Investigations into the Feasibility of High Power Laser Window Materials
Semiannual technical rept. no. 1
AVCO EVERETT RESEARCH LAB INC EVERETT MA
Pagination or Media Count:
A test facility is being constructed for testing laser window material. This will use the focused beam from a 15 kW CW laser at 10.6 micrometers or other available lasers. Provision for cooling the window is included and also instrumentation for measuring optical and mechanical effects. Forty-seven natural diamonds have been tested to find the correlation between the UV absorption spectrum, the IR absorption spectrum and the absorption coefficient beta at 10.6 micrometets. Transparency at .253 micrometer is roughly correlated with low values of beta. A water cooled diamond window holder is described. A specimen of single crystal CaF2 and another of pressure induced recrystalized CaF2 were exposed to a 20 joule, 5 microsec 6.7 x 10 to the 7th power wattsq cm pulse of 2.8 micrometer laser radiation with no apparent damage.
- Lasers and Masers