Efficient second-harmonic generation of ultrashort pulses with simultaneous quasi-phase matching and group velocity matching in periodic 90 degrees domain structures of potassium niobate

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Triple-line-shaped electrodes were devised to fabricate a periodically poled 90 degrees domain structure of KNbO(3) (PP90KN) of 20.25 mu m period with uniform periodicity and reproducibility. Using the fundamental pulse of 141 fs duration at 1619 nm wavelength, an efficient broadband type-I quasi-phase-matched second-harmonic generation was realized in an 8.3 mm long PP90KN by satisfying both phase matching and group-velocity-matching in the telecommunication L-band at room temperature. Second-harmonic pulses showed no significant temporal and spectral distortion and had a pulse duration of about 144 fs, which agreed well with the theoretical value of 142 fs. The conversion efficiency of the second-harmonic generation was 28.7% at the fundamental pulse energy of 0.92 nJ, which is about 60% of the theoretical Value. (C) 2009 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2010-05
Language
English
Article Type
Article
Keywords

2ND HARMONIC-GENERATION; FREQUENCY-CONVERSION; FEMTOSECOND PULSES; POLED KTIOPO4; KNBO3; COMPRESSION; FABRICATION; GRATINGS

Citation

OPTICS COMMUNICATIONS, v.283, no.9, pp.1894 - 1898

ISSN
0030-4018
DOI
10.1016/j.optcom.2009.12.029
URI
http://hdl.handle.net/10203/95127
Appears in Collection
PH-Journal Papers(저널논문)
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