Tunable, High-Power, Narrow-Linewidth Diode Laser for Potassium Alkali Metal Vapor Laser Pumping

This work proposes a method of compressing spectral linewidth and tuning the central wavelength of multiple high-power diode laser arrays in an external cavity feedback structure based on one volume Bragg grating (VBG). Through the combination of beam collimation and spatial beam technologies, a dio...

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Bibliographic Details
Published inCrystals (Basel) Vol. 12; no. 11; p. 1675
Main Authors Han, Jinliang, Zhang, Jun, Shan, Xiaonan, Zhang, Yawei, Peng, Hangyu, Qin, Li, Wang, Lijun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2022
Subjects
Alkali metals
Analysis
Arrays
Bragg gratings
diode laser array
Efficiency
external cavity feedback
Laser arrays
Laser pumping
Lasers
Metal vapor lasers
Methods
narrow linewidth
Potassium
Self excitation
Semiconductor lasers
Tunable lasers
Tuning
tuning central wavelength
volume Bragg grating
China
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Summary:This work proposes a method of compressing spectral linewidth and tuning the central wavelength of multiple high-power diode laser arrays in an external cavity feedback structure based on one volume Bragg grating (VBG). Through the combination of beam collimation and spatial beam technologies, a diode laser source producing 102.1 W at an operating current of 40 A is achieved. This laser source has a central wavelength of 766 nm and a narrow spectral linewidth of 0.164 nm. Moreover, a tuning central wavelength ranging from 776–766.231 nm is realized by precisely controlling the temperature of the VBG, and the locked central wavelength as a function of temperature shifts at the rate of approximately 0.0076 nm/°C. The results further prove that the smile under 1 μm can restrain the self-excitation effect of the emitting laser, which can influence the efficiency of the potassium alkali metal vapor laser pumping.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12111675