Accession Number : ADA064314
Title : Beam Profiling of a Multimode Laser.
Descriptive Note : Master's Thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
Personal Author(s) : Licata,Raymond J.
Report Date : DEC 1978
Pagination or Media Count : 92
Abstract : The experimental investigation into the intensity profile characteristics of a multimode, high-power, continuous-wave, CO2 laser is presented. Quantitative one-dimensional profiles were obtained using an enhanced swept null point calorimeter. Qualitative two-dimensional profiles were obtained using the IR transparency material -- 3M, Type 577. The results were: the beam divergence is 3.75 mrad; the intensity profile is characterized basically by a circular mode pattern, but superimposed by a distinguishable rectangular component; the rectangular component only varies in intensity proportional to the laser power and inversely proportional to the optical path length; the shot stability is about + or - 7 w/sq cm; and the average profile deviation from an idealized 'flat top' profile varies from 11 to 15%. (Author)
Descriptors : *BEAM FORMING, *CARBON DIOXIDE LASERS, HEAT TRANSFER, HIGH POWER, INTENSITY, THESES, PROFILES, MULTIMODE, LASER DAMAGE, RADIATION HARDENING, CALORIMETRY, INFRARED WINDOWS.
Subject Categories : Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE