Author, as appears in the article.: Llamas V; Loiko P; Kifle E; Romero C; Vázquez De Aldana JR; Pan Z; Serres JM; Yuan H; Dai X; Cai H; Wang Y; Zhao Y; Zakharov V; Veniaminov A; Thouroude R; Laroche M; Gilles H; Aguiló M; Díaz F; Griebner U; Petrov V; Camy P; Mateos X

Department: Química Física i Inorgànica

URV's Author/s: , / Aguiló Díaz, Magdalena / Mateos Ferré, Xavier / Serres Serres, Josep Maria

Abstract: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement Depressed-index buried and surface channel waveguides (type III) are produced in a bulk 3.5 at.% Tm3+:CALGO crystal by femtosecond direct-laser-writing at kHz repetition rate. The waveguides are characterized by confocal microscopy and µ-Raman spectroscopy. Under in-band-pumping at 1679 nm (3H6 → 3F4 transition) by a Raman fiber laser, the buried channel waveguide laser with a circular cladding (diameter: 60 µm) generated a continuous-wave output power of 0.81 W at 1866-1947 nm with a slope efficiency of 71.2% (versus the absorbed pump power) and showed a laser threshold of 200 mW. The waveguide propagation losses were as low as 0.3 ± 0.2 dB/cm. The laser performance under in-band pumping was superior compared pumping at ∼800 nm (3H6 → 3H4 transition), i.e., the convetional pump wavelength. Vibronic laser emission from the WG laser above 2 µm is also achieved. The low-loss behavior, the broadband emission properties and good power scaling capabilities indicate the suitability of Tm3+:CALGO waveguides for mode-locked laser operation at ∼2 µm.

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

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 10944087

Author's mail: josepmaria.serres@urv.cat f.diaz@urv.cat xavier.mateos@urv.cat magdalena.aguilo@urv.cat

Author identifier: 0000-0002-4299-538X 0000-0003-4581-4967 0000-0003-1940-1990 0000-0001-6130-9579

Record's date: 2023-10-14

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-3-3528&id=426220

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

Papper original source: Optics Express. 28 (3): 3528-3540

APA: Llamas V; Loiko P; Kifle E; Romero C; Vázquez De Aldana JR; Pan Z; Serres JM; Yuan H; Dai X; Cai H; Wang Y; Zhao Y; Zakharov V; Veniaminov A; Thouroud (2020). Ultrafast laser inscribed waveguide lasers in Tm:CALGO with depressed-index cladding. Optics Express, 28(3), 3528-3540. DOI: 10.1364/OE.384258

Article's DOI: 10.1364/OE.384258

Entity: Universitat Rovira i Virgili

Journal publication year: 2020

Publication Type: Journal Publications