INJECTION SEEDING FOR SINGLE-MODE OPERATION IN AN OPTICALLY PUMPED HIGH-POWER D2O LASER

Spectrally narrow, pulsed outputs consisting of almost a single mode h ave been obtained from an optically-pumped high-power (200 kW) D2O las er by adopting the injection seeding method, where single-mode radiati on (seed pulse) from a low-power, compact D2O laser has been injected into the main D2O laser. Spectrally narrow outputs with high power hav ing spectral widths as narrow as 5 MHz have been obtained, when the se ed pulses with frequency tuned to one longitudinal mode of the main D2 O laser have been injected at a time sufficiently before the lasing of the main laser took place. The experimental results have been compare d with those of numerical simulation modified to include the injection field with varying injection times.