Accession Number : AD0751680

Title :   Acoustic-Optic Modulator Design for a High Power Mode-Locked CO2 Laser.

Descriptive Note : Interim rept.,

Corporate Author : UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CONN

Personal Author(s) : Flynn,J. Terrence ; Berger,Paul J.

Report Date : 01 NOV 1972

Pagination or Media Count : 26

Abstract : The report describes the design considerations and construction details involved in the development of a Brewster angle germanium acousto-optic modulator, having a 6 mm square aperture. This modulator was used to mode-lock an electrically pulsed transversely excited atmospheric (TEA) CO2 laser at an axial-mode frequency of 44 MHz. The power insertion loss was measured to be 50 percent and the modulator withstood peak intracavity intensities in excess of 6 MW/sq. cm. (.2 microsecond pulse) and 160 MW/sq. cm. (1 nsec pulse) without damage, representing significant improvements over the performance of anti-reflection coated modulators. After correcting for the risetime of the display system, the mode-locked pulses are estimated to have a pulsewidth of 1.2 nsec and a peak power of 20 megawatts. (Author)

Descriptors :   (*GAS LASERS, MODULATORS), INFRARED LASERS, GERMANIUM, LIGHT PULSES, MODULATION, EXPERIMENTAL DESIGN

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE