Abstract
Random lasing in Raman active material – barium nitrate powder – has been registered in two temporal regimes: nanosecond and picosecond. Stimulated Raman scattering (SRS) in Ba(NO3)2 for picosecond excitation has been shown to have much lower threshold and spectrum containing more components than for nanosecond excitation opposite to the case of a bulk medium. In picosecond regime SRS intensity increased with temperature decreasing and redistributed in favor of the higher order components. SRS pulse duration in picosecond regime was estimated to be in the range 16.5-22 ps. High conversion efficiency of SRS in barium nitrate powder in picosecond regime and its larger stability under laser impact than for bulk samples gives possibility to use it as an active material in Raman converters.
Highlights
Random lasing (RL) effect was for the first time described by Letokhov [1] in 1968
Raman random laser is a special case of random laser, which uses stimulated Raman scattering (SRS) as a gain source [9, 10]
3.Conclusions In our work we showed that SRS in Ba(NO3)2 powder can be excited both by nanosecond and picosecond laser pulses
Summary
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