Temperature influence on spectroscopic and laser properties of Er:YLF crystal

Richard Švejkar; Jan Šulc; Helena Jelínková; Miroslav Čech

doi:10.1117/12.2506384

7 March 2019 Temperature influence on spectroscopic and laser properties of Er:YLF crystal

Richard Švejkar, Jan Šulc, Helena Jelínková, Miroslav Čech

Proceedings Volume 10896, Solid State Lasers XXVIII: Technology and Devices; 108961L (2019) https://doi.org/10.1117/12.2506384
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

The spectroscopic and laser properties of Er:YLF crystal, that is appropriate for generation at 2.8 μm, in temperature range 80 - 300 K are presented. The sample of Er:YLF (6 at. % of Er³⁺) had face-polished plan- parallel faces without anti-reflection coatings (thickness 9 mm). During experiments the Er:YLF was attached to temperature controlled copper holder and it was placed in vacuum chamber. The transmission and emission spectra together with the fluorescence decay time were measured depending on temperature. The excitation of Er:YLF was carried out by a laser diode radiation (pulse duration 5 ms, repetition rate 10 Hz, pump wavelength 972 nm). Laser resonator was hemispherical, 100 mm in length with flat pumping mirror (HR @ 2.8 μm) and spherical output coupler (r = 100 mm, R = 95 % @ 2.65 - 2.85 μm). The tunability of laser at 80, 200 and 300 K was tested using MgF₂ birefringent filter and several laser lines in wavelength range from 2709 nm to 2860 nm were observed. The fluorescence decay time of manifold ⁴I_11/2 (upper laser level) became shorter and intensity of up-conversion radiation was increasing with decreasing temperature. In pulsed regime, the highest slope efficiency with respect to absorbed mean power 23 % and the maximum output energy 12.5 mJ were reached. The laser radiation generated by Er:YLF laser (2.81 μm) is close to absorption peak of water (3 μm) thus this wavelength can be use in medicine and spectroscopy.

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Richard Švejkar, Jan Šulc, Helena Jelínková, and Miroslav Čech "Temperature influence on spectroscopic and laser properties of Er:YLF crystal", Proc. SPIE 10896, Solid State Lasers XXVIII: Technology and Devices, 108961L (7 March 2019); https://doi.org/10.1117/12.2506384

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