In:
Laser & Photonics Reviews, Wiley, Vol. 10, No. 5 ( 2016-09), p. 814-825
Abstract:
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. image
Type of Medium:
Online Resource
ISSN:
1863-8880
,
1863-8899
DOI:
10.1002/lpor.201600100
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
2266512-2
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