Investigation of spectrally-dependent phonon relaxation mechanism in Yb:YAG gain media and its consequences for thin disk laser performance

0525181 - FZÚ 2021 RIV GB eng J - Journal Article
Severová, Patricie - Nagisetty, Siva S. - Chyla, Michal - Miura, Taisuke - Endo, Akira - Smrž, Martin - Mocek, Tomáš
Investigation of spectrally-dependent phonon relaxation mechanism in Yb:YAG gain media and its consequences for thin disk laser performance.
Laser Physics. Roč. 30, č. 2 (2020), s. 1-8, č. článku 025005. ISSN 1054-660X. E-ISSN 1555-6611
R&D Projects: GA MŠMT EF15_006/0000674; GA MŠMT LO1602; GA MŠMT LM2015086
EU Projects: European Commission(XE) 739573 - HiLASE CoE
Grant - others:OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
Institutional support: RVO:68378271
Keywords : Yb:YAG * thin disks and slabs * high-power laser diode pumping
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.366, year: 2020
Method of publishing: Open access

Nonlinear phonon relaxation in Yb:YAG gain media has previously been investigated, and a hypothesis correlating photo-induced free electrons and heat generation in crystals pumped at a wavelength of 940 nm was established (Brandt et al 2011 Appl. Phys. B 102 765–8). Later, we demonstrated efficient suppression of nonlinear phonon relaxation by zero-phonon line (ZPL) pumping of Yb:YAG (969 nm). However, no hypothesis has yet been tested that correlates the heat load and the free electrons in Yb:YAG media. We investigate, both theoretically and experimentally, the behaviour of an Yb:YAG slab pumped by a high-power laser diode at a conventional broadband line (absorption maximum at 941 nm) and a ZPL (absorption maximum at 969 nm), and we compare the generated photocurrent, temperature, and absorbed pump power for those two pump wavelengths.

Permanent Link: http://hdl.handle.net/11104/0309378