Room temperature CW and QCW operation of Ho: CaF2 laser pumped by Tm: fiber laser

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F17%3A00328891" target="_blank" >RIV/68407700:21340/17:00328891 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1117/12.2267784" target="_blank" >http://dx.doi.org/10.1117/12.2267784</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2267784" target="_blank" >10.1117/12.2267784</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Room temperature CW and QCW operation of Ho: CaF2 laser pumped by Tm: fiber laser

Popis výsledku v původním jazyce

Laser radiation in the wavelength range around 2 mu m is required for its specific properties - it is very suitable for medical applications, remote sensing, or pumping of optical parametric oscillators to generate ultrafast pulses in the mid-IR region further exploited in nonlinear optics. Crystals as YLF, YAG, LLF, and GdVO4 doped by holmium were already investigated and found suitable for the tunable laser generation around 2.1 mu m. Only a few works are devoted to the laser operation of holmium-doped fluorides as CaF2. In this work, pulsed and continuous-wave laser operation of a modified-Bridgman-grown Ho: CaF2 active crystal at room temperature is reported. A commercial 50 W 1940 nm Tm-fiber laser was used to pump a laser oscillator based on a novel 10 mm long 0.5 at.% Ho: CaF2 active crystal placed in the Peltier-cooled holder. In the pulsed regime (10 ms, 10 Hz), the laser slope efficiency of 53 % with respect to the absorbed pump power was achieved. The laser generated at the central wavelength of similar to 2085 nm with the maximum mean output power of 365 mW corresponding to the power amplitude of 3.65 W. In the continuous wave regime, the maximum output power was 1.11 W with the slope efficiency of 41 % with respect to the absorbed pump power. To our best knowledge this is the first demonstration of this laser active material operating in the CW regime at room temperature. The tuning range over 60 nm from 2034 to 2094 nm was achieved using a birefringent filter showing the possibility to develop a mode-locked laser system generating pulses in the sub-picosecond range.

Název v anglickém jazyce

Room temperature CW and QCW operation of Ho: CaF2 laser pumped by Tm: fiber laser

Popis výsledku anglicky

Laser radiation in the wavelength range around 2 mu m is required for its specific properties - it is very suitable for medical applications, remote sensing, or pumping of optical parametric oscillators to generate ultrafast pulses in the mid-IR region further exploited in nonlinear optics. Crystals as YLF, YAG, LLF, and GdVO4 doped by holmium were already investigated and found suitable for the tunable laser generation around 2.1 mu m. Only a few works are devoted to the laser operation of holmium-doped fluorides as CaF2. In this work, pulsed and continuous-wave laser operation of a modified-Bridgman-grown Ho: CaF2 active crystal at room temperature is reported. A commercial 50 W 1940 nm Tm-fiber laser was used to pump a laser oscillator based on a novel 10 mm long 0.5 at.% Ho: CaF2 active crystal placed in the Peltier-cooled holder. In the pulsed regime (10 ms, 10 Hz), the laser slope efficiency of 53 % with respect to the absorbed pump power was achieved. The laser generated at the central wavelength of similar to 2085 nm with the maximum mean output power of 365 mW corresponding to the power amplitude of 3.65 W. In the continuous wave regime, the maximum output power was 1.11 W with the slope efficiency of 41 % with respect to the absorbed pump power. To our best knowledge this is the first demonstration of this laser active material operating in the CW regime at room temperature. The tuning range over 60 nm from 2034 to 2094 nm was achieved using a birefringent filter showing the possibility to develop a mode-locked laser system generating pulses in the sub-picosecond range.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/GA16-10019S" target="_blank" >GA16-10019S: Braggovská vlákna pro přenos laserového záření ve spektrální oblasti 1900-2300 nm</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proc. SPIE Vol. 10238 - High-Power, High-Energy, and High-Intensity Laser Technology III

ISBN

978-1-5106-0977-8

ISSN

0277-786X

e-ISSN

1996-756X

Počet stran výsledku

4

Strana od-do

—

Název nakladatele

SPIE

Místo vydání

Bellingham

Místo konání akce

Praha

Datum konání akce

24. 4. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000407286200033