Scaling Studies on Efficient Raman Converters
Technical rept. 21 Mar 1980-20 Mar 1981
NORTHROP RESEARCH AND TECHNOLOGY CENTER PALOS VERDES PENINSULA CA
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Injection locking performance of a 1 micro set XeF laser pulse and Raman converter scaling have been investigated. Narrowband ultraviolet radiation from a frequency-doubled dye laser has been used to control the linewidth and polarization of a long pulse-length electron beam-excited XeF laser. Linewidths of 0.004 nm have been achieved in the 353 nm band of the XeF B yields X Laser transition. Over 90 of the energy in the free-running laser pulse has been extracted in the narrowband injection-locked pulse. Ratios of injection signal power to output laser power on the order of .00001 are adequate for efficient injection-locking to occur. Efficient Raman conversion of microsecond-pulse, injection-locked XeF 353 nm laser radiation into the blue-green region via the second Stokes shift in hydrogen has been demonstrated using a Raman oscillator- amplifier scheme. Strong depletion of the pump and the first Stokes radiation accompanied by a dominant second Stokes 500 nm output was observed for the first time. Amplifier power conversion efficiency of 43 was achieved along with a blue-green output energy of 1.7 J at an energy efficiency of 34. These data support Raman converter scaling analyses which predict feasibility of efficient XeF-to-blue-green conversion at higher energies.
- Lasers and Masers