Abstract
We study experimentally the behavior of the spectrum shape and Stokes frequency shift of stimulated Brillouin scattering (SRS)-compressed radiation within a broad range of incident-laser-pulse intensities from the threshold up to eight times the threshold values. We show that, at pulse compression of reflected radiation to subnanosecond durations (smaller than inverse spontaneous line widths), its spectrum monotonously shifts with increase in the exciting light intensity such that its Stokes shift decreases. At intensities increasing four times the threshold, the spectrum splits and acquires a twohumped shape, which is explained by the phase modulation near the SBS resonance. We construct an analytical model of self-phase modulation in SBS compression, describing the spectral splitting and chirping formation.
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Erokhin, A.I., Smetanin, I.V. Experimental and theoretical study of self-phase modulation in sbs compression of high-power laser pulses. J Russ Laser Res 31, 452–461 (2010). https://doi.org/10.1007/s10946-010-9166-y
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DOI: https://doi.org/10.1007/s10946-010-9166-y