Chinese Optics Letters, Volume. 20, Issue 11, 111902(2022)

Sum-frequency generation of a laser and its background in an on-chip lithium-niobate microdisk

Author Affiliations
• 1MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
• 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
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Lithium-niobate microcavities have not only the ability to resonantly enhance light–matter interaction but also excellent nonlinear optical properties, thereby providing an important platform for nonlinear optical investigations. In this paper, we report the observation of multi-peak spectra in the near infrared range in lithium-niobate microcavities on a chip under the pump of a 1550 nm continuous laser. Such a multi-peak spectrum was attributed to the sum-frequency of the pump laser and its background. The conversion efficiencies of the sum-frequency processes are of the order of $61.5%W-1$. The influences of the phenomenon on nonlinear processes were further discussed.

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1. Introduction

Whispering gallery mode (WGM) microcavities have attracted much attention in recent years for their broad applications ranging from ultra-sensitive sensing[1], enhanced nonlinear optical effects[2,3] to tunable quantum light sources[4]. These applications benefit from the ability of WGM microcavities to confine light for a long time, which is indicated by quality (Q) factors, in a small mode volume (V) via total internal reflection. Such light trapping mechanisms make WGM microcavities have high Q in very broad spectrum ranges, which is only limited by the transparency window of the material of which the microcavities are made.

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Zhenzhong Hao, Li Zhang, Jie Wang, Fang Bo, Feng Gao, Guoquan Zhang, Jingjun Xu. Sum-frequency generation of a laser and its background in an on-chip lithium-niobate microdisk[J]. Chinese Optics Letters, 2022, 20(11): 111902

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Category: Nonlinear Optics