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Plano-Convex Round Cylindrical Lenses, CaF2, Mounted


  • Focus Light Along a Single Axis
  • Ø1/2" or Ø1" Engraved Mount
  • Focal Length Options from 20 to 200 mm
  • Uncoated or AR Coated for 1.65 - 3.0 µm or 2 - 5 µm

LJ5386RM

LJ5654RM

LJ5440RM-D

LJ5709RM-E

Related Items


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Common Specificationsa
Substrate Calcium Fluoride (CaF2)b
Design Wavelength 4 µm
Focal Length Tolerance ±1%
Surface Quality 40-20 Scratch-Dig
Centration <5 arcmin
Surface Flatness (Plano Side) λ/2
Cylindrical Surface Powerc (Convex Side) 3λ/2
  • Please see the tables below for item-specific specifications.
  • Click Link for Detailed Specifications on the Substrate
  • Much like surface flatness for flat optics, surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge. This specification is also commonly referred to as surface fit.
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.
Optical Coatings and Substrates
Optic Cleaning Tutorial

Features

  • Calcium Fluoride (CaF2) Substrate for 180 nm - 8.0 µm
  • Available Uncoated or with Broadband AR Coating for 1.65 - 3.0 µm or 2 - 5 µm
  • Mounted in Ø1/2" or Ø1" Housing with Focal Length Engraving
  • Seven Focal Lengths from 20 mm to 200 mm
  • Bring Collimated Light to a Line Focus
  • Useful for Correcting Astigmatism

Thorlabs' Mounted Plano-Convex Round Cylindrical Lenses focus or collimate light along a single axis. The lenses sold on this page are fabricated from a calcium fluoride (CaF2) substrate that provides high transmission throughout the mid-IR spectral region, as shown in the Graphs tab. They are available with focal lengths ranging from 20 mm to 200 mm and can be ordered uncoated or with a broadband antireflection (AR) coating. The broadband AR coatings provide <1% average reflectance (per surface) over the 1.65 - 3.0 µm wavelength range or <1.25% average reflectance (per surface) over the 2 - 5 µm wavelength range.

Unlike typical cylindrical lenses, which are rectangular, these cylindrical lenses are packaged in round, black anodized aluminum housings, as shown by the image at the top of the page. Each housing is engraved with the Item # and focal length of the lens; the housings can be secured by retaining rings into standard optic mounts and rotation mounts, as well as either Ø1/2" or Ø1" lens tubes. Since they only focus light along one dimension, they can be used in pairs to anamorphically shape images or correct for astigmatism. This property makes them particularly useful for Mid-IR Quantum Cascade Lasers (QCLs) and Interband Cascade Lasers (ICLs), which have strongly differing beam divergence angles along the parallel and perpendicular axes.

CaF2 is commonly used for applications requiring high transmission from the ultraviolet to the mid-IR spectral range. The material possesses a low refractive index that varies from 1.51 to 1.35 within its usage range of 180 nm to 8.0 μm. Calcium fluoride is also fairly chemically inert and offers superior hardness compared to its barium fluoride, magnesium fluoride, and lithium fluoride cousins. For additional details on calcium fluoride, please see our Optical Substrates presentation.

To minimize the introduction of spherical aberrations, light should be bent gradually as it propagates through the lens. Therefore, when using a plano-convex lens to focus a collimated beam, the collimated light should be incident on the curved surface. Similarly, when collimating a point source, the diverging light rays should be incident on the planar surface of the lens.

Transmission of Uncoated Calcium Fluoride
Click to Enlarge

Click Here for Raw Data
This plot shows the total measured transmission through an uncoated, 10 mm thick CaF2 sample.
Transmission of Uncoated Calcium Fluoride
Click to Enlarge

This plot shows the theoretical reflectance (per surface) of our 1.65 - 3.0 µm AR-coated CaF2 cylindrical lenses. The shaded region denotes the AR coating range. Over this range, the average reflectance is <1%.
Transmission of Uncoated Calcium Fluoride
Click to Enlarge

Click Here for Raw Data from 1.0 to 5.5 µm
This plot shows the measured reflectance (per surface) of our 2 - 5 µm AR-coated CaF2 cylindrical lenses. The shaded region denotes the AR coating range. Over this range, the average reflectance is <1.25%.
Beam Circularization Setup
Click to Enlarge

 Figure 1: The beam circularization systems were placed in the area of the experimental setup highlighted by the yellow rectangle.
Spatial Filter Setup
Click to Enlarge

