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UV Fused Silica Plano-Convex Lenses, AR Coated: 350 - 700 nm


  • AR Coating for 350 - 700 nm Deposited on UV-Grade Fused Silica Substrate
  • Near Best Form for Infinite Conjugate Applications
  • Focuses Incident Collimated Light

LA4052-A

LA4647-A

LA4052-A

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Common Specifications
Lens Shape Plano / Convex
Substrate Material UV Grade Fused Silicaa
AR Coating Range 350 - 700 nm
Reflectance Over Coating
Range (AOI = 0°)
Ravg <0.5%
Diameters Available 1/2" and 1"
Diameter Tolerance +0.00 mm / -0.10 mm
Thickness Tolerance ±0.1 mm
Clear Aperture Ø1/2" Lenses: >Ø11.05 mm
Ø1" Lenses: >Ø22.86 mm
Design Wavelength 587.6 nm
Index of Refraction (@ 588 nm) 1.460
Surface Quality 40-20 Scratch-Dig
Surface Flatness
(Plano Side)
λ/2
Spherical Surface Power
(Concave Side)b
3λ/2
Surface Irregularity
(Peak to Valley)
λ/4
Centration <3 arcmin
Focal Length Tolerance ±1%
Damage
Threshold
Pulse 7.5 J/cm2
(532 nm, 10 ns, 10 Hz, Ø0.491 mm)
CWc >2.3 kW/cm (532 nm, Ø1.000 mm)
  • Click Link for Detailed Specifications on the Substrate
  • Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.
  • Refer to the Damage Thresholds Tab for Details
UVFS Plano-Convex Lens Selection Guide
AR Coating Range Lenses
Uncoated Unmounted, Mounted
245 - 400 nm Unmounted, Mounted
350 - 700 nm Unmounted, Mounted
650 - 1050 nm Unmounted, Mounted
1050 - 1700 nm Unmounted, Mounted
532/1064 nm Unmounted, Mounted

Custom Coatings are also available. Please contact Tech Support for a quote.

Features

  • Ø1/2" and Ø1" Available
  • AR Coating for the 350 - 700 nm Range
  • Fabricated from UV Grade Fused Silica
  • Focal Lengths Available from 20.0 - 500.0 mm

These UV Grade Fused Silica Plano-Convex lenses, which are available in Ø1/2" and Ø1" sizes, have an AR coating for the 350 - 700 nm range deposited on both surfaces. UV-grade fused silica offers high transmission in the deep UV and exhibits virtually no laser-induced fluorescence (as measured at 193 nm), making it an ideal choice for applications from the UV to the near IR. In addition, UV fused silica has better homogeneity and a lower coefficient of thermal expansion than N-BK7.

The additional AR coating on these plano-convex lenses is particularly desirable for applications with multiple optical elements. Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of a AR coating improves transmission, which is particularly important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections.

Plano-convex lenses have positive focal lengths and are the most popular type of lens element. They are commonly used to focus a collimated incident beam; in such cases the collimated light source should be incident on the curved surface to minimize spherical aberrations. When image quality is not critical, plano-convex lenses can also be used as a substitute for achromatic doublets.

Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.

When deciding between a plano-convex lens and a bi-convex lens, both of which cause collimated incident light to converge, it is usually preferable to choose a plano-convex lens if the desired absolute magnification is either less than 0.2 or greater than 5. Between these two values, bi-convex lenses are generally preferred.

These lenses are compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.

UV Fused Silica lens kits are also available. Please click here for information.

Optic Cleaning Tutorial
Optical Coatings and Substrates
Lens Tutorial
Quick Links to Other Spherical Singlets
Plano-Convex Bi-Convex Best Form Plano-Concave Bi-Concave Positive Meniscus Negative Meniscus

This high-performance multilayer AR coating has an average reflectance of less than 0.5% (per surface) across the specified wavelength range and provides good performance for angles of incidence (AOI) between 0° and 30°. Detailed AR coating curves are shown below for the -A coating on the lenses sold on this page.

