Coherent multiwave heterodyne frequency measurement of a far-infared laser by means of a femtosecond laser comb
Optics Letters, Vol. 30, Issue 1, pp. 32-34 (2005)
http://dx.doi.org/10.1364/OL.30.000032
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Abstract
We demonstrate the possibility of using a femtosecond laser to measure with high accuracy the frequency of a far-infrared (FIR) monochromatic source, such as an optically pumped molecular laser, by generating in a suitable mixer a signal in the radio-frequency region at the frequency difference between n steps of a femtosecond comb and the FIR source. All the couples of modes lying a distance of n steps from one another contribute coherently to the heterodyne signal. The technique has been tested up to 670GHz.
© 2005 Optical Society of America
OCIS Codes
(040.2840) Detectors : Heterodyne
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.4050) Lasers and laser optics : Mode-locked lasers
(260.3090) Physical optics : Infrared, far
Citation
N. Beverini, G. Carelli, A. De Michele, E. Maccioni, B. Nyushkov, F. Sorrentino, and A. Moretti, "Coherent multiwave heterodyne frequency measurement of a far-infared
laser by means of a femtosecond laser comb," Opt. Lett. 30, 32-34 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-1-32
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