Nonlinear optic effects allow realization of squeezed light generation and twin photon generation, and implementation of highly efficient devices is expected by integration using waveguide structures. Integrated semiconductor lasers with appropriate design offer possibility of implementing sub-Poissonic light generation, and can be used as pumping sources for nonlinear optic devices. They are important elementary functions for quantum information processing.
The research work will be performed by developing the previous work of us from the quantum optics point of view. International collaboration by researcher exchange will be incorporated. Possibility of future applications will be explored through theoretical analysis and design of several specific devices, establishment of fabrication techniques, and experimental evaluation.
The research work in 2002 is performed with emphasis of on theoretical analysis, establishment of fabrication techniques for prototypes of waveguide nonlinear optic devices and integrated semiconductor lasers. Nonlinear optic devices are being fabricated by forming periodic structures for phase matching and waveguides for field confinement in LiNbO3 crystal. Generation of squeezed light (with quantum noise below the standard quantum limit) and twin photons (temporally correlated photons) will be experimentally studied. High-performance semiconductor lasers will be fabricated by forming waveguides and curved-gratings using InGaAs quantum well structures, and generation of sub-Poissonic light (with intensity noise below the standard quantum limit) by wideband constant current driving will be experimentally studied.
