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We have developed a sub-two-cycle intense infrared light source using novel BiB3O6 (BIBO)-based optical parametric amplifiers for the generation of high harmonics in soft X rays. The cutoff of high harmonics has extended to ∼320 eV, which is well beyond the carbon K edge. The spectral structures and their dependences on the carrier-envelope phase strongly suggest the generation of single isolated...
We developed an ultra-broadband all-optical frequency multiplexing technique on a single optical carrier using cross-phase modulation in nonlinear fibers, and demonstrated sequentially multiplex of multi-channel Gigabit ASK/DPSK signals on THz-band.
All-optical combination of 160-Gb/s DPSK and OOK signals into a 320-Gb/s DQPSK signal is demonstrated using highly-nonlinear fibers. A polarization-insensitive optical parametric limiter enabled error-free combination operation midway in a 200 km fiber link.
We generated high harmonics using a multi-millijoule few-cycle carrier-envelope-phase-locked optical parametric chirped-pulse amplification (OPCPA) system. We observed the high harmonics in the water window and the carrier-envelope phase (CEP) effect on the harmonic spectra.
We demonstrate an optical parametric chirped-pulse amplification (OPCPA) system with the pulse energy of 1.2 mJ at a 1 -kHz repetition rate, and its spectrum is broad enough toward a few-cycle regime.
Isolated XUV pulses with a temporal duration of 950 as were characterized by the autocorrelation technique based on two-photon above threshold ionization.
The phase matching angles for second harmonic generation in KBBF have been determined from 194 to 170 nm. The wavelength of 160 nm generated by the 5th harmonic is the shortest ever obtained by nonlinear crystals.
Possible applications of nonlinear fibers to all-optical signal processing are described. Ultra-broad band/ultra-fast optical signal processing using four-wave mixing, cross-phase modulation and supercontinuum light generation in nonlinear fibers will be essential technologies for future photonic networks.
A semiconductor based all-optical sampling system is demonstrated for the first time to measure a 320 Gb/s optical eye diagram. The system incorporates a gain-transparent ultrafast-nonlinear interferometer as sampling gate
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