2.8 μm laser pumped type I and type II travelling-wave optical parametric generator in GaSe

Ultrashort pulses of a mode-locked Er:Cr:YSGG laser ( λ=2.8 μm) were used to pump travelling wave optical parametric generator (OPG) based on GaSe crystal. Type II wave synchronism OPG was achieved for the first time, giving continuous tunability in the range of 3.9–10 μm and a typical linewidth of...

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Bibliographic Details
Published in:Optics communications 1995-02, Vol.114 (3), p.333-335
Main Authors: Vodopyanov, K.L., Voevodin, V.G.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Frequency conversion
harmonic generation, including high-order harmonic generation
Fundamental areas of phenomenology (including applications)
Harmonic generation, frequency conversion
Nonlinear optics
Optics
Physics
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Summary:Ultrashort pulses of a mode-locked Er:Cr:YSGG laser ( λ=2.8 μm) were used to pump travelling wave optical parametric generator (OPG) based on GaSe crystal. Type II wave synchronism OPG was achieved for the first time, giving continuous tunability in the range of 3.9–10 μm and a typical linewidth of 20–30 cm −1. Type I parametric generation was characterized by a broader line, especially near degeneracy, where the linewidth reached 650 cm −1, and broader tunability, in the range of 3.5–14 μm. For a 10 mm long GaSe crystal travelling OPG pump threshold was 4 GW/cm 2.
ISSN:0030-4018
1873-0310
DOI:10.1016/0030-4018(94)00568-F