Accession Number:

ADA017605

Title:

Laser Window Surface Finishing and Coating Science

Descriptive Note:

Semiannual technical rept. no. 1, 2 Dec 1974-2 Jun 1975

Corporate Author:

HUGHES RESEARCH LABS MALIBU CA

Report Date:

1975-07-01

Pagination or Media Count:

67.0

Abstract:

The work on thorium tetrafluoride ThF4 film preparation under ultrahigh vacuum conditions has produced films having absorption index values K in the range of 0.0007 to 0.0011. Surface finishing work for KCl placed emphasis on examination of various liquid etchants to determine their compatibility with pitch laps used for surface polishing. Work on the development of a modulated light ellipsometer with operating capability at 10.6 micrometers continued. Various feedback control stabilization schemes are described to provide stability to the light source and the zinc selenide photoelastic modulator used to obtain 10.6 micrometer operation. Data on the refractive index of polycrystalline zinc selenide at 10.6 micrometers as a function of angle are presented. The improvements made to the laser damage test facility are described. The range of pulse durations has been extended to cover from 0.6 microsec to 6 microsec and single longitudinal mode control consisting of a smooth temporal profile has been achieved.

Subject Categories:

  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE