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首页> 外文期刊>Applied physics. B, Lasers and optics >Far-infrared cw difference-frequency generation using vertically integrated and planar low temperature grown GaAs photomixers: application to H_2S rotational spectrum up to 3 THz
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Far-infrared cw difference-frequency generation using vertically integrated and planar low temperature grown GaAs photomixers: application to H_2S rotational spectrum up to 3 THz

机译：使用垂直集成和平面低温生长的GaAs光混频器产生远红外连续波差频：应用于高达3 THz的H_2S旋​​转光谱

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摘要

The generation of continuous coherent THz radiation by mixing two cw Ti:Sa laser beams with a well-controlled frequency separation for a new scheme of vertically integrated low temperature grown GaAs (LTG-GaAs) spiral photomixer is reported. For this new photomixer device used in THz emission, the LTG-GaAs active layer is sandwiched between the two parallel metal plates of a high-speed photodetector loaded by a broadband spiral antenna. We have exploited the advantage of a higher delivered power in the low part of the spectrum (< 2000 GHz), while a low RC time constant planar interdig-itated detector was used at the upper frequency. The performances of the spectroscopic setup in terms of spectral resolution (5 MHz), tunability and frequency capability are assessed by measurements of the pure rotational spectra of hydrogen sulfide (H_2S) up to 3000 GHz.
机译：据报道，对于垂直集成的低温生长GaAs（LTG-GaAs）螺旋光混合器的新方案，通过将两个连续的Ti：Sa激光束与频率间隔控制良好的混合产生连续的太赫兹辐射。对于这种用于THz发射的新型光混频器设备，LTG-GaAs有源层夹在宽带螺旋天线加载的高速光电探测器的两个平行金属板之间。我们已经利用了频谱较低部分（<2000 GHz）中较高的输出功率的优势，而在较高频率下使用了较低的RC时间常数平面数字化检波器。通过测量高达3000 GHz的硫化氢（H_2S）的纯旋转光谱，可以评估光谱设置在光谱分辨率（5 MHz），可调谐性和频率能力方面的性能。

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