Improvement to beam quality of optically pumped terahertz gas lasers with hole-coupling resonators

Gen Li; Du Wang; Li Fang; Zhenghui Ran; Qiang Yan

doi:10.1117/1.OE.58.2.026104

5 February 2019 Improvement to beam quality of optically pumped terahertz gas lasers with hole-coupling resonators

Gen Li, Du Wang, Li Fang, Zhenghui Ran, Qiang Yan

Author Affiliations +

Optical Engineering, Vol. 58, Issue 2, 026104 (February 2019). https://doi.org/10.1117/1.OE.58.2.026104

Abstract

The hole-coupling method, which is commonly used in the optically pumped THz gas laser, will reduce the beam quality due to the hard-edge diffraction. It is shown that by optimizing the parameters of the resonator a diffraction-limited output beam can be obtained. A method is proposed for the selection of a higher order waveguide mode, whose first zero point along the radial direction coincides with the edge of the output hole coupler and the effect of hard edge diffraction is depressed. Measurements of beam quality are taken on an experimental prototype whose optical setup is designed by this method. A quasi-Gaussian beam output is obtained, and the beam quality M² factor is about 1.15

Citation Download Citation

Gen Li, Du Wang, Li Fang, Zhenghui Ran, and Qiang Yan "Improvement to beam quality of optically pumped terahertz gas lasers with hole-coupling resonators," Optical Engineering 58(2), 026104 (5 February 2019). https://doi.org/10.1117/1.OE.58.2.026104

Received: 11 August 2018; Accepted: 3 January 2019; Published: 5 February 2019

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