New observations on DUV radiation at 257â
nm and 206â
nm produced by a picosecond diode pumped thin-disk laser.
Opt Express
; 27(17): 24286-24299, 2019 Aug 19.
Article
em En
| MEDLINE
| ID: mdl-31510320
ABSTRACT
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 YbYAG thin disk laser operating at 77 kHz repetition rate at 1030â
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 257â
nm was 7.6 W and 1 W at 206â
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.
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MEDLINE
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En
Ano de publicação:
2019
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Article