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Calculated emission spectra of methanol at a pressure of 1 mbar at 300 K for a 41 cm optical path length. The red arrow indicates the tuning range of the LO frequency. The left and right shadow regions of the LSB and USB correspond to the detection band of the FFTS for the IF signal by using a 0–1.5 GHz low pass filter.
Experimental and simulated methanol spectral lines as a function of frequency at different gas pressure with a LO frequency of 3450.232 GHz. (a) The low pressure spectrum; (b) the high pressure data.
Measured methanol spectra with different LO frequency, which is tuned with the bias voltage of the QCL from 14.05 to 14.99 V. The gas pressures for all spectra are at .
QCL emission frequency as a function of bias voltage. The inset shows the measured QCL frequency at different bath temperature.
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