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Stimulated Raman scattering in natural crystals of fluorapatite, Ca 5 (PO 4 ) 3 F
Author(s) -
Kaminskii Alexander A.,
Bohatý Ladislav,
Lux Oliver,
Rhee Hanjo,
Eichler Hans Joachim,
Libowitzky Eugen,
Kleinschrodt Reiner,
Yoneda Hitoki,
Shirakawa Akira,
Becker Petra
Publication year - 2016
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201600100
Subject(s) - raman spectroscopy , raman scattering , fluorapatite , crystal (programming language) , materials science , infrared , picosecond , wavelength , optics , analytical chemistry (journal) , molecular physics , chemistry , laser , mineralogy , optoelectronics , physics , chromatography , computer science , apatite , programming language
Hexagonal Ca 5 (PO 4 ) 3 F, known as natural crystal fluorapatite and oldest host‐crystal for Ln 3+ ‐lasant ions, is presented as a Raman‐active material. High‐order Raman‐induced χ (3) ‐nonlinear processes are discovered in natural crystals of fluorapatite under picosecond pumping at 1.064 μm and 0.532 μm wavelength. A multitude of Stokes and anti‐Stokes components is generated in the ultraviolet, visible and near‐infrared spectral region by stimulated Raman scattering (SRS) and Raman four‐wave mixing (FWHM), resulting in a frequency comb with a width of 520 THz. The spectral lines are identified and attributed to the ν 1 (A g ) vibration mode of the tetrahedral [PO 4 ] units which is related to a Raman shift of ω SRS ≈ 965 cm −1 . The first Stokes steady‐state Raman gain coefficient in the near‐infrared spectral range is estimated to be >0.38 cm·GW −1 . Finally, a short review of SRS‐promoting vibration modes and observed χ (3) ‐ nonlinear interactions in all known SRS‐active natural crystals (minerals) is given.