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
收藏
页码：13888 / 13894
页数：7
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