Shinichi Matsubara

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The 13th harmonic of a Ti:sapphire (Ti:S) laser in the plateau region was injected as a seeding source to a 250-MeV free-electron-laser (FEL) amplifier. When the amplification conditions were fulfilled, strong enhancement of the radiation intensity by a factor of 650 was observed. The random and uncontrollable spikes, which appeared in the spectra of the(More)
One-hundred-ten-fs and 72-fs pulse-widths were obtained directly from a mode-locked Yb:YAG laser with SESAM and without SESAM, respectively. The laser-spectrum-center and the fluorescence-center were almost same. The oscillation-spectra were much broader than the fluorescence. In recent years, there has been great interest in mode-locked lasers with high(More)
A 2 x 21.5-22.3 Gb/s to 4 x 10.7-11.2 Gb/s SFI5.2 compliant two-chip SerDes for a 40 Gb/s optical transponder module has been fabricated in 65 nm 12-metal CMOS. The deserializer receives 2 x 20 Gb/s data from a TIA and outputs SFI 5.2 4 x 10 Gb/s data and 10 Gb/s deskew channel. The serializer receives SFI5.2 inputs and outputs 2 x 20 Gb/s for the optical(More)
— We developed a laser-diode (LD)-pumped cavity-dumped ytterbium-doped yttrium aluminum garnet (Yb:YAG) laser. The slope efficiency and optical-to-optical conversion efficiency were 72% and 56%, respectively for an absorbed pump power of 780 mW at a pulse repetition rate of 100 kHz. The pulse width was 15 ns. To our knowledge, the efficiencies are the(More)
Spectral gain narrowing of high-average power, regenerative chirped pulse thin-rod Yb:YAG amplifier was compensated by the regenerative spectral and pulse shaping technique. An average output power of 18 W was achieved at a repetition rate of 100 kHz with an output pulse width of below 1.2 ps. A wide spectral bandwidth of 2.5 nm was also observed. 2009(More)
A high-average power, laser-diode-pumped, picosecond-pulse regenerative chirped pulse amplifier was developed by using the thin-rod Yb:YAG laser architecture. An average output power of 20 W was achieved at a repetition rate of 100 kHz with an output pulse width of 2 ps. 2008 Optical Society of America OCIS codes: (140.3280) Lasers, amplifiers, (140.3615)(More)
— We have developed a single-emitter laser-diode (LD)-pumped cavity-dumped ytterbium-doped yttrium aluminum garnet (Yb:YAG) laser. For an absorbed pump power of 1.98 W, the slope efficiency and the optical-to-optical conversion efficiency were 46.9% and 37.9%, respectively. The absorption efficiency was 82.0%. An average output power of 748 mW and a pulse(More)
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