Polarization analysis of random THz lasers
Polarization analysis of random THz lasers
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DOI：
10.1063/5.0057175
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发表时间：
2021-07-01
期刊：
影响因子：
5.6
通讯作者：
Vitiello, Miriam S.
中科院分区：
文献类型：
--
作者：
Di Gaspare, Alessandra;Vitiello, Miriam S.
通过改变几何填充因子从8%到12%和孔半径从3到5 μ m，我们调查的干涉图案的一组表面发射，电泵浦随机激光器（RL）在太赫兹频率采用随机孔的表面图案，研究的偏振的发射模式，光谱发射，和功率提取。通过将激光束聚焦到线栅偏振器上，我们展示了RL发射和远场分布的光谱整形，实现了高度准直的发射（5度x 3度角发散）和340 GHz的光谱覆盖，具有多达11个随机激光模式。激光器的远场和光谱特性的偏振分析提供了一个有趣的工具来研究量子级联RL的复杂行为，提供了一种更详细地设计RL发射的途径。(c)2021年作者。所有文章内容，除非另有说明，是根据知识共享署名（CC BY）许可证（http：//creativecommons.org/licenses/by/4.0/）。
By varying the geometrical filling factor from 8% to 12% and the hole radius from 3 to 5 mu m, we investigate the interference pattern of a set of surface emitting, electrically pumped random lasers (RLs) at terahertz frequencies employing a surface pattern of random holes, studying the polarization of the emitted modes, the spectral emission, and the power extraction. By funneling the laser beams onto a wire grid polarizer, we demonstrate spectral reshaping of the RL emission and of the far-field profile, achieving highly collimated emission (5 degrees x 3 degrees angular divergence) and a spectral coverage of 340 GHz with up to 11 random lasing modes. The polarization analysis of the far-field and spectral characteristics of the laser offer an interesting tool to investigate the complex behavior of quantum cascade RLs, providing a route to engineer the emission of RLs in more detail. (c) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).