Accession Number:

ADA012290

Title:

Investigations into the Feasibility of High Power Laser Window Materials

Descriptive Note:

Semiannual technical rept. no. 1

Corporate Author:

AVCO EVERETT RESEARCH LAB INC EVERETT MA

Personal Author(s):

Report Date:

1975-04-15

Pagination or Media Count:

36.0

Abstract:

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.

Subject Categories:

  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE