Abstract
The sequential excitation of LiF crystals with F −2 color centers and KGd(WO4)2 crystals by 1047-nm laser pulses with a duration of 22 ps is investigated. Broadband (275 cm−1) Stokes superluminescence appearing in the fluoride crystal undergoes nonstationary Raman amplification in the oxide crystal. The amplified pulses with a Stokes frequency shift of 767 cm−1, a duration of 7 ps, and a power up to ∼1.1 MW have high spatial and time coherence and exhibit time delay increasing from ∼1 to 4.5 ns with a decreasing pump power. The results are discussed in terms of the cooperative Raman scattering.
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Original Russian Text © A.Ya. Karasik, D.S. Chunaev, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 7, pp. 393–396.
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Karasik, A.Y., Chunaev, D.S. Nonstationary Raman amplification of superluminescence in crystals. Jetp Lett. 85, 315–318 (2007). https://doi.org/10.1134/S0021364007070028
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DOI: https://doi.org/10.1134/S0021364007070028