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Fabrication processes for periodically inverted AlGaAs and AlGaP waveguides have been developed and used for fabrication of quasi-phase-matched wavelength conversion devices. We have succeeded in achieving considerably high conversion efficiencies in AlGaAs-based devices and the first observation of a quasi-phase-matched parametric interaction in a GaP-based device.
GaP is an attractive material for quadratic nonlinear optical devices because of its large nonlinearity, wide transparency range in infrared region, high thermal conductivity and potential for monolithic integration with electronic/photonic semiconductor devices. Very small two-photon absorption coefficient (0.01 cm/GW at 1.064 mum) compared to that of GaAs (25 cm/GW at 1.064 mum) will open up high-power...
The 850nm single-mode oxide-confined VCSEL with a metal aperture as a spatial mode filter is reported. The OPTALO (optical probing technique for AlAs lateral oxidation) process was adopted to manufacture a small oxide aperture in VCSEL with high reproducibility. The combination of a metal-aperture and an oxide-aperture brought good performance to 850nm single-mode VCSEL. The fundamental transverse...
In this paper, the authors propose a spin-photodiode (spin-PD) that can convert directly the magnitude of circular polarization of incident light into an electric analog signal. This novel device makes it possible to simplify the optical system based on circularly polarized light, such as the optical-chirality detection for organic compounds and stress detection in the solid objects. We show experimentally...
Transverse mode control by etching depth tuning is demonstration from long wavelength (1120 nm) photonics-crystal vertical-cavity surface-emitting lasers. The non-degenerate single-transverse mode was obtained in 12 /spl sim/ 18-pair-etched PC-VCSELs over the entire operating current range.
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