Nonstationary Raman amplification of superluminescence in crystals

The sequential excitation of LiF crystals with F2− 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....

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Bibliographic Details
Published in:JETP letters 2007-06, Vol.85 (7), p.315-318
Main Authors: Karasik, A. Ya, Chunaev, D. S.
Format: Article
Language:English
Subjects:
Amplification
Broadband
Color centers
Crystals
Frequency shift
Lithium fluoride
Raman spectra
Time lag
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Summary:The sequential excitation of LiF crystals with F2− 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.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364007070028