Effect of cryogenic temperature on spectroscopic and laser properties of Er,La:SrF2-CaF2 crystal

Richard Švejkar; Jan Šulc; Michal Němec; Helena Jelínková; Maxim E. Doroshenko; Andrei N. Nakladov; Vjatcheslav V. Osiko

doi:10.1117/12.2208569

16 March 2016 Effect of cryogenic temperature on spectroscopic and laser properties of Er,La:SrF₂-CaF₂ crystal

Richard Švejkar, Jan Šulc, Michal Němec, Helena Jelínková, Maxim E. Doroshenko, Andrei N. Nakladov, Vjatcheslav V. Osiko

Author Affiliations +

Proceedings Volume 9726, Solid State Lasers XXV: Technology and Devices; 97261C (2016) https://doi.org/10.1117/12.2208569
Event: SPIE LASE, 2016, San Francisco, California, United States

Abstract

The laser and spectroscopic properties of crystal Er,La:SrF₂-CaF₂ at temperature range 80 - 300 K, which is appropriate for generation of radiation around 2.7 um is presented. The sample of Er,La:SrF₂-CaF₂ (concentration Er(0.04), La(0.12):Ca(0.77)Sr(0.07)) had plan-parallel face-polished faces without anti-reflection coatings (thickness 8.2 mm). During spectroscopy and laser experiments the Er,La:SrF₂-CaF₂ was attached to temperature controlled copper holder and it was placed in vacuum chamber. The transmission and emission spectra of Er,La:SrF₂-CaF₂ together with the fluorescence decay time were measured in dependence on temperature. The excitation of Er,La:SrF₂-CaF₂ was carried out by a laser diode radiation (pulse duration 5 ms, repetition rate 20 Hz, pump wavelength 973 nm). Laser resonator was hemispherical, 140 mm in length with at pumping mirror (HR @ 2.7 µm) and spherical output coupler (r = 150 mm, R = 95 % @ 2.5 - 2.8 µm). Tunability of laser at 80 K in range 2690 - 2765 nm was obtained using MgF₂ birefringent filter. With decreasing temperature of sample the fluorescence lifetime of manifold ⁴I_11/2 (upper laser level) became shorter and intensity of up-conversion radiation was increasing. The highest slope efficiency with respect to absorbed power was 2.3 % at 80 K. The maximum output of peak amplitude power was 0.3 W at 80 K, i.e. 1.5 times higher than measured this value at 300 K. The wavelength generated by Er,La:SrF₂-CaF₂ laser (2.7 µm) is relatively close to absorption peak of water (3 µm) and so, one of the possible usage should be in medicine and spectroscopy.

Citation Download Citation

Richard Švejkar, Jan Šulc, Michal Němec, Helena Jelínková, Maxim E. Doroshenko, Andrei N. Nakladov, and Vjatcheslav V. Osiko "Effect of cryogenic temperature on spectroscopic and laser properties of Er,La:SrF₂-CaF₂ crystal", Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 97261C (16 March 2016); https://doi.org/10.1117/12.2208569

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available