Figure 4: Spatial Filter System
Anamorphic Prism Pair Setup
Click to Enlarge

Figure 3: Anamorphic Prism Pair System
Cylindrical Lens Pair Setup
Click to Enlarge

Figure 2: Cylindrical Lens Pair System

Comparison of Circularization Techniques for Elliptical Beams

Edge-emitting laser diodes emit elliptical beams as a consequence of the rectangular cross sections of their emission apertures. The component of the beam corresponding to the narrower dimension of the aperture has a greater divergence angle than the orthogonal beam component. As one component diverges more rapidly than the other, the beam shape is elliptical rather than circular. 

Elliptical beam shapes can be undesirable, as the spot size of the focused beam is larger than if the beam were circular, and as larger spot sizes have lower irradiances (power per area). Techniques for circularizing an elliptical beam include those based on a pair of cylindrical lenses, an anamorphic prism pair, or a spatial filter. This work investigated all three approaches. The characteristics of the circularized beams were evaluated by performing M2 measurements, wavefront measurements, and measuring the transmitted power. 

While it was demonstrated that each circularization technique improves the circularity of the elliptical input beam, each technique was shown to provide a different balance of circularization, beam quality, and transmitted power. The results of this work, which are documented in this Lab Fact, indicate that an application's specific requirements will determine which is the best circularization technique to choose.

Experimental Design and Setup

The experimental setup is shown in Figure 1. The elliptically-shaped, collimated beam of a temperature-stabilized 670 nm laser diode was input to each of our circularization systems shown in Figures 2 through 4. Collimation results in a low-divergence beam, but it does not affect the beam shape. Each system was based on one of the following:

  • LJ1874L2-A and LJ1638L1-A Plano-Convex Convex Cylindrical Lenses (Figure 2)
  • PS873-A Unmounted Anamorphic Prism Pair (Figure 3)
  • KT310 Spatial Filter System with P5S Ø5 µm Pinhole (Figure 4)

The beam circularization systems, shown to the right, were placed, one at a time, in the vacant spot in the setup highlighted by the yellow rectangle. With this arrangement, it was possible to use the same experimental conditions when evaluating each circularization technique, which allowed the performance of each to be directly compared with the others. This experimental constraint required the use of fixturing that was not optimally compact, as well as the use of an unmounted anamorphic prism pair, instead of a more convenient mounted and pre-aligned anamorphic prism pair.

The characteristics of the beams output by the different circularization systems were evaluated by making measurements using a power meter, a wavefront sensor, and an M2 system. In the image of the experimental setup, all of these systems are shown on the right side of the table for illustrative purposes; they were used one at a time. The power meter was used to determine how much the beam circularization system attenuated the intensity of the input laser beam. The wavefront sensor provided a way to measure the abberations of the output beam. The M2 system measurement describes the resemblence of the output beam to a Gaussian beam. Ideally, the circularization systems would not attenuate or abberate the laser beam, and they would output a perfectly Gaussian beam. 

Edge-emitting laser diodes also emit astigmatic beams, and it can be desirable to force the displaced focal points of the orthogonal beam components to overlap. Of the three circularization techniques investigated in this work, only the cylindrical lens pair can also compensate for astigmatism. The displacement between the focal spots of the orthogonal beam components were measured for each circularization technique. In the case of the cylindrical lens pair, their configuration was tuned to minimize the astigmatism in the laser beam. The astigmatism was reported as a normalized quantity.

Experimental Results

The experimental results are summarized in the following table, in which the green cells identify the best result in each category. Each circularization approach has its benefits. The best circularization technique for an application is determined by the system’s requirements for beam quality, transmitted optical power, and setup constraints. 

Spatial filtering significantly improved the circularity and quality of the beam, but the beam had low transmitted power. The cylindrical lens pair provided a well-circularized beam and balanced circularization and beam quality with transmitted power. In addition, the cylindrical lens pair compensated for much of the beam's astigmatism. The circularity of the beam provided by the anamorphic prism pair compared well to that of the cylindrical lens pair. The beam output from the prisms had better M2 values and less wavefront error than the cylindrical lenses, but the transmitted power was lower. 

