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Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
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21. Note the frequency noise presented in Ref. 13 was obtained by driving the QCL with a lead-acid battery. Here the noise is significantly higher owing to the current noise of the power supply.
22.
22. From Ref. 13 we estimate a minimum bandwidth of ∼100 kHz for the PLL that locks the lock-in reference to the signal reference. For the most widely used DSP lock-in amplifiers the PLL bandwidth is of the order of a few tens of Hz. In addition, for our lock-in the reference frequency range is up to 100 kHz, which is well below the typical drift of fbeat, of several MHz/s.
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/content/aip/journal/apl/102/9/10.1063/1.4793424
2013-03-06
2014-07-13

Abstract

We demonstrate a coherent imaging system based on a terahertz (THz) frequency quantum cascade laser (QCL) phase-locked to a near-infrared fs-laser comb. The phase locking enables coherent electro-optic sampling of the continuous-wave radiation emitted by the QCL through the generation of a heterodyne beat-note signal. We use this beat-note signal to demonstrate raster scan coherent imaging using a QCL emitting at 2.5 THz. At this frequency the detection noise floor of our system is of 3 pW/Hz and the long-term phase stability is <3°/h, limited by the mechanical stability of the apparatus.

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Scitation: Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/9/10.1063/1.4793424
10.1063/1.4793424
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