Accession Number:

ADA230354

Title:

Characterization of AgGaSe2 and ZnGeP2 for Frequency Doubling CO2 Laser Output

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1990-09-01

Pagination or Media Count:

142.0

Abstract:

This experiment was to characterize the nonlinear performance of AgGaSe2 and ZnGeP2 for frequency doubling CO2 laser output at 10.6 um. The experiments included a series of theoretical estimates of the source and crystal performance to define the measurements to be performed. The parameters of interest were the phase matching angles, angular acceptance, conversion efficiency and damage thresholds. The 9mmX9mmX29mm antireflection coated sample of AgGaSe2, with a phase matching angle of theta55.02 deg. and an internal acceptance bandwidth Delta theta0.298 deg., achieved a maximum second harmonic conversion efficiency of 20.5. Surface damage limited the improvement of the efficiency and the threshold for the coated surface was near 4.5kWcm. Further damage studies were conducted using small witness samples from the same crystal boule. For the case of the uncoated sample of ZnGeP2, the theoretical computations pointed out that the performance would have been poor at best due to an extremely small effective nonlinear coefficient at the temperature tuned phase matching angles. These calculations are presented, though no output at 5.3 um was observed during these experiments. Improvements to the experimental designs and theoretical estimates.

Subject Categories:

  • Lasers and Masers
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE