Laser Beam Propagation Through Jet Exhausts
Technical rept. Jan-Apr 1970
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
Pagination or Media Count:
CO2 10.6 micron and He-Ne 6328A laser beams were passed through the highly turbulent region in the exhaust of a jet engine J-57 with afterburner. Experimental information was obtained on the absorption, scattering and turbulence effects of the jet exhaust on both laser beams for various propagation paths. Estimates of a structure constant that would characterize the turbulence in the exhaust are made from the beam spread of focused and collimated beams. The structure constant obtained in this manner is then compared with the structure constant determined from scintillation measurements on the CO2 beam and with the results of hot-wire anemometer readings in the exhaust. The various methods yield results for the structure constant that are in good agreement.
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