Accession Number : ADB058406

Title :   Electric-Pulse-Initiated Chemical Laser.

Descriptive Note : Final technical rept. 2 May 77-30 Aug 80,

Corporate Author : RAYTHEON CO WALTHAM MA RESEARCH DIV

Personal Author(s) : Rudko, R. I. ; Bua, D. P. ; Drozdowicz, Z. ; Linhares, S. J.

Report Date : MAY 1981

Pagination or Media Count : 102

Abstract : This study deals with a high-repetition-rate multispectral laser source providing simultaneous emission on many lines in the 2.5-3.0 micron, 3.5-4.0 micron, and 4.3-5.0 micron regions. This program was an experimental investigation to assess the operational characteristics of compact, high-repetition-rate mid-infrared laser sources capable of multispectral operation. An HF/DF/HBr, electrically-initiated TE chemical laser was originally selected as a good candidate for such a system. HBr was found not to be a suitable laser medium for a small system, owing to its low gain. An HF-laser-pumped, isotopic CO2 laser was selected to replace it and to cover the 4.3-5.0 micron region. This laser was investigated in an extension of the original contract. The HF/DF chemical laser was capable of sustaining up to 10,000 discharges per second in gas mixtures containing SF6 and, separately or jointly, H2 and D2. Over 1 millijoule per pulse outputs were obtained up to 4,200 pps in HF, weaker outputs being still available even at the 10,000 pps repetition rate. Peak average powers were 4.5 W for HF and 2.0 W for DF lasers. The laser was operated in a recirculating mode to make efficient use of the reactant gases. Chemical scrubbers were used to remove the discharge and reaction products, thus improving laser performance. Atmospheric pressure operation of this system was also achieved.

Descriptors :   *CHEMICAL LASERS, *HYDROGEN FLUORIDE LASERS, *LASER PUMPING, *CARBON DIOXIDE LASERS, *INFRARED LASERS, MULTISPECTRAL, TEA LASERS, DEUTERIUM COMPOUNDS, FLUORIDES, SULFUR COMPOUNDS, HYDROGEN, DEUTERIUM, GASES, ISOTOPES, GAS LASERS, SCRUBBERS, PULSES.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE