Hajime Nishioka

Tunable Continuous-Wave Yb:YLF Laser Operation with a Diode-Pumped Chirped-Pulse Amplification System.

We have demonstrated a diode-pumped Yb:LiYF(4) (Yb:YLF) laser oscillator for the first time to our knowledge. A wide tuning range of 25 nm and a high slope efficiency of 50% were obtained at a high laser-diode pump intensity of 100 kW/cm(2). Emission and absorption spectra of the Yb:YLF crystal at 8 K represent a wide laser gain width of 38 nm, indicating efficient laser operation similar to that of a four-level laser system with a reduced saturation fluence of 11 J/cm(2).

Femtosecond continuously tunable second harmonic generation over the entire-visible range in orthorhombic acentric Gd2(MoO4)3 crystals

Second harmonic generation over the entire visible range in Nd3+ doped and undoped Gd2(MoO4)3 crystals under ultrashort hypercontinuum pumping is presented. The continuous tuning ranges from 487 to 790 nm in a single crystal.

Ultra-Broadband Optical Parametric Chirped-Pulse Amplification Using a Cryogenic-Cooled Yb:YLF Pump Laser

We have demonstrated ultra-broadband optical parametric chirped-pulse amplification of more than 500-nm bandwidth pumped by a diode-pumped, cryogenic-cooled Yb:YLF chirped-pulse amplification laser.

Intense Few-Cycle Optical Parametric Chirped-Pulse Amplifier Pumped by a Cryogenically-Cooled Yb-Doped Solid-State Chirped-Pulse Amplification Laser

We report a terawatt-class few-cycle OPCPA system with an ultra-broad bandwidth of over 400 nm pumped by double broadband pump pulses delivered from an Yb-doped solid-state CPA laser cooled to liquid nitrogen temperatures.

Femtosecond pulse encoding and self phase-reconstruction by a two-photon-recorded single-tip diffractive optics

A new scheme for femtosecond pulse recording, time-reversed playback, and self-pulse recompression in a single-tip diffractive device was proposed. Self-pulse regeneration has been demonstrated with a two-photon recorded glass tip.

Diode-pumped Yb:LiYF 4 chirped-pulse regenerative amplifier for high average power operation

A 10 mJ output power was obtained by using a diode-pumped chirped-pulse regenerative amplifier with a liquid-nitrogen cooled Yb:LiYF4 crystal. The pump duration as short as 1 ms would enable 1 kHz repetition rate with a continuous wave pump. The pulse duration compressed in time by parallel grating pair was about 800 fs with 6 mJ output power.