Generation of femtosecond laser pulses at 263 nm by K ₃ B ₆ O ₁₀ Cl crysta ^*

Abstract

The third harmonic generation (THG) of a linear cavity Ti:sapphire regenerative amplifier by use of a K 3 B 6 O 10 Cl (KBOC) crystal is studied for the first time. Output power up to 5.9 mW is obtained at a central wavelength of 263 nm, corresponding to a conversion efficiency of 4.5% to the second harmonic power. Our results show a tremendous potential for nonlinear frequency conversion into the deep ultraviolet range with the new crystal and the output laser power can be further improved.

Recent advances in rational structure design for nonlinear optical crystals: leveraging advantageous templates

“…A UV pulse of 83 fs at 396 nm with a maximum output power of ∼ 220 mW was achieved in a 1-mm-long KBOC crystal, corresponding to the highest conversion efficiency of 39.3%. 182 The following year, the femtosecond third harmonic generation (THG) of KBOC crystals was investigated, and a laser power of up to 5.9 mW and a conversion efficiency of 4.5% were achieved at 263 nm with a 1-mm-long KBOC crystal 183 (Fig. 18e).…”

High-power ultraviolet 278-nm laser from fourth-harmonic generation of an Nd:YAG amplifier in CsB 3 O 5 crystal

“…So far, the most effective approach to achieving UV lasing between 275 and 300 nm is based on fourth-harmonic generation (FHG) from a near-infrared solid state fundamental laser with a wavelength between 1100 nm and 1200 nm by means of nonlinear optical (NLO) crystals. This has resulted in the rapid development of high-quality NLO crystals such as β -Ba 2 B 2 O 4 (BBO), [4] LiB 3 O 5 (LBO), [5] CsB 3 O 5 (CBO), [6,7] CsLiB 6 O 10 (CLBO), [8] K 3 B 6 O 10 Cl (KBOC), [9] etc. Based on these UV NLO crystals, significant progress has been made in this field over the past decade.…”