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Non-centrosymmetric tetragonal Sr2ZnGe2O7 – a novel melilite-type nonlinear-laser crystal offering χ(2)-, χ(3)-, and cascaded χ(3) ↔ χ(2)-interactions

✍ Scribed by P. Becker; L. Bohatý; J. Liebertz; H.-J. Kleebe; M. Müller; H.J. Eichler; H. Rhee; J. Hanuza; A.A. Kaminskii

Book ID
102926224
Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
961 KB
Volume
7
Category
Article
ISSN
1612-2011

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✦ Synopsis

Nonlinear optical interactions based on χ (2) and χ (3) effects were investigated in the tetragonal, non-centrosymmetric melilite-type crystal Sr2ZnGe2O7. Among them are Stokes and anti-Stokes lasing comb generation, SHG, THG, SFG, and cascaded χ (3) ↔ χ (2) self-frequency conversion, arising from onemicron picosecond pumping. All lasing components were identified and attributed to a single SRS-promoting vibration mode ω SRS ≈ 778 cm -1 . The crystals possess a wide transparency range from ≈ 0.25 μm to ≈ 6.2 μm; their refractive indices show a small birefringence (with an isoindex point at 0.4677 μm wavelength) that does not allow phase matching for χ (2) -based conversion processes. Ge Ge O2 O2 O1 O3 O3 O3 O3

The fully symmetric A 1 (ν s )-vibration mode of the two [GeO 3 ] parts of the [Ge2O7] group

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