We describe the use of two-photon absorption in submicron silicon wire waveguides for all-optical switching by cross-absorption modulation. Optical pulses of 3.2 ps were successfully converted from high power pump to low power continuous-wave signal with a fast recovery time. High speed operation was based on the induced optical absorption from non-degenerate two-photon absorption inside the waveguides.
The results of recent research on our implantable CMOS biomedical devices are reviewed. Topics include retinal prosthesis devices and deep-brain implantation devices for small animals. Fundamental device structures and characteristics as well as in vivo experiments are presented.
High-efficiency generation of the third harmonic of 1.55 m light is observed in a periodically poled MgO-doped LiNbO 3 disk resonator. The second harmonic is simultaneously generated. The blue-green emission arises from cascaded parametric processes of second-harmonic and sum-frequency generation by whispering gallery modes. An external conversion efficiency of 1.5%/W 2 is obtained.
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