Kazuyoshi Itoh

Learn More
A 38-MHz picosecond Yb-fiber laser is successfully synchronized to a 76-MHz picosecond Ti:sapphire laser with electronic phase comparators and an intra-cavity electro-optic modulator for high-contrast, label-free imaging with stimulated Raman scattering.
Micro-scale, non-invasive, three-dimensional cross-sectional imaging of protein crystals was successfully accomplished using ultra-high resolution optical coherence tomography (UHR-OCT) with low noise, Gaussian like supercontinuum. This technique facilitated visualization of protein crystals even those in medium that also contained substantial amounts of(More)
In this paper, we report on the refractive index changes and vacancies that are induced in silica glass by the irradiation of ultrashort laser pulses. We fabricated waveguides, couplers, and gratings by the filamentation of femtosecond laser pulses. We demonstrate the formation and the movement of sub-micrometer or nanometer vacancies, called voids. We show(More)
SUMMARY We propose and demonstrate the all-optical analog-to-digital conversion (ADC) using optical delay line encoders. Experimental results show that input analog signals are successfully converted into 3-bit digital signals at a bit rate of 40 Gb/s. key words: all-optical analog to digital conversion, self-frequency shift, optical quantization, optical(More)