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

被引：21

作者：

Danylov, Andriy A. ^{[1
]}

Light, Alexander R. ^{[1
]}

Waldman, Jerry ^{[1
]}

Erickson, Neal R. ^{[2
]}

Qian, Xifeng ^{[1
]}

Goodhue, William D. ^{[1
]}

机构：

[1] Univ Massachusetts Lowell, Dept Phys & Appl Phys, Photon Ctr, Lowell, MA 01854 USA

[2] Univ Massachusetts Amherst, Dept Astron, Amherst, MA 01003 USA

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 25期

关键词：

PHASE-LOCKING; GAAS;

D O I：

10.1364/OE.20.027908

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C)2012 Optical Society of America

引用

页码：27908 / 27914

页数：7

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