An efficient optically pumped terahertz laser without metal-mesh mirrors

Liang Miao; Duluo Zuo; Yanzhao Lu; Zuhai Cheng

doi:10.1117/12.871329

4 November 2010 An efficient optically pumped terahertz laser without metal-mesh mirrors

Liang Miao, Duluo Zuo, Yanzhao Lu, Zuhai Cheng

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 78540F (2010) https://doi.org/10.1117/12.871329
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The efficiency of a simply designed optically pumped terahertz laser is studied experimentally. The terahertz laser cavity only consists of a quartz glass tube, an antireflection-coated Ge window and a SiO₂ window. The Ge crystal acts as the high-reflectivity mirror of terahertz radiation and the input coupler of pump laser instead of complicated metal-mesh mirrors. The Ge crystal is near 3 mm thick, whose exact thickness is designed according to etalon effects to maximize terahertz reflectivity. NH3 gas is filled in the cavity as the active medium and pumped by a TEA CO₂ laser. As high as 25.9 mJ terahertz radiation at the wavelength of 151.5 μm is extracted from 1.76 J pump energy. The corresponding photon conversion efficiency of this terahertz laser reaches 41.5%. A 4.7-mm-thick GaAs crystal and a 6-mm-thick ZnSe crystal are also chosen to be the input coupler. The experimental results show that the efficiency of the Ge window is 54% and 66% higher than that of the GaAs and ZnSe windows, respectively. The reason of the higher efficiency of the Ge window is demonstrated experimentally and theoretically in this paper.

Citation Download Citation

Liang Miao, Duluo Zuo, Yanzhao Lu, and Zuhai Cheng "An efficient optically pumped terahertz laser without metal-mesh mirrors", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78540F (4 November 2010); https://doi.org/10.1117/12.871329

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KEYWORDS

Terahertz radiation

Germanium

Reflectivity

Crystals

Gallium arsenide

Fabry–Perot interferometers

Mirrors

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