Excited-state absorption and upconversion pumping of Tm<sup>3+</sup>-doped potassium lutetium double tungstate - Institut d'Optique Graduate School Access content directly
Journal Articles Optics Express Year : 2023

Excited-state absorption and upconversion pumping of Tm3+-doped potassium lutetium double tungstate

Patrick Georges
Frédéric Druon

Abstract

We report on a bulk thulium laser operating on the 3 H 4 → 3 H 5 transition with pure upconversion pumping at 1064 nm by an ytterbium fiber laser (addressing the 3 F 4 → 3 F 2,3 excited-state absorption (ESA) transition of Tm 3+ ions) generating 433 mW at 2291 nm with a slope efficiency of 7.4% / 33.2% vs. the incident / absorbed pump power, respectively, and linear laser polarization representing the highest output power ever extracted from any bulk 2.3 µm thulium laser with upconversion pumping. As a gain material, a Tm 3+-doped potassium lutetium double tungstate crystal is employed. The polarized ESA spectra of this material in the near-infrared are measured by the pump-probe method. The possible benefits of dual-wavelength pumping at 0.79 and 1.06 µm are also explored, indicating a positive effect of co-pumping at 0.79 µm on reducing the threshold pump power for upconversion pumping.
Fichier principal
Vignette du fichier
oe-31-9-14808-4.pdf (11.56 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-04247290 , version 1 (18-10-2023)

Identifiers

Cite

Aleksey Tyazhev, Pavel Loiko, Lauren Guillemot, Alexandre Kouta, Rosa Maria Solé, et al.. Excited-state absorption and upconversion pumping of Tm3+-doped potassium lutetium double tungstate. Optics Express, 2023, 31 (9), pp.14808-14820. ⟨10.1364/oe.487130⟩. ⟨hal-04247290⟩
97 View
27 Download

Altmetric

Share

Gmail Facebook X LinkedIn More