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Calcium Fluoride Plano-Convex Lenses, Uncoated


  • Uncoated for the 0.18 - 8.0 µm Wavelength Range
  • Choose from Ø1/2" or Ø1"
  • Ideal for use with Excimer Lasers

LA5042

(Ø1")

LA5183

(Ø1/2")

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Specifications
Material Vacuum-Grade Calcium Fluoride
Wavelength Range 0.18 - 8.0 μm
Diameter Tolerance +0.0 mm / -0.1 mm
Thickness Tolerance ±0.1 mm
Focal Length Tolerance ±1%
Surface Quality 40-20 Scratch-Dig
Surface Flatness (Plano Side) λ/2
Spherical Surface Powera (Convex Side) 3λ/2
Surface Irregularity (Peak to Valley) λ/2
Centration ≤3 arcmin
Clear Aperture >90% of Diameter
Design Wavelength 588 nm
  • 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.
Optic Cleaning Tutorial Optical Coatings and Substrates
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.

Features

  • Vacuum-Grade Calcium Fluoride Substrate
  • Ø1/2" and Ø1" Versions Available
  • Uncoated for the 0.18 - 8.0 µm Wavelength Range
  • Focal Lengths from 20.0 - 1000.0 mm

Thorlabs' Ø1/2" and Ø1" Calcium Fluoride (CaF2) Plano-Convex Lenses, which offer high transmission from 0.18 - 8.0 μm, are available uncoated. See the Graphs tab for detailed information about the transmission of CaF2.

Coated CaF2 Plano-Convex Lenses are also available, which are coated for either the 1.65 - 3.0 µm or 2 - 5 µm wavelength range.

CaF2 is commonly used for applications requiring high transmission in the infrared and ultraviolet spectral ranges. Its extremely high laser damage threshold makes it useful for use with excimer lasers. The material exhibits a low refractive index, varying from 1.35 to 1.51 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.

Plano-Convex lenses have a positive focal length and approach best form for infinite and finite conjugate applications. Please click here for details concerning Best Form Lenses. These lenses focus a collimated beam to the back focus and collimate light from a point source. They are designed with minimal spherical aberration and have a focal length which can be calculated using a simplified thick lens equation:

f= R/(n-1)

where n is the index of refraction and R is the radius of curvature of the lens surface.

Usage:
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 light source, the collimated light should be incident on the curved surface. Similarly, when collimating a point source of light, the diverging light rays should be incident on the planar surface of the lens.

Selection Guide
Other MIR Lenses
Zinc Selenide Plano-Convex G Coated (7 - 12 µm)
Bi-Convex E3 Coated (7 - 12 µm)
Plano-Concave F Coated (8 - 12 µm)
Bi-Concave F Coated (8 - 12 µm)
Positive Meniscus F Coated (8 - 12 µm)
Negative Meniscus F Coated (8 - 12 µm)
Magnesium Fluoride Plano-Convex Uncoated (0.2 - 6 µm)
Barium Fluoride Plano-Convex E Coated (2 - 5 µm)
Silicon Plano-Convex E Coated (3 - 5 µm)
Germanium Plano-Convex E3 Coated (7 - 12 µm)
Transmission of Uncoated CaF2
Click to Enlarge

Click Here for Raw Data

Wavelength-Dependent Focal Length Shift

The paraxial focal length of a lens is wavelength dependent. The focal length listed below for a given lens corresponds to the value at the design wavelength (i.e., the focal length at 588 nm). Since CaF2 offers high transmission from 0.18 - 8.0 µm, users may wish to use these lenses at other popular wavelengths. Click on the icons below to view theoretically-calculated focal length shifts for wavelengths within the 0.18 - 8.0 µm range.

Ø1/2" Plano-Convex Lenses

Item #LA5315LA5183LA5458
Focal Length @ 588 nm20.0 mm50.0 mm80.0 mm
Focal Length Shift
(Click for Details)
Raw Data
(Click to Download)
DataDataData

Ø1" Plano-Convex Lenses

Item #LA5370LA5763LA5042LA5817LA5012LA5714LA5255LA5464LA5956LA5835
Focal Length @ 588 nm40.0 mm50.0 mm75.0 mm100.0 mm150.0 mm200.0 mm250.0 mm500.0 mm750.0 mm1000.0 mm
Focal Length Shift
(Click for Details)
Raw Data
(Click to Download)
DataDataDataDataDataDataDataDataDataData
CXY1 in 30 mm Cage System
Click to Enlarge

CXY1 Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System
Threaded Mounting Adapter
Click to Enlarge

Ø1" Optic Mounted in a
ST1XY-S XY Translator

Click to Enlarge

LMR1 Fixed Mount with Ø1" Lens

Click to Enlarge

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" (Ø25.4 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.


