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Proceedings Paper

Quasi phase matching through periodic step structure: modeling of frequency conversion in consideration of heat influence
Author(s): Takafumi Ohfuchi; Nobuyuki Hirano; Hiroya Matsukawa; Koichiro Nakayama; Hiroshi Kumagai; Norihiro Inoue; Naoaki Fukuda; Toshio Takiya
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Paper Abstract

Periodic inversion of spontaneous polarization in a ferroelectric substrate has realized quasi phase matching (QPM) and thereby revolutionized nonlinear optics. In this paper, we report on the heat influence on the frequency conversion in birefringence phase matching (BPM) by use of BaB2O4 (BBO) crystals as preparatory for efficient generation of the second harmonics (SHs) by QPM we suggest. Indeed, QPM is achieved normally by polarization inversion, but we suggest the periodic step structure to achieve QPM. Polarization inversion is generally formed by superimposed voltage. However, the shorter wavelength region is, the shorter inversion cycle is. Therefore, if the vacuum ultraviolet (VUV) region is treated, it becomes more difficult to form periodic inversion and the accuracy is more necessary. Accordingly, it is necessary to consider the influence of crystal's heat, caused by absorption of laser, which affects frequency conversion. We discuss validity of analytical approach about crystal's heat and frequency conversion by comparing between both results of experiment and simulation with BBO crystals.

Paper Details

Date Published: 15 February 2012
PDF: 8 pages
Proc. SPIE 8240, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI, 82401P (15 February 2012); doi: 10.1117/12.909526
Show Author Affiliations
Takafumi Ohfuchi, Hitachi Zosen Corp. (Japan)
Nobuyuki Hirano, Osaka City Univ. (Japan)
Hiroya Matsukawa, Osaka City Univ. (Japan)
Koichiro Nakayama, Hitachi Zosen Corp. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)
Norihiro Inoue, Hitachi Zosen Corp. (Japan)
Naoaki Fukuda, Hitachi Zosen Corp. (Japan)
Toshio Takiya, Hitachi Zosen Corp. (Japan)


Published in SPIE Proceedings Vol. 8240:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI
Konstantin L. Vodopyanov, Editor(s)

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