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High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz
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10.1063/1.3599518
/content/aip/journal/apl/98/23/10.1063/1.3599518
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/23/10.1063/1.3599518
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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 .

Image of FIG. 4.
FIG. 4.

QCL emission frequency as a function of bias voltage. The inset shows the measured QCL frequency at different bath temperature.

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/content/aip/journal/apl/98/23/10.1063/1.3599518
2011-06-09
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/23/10.1063/1.3599518
10.1063/1.3599518
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