Influence of temperature on Ti: sapphire spectroscopic and laser characteristics

0501861 - FZÚ 2019 RIV GB eng J - Článek v odborném periodiku
Fibrich, Martin - Šulc, J. - Jelínek, M. - Jelínková, H. - Kubeček, V.
Influence of temperature on Ti: sapphire spectroscopic and laser characteristics.
Laser Physics. Roč. 28, č. 8 (2018), s. 1-6, č. článku 085801. ISSN 1054-660X. E-ISSN 1555-6611
Grant CEP: GA MŠMT EF16_019/0000789
Grant ostatní: OP VVV - ADONIS(XE) CZ.02.1.01/0.0/0.0/16_019/0000789
Institucionální podpora: RVO:68378271
Klíčová slova: Ti:sapphire * cryogenic temperature * continuous-wave operation
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 1.231, rok: 2018

We report on the influence of temperature on the spectroscopic and lasing properties of Ti:sapphire (Ti3+ :Al2O3) crystal. The fluorescence lifetime, polarization-resolved absorption and emission spectra, and laser characteristics at  ~750 nm are described in detail within a temperature range of 78–300 K. The cooling of Ti:sapphire crystal down to cryogenic temperatures resulted in dramatic improvement in terms of its laser output power and oscillation threshold. More than two times better results were reached at 78 K when compared with room temperature operation. A continuous output power of 325 mW with a slope efficiency of 24% (related to absorbed pump power) was obtained using 98% output coupler reflectivity at a 750 nm wavelength at cryogenic temperatures. The corresponding oscillation threshold was 580 mW of absorbed pump power.
Trvalý link: http://hdl.handle.net/11104/0293836