For optics intended to be used at larger incident angles, consider ordering a custom coating optimized for a 45° angle of incidence; this coating is recommended for use with incidence angles from 25° to 52°. For more information, please contact Tech Support.

UV Fused Silica Plano-Convex lenses are also available uncoated, with a YAG AR V-Coating (532/1064 nm), or with -UV (245 - 400 nm), -B (650 - 1050 nm), and -C (1050 -1700 nm) Broadband AR coatings.

A AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance.
UVFS Transmission
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Click Here for Raw Data
This transmission curve is for a 10 mm thick uncoated sample of UV fused silica when the incident light is normal to the surface. Please note that this is the measured transmission, including surface reflections.

Thorlabs' Standard Broadband Antireflection Coatings

Damage Threshold Specifications
Coating Designation
(Item # Suffix)
Damage Threshold
-A Pulse 7.5 J/cm2 at 532 nm, 10 ns, 10 Hz, Ø0.491 mm
CWa,b >2.3 kW/cm (532 nm, Ø1.000 mm)
  • The power density of your beam should be calculated in terms of W/cm. For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see the "Continuous Wave and Long-Pulse Lasers" section below.
  • The stated damage threshold is a certification measurement, as opposed to a true damage threshold (i.e., the optic was able to withstand the maximum output of the laser with no damage).

Damage Threshold Data for Thorlabs' UV Fused Silica Lenses

The specifications to the right are measured data for Thorlabs' -A AR-coated UV fused silica lenses. Damage threshold specifications are constant for a given coating type, regardless of the size of the window.

 

Laser Induced Damage Threshold Tutorial

The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS11254 and ISO 21254 specifications.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for 30 seconds (CW) or for a number of pulses (pulse repetition frequency specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence # of Tested Locations Locations with Damage Locations Without Damage
1.50 J/cm2 10 0 10
1.75 J/cm2 10 0 10
2.00 J/cm2 10 0 10
2.25 J/cm2 10 1 9
3.00 J/cm2 10 1 9
5.00 J/cm2 10 9 1

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions.

When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Beam diameter of your beam (1/e2)
  3. Approximate intensity profile of your beam (e.g., Gaussian)
  4. Linear power density of your beam (total power divided by 1/e2 beam diameter)

Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. Average linear power density can be calculated using the equation below. 

The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm):

CW Wavelength Scaling

While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. 

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Duration t < 10-9 s 10-9 < t < 10-7 s 10-7 < t < 10-4 s t > 10-4 s
Damage Mechanism Avalanche Ionization Dielectric Breakdown Dielectric Breakdown or Thermal Thermal
Relevant Damage Specification No Comparison (See Above) Pulsed Pulsed and CW CW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1998).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

In order to illustrate the process of determining whether a given laser system will damage an optic, a number of example calculations of laser induced damage threshold are given below. For assistance with performing similar calculations, we provide a spreadsheet calculator that can be downloaded by clicking the button to the right. To use the calculator, enter the specified LIDT value of the optic under consideration and the relevant parameters of your laser system in the green boxes. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. These values are used to calculate adjusted, scaled LIDT values for the optics based on accepted scaling laws. This calculator assumes a Gaussian beam profile, so a correction factor must be introduced for other beam shapes (uniform, etc.). The LIDT scaling laws are determined from empirical relationships; their accuracy is not guaranteed. Remember that absorption by optics or coatings can significantly reduce LIDT in some spectral regions. These LIDT values are not valid for ultrashort pulses less than one nanosecond in duration.

Intensity Distribution
A Gaussian beam profile has about twice the maximum intensity of a uniform beam profile.

CW Laser Example
Suppose that a CW laser system at 1319 nm produces a 0.5 W Gaussian beam that has a 1/e2 diameter of 10 mm. A naive calculation of the average linear power density of this beam would yield a value of 0.5 W/cm, given by the total power divided by the beam diameter:

CW Wavelength Scaling

However, the maximum power density of a Gaussian beam is about twice the maximum power density of a uniform beam, as shown in the graph to the right. Therefore, a more accurate determination of the maximum linear power density of the system is 1 W/cm.

