Mode-locked CO laser frequency doubling in ZnGeP2 with 25% efficiency

✍ Scribed by A.A. Ionin; J. Guo; L.-M. Zhang; J.-J. Xie; Yu.M. Andreev; I.O. Kinyaevsky; Yu.M. Klimachev; A.Yu. Kozlov; A.A. Kotkov; G.V. Lanskii; A.N. Morozov; V.V. Zuev; A.Yu. Gerasimov; S.M. Grigoryants

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 123 KB
• Volume: 8
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.201110064

✦ Synopsis

Frequency doubling of mode-locked frequencytunable CO laser emission in high quality 17-mm long ZnGeP2 nonlinear optical crystal was studied. The internal efficiency of frequency doubling exceeded 25%, which was obtained by stabilization of mode-locking regime and increasing peak power of pump radiation in the scheme "master oscillator -power amplifier". A feasibility of difference frequency conversion of both fundamental and first overtone CO laser lines to cover ∼ 4.0 -5.0 μm spectral range and a possibility of getting spectral range of ∼ 1.25 -10 μm by mixing of all CO laser lines were estimated.

E, mJ

K int , % 30 10 20 0 70 60 50 20 10 40 30 0

L = 1.1 cm L = 0.9 cm L = 0.6 cm Free-running L = 0.6 cm Internal efficiency of SHG in ZnGeP2 crystal versus pump energy when the nonlinear crystal after focal plate. CO Laser transition 9→8 P(10) (λ ≈ 5.274 μm)