Picosecond high-power 355-nm UV generation in CsLiB_6O_10 crystal

Abstract

We report third-harmonic generation (THG) at 355 nm in CsLiB₆O₁₀ (CLBO) by using sum-frequency mixing process. As a fundamental laser source, we employ a hybrid master oscillator power amplifier (MOPA) system seeded by a gain-switched laser diode (GS-LD) at 1064 nm to produce narrow spectral picosecond pulses. Both CLBO and walk-off compensated prism-coupled CLBO device generate over 30-W output of 355-nm UV lights, which means walk-off effect in CLBO is negligible in the picosecond laser system. The maximum THG conversion efficiency from the fundamental reaches about 48%, which is 1.2 times higher than that of LiB₃O₅ (LBO). Theoretical THG outputs with CLBO and LBO are numerically calculated in order to verify the validity of these experimental results in detail.

Borates: A Rich Source for Optical Materials

“…283 Yoshimura et al generated 355 nm UV laser in CsLiB 6 O 10 crystal by the sum frequency process, and the maximum output power of 30.9 W has been achieved from the fundamental source of 64 W at a repetition rate of 300 kHz. 284 The remarkable conversion efficiency of 48.3% could be reached, which is about 1.2 times higher than that using LiB 3 O 5 crystal. Interestingly, a reversible and partial transition to a new modification, β-CsLiB 6 O 10 , was observed during cooling crystalline and moist samples of CsLiB 6 O 10 to −25 °C.…”

“…Yoshimura et al . generated 355 nm UV laser in CsLiB 6 O 10 crystal by the sum frequency process, and the maximum output power of 30.9 W has been achieved from the fundamental source of 64 W at a repetition rate of 300 kHz . The remarkable conversion efficiency of 48.3% could be reached, which is about 1.2 times higher than that using LiB 3 O 5 crystal.…”

High-energy, high-repetition-rate ultraviolet pulses from an efficiency-enhanced, frequency-tripled laser

“…In 2015, 8 ps, 234 W, 343 nm laser pulses were generated by a 300 kHz Yb:YAG thindisk laser and two LBO crystals with a THG conversion efficiency of 32% [11] . In 2016, 37 ps, 30.9 W, 300 kHz laser pulses at 355 nm were obtained using CsLiB 6 O 10 with a THG conversion efficiency of approximately 48% [12] . At a similar time, 1.13 mJ laser pulses at 355 nm with a pulse width of 40 ps were generated on the basis of one KDP crystal with a THG efficiency of 30.7% [13] .…”

β -BaB 2 O 4 with special cut-angle applied to single crystal cascaded third-harmonic generation

“…For the third-harmonic generation (THG) of near infrared laser, traditionally two NLO crystals are necessary: the first is for second-harmonic generation (SHG) and the second is for sum-frequency generation (SFG). [1][2][3][4][5][6] Recently, we developed a cascaded THG apparatus that only uses one NLO crystal. It possesses some advantages such as wide available waveband, high efficiency, and cost saving.…”