Method Beam Intensity Profile Circularitya M2 Values RMS Wavefront Transmitted Power Normalized 
Astigmatismb
Collimated Source Output
(No Circularization Technique)
Collimated
Click to Enlarge

Scale in Microns
0.36 X Axis: 1.28
Y Axis: 1.63
0.17 Not Applicable 0.67
Cylindrical Lens Pair Cylindrical
Click to Enlarge

Scale in Microns
0.84 X Axis: 1.90
Y Axis: 1.93
0.30 91% 0.06
Anamorphic Prism Pair
Anamorphic
Click to Enlarge

Scale in Microns
0.82 X Axis: 1.60
Y Axis: 1.46
0.16 80% 1.25
Spatial Filter Spatial
Click to Enlarge

Scale in Microns
0.93 X Axis: 1.05
Y Axis: 1.10
0.10 34% 0.36
  • Circularity=dminor/dmajor, where dminor and dmajor are minor and major diameters of fitted ellipse (1/e intensity) and Circularity = 1 indicates a perfectly circular beam.
  • Normalized astigmatism is the difference in the waist positions of the two orthogonal components of the beam, divided by the Raleigh length of the beam component with the smaller waist.

Components used in each circularization system were chosen to allow the same experimental setup be used for all experiments. This had the desired effect of allowing the results of all circularization techniques to be directly compared; however, optimizing the setup for a circularization technique could have improved its performance. The mounts used for the collimating lens and the anamorphic prism pair enabled easy manipulation and integration into this experimental system. It is possible that using smaller mounts would improve results by allowing the members of each pair to be more precisely positioned with respect to one another. In addition, using made-to-order cylindrical lenses with customized focal lengths may have improved the results of the cylindrical lens pair circularization system. All results may have been affected by the use of the beam profiler software algorithm to determine the beam radii used in the circularity calculation.

Additional Information

Some information describing selection and configuration procedures for several components used in this experimental work can be accessed by clicking the following hyperlinks: 


Posted Comments:
lzeldin  (posted 2018-06-07 11:17:31.397)
Can you send me the Zemax model used to created the Bi-cylindrical lens circularization mentioned on page 2 of your below document (laser thru output beam) Beam_Circularization_UpdatedTemplate_20170831.pptx and do you have a Zemax data base for using Can Laser Diodes rather than a TEM00 laser. We often have need for doing this for diodes for lab usage and it would be nice not to have to start from scratch with the Zemax code Thanks lzeldin@opci.com
YLohia  (posted 2018-06-13 08:30:20.0)
Hello, thank you for contacting Thorlabs. We did not use any Zemax models for the Beam Circularization Lab Fact -- all data shown is experimental. Unfortunately, we do not have a database for the latter either.

Ø1/2" CaF2 Plano-Convex Cylindrical Lenses, Uncoated

Item # Housing
Diameter
Focal
Lengtha,b
Back Focal
Lengtha,b
Clear
Aperture
Working
Distancea,b
Housing
Thicknessa
Center
Thicknessa
Radius of
Curvaturea
Focal
Shift
Reference
Drawing
LJ5386RM Ø1/2" 20.0 mm 16.4 mm >10.5 mm 15.1 mm 7.4 mm 5.0 mm 8.2 mm Focal Shift Graph
Raw Data
Mounted Plano-Convex Round Cylindrical Lens Drawing
LJ5440RM 50.0 mm 47.9 mm >10.5 mm 46.6 mm 5.0 mm 3.0 mm 20.5 mm Focal Shift Graph
Raw Data
LJ5667RM 80.0 mm 78.2 mm >10.5 mm 76.9 mm 5.0 mm 2.5 mm 32.8 mm Focal Shift Graph
Raw Data
  • These quantities are defined in the Reference Drawing.
  • These values are quoted at the design wavelength, 4 µm. The Focal Shift column contains a plot of the wavelength dependence of the focal length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LJ5386RM Support Documentation
LJ5386RMCustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 20.0 mm, Uncoated
$167.05
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LJ5440RM Support Documentation
LJ5440RMCustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 50.0 mm, Uncoated
$167.05
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LJ5667RM Support Documentation
LJ5667RMCustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 80.0 mm, Uncoated
$167.05
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Ø1/2" CaF2 Plano-Convex Cylindrical Lenses, AR Coated: 1.65 - 3.0 µm