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Posted Comments:
Poster:tcohen
Posted Date:2012-11-13 14:55:00.0
Response from Tim at Thorlabs: Thank you for your suggestion! We are continually introducing new optics to our catalog. We will discuss this so that we can look to add larger CaF2 lenses as a future customer inspired product.
Poster:
Posted Date:2012-11-06 17:40:54.897
It would be great if you also sold 2" diameter CaF2 lenses.
Poster:bdada
Posted Date:2011-10-25 15:34:00.0
Response from Buki at Thorlabs: Thank you for using our Web Feedback tool. The beam waist is a function of the wavelength and focusing angle of the lens. You can use the following equation: beam waist = lambda/(pi x focusing angle (in radians)) We have contacted you to discuss this further and assist you in calculating the beam waist.
Poster:deibel
Posted Date:2011-10-25 13:22:34.0
Hello, I need to know how big the beam waist is (is the beam waist of a bi-convex lens smaller, same focal length). Especially for 2,94um. I need different focal lengths (75mm; 100mm; 150mm; 200mm) of CaF2-lenses. Is there some data on beam waists? Thank you very much.
Poster:Thorlabs
Posted Date:2010-06-23 10:44:19.0
Response from Javier at Thorlabs to yan.ying: We have the capability to manufacture a wide variety of custom optics, including CaF2 lenses.In order to check for a possible solution for this custom lens, we would require a complete design description (e.g. ZEMAX design file). I will contact you directly to discuss the details.
Poster:yan.ying
Posted Date:2010-06-23 10:12:06.0
Hi, I am interested in a CaF2 plano-convex lens with 300mm focal length and 25.4mm diameter. Do you have this? If it is a custom order how long time will it take for manufacturing? Thank you in advance.

Ø1/2" CaF2 Plano-Convex Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Lengthc Reference
Drawing
LA5315 1/2" (12.7 mm) 20.0 mm +50.0 8.7 mm 4.3 mm 1.5 mm 17.0 mm Plano-Convex Lens Drawing
LA5183 1/2" (12.7 mm) 50.0 mm +20.0 21.7 mm 2.5 mm 1.5 mm 48.3 mm
LA5458 1/2" (12.7 mm) 80.0 mm +12.5 34.7 mm 2.1 mm 1.5 mm 78.5 mm

Suggested Fixed Lens Mount: LMR05(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge thickness given before 0.2 mm at 45° typical chamfer.
  • Measured at the design wavelength, 588 nm.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA5315 Support Documentation
LA5315Ø1/2" CaF2 Plano-Convex Lens, f = 20.0 mm, Uncoated
$105.00
Today
LA5183 Support Documentation
LA5183Ø1/2" CaF2 Plano-Convex Lens, f = 50.0 mm, Uncoated
$108.00
Today
LA5458 Support Documentation
LA5458Ø1/2" CaF2 Plano-Convex Lens, f = 80.0 mm, Uncoated
$96.50
Today

Ø1" CaF2 Plano-Convex Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Lengthc Reference
Drawing
LA5370 1" (25.4 mm) 40.0 mm +25.0 17.4 mm 7.5 mm 2.0 mm 34.7 mm Plano-Convex Lens Drawing
LA5763 1" (25.4 mm) 50.0 mm +20.5 21.7 mm 6.1 mm 2.0 mm 45.7 mm
LA5042 1" (25.4 mm) 75.0 mm +13.3 32.5 mm 4.6 mm 2.0 mm 71.8 mm
LA5817 1" (25.4 mm) 100.0 mm +10.0 43.4 mm 3.9 mm 2.0 mm 97.3 mm
LA5012 1" (25.4 mm) 150.0 mm +6.7 65.1 mm 3.3 mm 2.0 mm 147.7 mm
LA5714 1" (25.4 mm) 200.0 mm +5.0 86.8 mm 2.9 mm 2.0 mm 198.0 mm
LA5255 1" (25.4 mm) 250.0 mm +4.0 108.5 mm 2.7 mm 2.0 mm 248.1 mm
LA5464 1" (25.4 mm) 500.0 mm +2.0 216.9 mm 2.4 mm 2.0 mm 498.3 mm
LA5956 1" (25.4 mm) 750.0 mm +1.3 325.4 mm 2.2 mm 2.0 mm 748.4 mm
LA5835 1" (25.4 mm) 1000.0 mm +1.0 433.9 mm 2.2 mm 2.0 mm 998.5 mm

Suggested Fixed Lens Mount: LMR1(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge thickness given before 0.2 mm at 45° typical chamfer.
  • Measured at the design wavelength, 588 nm.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA5370 Support Documentation
LA5370 Ø1" CaF2 Plano-Convex Lens, f = 40.0 mm, Uncoated
$156.00
Today
LA5763 Support Documentation
LA5763 Ø1" CaF2 Plano-Convex Lens, f = 50.0 mm, Uncoated
$167.00
Today
LA5042 Support Documentation
LA5042 Ø1" CaF2 Plano-Convex Lens, f = 75.0 mm, Uncoated
$199.00
Today
LA5817 Support Documentation
LA5817 Ø1" CaF2 Plano-Convex Lens, f = 100.0 mm, Uncoated
$98.75
Today
LA5012 Support Documentation
LA5012 Ø1" CaF2 Plano-Convex Lens, f = 150.0 mm, Uncoated
$110.00
Today
LA5714 Support Documentation
LA5714 Ø1" CaF2 Plano-Convex Lens, f = 200.0 mm, Uncoated
$111.00
Today
LA5255 Support Documentation
LA5255 Ø1" CaF2 Plano-Convex Lens, f = 250.0 mm, Uncoated
$132.00
Today
LA5464 Support Documentation
LA5464 Ø1" CaF2 Plano-Convex Lens, f = 500.0 mm, Uncoated
$104.00
Today
LA5956 Support Documentation
LA5956 Ø1" CaF2 Plano-Convex Lens, f = 750.0 mm, Uncoated
$110.00
Today
LA5835 Support Documentation
LA5835 Ø1" CaF2 Plano-Convex Lens, f = 1000.0 mm, Uncoated
$108.00
Today
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