An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. CW damage threshold values typically scale directly with the wavelength of the laser source, so this yields an adjusted LIDT value:

CW Wavelength Scaling

The adjusted LIDT value of 350 W/cm x (1319 nm / 1550 nm) = 298 W/cm is significantly higher than the calculated maximum linear power density of the laser system, so it would be safe to use this doublet lens for this application.

Pulsed Nanosecond Laser Example: Scaling for Different Pulse Durations
Suppose that a pulsed Nd:YAG laser system is frequency tripled to produce a 10 Hz output, consisting of 2 ns output pulses at 355 nm, each with 1 J of energy, in a Gaussian beam with a 1.9 cm beam diameter (1/e2). The average energy density of each pulse is found by dividing the pulse energy by the beam area:

Pulse Energy Density

As described above, the maximum energy density of a Gaussian beam is about twice the average energy density. So, the maximum energy density of this beam is ~0.7 J/cm2.

The energy density of the beam can be compared to the LIDT values of 1 J/cm2 and 3.5 J/cm2 for a BB1-E01 broadband dielectric mirror and an NB1-K08 Nd:YAG laser line mirror, respectively. Both of these LIDT values, while measured at 355 nm, were determined with a 10 ns pulsed laser at 10 Hz. Therefore, an adjustment must be applied for the shorter pulse duration of the system under consideration. As described on the previous tab, LIDT values in the nanosecond pulse regime scale with the square root of the laser pulse duration:

Pulse Length Scaling

This adjustment factor results in LIDT values of 0.45 J/cm2 for the BB1-E01 broadband mirror and 1.6 J/cm2 for the Nd:YAG laser line mirror, which are to be compared with the 0.7 J/cm2 maximum energy density of the beam. While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system.

Pulsed Nanosecond Laser Example: Scaling for Different Wavelengths
Suppose that a pulsed laser system emits 10 ns pulses at 2.5 Hz, each with 100 mJ of energy at 1064 nm in a 16 mm diameter beam (1/e2) that must be attenuated with a neutral density filter. For a Gaussian output, these specifications result in a maximum energy density of 0.1 J/cm2. The damage threshold of an NDUV10A Ø25 mm, OD 1.0, reflective neutral density filter is 0.05 J/cm2 for 10 ns pulses at 355 nm, while the damage threshold of the similar NE10A absorptive filter is 10 J/cm2 for 10 ns pulses at 532 nm. As described on the previous tab, the LIDT value of an optic scales with the square root of the wavelength in the nanosecond pulse regime:

Pulse Wavelength Scaling

This scaling gives adjusted LIDT values of 0.08 J/cm2 for the reflective filter and 14 J/cm2 for the absorptive filter. In this case, the absorptive filter is the best choice in order to avoid optical damage.

Pulsed Microsecond Laser Example
Consider a laser system that produces 1 µs pulses, each containing 150 µJ of energy at a repetition rate of 50 kHz, resulting in a relatively high duty cycle of 5%. This system falls somewhere between the regimes of CW and pulsed laser induced damage, and could potentially damage an optic by mechanisms associated with either regime. As a result, both CW and pulsed LIDT values must be compared to the properties of the laser system to ensure safe operation.

If this relatively long-pulse laser emits a Gaussian 12.7 mm diameter beam (1/e2) at 980 nm, then the resulting output has a linear power density of 5.9 W/cm and an energy density of 1.2 x 10-4 J/cm2 per pulse. This can be compared to the LIDT values for a WPQ10E-980 polymer zero-order quarter-wave plate, which are 5 W/cm for CW radiation at 810 nm and 5 J/cm2 for a 10 ns pulse at 810 nm. As before, the CW LIDT of the optic scales linearly with the laser wavelength, resulting in an adjusted CW value of 6 W/cm at 980 nm. On the other hand, the pulsed LIDT scales with the square root of the laser wavelength and the square root of the pulse duration, resulting in an adjusted value of 55 J/cm2 for a 1 µs pulse at 980 nm. The pulsed LIDT of the optic is significantly greater than the energy density of the laser pulse, so individual pulses will not damage the wave plate. However, the large average linear power density of the laser system may cause thermal damage to the optic, much like a high-power CW beam.

