Output parameters optimization of Q-switched Nd:YAG/V:YAG microchip laser generating at 1.34 μm

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00377860" target="_blank" >RIV/68407700:21340/24:00377860 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1117/12.3000097" target="_blank" >https://doi.org/10.1117/12.3000097</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.3000097" target="_blank" >10.1117/12.3000097</a>

Result language

angličtina

Original language name

Output parameters optimization of Q-switched Nd:YAG/V:YAG microchip laser generating at 1.34 μm

Original language description

Q-switched microchip lasers are very compact sources of directional radiation. To construct such a radiation source in the 1.3 um spectral region, Nd:YAG active medium with V:YAG saturable absorber can be used. Radiation in this spectral range is safer for the eye in comparison with 1.06 um radiation due to its higher absorption in the water. For this reason, Nd:YAG/V:YAG microchip laser could be suitable for free-space light manipulation applications such as LIDARs. Nd:YAG/V:YAG microchip lasers and optimization of their output parameters based on diode-pumping beam parameters variation are presented here. For this optimization, aspheric lenses were used, which made it possible to increase the pumping beam area in the waist more than four times from 0.13mm2 to 0.58mm2. Two Nd:YAG/V:YAG microchip lasers with a total length of 2.6mm and 4.7mm were tested. In both cases, the initial transmission of the V:YAG saturable absorber was 80% @ 1.34 um and the output coupler reflectivity was 90% @ 1.34 um. Lasers were pumped longitudinally by a fiber-coupled laser diode (core diameter 400 um, numerical aperture 0.22) in a pulse regime at a wavelength of around 805 nm in the range of repetition frequencies of 10 - 1000 Hz. Both Nd:YAG/V:YAG lasers provided Q-switched pulses at a wavelength of 1338 nm. By increasing the pumping beam area it was possible to achieve almost twice as high pulse energy and peak power up to 76 uJ and 85 kW using a 2.6 mm long laser. In the case of a 4.7 mm long laser, the pulse energy and peak power increased more than four times up to 139 uJ and 84 kW. The output pulse duration hardly depended on used pumping optics and its mean value was 0.92 ns/2.6mm and 1.91 ns/4.7 mm. Higher spatial transverse modes were not observed for most pumping pulse repetition frequencies.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Article name in the collection

Proc. SPIE 12864, Solid State Lasers XXXIII: Technology and Devices

ISBN

978-1-5106-6987-1

ISSN

0277-786X

e-ISSN

1996-756X

Number of pages

9

Pages from-to

—

Publisher name

SPIE

Place of publication

Bellingham (stát Washington)

Event location

San Francisco, CA

Event date

Jan 27, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001211786700013