title: Studies on the spectral purity of copper-hydrogen bromide laser radiations.
abstract: This paper presents, for the first time to the best of our knowledge, the linewidth, frequency, and stability characteristics of a copper-HBr laser. These spectral purity attributes were found to be critically linked with the electrical input power and HBr concentration, unlike that of the optical resonator. Variation in green and yellow radiation linewidths from 4 to 4.5 GHz and from 6.5 to 8.8 GHz, linewidth fluctuations from 50 to 150 MHz and from 60 to 530 MHz as well as frequency fluctuations from 10 to 100 MHz and from 410 to 10 MHz were observed when varying the input power and HBr concentration. These results are comprehensively analyzed in terms of isotopic shift, hyperfine splitting, line broadening, and temperature and gain distribution effects relevant to this laser.
authors.affiliation: Laser Systems Engineering Section, Raja Ramanna Center for Advanced Technology, Indore 452013, India. rbiswal@rrcat.gov.in
authors.forename: Ramakanta
authors.initials: R
authors.lastname: Biswal
authors.forename: Govind Kumar
authors.initials: GK
authors.lastname: Mishra
authors.forename: Praveen Kumar
authors.initials: PK
authors.lastname: Agrawal
authors.forename: Shankar V
authors.initials: SV
authors.lastname: Nakhe
authors.forename: Sudhir Kumar
authors.initials: SK
authors.lastname: Dixit