Frequency stabilization of a terahertz quantum-cascade laser to the Lamb dip of a molecular absorption line

被引：4

作者：

Voigt, R. ^{[1
]}

Wienold, M. ^{[1
,2
]}

Jayasankar, D. ^{[3
]}

Drakinskiy, V. ^{[3
]}

Stake, J. ^{[2
,3
]}

Sobis, P. ^{[4
]}

Schrottke, L. ^{[5
]}

Lu, X. ^{[5
]}

Grahn, H. T. ^{[5
]}

Huebers, H-W ^{[1
,2
]}

机构：

[1] German Aerosp Ctr DLR, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany

[2] Humboldt Univ, Dept Phys, Newtonstr 15, D-12489 Berlin, Germany

[3] Chalmers Univ Technol, Dept Microtechnol & Nanosci MC2, Terahertz & Millimeter Wave Lab, S-41296 Gothenburg, Sweden

[4] Low Noise Factory AB, S-41263 Gothenburg, Sweden

[5] Leibniz Inst Forsch Verbund Berlin eV, Paul Drude Inst Festkorperelektron, Hausvogteipl 5-7, D-10117 Berlin, Germany

来源：

OPTICS EXPRESS | 2023年 / 31卷 / 09期

关键词：

PHASE-LOCKING; LINEWIDTH; SPECTROSCOPY; TEMPERATURE;

D O I：

10.1364/OE.483883

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate the frequency stabilization of a terahertz quantum-cascade laser (QCL) to the Lamb dip of the absorption line of a D2O rotational transition at 3.3809309 THz. To assess the quality of the frequency stabilization, a Schottky diode harmonic mixer is used to generate a downconverted QCL signal by mixing the laser emission with a multiplied microwave reference signal. This downconverted signal is directly measured by a spectrum analyzer showing a full width at half maximum of 350 kHz, which is eventually limited by high-frequency noise beyond the bandwidth of the stabilization loop.

引用

页码：13888 / 13894

页数：7

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