CXY1 in 30 mm Cage System
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CXY1 Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System
Threaded Mounting Adapter
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Ø1" Optic Mounted in a
ST1XY-S XY Translator

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LMR1 Fixed Mount with Ø1" Lens

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LM2XY Translating Mount with Ø2" Lens
Recommended Mounting Options for Thorlabs Lenses
Item # Mounts for Ø5 mm to Ø10 mm Optics
Imperial Metric
(Various) Fixed Lens Mounts for Small Optics, Ø5 mm to Ø10 mm
(Various) Small Optic Adapters for Use with Standard Fixed Lens Mounts, Ø5 mm to Ø10 mm
Item # Mounts for Ø1/2" (Ø12.7 mm) Optics
Imperial Metric
LMR05 LMR05/M Fixed Lens Mount for Ø1/2" Optics
LM05XY LM05XY/M Translating Lens Mount for Ø1/2" Optics
SCP05 16 mm Cage System, XY Translation Mount for Ø1/2" Optics
(Various) Ø1/2" Lens Tubes,
Optional SM05RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Mounts for Ø1" (Ø25.4 mm) Optics
Imperial Metric
LMR1 LMR1/M Fixed Lens Mount for Ø1" Optics
LM1XY LM1XY/M Translating Lens Mount for Ø1" Optics
ST1XY-S ST1XY-S/M Translating Lens Mount with Micrometer Drives (Other Drives Available)
CXY1 30 mm Cage System, XY Translation Mount for Ø1" Optics
(Various) Ø1" Lens Tubes,
Optional SM1RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Mounts for Ø2" (Ø50.8 mm) Optics
Imperial Metric
LMR2 LMR2/M Fixed Lens Mount for Ø2" Optics
LM2XY LM2XY/M Translating Lens Mount for Ø2" Optics
CXY2 60 mm Cage System, XY Translation Mount for Ø2" Optics
(Various) Ø2" Lens Tubes,
Optional SM2RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Adjustable Optic Mounts
Imperial Metric
LH1 LH1/M Adjustable Mount for Ø0.28" (Ø7.1 mm) to Ø1.80" (Ø45.7 mm) Optics
LH2 LH2/M Adjustable Mount for Ø0.77" (Ø19.6 mm) to Ø2.28" (Ø57.9 mm) Optics
VG100 VG100/M Adjustable Clamp for Ø0.5" (Ø13 mm) to Ø3.5" (Ø89 mm) Optics
SCL03 SCL03/M Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics
SCL04 SCL04/M Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø3.00" (Ø76.2 mm) Optics
LH160C LH160C/M Adjustable Mount for 60 mm Cage Systems,
Ø0.50" (Ø13 mm) to Ø2.00" (Ø50.8 mm) Optics
SCL60C SCL60C/M Self-Centering Mount for 60 mm Cage Systems,
Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics

 

Mounting High-Curvature Optics

Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.

Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.


Posted Comments:
dpais  (posted 2017-08-11 17:25:14.173)
Greetings, I have looked through your website, but I am not sure if your products fit my purppose. So I would like to get a custom quote for a plano convex lens: Material: fused silica; focal length: 14.076mm Diameter 10.5mm Working range: 200-700 nm. Alternatively, 230 to 600nm. Quantity: One or two lenses I want to measure fluorescence using this lens. Both emission and excitation light will go through the lens. What is the best coating for this application? Is there a type of coating that covers the range I will be using? Can I have a quote for coated and not coated lens? Best regards, Daniel Pais
tfrisch  (posted 2017-09-06 03:30:32.0)
Hello, thank you for contacting Thorlabs. We would not be able to offer a lens with such a tight focal length tolerance, but I will reach out to you about your application to see if we can provide something that would be suitable for you.
matthieu.viteau  (posted 2015-10-16 18:51:36.43)
Do you know the damage thresold for this lenses ? specially in pulsed mode with a laser around 515nm and 10ps ?
besembeson  (posted 2015-10-28 09:16:31.0)
Response from Bweh at Thorlabs USA: For pulses in the ns regime, it will be 7.5 J/cm^2 at 532 nm (tested under 10 ns, 10 Hz, Ø0.491 mm). However, this will not apply with much reliability to pulses in the ps regime, as avalanche ionization becomes the dominant damage mechanism. Such ultra-short pulses may not heat up the optic enough to cause thermal damage but produce strong electric fields capable of dielectric breakdown.

