Optimization of Pump Pulse Duration and Cr:ZnSe Crystal Length for Efficient Generation of Tunable Mid-IR Laser Radiation Pumped by Laser Diode at Room Temperature
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00377845" target="_blank" >RIV/68407700:21340/24:00377845 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3103/S1541308X24700249" target="_blank" >https://doi.org/10.3103/S1541308X24700249</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3103/S1541308X24700249" target="_blank" >10.3103/S1541308X24700249</a>
Alternative languages
Result language
angličtina
Original language name
Optimization of Pump Pulse Duration and Cr:ZnSe Crystal Length for Efficient Generation of Tunable Mid-IR Laser Radiation Pumped by Laser Diode at Room Temperature
Original language description
The spectral and laser output characteristics of Cr:ZnSe single crystals optically polished at four different lengths of 2, 3, 5, and 10 mm combined with or without antireflection (AR) coatings were investigated under pulse and continuous wave (CW) laser diode excitation at the wavelength of similar to 1.7 um. The absorption and fluorescence spectra of Cr2+ ions were measured at room temperature. Optimization of laser system efficiency was performed step-by-step in dependence on the active length of the crystal sample, output coupler reflectivity, the duration of the pump pulse, and the repetition rate. For a given 1 : 1 transferring optics, a 3-mm thick AR-coated Cr:ZnSe crystal was chosen as optimal in pulse mode of operation: The similar to 10% higher maximum slope efficiency of similar to 39% with respect to optical-to-optical power conversion was obtained with the 3-mm thick AR-coated sample compared to the uncoated one. The laser system was characterized by an optimal repetition rate of 10 Hz and a pump pulse duration of 20 ms selected for its best efficiency performance. In CW mode, better results were observed with a thicker sample (5 mm, AR-coated). Specifically, the output power of similar to 2.7 W at the wavelength of similar to 2.4 mu m with a slope efficiency of similar to 24% was obtained. In this case, the M-2 beam parameter was measured as low as similar to 1.1 +/- 0.1. Using a 0.8 mm thick MgF2 birefringent filter plate, the laser oscillations were continuously tunable in the range of similar to 2.1-2.7 um within narrow spectral linewidths (5-10 nm FWHM) and a Gaussian beam profile in both the pulse and CW regimes.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
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)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physics of Wave Phenomena
ISSN
1541-308X
e-ISSN
1934-807X
Volume of the periodical
32
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
257-267
UT code for WoS article
001303635300006
EID of the result in the Scopus database
2-s2.0-85202842102