Phase evolution of nanosecond laser pulses in dye amplifiers and second-harmonic generation
Using an optical heterodyning technique, we have investigated frequency shifts and chirps of pulse-amplified single-mode cw lasers for both transversely pumped and capillary-type dye amplifier cells. For transversely pumped dye cells, the instantaneous frequency varies with alignment, by as much as 40 MHz at some times during the pulse. However, capillary-type dye cells show a remarkable degree of repeatability. The frequency evolution ranges over tens of MHz but is stable with alignment to within 2 MHz. The phase evolution of pulsed second-harmonic radiation generated in KDP was also investigated. For pulses obtained using transversely pumped dye cells, significant deviations from the predicted pulse shape and frequency evolution are observed as the second harmonic conversion efficiency approaches saturation. However, for pulses obtained from capillary-type dye cells preliminary results show a much better match between the uv pulses and the predicted ones.
- OSTI ID:
- 281342
- Report Number(s):
- CONF-9305421-; ISSN 0003-0503; TRN: 96:019268
- Journal Information:
- Bulletin of the American Physical Society, Vol. 38, Issue 3; Conference: 1993 American Physical Society annual meeting on atomic, molecular, and topical physics, Reno, NV (United States), 16-19 May 1993; Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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