Accession Number : ADA323020

Title :   Repetitively Pulsed, 70 Joule Photolytic Iodine Laser with Excellent Optical and Long/Reliable Operation.

Descriptive Note : Final rept. 4 Mar 94-4 Oct 94,

Corporate Author : PHILLIPS LAB KIRTLAND AFB NM

Personal Author(s) : Schlie, L. A. ; Rathge, R. D.

PDF Url : ADA323020

Report Date : AUG 1996

Pagination or Media Count : 49

Abstract : The performance of repetitively pulsed, 70 joule, closed cycle 1.3 uM photolytic atomic iodine laser with excellent beam quality (BQ = 1.15) is presented. This BQ was exhibited in the fundamental mode from a M = 3.1 confocal unstable resonator at a 0.5 Hz repetition rate. A closed cycle scrubber/laser fuel system consisting of a condensative-evaporative section, two Cu wool 12 reactor regions, and an internal turbo-blower enabled the laser to operate very reliably with low maintenance. The fuel system provided C3F71 gas at 10-60 torr absent of the photolytic quenching by-product 12. Using a turbo-molecular blower longitudinal flow velocities greater than 10 m/s were achieved through the 150 cm long by 7.5 x 7.5 sq cm cross sectional photolytic iodine gain region. In addition to the high laser output and excellent BQ, the resulting 8-12 usec laser pulse had a coherence length greater than 45 meters and polarization extinction ratio better than 100:1. Projections from this pulsed photolytic atomic iodine laser technology to laser energies, higher repetition rates, and variable pulse widths are discussed.

Descriptors :   *LASERS, MAINTENANCE, OUTPUT, FUEL SYSTEMS, EXTINCTION, OPTICAL PROPERTIES, RATIOS, POLARIZATION, HIGH RATE, REPETITION RATE, ENERGY, COHERENCE, PULSED LASERS, VARIABLES, PULSE RATE, RELIABILITY, LENGTH, OPERATION.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE