Coherent light generators – Particular beam control device – Nonlinear device
Reexamination Certificate
2008-03-04
2008-03-04
Nguyen, Dung T. (Department: 2828)
Coherent light generators
Particular beam control device
Nonlinear device
C372S022000, C372S064000, C372S075000
Reexamination Certificate
active
07339960
ABSTRACT:
After forming domain inverted layers3in an LiTaO3substrate1, an optical waveguide is formed. By performing low-temperature annealing for the optical wavelength conversion element thus formed, a stable proton exchange layer8is formed, where an increase in refractive index generated during high-temperature annealing is lowered, thereby providing a stable optical wavelength conversion element. Thus, the phase-matched wavelength becomes constant, and variation in harmonic wave output is eliminated. Consequently, with respect to an optical wavelength conversion element utilizing a non-linear optical effect, a highly reliable element is provided.
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Ahlfeldt, H., et al., “Postfabrication Changes and Dependence on Hydrogen Concentration of the Refractive Index of Proton-Exchanged Lithium Tantalate Waveguides”, pp. 717-727 (Jan. 15, 1994).
Kato Makoto
Kitaoka Yasuo
Mizuuchi Kiminori
Yamamoto Kazuhisa
Matsushita Electric - Industrial Co., Ltd.
Nguyen Dung T.
RatnerPrestia
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