.004". The inner circle is about Ø0.063" and the outer circle is about Ø0.288". The length of the cross is about 0.512" (same for both vertical and horizontal lines) Poster:maxl Posted Date:2014-12-18 16:31:41.427 Can you offer IR Card Damage Threshold spec
Thanks for your help!
Looking forward to hearing from you soon! Poster:besembeson Posted Date:2014-12-18 04:25:58.0 Response from Bweh at Thorlabs: We don't have damage threshold specification yet for these. I will contact you by email to determine if this can still be suitable for you. Poster: Posted Date:2014-07-22 17:21:31.48 Can I cut one of these cards into a small piece that would fit my sample holder, or would that destroy it? Poster:Eddie.wu Posted Date:2014-07-14 16:38:22.857 Dear Sir:
our customer reply that this CRC6 card have something wrong, it can't recover the original state anymore.
Do you have any energy limitation to this card?
(they use 30W CW CO2 laser, setting to 17W, and the original beam size is 2.5mm, and the space between laser and alignment card is 2 meter)
please contact us as soon, thanks. Poster:jlow Posted Date:2014-08-01 02:55:07.0 Response from Jeremy at Thorlabs: The detector area is only green between around 25 to 30°C and it's brown or black otherwise. So please make sure that the temperature of your lab is around the right temperature range to get back to the green color. We do not have a damage threshold information on this for the moment but we will update the website with the damage threshold once we have the test data. Poster:egregorio Posted Date:2014-03-24 20:45:29.01 I have read in previous comments that the VRC4 has a minimum detectable power density for a pulsed laser of 250 kW/cm^2 peak @ 1064nm, 7ns, 10Hz. I have a pulsed laser at 1535 nm with 210 kW/cm^2 peak @ 1535 nm, 7 ns, 1 Hz, So, I am not sure if the VRC4 is sensitive enough. Do you know the sensitivity of this card for a pulsed laser at 1535 nm? Poster:jlow Posted Date:2014-03-26 11:36:56.0 Response from Jeremy at Thorlabs: The absorption at 1535nm would be lower than that at 1064nm (see spectral sensitivity graph on the webpage) so the minimum detectable power would be higher. Therefore, the VRC4 would probably not work for you. The VRC2 would probably work better for you. The min. stimulation is around 2kW/cm^2 peak power @ 1064nm. Adjusting it to 1535nm would be around 10kW/cm^2 or so. Poster:kedves Posted Date:2013-12-11 18:40:08.92 Dear Thorlabs,
Can your NIR Detector Card VRC4 be used with Ti:Sapphire laser beams? The absorption band seems to be appropriate, but how about the peak/average power density thresholds in the femtosecond pulse range? Are there any data or experiences? Secondly, I suppose that the surface of the photosensitive region is non-reflecting, is it correct? Thanks. Poster:tcohen Posted Date:2014-01-09 04:27:57.0 Response from Tim at Thorlabs: Thanks for your inquiry. The VRC4 has the appropriate absorption bands, but currently our data is only for CW and Pulsed: CW: Min <2uW/cm^2 at 808nm in dark. Min Pulsed: 250 kW/cm^2 peak @ 1064nm, 7ns, 10Hz, low ambient light. Max Pulsed: 35 MW/cm^2 peak @ 1064nm, 7ns, single pulse. Unfortunately this may not scale well to the fs regime. There is not a laminate over this coating but there will be some diffuse reflection. I’ve contacted you to organize some testing. Poster:lunaysol77 Posted Date:2013-11-28 13:33:51.477 Hello, I have a pulsed QCL in the range 6.71 to 8.73 microns with a maximum power of 300 mW, pulse width maximum of 500 ns, a pulse repetition rate of 100 KHz and a spot size of 2.5 mm. The VRC6-card serves to this laser?. Do you have any other recomendation to detect this laser? Thanks!! Poster:jlow Posted Date:2013-12-02 02:44:05.0 Response from Jeremy at Thorlabs: The VRC6 can be used to view the output from your QCL. Poster:jlow Posted Date:2014-08-01 11:09:06.0 Response from Jeremy at Thorlabs: These can be cut into smaller pieces. Poster:Erik.Schmidt Posted Date:2013-11-13 17:53:53.273 Hello, is the flourescent material on the VCR4-Card also available as a foil or as a paintable coating? Thx for reply! Poster:cdaly Posted Date:2013-11-14 04:01:26.0 Response from Chris at