Item # Housing
Diameter
AR Coating
Range
Focal
Lengtha,b
Back Focal
Lengtha,b
Clear
Aperture
Working
Distancea,b
Housing
Thicknessa
Center
Thicknessa
Radius of
Curvaturea
Focal
Shift
Reference
Drawing
LJ5386RM-D Ø1/2" 1.65 - 3.0 µm
(Ravg < 1%)
20.0 mm 16.4 mm >10.5 mm 15.1 mm 7.4 mm 5.0 mm 8.2 mm Focal Shift Graph
Raw Data
Mounted Plano-Convex Round Cylindrical Lens Drawing
LJ5440RM-D 50.0 mm 47.9 mm >10.5 mm 46.6 mm 5.0 mm 3.0 mm 20.5 mm Focal Shift Graph
Raw Data
LJ5667RM-D 80.0 mm 78.2 mm >10.5 mm 76.9 mm 5.0 mm 2.5 mm 32.8 mm Focal Shift Graph
Raw Data
  • These quantities are defined in the Reference Drawing.
  • These values are quoted at the design wavelength, 4 µm. The Focal Shift column contains a plot of the wavelength dependence of the focal length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LJ5386RM-D Support Documentation
LJ5386RM-DCustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 20.0 mm, ARC: 1.65 - 3.0 µm
$210.12
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LJ5440RM-D Support Documentation
LJ5440RM-DCustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 50.0 mm, ARC: 1.65 - 3.0 µm
$210.12
Today
LJ5667RM-D Support Documentation
LJ5667RM-DCustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 80.0 mm, ARC: 1.65 - 3.0 µm
$210.12
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Ø1/2" CaF2 Plano-Convex Cylindrical Lenses, AR Coated: 2 - 5 µm

Item # Housing
Diameter
AR Coating
Range
Focal
Lengtha,b
Back Focal
Lengtha,b
Clear
Aperture
Working
Distancea,b
Housing
Thicknessa
Center
Thicknessa
Radius of
Curvaturea
Focal
Shift
Reference
Drawing
LJ5386RM-E Ø1/2" 2 - 5 µm
(Ravg < 1.25%)
20.0 mm 16.4 mm >10.5 mm 15.1 mm 7.4 mm 5.0 mm 8.2 mm Focal Shift Graph
Raw Data
Mounted Plano-Convex Round Cylindrical Lens Drawing
LJ5440RM-E 50.0 mm 47.9 mm >10.5 mm 46.6 mm 5.0 mm 3.0 mm 20.5 mm Focal Shift Graph
Raw Data
LJ5667RM-E 80.0 mm 78.2 mm >10.5 mm 76.9 mm 5.0 mm 2.5 mm 32.8 mm Focal Shift Graph
Raw Data
  • These quantities are defined in the Reference Drawing.
  • These values are quoted at the design wavelength, 4 µm. The Focal Shift column contains a plot of the wavelength dependence of the focal length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LJ5386RM-E Support Documentation
LJ5386RM-ECustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 20.0 mm, ARC: 2 - 5 µm
$210.12
Today
LJ5440RM-E Support Documentation
LJ5440RM-ECustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 50.0 mm, ARC: 2 - 5 µm
$210.12
Today
LJ5667RM-E Support Documentation
LJ5667RM-ECustomer Inspired! Ø1/2" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 80.0 mm, ARC: 2 - 5 µm
$210.12
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Ø1" CaF2 Plano-Convex Cylindrical Lenses, Uncoated

Item # Housing
Diameter
Focal
Lengtha,b
Back Focal
Lengtha,b
Clear
Aperture
Working
Distancea,b
Housing
Thicknessa
Center
Thicknessa
Radius of
Curvaturea
Focal
Shift
Reference
Drawing
LJ5195RM Ø1" 50.0 mm 45.7 mm >21 mm 44.4 mm 7.9 mm 6.0 mm 20.5 mm Focal Shift Graph
Raw Data
Mounted Plano-Convex Round Cylindrical Lens Drawing
LJ5709RM 75.0 mm 71.8 mm >21 mm 70.5 mm 7.0 mm 4.5 mm 30.7 mm Focal Shift Graph
Raw Data
LJ5654RM 100.0 mm 97.2 mm >21 mm 95.9 mm 7.0 mm 4.0 mm 41.0 mm Focal Shift Graph
Raw Data
LJ5027RM 200.0 mm 197.5 mm >21 mm 196.2 mm 5.3 mm 3.5 mm 81.9 mm Focal Shift Graph
Raw Data
  • These quantities are defined in the Reference Drawing.
  • These values are quoted at the design wavelength, 4 µm. The Focal Shift column contains a plot of the wavelength dependence of the focal length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LJ5195RM Support Documentation
LJ5195RMCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 50.0 mm, Uncoated
$221.68
Today
LJ5709RM Support Documentation
LJ5709RMCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 75.0 mm, Uncoated
$221.68
Today
LJ5654RM Support Documentation
LJ5654RMCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 100.0 mm, Uncoated
$221.68
Today
LJ5027RM Support Documentation
LJ5027RMCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 200.0 mm, Uncoated
$221.68
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Ø1" CaF2 Plano-Convex Cylindrical Lenses, AR Coated: 1.65 - 3.0 µm

