Coherent multiwave heterodyne frequency measurement of a far-infared laser by means of a femtosecond laser comb.
Opt Lett
; 30(1): 32-4, 2005 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-15648628
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 670 GHz.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Opt Lett
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Itália