Thorlabs: Thank you for your inquiry, but unfortunately, we are not able to offer the viewing materials in this format. Poster:hambitza Posted Date:2013-05-13 11:27:33.783 My laser runs at 1080 nm. Does the flourescence of the VRC4D1 for 870 nm - 1070 nm "cut off" at 1070 nm or will it show some signal also 10 nm away at 1080 nm? Poster:jlow Posted Date:2013-05-15 11:13:00.0 Response from Jeremy at Thorlabs: The absorption does cut off at 1070nm. For 1080nm, I would recommend using the VRC2D1 instead. Poster:doug.newman Posted Date:2013-05-08 12:26:07.12 Product is currently in use. May order more. Question: are there any power-density threshold studies that have been done to note the maximum power/heat the cards may withstand before being damaged? Obviously this question has been asked before; just wondering if there are any updates?
Thank you.
doug Poster:jlow Posted Date:2013-05-14 09:27:00.0 Response from Jeremy at Thorlabs: We do not have the damage threshold spec at the moment. We are testing the damage threshold and we will update the webpage with the damage threshold spec once we are finished with the testing. Poster:bowen Posted Date:2013-02-28 11:07:27.38 Which card should I use for a 660-680nm source (your diode SLD1332V)? Thanks! Poster:cdaly Posted Date:2013-03-06 09:21:00.0 Response from Chris at Thorlabs: Thank you for using our web feedback. There's no card we recommend for this particular wavelength range. 660-680 nm is red light, which should be visible without the use of one of these. These are typically designed for use with UV or IR wavelengths. A few of these do have span wavelength in the visible, but these are always in addition to other non-visible ranges. Poster:jlow Posted Date:2012-10-22 16:33:00.0 Response from Jeremy at Thorlabs: The guideline value for the damage threshold for VRC2 is 60MW/cm^2 (peak power, for Nd:YAG laser @ 1064nm - single 7ns pulse). Unfortunately we do not have a damage threshold spec for CW. Poster:mlpgil Posted Date:2012-10-19 15:54:48.483 We need to use the VRC2 card, with a laser beam with 1064nm, and 30W of maximum power. We need to know what is the maximum power and energy density that could whitstands the VRC2 card.
Thank you, Poster:tcohen Posted Date:2012-03-29 11:12:00.0 Response from Tim at Thorlabs to Raffi: Thank you for your feedback! The VRC4 has a sharp cut on working range at 795nm whereas the VRC2 and VRC5 have some low absorption which is nonzero at 795nm. Therefore, at this wavelength it is difficult to see performance differences between the three. To clarify, we will update our website presentation to include graphs for future users to compare. If you have found that your VRC2/5 are working better for you and you have no need for the VRC4, we will fully refund your purchase. Poster:raphael.cohen3 Posted Date:2012-03-29 07:36:09.0 we use a 795nmn laser so we bought a VRC4, according to your graphs
but it is not as effective as VRC2 & 5 that we have
can you explain this?
Thanks
Raffi Poster:bdada Posted Date:2011-10-18 14:19:00.0 Response from Buki at Thorlabs:
Thank you for using our feedback tool. We will consider making the mounted version of the VRC4 available on our website. In the meantime, you could purchase the VRC4D1 alignment disk, which has the same wavelength band as the VRC4, and place it in a 1” mount like the LMR1 or a lens tube like the SM1L03. Please contact TechSupport@thorlabs.com if you have further questions. Poster:cbrideau Posted Date:2011-10-13 23:01:15.0 Could I get something like the VRC2SM1 threaded alignment disk, but using the VRC4 detector material instead? I find the VRC4 much easier to work with since it doesn't require room light charging. Poster:jjurado Posted Date:2011-03-23 13:54:00.0 Response from Javier at Thorlabs to dmitry_skvortsov: Thank you very much for contacting us with your request. For light detection at 1550 nm, we recommend using the VRC2 or VRC4 cards. I deem that the VRC4 would be the optimal solution for use at 1550 nm, since its absorption band is more pronounced than that of the VRC2. Also, the VRC4 requires no room light charging and the minimum incident power required is 100uw/cm^2 (@1550nm).
