Curent Research Subjects [1] LiNbO3 waveguide nonlinear-optic devices Quasi-phase-matched (QPM) second-harmonic generation (SHG) devices QPM difference-frequency generation (DFG) devices QPM sum-frequency generation (SFG) devices Ferroelectric-domain-inverted structures for QPM LiNbO3 waveguides for NLO devices (proton exchange, Zn-diffusion, ---) Wavelength conversion for WDM photonic network systems High-speed optical sampling and picosecond optical switching Generation of twin photons and quantum entanglement by waveguide devices Ferroelectric-domain-inverted spatial light modulators [2] Semiconductor integrated photonic devices Grating components for semiconductor waveguides Quantum-well DFB/DBR lasers (AlGaAs/GaAs, InGaAs/AlGaAs, AlGaInP/InGaP) Integrated master oscillator power amplifiers (MOPA) with grating coupler Integrated tunable lasers Integrated-photonic sensors Area-selective quantum-well disordering by impurity-free vacancy diffusion Posters of research subjects Quantum Photonic Devices Previous Research Work [1] Outline of Research [2] Research Subjects / [2-1] Microoptics components [2-2] Optical memory [2-3] Optical sensing [2-4] Optical signal processing [2-5] Optical communication [2-6] Nonlinear optic devices [2-7] Waveguide laser and amplifier [3] Facilities