Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
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DOI：
10.1063/1.4793424
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发表时间：
2013-03
影响因子：
4
通讯作者：
M. Ravaro;V. Jagtap;G. Santarelli;C. Sirtori;Lianhe H. Li;S. Khanna;E. Linfield;S. Barbieri
中科院分区：
文献类型：
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作者：
M. Ravaro;V. Jagtap;G. Santarelli;C. Sirtori;Lianhe H. Li;S. Khanna;E. Linfield;S. Barbieri
我们展示了一个相干成像系统的基础上太赫兹（THz）频率的量子级联激光器（QCL）相位锁定到近红外飞秒激光梳。相位锁定，使相干电光采样的连续波辐射的QCL通过产生外差拍频信号。我们使用这个拍音信号演示光栅扫描相干成像使用QCL发射在2.5太赫兹。在该频率下，我们的系统的检测噪声基底为3pW/Hz，并且长期相位稳定性<3 °/h，受到装置的机械稳定性的限制。
We demonstrate a coherent imaging system based on a terahertz (THz) frequency quantum cascade laser (QCL) phase-locked to a near-infrared fs-laser comb. The phase locking enables coherent electro-optic sampling of the continuous-wave radiation emitted by the QCL through the generation of a heterodyne beat-note signal. We use this beat-note signal to demonstrate raster scan coherent imaging using a QCL emitting at 2.5 THz. At this frequency the detection noise floor of our system is of 3 pW/Hz and the long-term phase stability is <3°/h, limited by the mechanical stability of the apparatus.