Balancing the conversion efficiency and beam quality of second harmonic generation of a two-picosecond Yb:YAG thin-disk laser

0525180 - FZÚ 2021 RIV GB eng J - Článek v odborném periodiku
Duda, Martin - Novák, Ondřej - Chyla, Michal - Smrž, Martin - Mocek, Tomáš
Balancing the conversion efficiency and beam quality of second harmonic generation of a two-picosecond Yb:YAG thin-disk laser.
Laser Physics. Roč. 30, č. 2 (2020), s. 1-5, č. článku 025405. ISSN 1054-660X. E-ISSN 1555-6611
Grant CEP: GA MŠMT EF15_006/0000674; GA MŠMT LO1602; GA MŠMT LM2015086
GRANT EU: European Commission(XE) 739573 - HiLASE CoE
Grant ostatní: OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
Institucionální podpora: RVO:68378271
Klíčová slova: harmonic generation * ultrafast lasers * thin disk lasers * back-conversion
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 1.366, rok: 2020
Způsob publikování: Open access

In this work, the optimization of the second harmonic generation in an LiB3O5 crystal of the 1 kHz, 2 ps Yb:YAG laser is being investigated. Depending on the crystal thickness, an optimal intensity exists, above which the back-conversion process negatively affects the beam quality and pulse shape, while decreasing conversion efficiency. For a selected 2 mm thick frequency doubling crystal, the conversion efficiency of 80% at an optimal intensity of 120 GW cm−2 has been achieved, with output pulse duration of 1.3 ps and with beam quality of 1.4 and 1.6 in a horizontal and vertical direction, respectively, which is only slightly worse than the beam quality at a fundamental frequency.
Trvalý link: http://hdl.handle.net/11104/0309377