Efficient second-harmonic generation of ultrafast pulses in periodically poled KNbO3

Nan Ei Yu; Sunao Kurimura; Kenji Kitamura; Oc-Yeub Jeon; Myoungsik Cha; Satoshi Ashihara; Takayuki Ohta; Tsutomu Shimura; Kazuo Kuroda; Junji Hirohashi
December 2004
Applied Physics Letters;12/13/2004, Vol. 85 Issue 24, p5839
Academic Journal
Efficient second-harmonic generation of 95 fs pulses were achieved by simultaneous group-velocity matching and quasi-phase matching in a 10 mm long periodically poled potassium niobate crystal. The quasi-phase-matched bandwidth was 38 nm and second-harmonic pulse duration was 158 fs with a fundamental input pulse of 95 fs without spectral and temporal distortion in the S-band of telecommunication. Utilizing the larger off-diagonal nonlinear coefficient, d31 of potassium niobate, the conversion efficiency was significantly improved from that of periodically poled MgO-doped lithium niobate. [Appl. Phys. Lett. 82, 3388 (2003)]


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