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Calcium Fluoride Double-Convex (DCX) Lenses

Greater than 90% Transmission from 350nm-7μm
Low Index of Refraction

Calcium Fluoride is often used in spectroscopic windows and lenses due to its high transmission from 350nm to 7μm. Calcium Fluoride is also commonly found in cryogenically cooled thermal imaging systems. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium Fluoride's low refractive index allows it to be used without an antireflective coating. The Knoop hardness of Calcium Fluoride is 158.3.

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CaF2 Double-Convex Lens, 25.4mm Diameter x 25.4mm FL

#47-056

$350.00

Diameter (mm)	25.40
Diameter Tolerance (mm)	+0.00/-0.13
Clear Aperture (%)	90
Effective Focal Length EFL @ 5.0μm (mm)	25.40
Effective Focal Length EFL @ 2.94μm (mm)	24.34
Effective Focal Length EFL @ 1.064μm (mm)	23.80
Effective Focal Length EFL @ 0.6328μm (mm)	23.58
Effective Focal Length EFL @ 0.2μm (mm)	18.55
Back Focal Length BFL (mm) @ DWL	20.61
Focal Length Tolerance (%)	±2 at DWL
Edge Thickness ET (mm)	2.00
Center Thickness CT (mm)	12.20
Center Thickness Tolerance (mm)	±0.2
Radius R₁=-R₂ (mm)	18.37
Surface Quality	60-40
Surface Accuracy (λ)	1 @ 0.63μm
Bevel	0.90mm (Max Face Width) x 45°
Design Wavelength DWL (µm)	5
Coating	Uncoated
Substrate	Calcium Fluoride CaF₂
RoHS	Exempt

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CaF2 Double-Convex Lens, 25.4mm Diameter x 50.8mm FL

#47-057

$250.00

Diameter (mm)	25.40
Diameter Tolerance (mm)	+0.00/-0.13
Clear Aperture (%)	90
Effective Focal Length EFL @ 5.0μm (mm)	50.80
Effective Focal Length EFL @ 2.94μm (mm)	48.47
Effective Focal Length EFL @ 1.064μm (mm)	47.33
Effective Focal Length EFL @ 0.6328μm (mm)	46.86
Effective Focal Length EFL @ 0.2μm (mm)	40.00
Back Focal Length BFL (mm) @ DWL	48.51
Focal Length Tolerance (%)	±2 at DWL
Edge Thickness ET (mm)	2.00
Center Thickness CT (mm)	6.20
Center Thickness Tolerance (mm)	±0.2
Radius R₁=-R₂ (mm)	39.61
Surface Quality	60-40
Surface Accuracy (λ)	1 @ 0.63μm
Bevel	0.90mm (Max Face Width) x 45°
Design Wavelength DWL (µm)	5
Coating	Uncoated
Substrate	Calcium Fluoride CaF₂
RoHS	Exempt

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CaF2 Double-Convex Lens, 25.4mm Diameter x 63.5mm FL

#48-018

$250.00

Diameter (mm)	25.40
Diameter Tolerance (mm)	+0.00/-0.13
Clear Aperture (%)	90
Effective Focal Length EFL @ 5.0μm (mm)	63.50
Effective Focal Length EFL @ 2.94μm (mm)	60.59
Effective Focal Length EFL @ 1.064μm (mm)	59.16
Effective Focal Length EFL @ 0.6328μm (mm)	58.57
Effective Focal Length EFL @ 0.2μm (mm)	50.38
Back Focal Length BFL (mm) @ DWL	61.56
Focal Length Tolerance (%)	±2 at DWL
Edge Thickness ET (mm)	2.00
Center Thickness CT (mm)	5.30
Center Thickness Tolerance (mm)	±0.2
Radius R₁=-R₂ (mm)	49.89
Surface Quality	60-40
Surface Accuracy (λ)	1 @ 0.63μm
Bevel	0.90mm (Max Face Width) x 45°
Design Wavelength DWL (µm)	5
Coating	Uncoated
Substrate	Calcium Fluoride CaF₂
RoHS	Compliant

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CaF2 Double-Convex Lens, 25.4mm Diameter x 76.2mm FL

#47-058

$250.00

Diameter (mm)	25.40
Diameter Tolerance (mm)	+0.00/-0.13
Clear Aperture (%)	90
Effective Focal Length EFL @ 5.0μm (mm)	76.20
Effective Focal Length EFL @ 2.94μm (mm)	72.71
Effective Focal Length EFL @ 1.064μm (mm)	70.99
Effective Focal Length EFL @ 0.6328μm (mm)	70.27
Effective Focal Length EFL @ 0.2μm (mm)	60.72
Back Focal Length BFL (mm) @ DWL	74.50
Focal Length Tolerance (%)	±2 at DWL
Edge Thickness ET (mm)	2.00
Center Thickness CT (mm)	4.70
Center Thickness Tolerance (mm)	±0.2
Radius R₁=-R₂ (mm)	60.12
Surface Quality	60-40
Surface Accuracy (λ)	1 @ 0.63μm
Bevel	0.90mm (Max Face Width) x 45°
Design Wavelength DWL (µm)	5
Coating	Uncoated
Substrate	Calcium Fluoride CaF₂
RoHS	Exempt

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CaF2 Double-Convex Lens, 25.4mm Diameter x 100mm FL

#47-059

$250.00

Diameter (mm)	25.40
Diameter Tolerance (mm)	+0.00/-0.13
Clear Aperture (%)	90
Effective Focal Length EFL @ 5.0μm (mm)	100.00
Effective Focal Length EFL @ 2.94μm (mm)	95.25
Effective Focal Length EFL @ 1.064μm (mm)	92.99
Effective Focal Length EFL @ 0.6328μm (mm)	92.05
Effective Focal Length EFL @ 0.2μm (mm)	79.85
Back Focal Length BFL (mm) @ DWL	98.36
Focal Length Tolerance (%)	±2 at DWL
Edge Thickness ET (mm)	2.00
Center Thickness CT (mm)	4.10
Center Thickness Tolerance (mm)	±0.2
Radius R₁=-R₂ (mm)	79.07
Surface Quality	60-40
Surface Accuracy (λ)	1 @ 0.63μm
Bevel	0.90mm (Max Face Width) x 45°
Design Wavelength DWL (µm)	5
Coating	Uncoated
Substrate	Calcium Fluoride CaF₂
RoHS	Exempt

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CaF2 Double-Convex Lens, 25.4mm Diameter x 150mm FL

#48-019

$195.00

Diameter (mm)	25.40
Diameter Tolerance (mm)	+0.00/-0.13
Clear Aperture (%)	90
Effective Focal Length EFL @ 5.0μm (mm)	150.00
Effective Focal Length EFL @ 2.94μm (mm)	143.00
Effective Focal Length EFL @ 1.064μm (mm)	139.60
Effective Focal Length EFL @ 0.6328μm (mm)	138.18
Effective Focal Length EFL @ 0.2μm (mm)	120.30
Back Focal Length BFL (mm) @ DWL	148.68
Focal Length Tolerance (%)	±2 at DWL
Edge Thickness ET (mm)	2.00
Center Thickness CT (mm)	3.40
Center Thickness Tolerance (mm)	±0.2
Radius R₁=-R₂ (mm)	119.12
Surface Quality	60-40
Surface Accuracy (λ)	1 @ 0.63μm
Bevel	0.90mm (Max Face Width) x 45°
Design Wavelength DWL (µm)	5
Coating	Uncoated
Substrate	Calcium Fluoride CaF₂
RoHS	Compliant

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Calcium Fluoride Double-Convex (DCX) Lenses

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