Growth, structure, spectroscopic, and laser properties of Ho-doped yttrium gallium garnet crystal
Year: 2024
Type: article
Abstract: We report on the growth of a 2.86 at.% Ho:YGG crystal using the optical floating zone technique in an oxygen-rich environment, followed by the study of its structure, optical spectroscopy and first demonstration of continuous-wave laser operation at 2.1 µm. The crystal structure refined through the Rietveld method reaffirms the cubic symmetry (sp. gr. Ia 3¯ d , a = 12.2796(9) Å). The absorption, stimulated-emission (SE), and gain cross-sections for the 5 I 8 ↔ 5 I 7 Ho 3+ transition were determined from the spectroscopic studies. The SE cross-section, σ SE , amounts to 9.5 × 10 −21 cm 2 at 2084 nm, and the luminescence lifetime of the 5 I 7 state is 8.94 ms. Among the Ho-doped garnets, Ho:YGG is characterized by smoother gain cross sections and a long luminescence lifetime. Laser operation of the Ho:YGG crystal is showcased using a 1908 nm Tm-fiber laser as a pump source. The in-band pumped Ho:YGG laser delivers 976 mW at 2085 and 2109 nm with a slope efficiency of 50.1%.
Source: Optics Express
DOI: 10.1364/oe.540363
Institutions: Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Universitat Rovira i Virgili, Shandong University, State Key Laboratory of Crystal Materials, Leibniz Institute for Crystal Growth, Université de Caen Normandie, Fujian Institute of Research on the Structure of Matter
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: G1691601356, G2431435069
OpenAlex ID: W4405916897