Potassium Chloride (KCl)

Potassium Chloride is used for low cost CO2 laser optics and infrared windows, lenses, and prisms when transmission in the range to 20µm is desired (transmission extends beyond that of Sodium Chloride). Potassium Chloride is soluble in water and polished surfaces must be protected from moisture. Maximum use temperature is 400°C.

 

Property Specification
Transmission Range 0.21µm to 20µm
Density 1.989
gm/cm3
Thermal Expansion 36 x 10-6 /°C
Surface Finish Generally 60-40 or 80-50 scratch-dig in the Infrared.
Surface Figure Generally λ/20 @ 10.6µm
AR Coating Options Moisture Protection (Specify Wavelength of Use).
Typical Applications IR Spectroscopic components, beamsplitters, CO2 lasers.
Products Manufactured Windows, Lenses, Lens Protectors, Wedges, Aspheric Lenses.

 

Wavelength (µm)
Index of Refraction (n)
2.3573
1.475

4.7146
1.471
5.8932
1.469
8.2505
1.463
10.0184
1.457
12.9650
1.443
14.1410
1.437
15.9120
1.426
18.2000
1.409
20.4000
1.389
22.2000
1.374
24.1000
1.352
26.7000
1.300
28.2000
1.254