Passively Q-switched Er,La:SrF2-CaF2 Laser at 2.74 μm

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F19%3A00334044" target="_blank" >RIV/68407700:21340/19:00334044 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1117/12.2520268" target="_blank" >http://dx.doi.org/10.1117/12.2520268</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2520268" target="_blank" >10.1117/12.2520268</a>

Result language
angličtina
Original language name
Passively Q-switched Er,La:SrF2-CaF2 Laser at 2.74 μm
Original language description
The free-running and passive Q-switched laser properties of Er,La:SrF2-CaF2 crystal, that is appropriate for generation at 2.74 μm, are presented. The sample of Er,La:SrF2-CaF2 (composition 4 wt.% of ErF3, 12 wt.% of LaF3, 77 wt.% of CaF2, and 7 wt.% of SrF2, thickness 8.2 mm) had plan-parallel polished faces without anti-reflection coatings. The excitation of Er,La:SrF2-CaF2 was carried out by a 975 nm laser diode radiation in pulsed (pulse duration 1 ms, repetition rate 10 Hz) and CW mode. Laser resonator was hemispherical, 10 mm or 45 mm in length with flat pumping mirror (HR @ 2.7 μm) and spherical output coupler (r = 50 mm, R = 97.5 % or R = 95 % @ 2.5-2.8 μm). For CW mode of operation of Er,La:SrF2-CaF2 the highest obtained slope efficiency was 20.2 %. The maximum output power 0.35 W was achieved in this case. With semiconductor saturable absorber (SESAM) in laser resonator the shortest pulse duration of 33.4 ns with repetition rate 50 kHz was obtained. The maximal pulse energy 5.4 μJ with peak power 122 W was reached for 44.2 ns pulse duration. Since the emitted laser wavelength 2.74 μm is relatively close to absorption peak of water located at 3 μm, one of the Er,La:SrF2-CaF2 laser possible usage should be in medicine and spectroscopy.
Czech name
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Czech description
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Project
<a href="/en/project/GA18-11954S" target="_blank" >GA18-11954S: Optimization of the solid-state laser active materials for spectral range from near- up to mid-infrared</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proc. SPIE 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV
ISBN
978-1-5106-2732-1
ISSN
0277-786X
e-ISSN
1996-756X
Number of pages
6
Pages from-to
—
Publisher name
SPIE
Place of publication
Bellingham
Event location
Praha
Event date
Apr 1, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000483017000008

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