Open AccessNew observations on DUV radiation at 257 nm and 206 nm produced by a picosecond diode pumped thin-disk laser
Author(s) -
Hana Turčičová,
Ondřej Novák,
Lukáš Roškot,
Martin Smrž,
Jiří Mužík,
Michał Chyła,
Akira Endo,
Tomáš Mocek
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.024286
Subject(s) - optics , picosecond , materials science , laser , diode , harmonics , optoelectronics , phase matching , energy conversion efficiency , physics , voltage , quantum mechanics
We report new observations on picosecond deep ultraviolet coherent beams generated in a CLBO as the fourth and fifth harmonics of a diode pumped high average power Yb:YAG thin disk laser operating at 77 kHz repetition rate at 1030 nm. The effects of the two-photon absorption were observed, e.g. the modification of phase matching conditions, lowering of the conversion efficiency. The fifth harmonic generation (4ω+1ω) was studied for different time delays between both pump beams and for the case of excess input power of the fundamental. The latter effect suggests a possibility of increasing DUV output at short crystals. The highest output power obtained at 257 nm was 7.6 W and 1 W at 206 nm. To our knowledge these DUV output powers rank among the highest for picosecond pulses at the repetition rate of the order of magnitude of 100 kHz.