Comparison of the conversion efficiency of 894.6nm frequency doubling cavity with different transmission input coupler

ZHANG Yan; YU Juan; ZHANG Junxiang

doi:10.7510/jgjs.issn.1001-3806.2022.06.012

LASER TECHNOLOGY > 2022 > 46(6): 784-787. > DOI: 10.7510/jgjs.issn.1001-3806.2022.06.012

ZHANG Yan, YU Juan, ZHANG Junxiang. Comparison of the conversion efficiency of 894.6nm frequency doubling cavity with different transmission input coupler[J]. LASER TECHNOLOGY, 2022, 46(6): 784-787. DOI: 10.7510/jgjs.issn.1001-3806.2022.06.012

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Comparison of the conversion efficiency of 894.6nm frequency doubling cavity with different transmission input coupler

1.
School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China
2.
Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, China

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Received Date: September 08, 2021
Revised Date: July 21, 2022
Published Date: November 24, 2022

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Abstract

Abstract

In order to choose a better input coupler, the conversion efficiency of the frequency doubling cavity were studied in the case of the transmittance of the input coupler to the fundamental light of 5% and 10%, respectively. 447.3nm blue light was obtained by external-cavity frequency doubling of a tapered amplifier-boosted continuous-wave diode laser at cesium D₁ line. The frequency doubling cavity consists of a two-mirror standing wave cavity with a periodically poled KTiOPO₄ (PPKTP) crystal inside. With a maximum fundamental power around 350mW, the frequency doubling cavity with a 5% transmittance input coupler generate 178mW blue light, corresponding to a conversion efficiency of 50.8%. With the input coupler with a 10% transmittance at the fundamental wavelength, 131mW of blue light is obtained, and the corresponding conversion efficiency is 37.4%. With a maximum input fundamental power, the output blue power was measured for 0.5h. In the frequency doubling cavity with 5% transmittance input coupler, the root mean square fluctuation is 1.4%, while the other is 0.7%. The result shows that the input coupler with 5% transmittance is better. This research is helpful for preparing high quality pump light resources to generate nonclassical light at cesium D₁ line.
- laser technique,
- external-cavity frequency doubling,
- input mirrors,
- transmittance

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