Abstract
Diffraction limited coherent sources at visible blue-green wavelengths impact numerous applications ranging from optical recording to flat-panel displays. Recent advances on GaN laser and II-VI laser technologies made possible such sources that cover blue, green and even ultra-violet wavelengths. However, difficulties lie in realizing such sources that are reliable and low-threshold. Visible sources based on second-harmonic-generation in perosvkites, such as LiNbO3, LiTaO3, and KTP, are promising, but they require an additional optical coupling with semiconductor lasers. Semiconductor nonlinear optical waveguides are of special interest for realizing an efficient wavelength conversion device monolithically integrated with a semiconductor laser. Typical zincblende semiconductors have much larger nonlinear optical susceptibilities (e.g. χ(2)GaAs= 180pm/V [1]) compared to those of LiNbO3 χ(2)zzz =−68 pm/V [2]). The main difficulty in realizing such a semiconductor wavelength conversion device lies in the phase-matching. Zincblende semiconductors are cubic and there is no intrinsic birefringence that can be used for phase-matching. Quasi-phase-matched3 second-harmonic generation and difference-frequency-generation in periodically domain inverted AlGaAs waveguides have been recently demonstrated4,5. In this paper, we discuss quasi-phase-matched visible green generation in a periodically domain inverted ZnCdSe waveguide grown on an AlGaAs template prepared by wafer bonding6 and epitaxial growth.
© 1996 Optical Society of America
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