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SRS in di‐glycine nitrate (NH 2 CH 2 COOH) 2 · HNO 3 crystals: Observation of high‐gain many‐phonon nonlinear interactions
Author(s) -
Kaminskii Alexander A.,
Lux Oliver,
Haussühl Eiken,
Rhee Hanjo,
Haussühl Siegfried,
Eichler Hans Joachim,
Yoneda Hitoki,
Shirakawa Akira,
Ueda Kenichi,
Hanuza Jerzy
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248273
Subject(s) - raman spectroscopy , picosecond , raman scattering , lasing threshold , phonon , crystal (programming language) , excited state , nonlinear optics , raman laser , materials science , analytical chemistry (journal) , laser , wavelength , chemistry , molecular physics , atomic physics , optics , physics , optoelectronics , condensed matter physics , chromatography , computer science , programming language
Efficient high‐gain many‐phonon steady‐state stimulated Raman scattering (SRS) was excited in the novel χ (3) ‐active organic crystal of di‐glycine nitrate (DGN), (NH 2 CH 2 COOH) 2 · HNO 3 , at room temperature under picosecond laser pumping in the visible and near‐IR regions. Besides high‐order Stokes and anti‐Stokes (comb) generation in this centrosymmetric crystal, several cascaded and cross‐cascaded χ (3) ↔ χ (3) nonlinear photon–phonon interactions were observed. The recorded Raman‐induced lasing wavelengths were identified and attributed to the SRS‐promoting optical vibration modes ω SRS1 ≈ 1058 cm −1 , ω SRS2 ≈ 2985 cm −1 , ω SRS3 ≈ 895 cm −1 , and ω SRS4 ≈ 3000 cm −1 . The measured large Raman frequency shifts (≈3000 cm −1 ) and estimated moderately high steady‐state Raman gain coefficients ( $g_{{\rm ssR}}^{{\rm St}_{1} } $ ≥ 6.5 cm · GW −1 ) make this DGN crystal attractive for a number of new applications in modern laser physics and nonlinear optics.