Tm, Ho:GGAG 2.1 µm laser diode-pumped at 1.7 µm

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00367177" target="_blank" >RIV/68407700:21340/23:00367177 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1117/12.2650269" target="_blank" >https://doi.org/10.1117/12.2650269</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2650269" target="_blank" >10.1117/12.2650269</a>

Result language

angličtina

Original language name

Tm, Ho:GGAG 2.1 µm laser diode-pumped at 1.7 µm

Original language description

Holmium-doped solid state lasers are important direct sources of coherent radiation at 2 μm with applications in medicine, spectroscopy, LIDAR technologies, or conversion to mid-infrared wavelengths. Co-doping with Tm3+ sensitizer enables resonant diode-pumping at 1.7 μm with aim to reduce lasing threshold and thermal loading and to increase efficiency and obtainable wavelengths range. The Gd3(Ga,Al)5O12 (GGAG) crystal investigated in this work belongs to a class of mixed or disordered garnets. Such crystals are actively researched host material for rare earth ions due to broadening of dopant spectral lines and preserving good thermal and mechanical properties of crystalline garnet hosts. Spectroscopic and laser properties and their doping concentration dependence of Tm, Ho:GGAG crystal were investigated under 1.7 μm diode pumping. The laser material was Tm3+ and Ho3+ co-doped Gd3(Ga,Al)5O12. It was grown by Czocharlski method from melt with initial composition Gd2.91Ho0.012Tm0.075Ga2.7Al2.3O12. The grown crystal boule was cut into eight face-polished crystal samples 5.4 mm thick and 8–14 mm wide in diameter. Tm3+ and Ho3+ content of samples was between 2.1–3.2 at.% Tm/Gd and 0.3–0.5 at.% Ho/Gd. Crystals were pumped at room temperature by fiber-coupled (NA = 0.22, core diameter = 400 µm) 30 W laser diode emitting at 1.7 µm in quasi-continuous regime. A hemispherical laser cavity was tested with OC curvature of -150 mm and reflectivity of 96.5 % at 2090 nm. All lasers emitted at 2084–2090 nm range in the untuned setup. Threshold absorbed power was in 0.1–0.3 W range and generated beam corresponded to TEM00 mode. Both the highest efficiency w.r.t. absorbed power of 37 % and the highest output power amplitude of 3.8 W were obtained for 3.0 at.% (Tm/Gd) 0.5 at.% (Ho/Gd) crystal. The total wavelength tunability range of 1936–2111 nm was obtained, with lower concentration samples tended to result in broader continuous tuning curves.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Center for advanced applied science</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proc. SPIE 12399, Solid State Lasers XXXII: Technology and Devices

ISBN

9781510659032

ISSN

0277-786X

e-ISSN

1996-756X

Number of pages

10

Pages from-to

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Publisher name

SPIE

Place of publication

Bellingham (stát Washington)

Event location

San Francisco, California

Event date

Jan 28, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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