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Article Dans Une Revue Optics Express Année : 2023

Tm:CALGO lasers at 2.32 µm: cascade lasing and upconversion pumping

Hippolyte Dupont
  • Fonction : Auteur
Aleksey Tyazhev
Luidgi Giordano
  • Fonction : Auteur
Zhongben Pan
Hongwei Chu
Dechun Li
Bruno Viana
Ammar Hideur
  • Fonction : Auteur
Lauren Guillemot
Alain Braud
Patrice Camy
  • Fonction : Auteur
Patrick Georges
Frédéric Druon

Résumé

We report on the first laser operation of a disordered Tm:CaGdAlO 4 crystal on the 3 H 4 → 3 H 5 transition. Under direct pumping at 0.79 µm, it generates 264 mW at 2.32 µm with a slope efficiency of 13.9% and 22.5% vs. incident and absorbed pump power, respectively, and a linear polarization (σ). Two strategies to overcome the bottleneck effect of the metastable 3 F 4 Tm 3+ state leading to the ground-state bleaching are exploited: cascade lasing on the 3 H 4 → 3 H 5 and 3 F 4 → 3 H 6 transitions and dual-wavelength pumping at 0.79 and 1.05 µm combining the direct and upconversion pumping schemes. The cascade Tm-laser generates a maximum output power of 585 mW at 1.77 µm ( 3 F 4 → 3 H 6 ) and 2.32 µm ( 3 H 4 → 3 H 5 ) with a higher slope efficiency of 28.3% and a lower laser threshold of 1.43 W, out of which 332 mW are achieved at 2.32 µm. Under dual-wavelength pumping, further power scaling to 357 mW at at 2.32 µm is observed at the expense of increased laser threshold. To support the upconversion pumping experiment, excited-state absorption spectra of Tm 3+ ions for the 3 F 4 → 3 F 2,3 and 3 F 4 → 3 H 4 transitions are measured for polarized light. Tm 3+ ions in CaGdAlO 4 exhibit broadband emission at 2.3 - 2.5 µm making this crystal promising for ultrashort pulse generation.

Dates et versions

hal-04209391 , version 1 (17-09-2023)

Identifiants

Citer

Hippolyte Dupont, Pavel Loiko, Aleksey Tyazhev, Luidgi Giordano, Zhongben Pan, et al.. Tm:CALGO lasers at 2.32 µm: cascade lasing and upconversion pumping. Optics Express, 2023, 31 (12), pp.18751. ⟨10.1364/OE.487590⟩. ⟨hal-04209391⟩
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