We currently do not have the specification for the minimum power required for the VRC2. I will look into this and get back to you. Poster:dmitry_skvortsov Posted Date:2011-03-17 18:42:44.0 Which card has the highest sensitivity for 1550nm?
What is the minimum cw laser power density needed to view the spot? Poster:Thorlabs Posted Date:2010-10-19 15:35:45.0 Response from Javier at Thorlabs to tkendall: The 830 nm output of your laser diode is close to one of the upper boundaries of the absorption bands of the VRC4, so the card is not very sensitive at this wavelength. We tested our IR viewing cards with an 830 nm laser diode, an the VRC4 actually requires a ~3.5 mW inout in order for one to be able to view the beam. On the other hand, the VRC2 and VRC4 clearly display the 830 nm beam at arounf 0.8 mW and 0.3 mW, respectively. So, I would recommend using the VRC5 card, although it is worth noting that this card needs to be constantly charged by room light. I will contact you directly in case you have additional questions. Poster:tkendall Posted Date:2010-10-18 20:11:52.0 Just purchased a VRC4 detector card. It does not display the IR radiation. The application is viewing the output of a 0.5mW output 830nm IR laser. Apparently this low output cant be detected. Is there something wrong or was the wrong detector card purchased? Poster:apalmentieri Posted Date:2010-03-01 15:22:10.0 A response from Adam at Thorlabs to fschewe: The text on the physical VRC2 card shown on our website is incorrect. The range is 400-640nm and we will correct this picture right away. If you recieved a card with the incorrect text, we can send a replacement card out to you. Poster:fschewe Posted Date:2010-02-26 15:01:24.0 On the VRC2 is written 400-540 nm but it is officially specified for 400-640 nm. What is right? Poster:klee Posted Date:2009-11-20 16:10:50.0 A response from Ken at thorlabs to traub: Unfortunately, we do not carry any viewing card for the Mid-IR range. I was unable to source this from other companies neither. Poster:traub Posted Date:2009-11-18 15:26:53.0 Hello, I search for a sensor card that works in the mid infrared (2-5 um).
I did not find such a card in your product catalog and/or website.
Can you help me finding such MIR sensor cards?
Thanks in advance,
Tobias Poster:Laurie Posted Date:2009-04-21 16:55:14.0 Response from Laurie at Thorlabs to smarka: Thank you for your interest in our products. We can provide the VRC4 with the requested dimensions. To provide a quote, we will need some additional information. Someone from our technical support staff will contact you directly. Poster:smarka Posted Date:2009-04-20 11:43:10.0 I would like to know whether it would be possible to have VDIR (or VRC4) coated material available in larger sheets. 4"x4" or 10"x10" would be extremely useful.
Thank you! Poster:Tyler Posted Date:2008-11-03 16:58:13.0 A response from Tyler at Thorlabs to aren100won: I will contact you via email in case you had trouble with our feedback form. Poster:Tyler Posted Date:2008-11-03 16:56:42.0 A response from Tyler at Thorlabs to Antonio_Oliver: I will forward this question to our technical support department who will then contact you. Thank you for considering us for this request. We always appreciate hearing about what the research community needs and Thorlabs is dedicated to fulfilling those needs whenever possible. Poster:aren100won Posted Date:2008-11-03 02:44:02.0 sdfsdf Poster:Antonio_Oliver Posted Date:2008-10-22 08:39:52.0 I would like to be able to purchase a large 30cm by 30cm detection "sheet." For our application, we often have to locate and align an array of multiple beams at once. Is it possible to get a custom product like what I have described above?