Ø1/2" UV Fused Silica Plano-Convex Lenses, AR Coated: 350 - 700 nm

Item #a Diameter Focal Length Diopterb Radius of Curvature Center Thickness Edge Thicknessc Back Focal Length Reference
Drawing
LA4647-A 1/2" 20.1 mm +49.8 9.2 mm 4.3 mm 1.8 mm 17.1 mm Plano-Convex Lens Drawing
  • Suggested Fixed Lens Mounts: LMR05(/M)
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA4647-A Support Documentation
LA4647-ACustomer Inspired! f=20 mm, Ø1/2" UVFS Plano Convex-Lens, ARC: 350 - 700 nm
$101.49
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Ø1" UV Fused Silica Plano-Convex Lenses, AR-Coated: 350 - 700 nm

Item #a Diameter Focal Length Diopterb Radius of Curvature Center Thickness Edge Thicknessc Back Focal Length Reference
Drawing
LA4052-A 1" 35.1 mm +28.5 16.1 mm 8.2 mm 1.9 mm 29.5 mm Plano-Convex Lens Drawing
LA4306-A 1" 40.1 mm +24.9 18.4 mm 7.1 mm 2.0 mm 35.3 mm
LA4148-A 1" 50.2 mm +19.9 23.0 mm 5.8 mm 2.0 mm 46.2 mm
LA4725-A 1" 75.3 mm +13.3 34.5 mm 4.4 mm 2.0 mm 72.2 mm
LA4380-A 1" 100.3 mm +10.0 46.0 mm 3.8 mm 2.0 mm 97.7 mm
LA4874-A 1" 150.5 mm +6.6 69.0 mm 3.2 mm 2.0 mm 148.4 mm
LA4924-A 1" 175.6 mm +6.0 80.5 mm 3.0 mm 2.0 mm 173.6 mm
LA4102-A 1" 200.7 mm +5.0 92.0 mm 2.9 mm 2.0 mm 198.7 mm
LA4158-A 1" 250.9 mm +4.0 115.0 mm 2.7 mm 2.0 mm 249.0 mm
LA4579-A 1" 301.1 mm +3.3 138.0 mm 2.6 mm 2.0 mm 299.3 mm
LA4184-A 1" 501.8 mm +2.0 230.0 mm 2.4 mm 2.0 mm 500.2 mm
  • Suggested Fixed Lens Mounts: LMR1(/M)
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA4052-A Support Documentation
LA4052-ACustomer Inspired! f=35 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$113.22
Today
LA4306-A Support Documentation
LA4306-ACustomer Inspired! f=40 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$113.22
Today
LA4148-A Support Documentation
LA4148-ACustomer Inspired! f=50 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$116.28
Today
LA4725-A Support Documentation
LA4725-ACustomer Inspired! f=75 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$108.12
Today
LA4380-A Support Documentation
LA4380-ACustomer Inspired! f=100 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$106.08
Today
LA4874-A Support Documentation
LA4874-ACustomer Inspired! f=150mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$99.45
3-5 Days
LA4924-A Support Documentation
LA4924-ACustomer Inspired! f=175 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$97.16
Today
LA4102-A Support Documentation
LA4102-ACustomer Inspired! f=200 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$102.00
Today
LA4158-A Support Documentation
LA4158-ACustomer Inspired! f=250 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$109.14
Today
LA4579-A Support Documentation
LA4579-ACustomer Inspired! f=300 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$99.71
Today
LA4184-A Support Documentation
LA4184-ACustomer Inspired! f=500 mm, Ø1" UVFS Plano-Convex Lens, ARC: 350 - 700 nm
$109.14
Today
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