Frequency modulation spectroscopy with a THz quantum-cascade laser

被引：37
|
作者：
Eichholz, R. [1 ]
Richter, H. [1 ]
Wienold, M. [2 ]
Schrottke, L. [2 ]
Hey, R. [2 ]
Grahn, H. T. [2 ]
Huebers, H. -W. [1 ,3 ]
机构：
[1] German Aerosp Ctr DLR, Inst Planetary Res, D-12489 Berlin, Germany
[2] Paul Drude Inst Festkorperelekt, D-10117 Berlin, Germany
[3] Tech Univ Berlin, Inst Opt & Atomare Phys, D-10623 Berlin, Germany
来源：
OPTICS EXPRESS | 2013年 / 21卷 / 26期
关键词：
DIODE-LASER;
D O I：
10.1364/OE.21.032199
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report on a terahertz spectrometer for high-resolution molecular spectroscopy based on a quantum-cascade laser. High-frequency modulation (up to 50 MHz) of the laser driving current produces a simultaneous modulation of the frequency and amplitude of the laser output. The modulation generates sidebands, which are symmetrically positioned with respect to the laser carrier frequency. The molecular transition is probed by scanning the sidebands across it. In this way, the absorption and the dispersion caused by the molecular transition are measured. The signals are modeled by taking into account the simultaneous modulation of the frequency and amplitude of the laser emission. This allows for the determination of the strength of the frequency as well as amplitude modulation of the laser and of molecular parameters such as pressure broadening. (C)f 2013 Optical Society of America
引用
收藏
页码：32199 / 32206
页数：8
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