Title :
Stimulated rotational Raman conversion in H2, D2 , and HD
Author :
Hanson, Frank ; Poirier, Pete
Author_Institution :
NCCOSC, San Diego, CA, USA
fDate :
8/1/1993 12:00:00 AM
Abstract :
Stimulated rotational Raman conversion has been efficiently demonstrated in all three molecular hydrogen isotopes with a 532-nm Q-switched pump source. Optimum gas pressures and pump focusing have been determined. Single pass conversion efficiencies of 80%, 75%, and 65% have been achieved at the first Stokes wavelengths with H2 , D2, and HD, respectively. The maximum efficiency is generally limited by further Raman conversion of the initially generated Stokes light. The thresholds were found to increase in the order H2 <D2<HD as expected. With the 100 cm lens, the threshold for HD is ~8 times that for H2. The relative thresholds of H2 and D2 are reasonably consistent with the calculated steady-state gains based on the population statistics and the linewidth data. Intermediate frequency shifts such as these may be useful by themselves, or in combination with other nonlinear techniques, as methods to achieve specific wavelengths for system applications
Keywords :
deuterium; deuterium compounds; hydrogen neutral molecules; optical pumping; stimulated Raman scattering; 532 nm; 65 percent; 75 percent; 80 percent; D2; H2; HD; Q-switched pump source; Raman conversion; SRS; first Stokes wavelengths; frequency shifts; initially generated Stokes light; lens; linewidth data; maximum efficiency; molecular hydrogen isotopes; nonlinear techniques; optimum gas pressures; population statistics; pump focusing; relative thresholds; single pass conversion efficiencies; specific wavelengths; steady-state gains; stimulated rotational Raman conversion; system applications; Diodes; High definition video; Hydrogen; Laser excitation; Laser transitions; Neodymium; Pump lasers; Raman scattering; Solid lasers; Stimulated emission;
Journal_Title :
Quantum Electronics, IEEE Journal of
