Calcium fluoride (CaF₂) Windows/Lenses
Material:
UV Grade CaF₂, IR grade CaF₂
Thickness:
+/-0.2mm
Surface Flatness:
N<λ/8
Coating:
Uncoated
Diameter Tolerance:
+0.0,-0.1mm
Surface Quality:
60/40~20/10
Parallelism:
<10”
Calcium fluoride (CaF₂) Windows provide high transmission from the ultraviolet (180 nm) to the infrared (8 μm).Calcium fluoride has a low absorption coefficient and high damage threshold, making these windows a good choice for use with free-space lasers. Optical calcium fluoride offers low dispersion (with an Abbe Number of 95) and low fluorescence, as well as excellent water, chemical, and heat resistance. In dry environments, CaF2 can be used up to 1000 °C, but in the presence of moisture, degradation will occur for temperatures exceeding 600 °C. Each window has a randomly oriented crystal axis.
wdt_ID Attributes Value
1
Material
UV Grade CaF₂
IR grade CaF₂
17
Diameter Tolerance
+0.0,-0.1mm
18
Thickness
+/-0.2mm
19
Surface Quality
60/40~20/10
20
Surface Flatness
N＜λ/8
21
Parallelism
＜10 arc Sec
22
Coating
Uncoated
| wdt_ID | Attributes | Value |
|---|---|---|
| 1 | Material | UV Grade CaF₂ IR grade CaF₂ |
| 17 | Diameter Tolerance | +0.0,-0.1mm |
| 18 | Thickness | +/-0.2mm |
| 19 | Surface Quality | 60/40~20/10 |
| 20 | Surface Flatness | N＜λ/8 |
| 21 | Parallelism | ＜10 arc Sec |
| 22 | Coating | Uncoated |
wdt_ID Part No. Material S/D dia (mm) Thickness Coating
27
WIN31253
UV CaF₂
60/40
12.5
3.0
None
90
WIN31273
UV CaF₂
60/40
12.7
3.0
None
195
WIN3255
UV CaF₂
60/40
25.0
5.0
None
196
WIN32545
UV CaF₂
60/40
25.4
5.0
None
197
WIN3405
UV CaF₂
60/40
40.0
5.0
None
198
WIN3508
UV CaF₂
60/40
50.0
8.0
None
| wdt_ID | Part No. | Material | S/D | dia (mm) | Thickness | Coating |
|---|---|---|---|---|---|---|
| 27 | WIN31253 | UV CaF₂ | 60/40 | 12.5 | 3.0 | None |
| 90 | WIN31273 | UV CaF₂ | 60/40 | 12.7 | 3.0 | None |
| 195 | WIN3255 | UV CaF₂ | 60/40 | 25.0 | 5.0 | None |
| 196 | WIN32545 | UV CaF₂ | 60/40 | 25.4 | 5.0 | None |
| 197 | WIN3405 | UV CaF₂ | 60/40 | 40.0 | 5.0 | None |
| 198 | WIN3508 | UV CaF₂ | 60/40 | 50.0 | 8.0 | None |
Related Resource for reference
Overview
• Transmittance of IR glasses
• Comparison IR vs. Visible glasses
• Properties of some common IR glasses
– Germanium
– Silicon
– Zinc Sulfide
– Zinc Selenide
– Magnesium Fluoride
– Sapphire
• Concerns using lens design programs
• References OPTI 521 2
Materials for Infrared Optics
Related Products
Zinc Selenide (ZnSe) Windows / Lenses
Silicon Windows/Lenses
Germanium Windows/Lenses
