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

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10 Author(s)
Nan Ei Yu ; National Institute for Materials Science, 1-1, Namiki, Tsukuba 305-0044, Japan ; Kurimura, Sunao ; Kitamura, Kenji ; Oc-Yeub Jeon
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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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Applied Physics Letters  (Volume:85 ,  Issue: 24 )