Author, as appears in the article.: Yong Y; Aravazhi S; Vázquezcórdova S; Carjaval J; Díaz F; Herek J; García-BLANCO S; Pollnau M

Department: Química Física i Inorgànica

URV's Author/s: , / Carvajal Martí, Joan Josep

Keywords: Hashtag Etiqueta «#» @uroweb @residentesaeu @infoAeu

Abstract: © 2016 Optical Society of America. We study the spectroscopic properties of thin films of potassium ytterbium gadolinium double tungstates, KYb0.57Gd0.43 (WO4)2, and potassium ytterbium lutetium double tungstates, KYb0.76Lu0.24 (WO4)2, specifically at the central absorption line near 981 nm wavelength, which is important for amplifiers and lasers. The absorption cross-section of both thin films is found to be similar to those of bulk potassium rare-earth double tungstates, suggesting that the crystalline layers retain their spectroscopic properties albeit having >50 at.% Yb3+ concentration. The influence of sample temperature is investigated and found to substantially affect the measured absorption cross-section. Since amplifiers and lasers typically operate above room temperature due to pump-induced heating, the temperature dependence of the peak-absorption cross-section of the KYb0.57Gd0.43 (WO4)2 is evaluated for the sample being heated from 20 °C to 170 °C, resulting in a measured reduction of peakabsorption cross-section at the transitions near 933 nm and 981 nm by ∼40% and ∼52%, respectively. It is shown that two effects, the change of Stark-level population and linewidth broadening due to intra-manifold relaxation induced by temperature-dependent electronphonon interaction, contribute to the observed behavior. The effective emission cross-sections versus temperature have been calculated. Luminescence-decay measurements show no significant dependence of the luminescence lifetime on temperature.

Thematic Areas: Química Optics Odontología Medicina iii Medicina ii Materiais Matemática / probabilidade e estatística Interdisciplinar Engenharias iv Engenharias iii Engenharias ii Ciências biológicas i Ciências agrárias i Ciência da computação Biotecnología Atomic and molecular physics, and optics Astronomia / física

ISSN: 10944087

Author's mail: f.diaz@urv.cat joanjosep.carvajal@urv.cat

Author identifier: 0000-0003-4581-4967 0000-0002-4389-7298

Record's date: 2023-10-14

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Optics Express. 24 (23): 26825-26837

APA: Yong Y; Aravazhi S; Vázquezcórdova S; Carjaval J; Díaz F; Herek J; García-BLANCO S; Pollnau M (2016). Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content. Optics Express, 24(23), 26825-26837. DOI: 10.1364/OE.24.026825

Article's DOI: 10.1364/OE.24.026825

Entity: Universitat Rovira i Virgili

Journal publication year: 2016

Publication Type: Journal Publications