Mingying Sun

By integrating χ(2) optical frequency conversion and χ(3) stimulated Raman scattering (SRS) technology, we demonstrated a new, to the best of our knowledge, deep-UV laser generation scheme near 200 nm in a non-cryogenic KD2PO4 (DKDP) crystal. Based on an Nd:YAG laser (1064 nm, ω1) and cascaded LiB3O5 and DKDP crystals, a 266 nm radiation was obtained firstly by the second- and fourth-harmonic generation (SHG and FHG) (ω4). The energy conversion efficiency from ω1 to ω4 was 24.8%.

Utilizing LiB3O5, β-BaB2O4 crystals, and an Nd:YVO4 laser with an average power of 70 W and a repetition rate of 100 kHz, we systematically demonstrated and operated high-repetition-rate, high-power, all-solid-state, UV, and deep-UV picosecond laser sources via high-efficiency third-, fourth-, and fifth-harmonic generation (THG, FHG, and FiHG).

Abstract We propose a temporally shaped double-picosecond-pulse train at a sub-nanosecond scale to control the damage dynamics of optical glass. Both damage threshold and morphology are significantly modulated by pulse-train shaping. The ramp-up-shaped train effectively increases its damage threshold and decreases the damage density and size, which clearly shows that a pump pulse with optimized fluence has a strong positive modification of damage precursors.