Antonio Poster:TechnicalMarketing Posted Date:2007-11-19 11:24:16.0 Dear acable,
Thank you for your excellent suggestions. The active area of the VC-1550, VC-VIS/IR, and VC-UV viewing cards has been extended to the edge of the card and the back of the card behind the active region no longer has black ink on it so that in certain conditions the spot can be seen through the card. Your request for adding the absorption curves to the back of the card has been forwarded to a design engineer and will hopefully be implemented in the future. Poster:acable Posted Date:2007-11-10 14:20:23.0 It would be good to extend the active area right to the end of the card. Also the back side of the card should be white, with the room lights out i can typically see a spot thru the card after i scrap off the black ink.
It would also be good to have separate price boxes for each of the cards, with a photo of the card and the corresponding response curve.
Not sure if the response curve is printed on the back of the VC-series cards but if not i would suggest adding it. |
Zoom- Does Not Require Charging
- Two Engraved Reticles for Use in Beam Collimation
- Wavelength Range Printed on Card
- Overall Dimensions (W x H): 2.10" x 3.40" (53.3 mm x 86.4 mm)
The VRC1 is a credit-card-sized detector card for viewing light in the 250 - 540 nm range. This card is made from a durable plastic and has a photosensitive region adhered to the front surface that allows for the easy location of an UV light beam and its focal point. Since the active region does not require charging, the emission is persistent even when used in CW applications in a darkened room.
To facilitate the use of the card during alignment procedures, the detection region extends all the way to the edge of the card and includes two engraved reticles for use in laser beam collimation. These reticles, formed from lines that are about 0.004" (0.10 mm) wide, feature two concentric circles that have diameters of approximately 0.063" (1.60 mm) and 0.288" (7.31 mm) with horizontal and vertical lines that are approximately 0.512" (13.00 mm) long. In addition, when the card is used in a darkened room with a sufficiently bright source, the fluorescence from the activated photosensitive region can be seen through the back of the card or the photosensitive region can be activated by illuminating the back of the card. This is especially useful for aligning the overlap of two beams.
| Item # | Absorption Band | Emission Band | Sensitivity Graph | Active Region Dimensions | Dimensions | Charging Required |
|---|---|---|---|---|---|---|
| VRC1 | 250 - 540 nm | ~450 - 750 nm |  |
1.20" x 2.10" (30.5 mm x 53.3 mm) |  |
No |
Zoom- Requires Charging by Visible Light
- Two Engraved Reticles for Use in Beam Collimation
- Wavelength Range Printed on Card
- Overall Dimensions (W x H): 2.10" x 3.40" (53.3 mm x 86.4 mm)
The VRC2 is a credit-card-sized detector card for viewing light in the 400 to 640 nm or the 800 to 1700 nm range. This card is made from a durable plastic and has a photosensitive region adhered to the front surface that allows for the easy location of a visible or near-infrared (NIR) light beam and its focal point. Proper function of this card requires charging it with visible light before use. Additionally, because emissions from the card are not persistent, the user must move the card around for optimal brightness of the beam spot.
To facilitate the use of the card during alignment procedures, the detection region extends all the way to the edge of the card and includes two engraved reticles for use in laser beam collimation. These reticles, formed from lines that are about 0.004" (0.10 mm) wide, feature two concentric circles that have diameters of approximately 0.063" (1.60 mm) and 0.288" (7.31 mm) with horizontal and vertical lines that are approximately 0.512" (13.00 mm) long.
| Item # | Absorption Bands | Emission Band | Sensitivity Graph | Active Region Dimensions | Dimensions | Charging Required |
|---|---|---|---|---|---|---|
| VRC2 | 400 - 640 nm and 800 - 1700 nm | ~580 - 750 nm |  |
1.20" x 2.10" (30.5 mm x 53.3 mm) |  |
Yes |
Zoom- Requires Charging by Visible Light
- Sensitivity Curve Printed on Card
- Overall Dimensions (W x H): 1.75" x 2.50" (44.5 mm x 63.5 mm)
Measuring 1.75" x 2.50" (44.5 mm x 63.5 mm), the VRC5 is designed for viewing light in the 700 to 1400 nm range. This card requires charging by visible light for proper function. The photosensitive area measures 0.75" x 1.5" (19.1 mm x 38.1 mm) and is encapsulated between two layers of durable clear plastic.