Item #Housing
Diameter
AR Coating
Range
Focal
Lengtha,b
Back Focal
Lengtha,b
Clear
Aperture
Working
Distancea,b
Housing
Thicknessa
Center
Thicknessa
Radius of
Curvaturea
Focal
Shift
Reference
Drawing
LJ5195RM-DØ1"1.65 - 3.0 µm
(Ravg < 1%)
50.0 mm45.7 mm>21 mm44.4 mm7.9 mm6.0 mm20.5 mmFocal Shift Graph
Raw Data
Mounted Plano-Convex Round Cylindrical Lens Drawing
LJ5709RM-D75.0 mm71.8 mm>21 mm70.5 mm7.0 mm4.5 mm30.7 mmFocal Shift Graph
Raw Data
LJ5654RM-D100.0 mm97.2 mm>21 mm95.9 mm7.0 mm4.0 mm41.0 mmFocal Shift Graph
Raw Data
LJ5027RM-D200.0 mm197.5 mm>21 mm196.2 mm5.3 mm3.5 mm81.9 mmFocal Shift Graph
Raw Data
  • These quantities are defined in the Reference Drawing.
  • These values are quoted at the design wavelength, 4 µm. The Focal Shift column contains a plot of the wavelength dependence of the focal length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LJ5195RM-D Support Documentation
LJ5195RM-DCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 50.0 mm, ARC: 1.65 - 3.0 µm
$264.75
Today
LJ5709RM-D Support Documentation
LJ5709RM-DCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 75.0 mm, ARC: 1.65 - 3.0 µm
$264.75
Today
LJ5654RM-D Support Documentation
LJ5654RM-DCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 100.0 mm, ARC: 1.65 - 3.0 µm
$264.75
Today
LJ5027RM-D Support Documentation
LJ5027RM-DCustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 200.0 mm, ARC: 1.65 - 3.0 µm
$264.75
Today

Ø1" CaF2 Plano-Convex Cylindrical Lenses, AR Coated: 2 - 5 µm

Item #Housing
Diameter
AR Coating
Range
Focal
Lengtha,b
Back Focal
Lengtha,b
Clear
Aperture
Working
Distancea,b
Housing
Thicknessa
Center
Thicknessa
Radius of
Curvaturea
Focal
Shift
Reference
Drawing
LJ5195RM-EØ1"2 - 5 µm
(Ravg < 1.25%)
50.0 mm45.7 mm>21 mm44.4 mm7.9 mm6.0 mm20.5 mmFocal Shift Graph
Raw Data
Mounted Plano-Convex Round Cylindrical Lens Drawing
LJ5709RM-E75.0 mm71.8 mm>21 mm70.5 mm7.0 mm4.5 mm30.7 mmFocal Shift Graph
Raw Data
LJ5654RM-E100.0 mm97.2 mm>21 mm95.9 mm7.0 mm4.0 mm41.0 mmFocal Shift Graph
Raw Data
LJ5027RM-E200.0 mm197.5 mm>21 mm196.2 mm5.3 mm3.5 mm81.9 mmFocal Shift Graph
Raw Data
  • These quantities are defined in the Reference Drawing.
  • These values are quoted at the design wavelength, 4 µm. The Focal Shift column contains a plot of the wavelength dependence of the focal length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LJ5195RM-E Support Documentation
LJ5195RM-ECustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 50.0 mm, ARC: 2 - 5 µm
$264.75
Today
LJ5709RM-E Support Documentation
LJ5709RM-ECustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 75.0 mm, ARC: 2 - 5 µm
$264.75
Today
LJ5654RM-E Support Documentation
LJ5654RM-ECustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 100.0 mm, ARC: 2 - 5 µm
$264.75
Today
LJ5027RM-E Support Documentation
LJ5027RM-ECustomer Inspired! Ø1" Mounted Plano-Convex CaF2 Cylindrical Lens, f = 200.0 mm, ARC: 2 - 5 µm
$264.75
Today
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