Tomohiro Imahoko

Generation of all-solid-state, high-power continuous-wave 213-nm light based on sum-frequency mixing in CsLiB6O10.

Achievement of more than 100 mW of pure continuous-wave deep-ultraviolet radiation at 213 nm has been demonstrated in an efficient all-solid-state laser system that uses two Brewster-cut CsLiB6O10 (CLBO) crystals. The first crystal is used for 266-nm generation by external resonant doubling of 532-nm radiation from a frequency-doubled Nd:YVO4 laser. Subsequent sum-frequency mixing is performed in a second CLBO crystal placed in a diode-pumped Nd:YAG laser cavity to mix the single-pass 266-nm output with circulating 1064-nm light.

Kerr lens mode-locked Yb:Lu2O3 bulk ceramic oscillator pumped by a multimode laser diode

We report a Kerr lens mode-locked Yb:Lu₂O₃ ceramic oscillator with a pulse energy of 23.5 nJ, which is the highest value in bulk Yb:Lu₂O₃ ceramic oscillators, to the best of our knowledge.

High-Pulse-Energy Yb:YAG Thin Disk Mode-Locked Oscillator for Intra-Cavity High Harmonic Generation

We have generated 1-mJ pulses with a pulse duration of 520 fs at a repetition rate of 2.85 MHz in a mode-locked oscillator cavity. These pulses can be used for generating high-harmonics in the cavity.

Kerr lens mode-locked Yb:Lu 2 O 3 ceramic oscillator pumped by a multimode laser diode

We report a Kerr lens mode-locked Yb:Lu 2 O 3 ceramic oscillator with a pulse energy of 23.5 nJ, which is the highest value in bulk Yb:Lu 2 O 3 ceramic oscillators, to the best of our knowledge.

50 kHz, 62μJ femtosecond pulse SHG at 389 nm from a single stage Ti:sapphire regenerative amplifier

We have demonstrated the second harmonic generation with output pulses of a 50 kHz Ti:sapphire regenerative amplifier. 280 fs pulses with an average power of 3.1 W were generated at 389 nm.

200 kHz, 73 W highly stable Yb:YAG thin disk green laser

As a pump laser of a Ti:sapphire femtosecond laser, the authors developed high power, high repetition rate and highly stable Yb:YAG thin disk green laser. We achieved 200 kHz, 73 W operation.

Advanced femtosecond lasers in Manufacturing

We solved the stability, life-time and cost problems of femtosecond lasers and opened the door to their huge commercial market in near future. Femtosecond lasers will be used in the semiconductor and LCD manufacturing factory

Tunable femtosecond high power mid-infrared laser pulses

We report a mid-infrared (MIR) optical pulse source (6-12 mum), which is constructed by a regenerative amplifier and an OPA followed by a DFG unit. The maximum pulse energy at 6.8 mum is near 4 muJ

Development of a stable, high-repetition rate, 1W femtosecond regenerative amplifier system for biomedical applications

We have developed a high-repetition, 1-W, and 70 fs regenerative amplifier system. The stable operation was obtained due to a seeding fiber laser, a compact folded cavity, and a green pump source built by ourselves.

10,000-hour maintenance-free operation of 1-W femtosecond laser for industrial applications

We demonstrated stable operation of the femtosecond laser continuously over 10,000 hours only with compensation of power loss of LDs.