Evaluation of outputted and leaked power for a micro-cavity laser in the terahertz region

Haoyu Li; Kepeng Rong; Qing Luo; Jiao Yang; Lijuan Tan; He Cai; Xiaoxu Liu; Goufei An; Haizhi Song; You Wang

doi:10.1117/12.2543454

12 March 2020 Evaluation of outputted and leaked power for a micro-cavity laser in the terahertz region

Haoyu Li, Kepeng Rong, Qing Luo, Jiao Yang, Lijuan Tan, He Cai, Xiaoxu Liu, Goufei An, Haizhi Song, You Wang

Proceedings Volume 11441, 2019 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications; 114410A (2020) https://doi.org/10.1117/12.2543454
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

Terahertz wave is generally an electromagnetic wave at the wavelength of 0.1-10 THz (30-3000 μm). The terahertz laser is a new type of radiation source with many unique advantages and has broad applications. Generally, the size of a normal laser cavity is from a few of to several hundred millimeters, and the size of a micro-cavity is mainly from a few of to several hundred micrometers in the wavelength region of ultraviolet, visible, and near-infrared. However, if the wavelength increases to the terahertz region, the wavelength is of the order of the micro-cavity size. The power distributions inside and outside the cavity of a terahertz laser are significantly different from those for a conventional laser cavity. In this paper, a theoretical model is established to study the outputted and leaked power of a micro-cavity in the terahertz band. We assume that the wavelength of an emission terahertz source is 240 μm and simulate the output features of a micro-cavity laser with the Finite-Difference Time-Domain (FDTD) algorithm. The output characteristics of a micro-cavity have been analyzed by using two types of material and different thicknesses of the sidewall. It has been found that when the thicknesses of both silver and aluminum sidewalls are reduced to around 16 μm, the power leaking from the micro-cavity begins to increase with the decrease of the sidewall thickness. In this way, the sidewall no longer restrains terahertz radiation inside the cavity. The simulation results might be referred for the design of a terahertz laser with the micro-cavity.

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Haoyu Li, Kepeng Rong, Qing Luo, Jiao Yang, Lijuan Tan, He Cai, Xiaoxu Liu, Goufei An, Haizhi Song, and You Wang "Evaluation of outputted and leaked power for a micro-cavity laser in the terahertz region", Proc. SPIE 11441, 2019 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications, 114410A (12 March 2020); https://doi.org/10.1117/12.2543454

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KEYWORDS

Terahertz radiation

Laser resonators

Optical simulations

Electromagnetic radiation

Finite-difference time-domain method

Laser applications

Medicine

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