2.32太赫兹量子级联激光器频率锁定到微波合成器源的谐波上。

2.32 THz quantum cascade laser frequency-locked to the harmonic of a microwave synthesizer source.

作者信息

Danylov Andriy A, Light Alexander R, Waldman Jerry, Erickson Neal R, Qian Xifeng, Goodhue William D

机构信息

Photonics Center, Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA.

出版信息

Opt Express. 2012 Dec 3;20(25):27908-14. doi: 10.1364/OE.20.027908.

DOI:10.1364/OE.20.027908

PMID:23262736

Abstract

Frequency stabilization of a THz quantum cascade laser (QCL) to the harmonic of a microwave source has been accomplished using a Schottky diode waveguide mixer designed for harmonic mixing. The 2.32 THz, 1.0 milliwatt CW QCL is coupled into the signal port of the mixer and a 110 GHz signal, derived from a harmonic of a microwave synthesizer, is coupled into the IF port. The difference frequency between the 21st harmonic of 110 GHz and the QCL is used in a discriminator to adjust the QCL bias current to stabilize the frequency. The short-term frequency jitter is reduced from 550 kHz to 4.5 kHz (FWHM) and the long-term frequency drift is eliminated. This performance is compared to that of several other THz QCL frequency stabilization techniques.

摘要

利用专为谐波混频设计的肖特基二极管波导混频器，实现了太赫兹量子级联激光器（QCL）到微波源谐波的频率稳定。将2.32太赫兹、1.0毫瓦的连续波QCL耦合到混频器的信号端口，将源自微波合成器谐波的110吉赫兹信号耦合到中频端口。110吉赫兹第21谐波与QCL之间的差频用于鉴频器中，以调整QCL偏置电流来稳定频率。短期频率抖动从550千赫兹降低到4.5千赫兹（半高宽），长期频率漂移得以消除。将此性能与其他几种太赫兹QCL频率稳定技术的性能进行了比较。