Tuning a terahertz wire laser
Tuning a terahertz wire laser
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DOI：
10.1038/nphoton.2009.218
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发表时间：
2009-12-01
期刊：
影响因子：
35
通讯作者：
Hu, Qing
中科院分区：
文献类型：
--
作者：
Qin, Qi;Williams, Benjamin S.;Hu, Qing
可调谐太赫兹激光器在传感和光谱学方面具有很好的应用前景，因为许多生物化学物质具有很强的光谱特性。太赫兹频率的指纹。传统上，激光的频率以类似于弦乐器的方式进行调谐，其中通过改变弦的长度(波矢量的纵向分量)和/或其张力(折射率)来改变音高。然而，这种方法很难在太赫兹半导体激光器中实现，因为它们的输出耦合效率很低。在这里，我们展示了一种新的调谐机制，它基于一种独特的‘线激光器’装置，其横向尺寸w是
Tunable terahertz lasers are desirable in applications in sensing and spectroscopy because many biochemical species have strong spectral. ngerprints at terahertz frequencies. Conventionally, the frequency of a laser is tuned in a similar manner to a stringed musical instrument, in which pitch is varied by changing the length of the string ( the longitudinal component of the wave vector) and/or its tension ( the refractive index). However, such methods are difficult to implement in terahertz semiconductor lasers because of their poor outcoupling efficiencies. Here, we demonstrate a novel tuning mechanism based on a unique 'wire laser' device for which the transverse dimension w is