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Tetragonal Ba2MgGe2O7 – a novel multifunctional optical crystal with numerous manifestations of nonlinear-laser effects: almost sesqui-octave Stokes and anti-Stokes combs and cascaded χ(3)↔χ(2) lasing with involved second and third harmonic generation

✍ Scribed by A.A. Kaminskii; L. Bohatý; P. Becker; J. Liebertz; P. Held; H.J. Eichler; H. Rhee; J. Hanuza

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
794 KB
Volume
5
Category
Article
ISSN
1612-2011

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✦ Synopsis

Melilite-type Ba 2 MgGe 2 O 7 was found to be an attractive, simultaneously χ (2) -and χ (3) -active nonlinear optical crystal. Under one-micron picosecond pumping we observed several manifestations of nonlinear interactions, namely almost sesqui-octave Stokes and anti-Stokes lasing combs, collinear and "Cherenkov"-type SHG, THG, SFG, and cascaded selfconversion χ (3) ↔ χ (2) generation in the visible and UV range. All recorded lasing components were identified and attributed to a single SRS-promoting vibration mode ωSRS = 771.5 cm -1 . A short review of melilite-type compounds is given.

The fully symmetrical A 1 -vibration mode of the two (GeO 3 ) groups of the dimer [Ge 2 O 7 ]

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