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Frequency Difference Thermally and Electrically Tunable Dual-Frequency Nd:YAG/LiTaO3 Microchip Laser

Beijing Institute of Technology, School of Optics and Photonics, 5 South Zhongguancun Street, Beijing 100081, China
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Appl. Sci. 2019, 9(10), 1969; https://doi.org/10.3390/app9101969
Received: 13 March 2019 / Revised: 1 May 2019 / Accepted: 9 May 2019 / Published: 14 May 2019
(This article belongs to the Special Issue Novel Advances in Optical Micro- and Nano-Cavities)
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Abstract

This study presents a dual-frequency microchip laser with a thermo-optically and electro-optically tuned frequency difference. The dual-frequency microchip cavity is formed by bonding a Lithium tantalite (LiTaO3, LTO) crystal chip and a neodymium-doped yttrium aluminum garnet (Nd:YAG) crystal chip. A single longitudinal mode is generated by the Nd:YAG crystal and split into two frequencies with perpendicular polarizations due to birefringent effect in the LTO chip. Furthermore, continuous beat frequency tuning at different scales is realized by adjusting the temperature and voltage applied to the LTO crystal. A maximum beat frequency of up to 27 GHz is obtained, and the frequency difference lock-in phenomenon is observed below the frequency difference of 405 MHz. View Full-Text
Keywords: microwave photonics; tunable dual frequency; microchip laser; electro-optic effect; thermo-optic effect microwave photonics; tunable dual frequency; microchip laser; electro-optic effect; thermo-optic effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gui, K.; Zhang, Z.; Xing, Y.; Zhang, H.; Zhao, C. Frequency Difference Thermally and Electrically Tunable Dual-Frequency Nd:YAG/LiTaO3 Microchip Laser. Appl. Sci. 2019, 9, 1969.

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