| Item # | Absorption Band | Emission Band | Sensitivity Graph | Active Region Dimensions | Dimensions | Charging Required |
|---|---|---|---|---|---|---|
| VRC5 | 700 - 1400 nm | Visible |  |
0.75" x 1.5" (19.1 mm x 38.1 mm) |
 |
Yes |
Zoom- Does Not Require Charging by Visible Light
- Two Engraved Reticles for Use in Beam Collimation
- Wavelength Range Printed on Card
- Overall Dimensions (W x H): 2.10" x 3.40" (53.3 mm x 86.4 mm)
The VRC4 is a credit-card-sized detector card for viewing light in the 790 to 840 nm, 870 to 1070 nm, and 1500 to 1590 nm ranges. This card is made from a durable plastic and has a photosensitive region adhered to the front surface that allows for the easy location of a near-infrared (NIR) light beam and its focal point. Since the active region does not require charging, the emission is persistent even when used in CW applications in a darkened room.
To facilitate the use of the card during alignment procedures, the detection region extends all the way to the edge of the card and includes two engraved reticles for use in laser beam collimation. These reticles, formed from lines that are about 0.004" (0.10 mm) wide, feature two concentric circles that have diameters of approximately 0.063" (1.60 mm) and 0.288" (7.31 mm) with horizontal and vertical lines that are approximately 0.512" (13.00 mm) long. In addition, when the card is used in a darkened room with a sufficiently bright source, the fluorescence from the activated photosensitive region can be seen through the back of the card or the photosensitive region can be activated by illuminating the back of the card. This is especially useful for aligning the overlap of two beams.
| Item # | Absorption Bands | Emission Band | Sensitivity Graph | Active Region Dimensions | Dimensions | Charging Required |
|---|---|---|---|---|---|---|
| VRC4 | 790 - 840 nm, 870 - 1070 nm, and 1500 - 1590 nm |
~520 - 580 nm |  |
1.20" x 2.10" (30.5 mm x 53.3 mm) |  |
No |
Zoom
Ø0.5 mm Spot at 0.3 W/cm2
Ø1.0 mm Spot at 2.0 W/cm2
Click to Enlarge
The VRC6 detector area is green between 25 and 30 °C and is black or brown at other temperatures.
- Liquid Crystal Film Changes Color When Exposed to Mid-IR (MIR) Light
- Active Area: 2.13" x 1.20" (54.0 mm x 30.5 mm)
- Minimum Detectable Power Density: 0.3 W/cm2 @ 1550 nm
- Recovery Time: <1 Second
- Overall Dimensions (W x H): 2.13" x 3.37" (54.0 mm x 85.7 mm)
The VRC6 MIR laser viewing card has been tested to work with wavelengths from 1.5 µm to at least 13.2 µm. The detector area on this card is a thin layer of liquid crystal that has been printed onto the black metal card. Thermochromic liquid crystals are temperature-sensitive organic chemicals with twisted helical molecular structures. MIR light changes the temperature of the detector area, resulting in a color change. The detector area is green between 25 and 30 °C, and it is black or brown otherwise. Simply tap the card on a tabletop to return the color to the resting state.
The detection region extends all the way to the edge of the card in order to facilitate the use of the card during alignment procedures, and each card features two engraved reticles for use in laser beam collimation.
Please Note: The spot size on the card will vary depending on beam power. The photos to the right demonstrate the spot size on the card at the minimum detected power density, 0.3 W/cm2, and at 2.0 W/cm2. The engraved reticles are also visible in these photos. Please see the Graphs tab for more photos and details on the spot size variation.
Laser Viewing Cards | ||
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