Calcium Fluoride Lens | Shanghai Optics

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 make 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.

Factory Standard

Substrate Material: UV & IR Grade CaF2
Shape: Spherical Plano-Concave, P-Convex, Concave-Convex or Aspheric
Surface Figure: λ /4 at 633nm typical
Surface Quality: 60-40 per MIL-PRF-13830B
Dimensional Tolerance: + 0.00mm, – 0.1mm
Thickness Tolerance: +/- 0.1mm
Chamfer: 0.35mm at 45° typical
Concentricity: 0.05mm
Focal Length Tolerance: +/- 0.5% typical
Antireflection Coating: User-specified, R<0.25% per surface
Clear Aperture: Exceeds central 85% of dimension
Damage Threshold: 5J/cm2, 20ns, 20Hz at 1064nm

IR GRADE				All measurements in mm
Part Number	Nominal	Diameter	800nm	1064nm	2940nm	5000nm	Radius
	F	D	F	F	F	F	R	TC	TE
PLCX-25.4-20.6-CFIR	50	25.4	47.8	48.1	49.3	51.6	20.6	7.4	3
PLCX-25.4-31.4-CFIR	75	25.4	72.9	73.2	75	78.6	31.4	5.7	3
PLCX-25.4-41.9-CFIR	100	25.4	97.3	97.8	100.1	105	41.9	5	3
PLCX-38.1-41.9-CFIR	100	38.1	97.3	97.8	100.1	105	41.9	8.6	4
PLCX-25.4-62.7-CFIR	150	25.4	145.7	146.4	150	157.2	62.7	4.3	3
PLCX-25.4-83.8-CFIR	200	25.4	194.7	195.7	200.5	210.2	83.8	4	3
PLCX-25.4-104.0-CFIR	250	25.4	241.6	242.7	248.7	260.7	104	3.8	3
PLCX-25.4-210.0-CFIR	500	25.4	487.8	490.1	502.1	526.4	210	3.4	3
PLCX-25.4-417.7-CFIR	1000	25.4	970.1	974.7	998.5	1046.9	417.7	3.2	3

UV GRADE				All measurements in mm
Part Number	Nominal	Diameter	193nm	212nm	248nm	308nm	Radius
	F	D	F	F	F	F	R	TC	TE
PLCX-12.7-11.9-CFUV	25	12.7	23.6	24.4	25.3	23.2	11.9	3.8	2
PLCX-25.4-23.6-CFUV	50	25.4	47	48.5	50.4	52.1	23.6	6.7	3
PLCX-25.4-35.0-CFUV	75	25.4	69.8	72.1	74.8	77.3	35	5.4	3
PLCX-25.4-46.4-CFUV	100	25.4	92.5	95.6	99.1	102.5	46.4	4.8	3
PLCX-38.1-46.4-CFUV	100	38.1	92.5	95.6	99.1	102.5	46.4	8.1	4
PLCX-25.4-70.6-CFUV	150	25.4	140.8	145.4	150.9	156	70.6	4.2	3
PLCX-50.8-70.6-CFUV	150	50.8	140.8	145.4	150.9	156	70.6	9.7	5
PLCX-50.8-93.2-CFUV	200	50.8	185.9	192	199.2	206	93.2	8.6	5
PLCX-25.4-118.0-CFUV	250	25.4	235.2	243	252.1	206.7	118	3.7	3
PLCX-25.4.231.8-CFUV	500	25.4	462.2	477.4	495.3	512.2	231.8	3.3	3
PLCX-50.8-231.8-CFUV	500	50.8	462.2	477.4	495.3	512.2	231.8	6.4	5
PLCX-25.4-469.5-CFUV	1000	25.4	936.2	966.9	1003.2	1037.5	469.5	3.2	3
PLCX-50.8-469.5-CFUV	1000	50.8	936.2	966.9	1003.2	1037.5	469.5	5.7	5