Wideband noise characteristics of a lead-salt diode laser: Possibility of quantum noise limited TDLAS performance

Year: 1989

Authors: Werle P., Slemr F., Gehrtz M., Bräuchle C.

Autors Affiliation: Fraunhofer Institute for, 19 Kreuzeckbahnstr, Garmisch-Partenkirchen, D-8100, Germany; IBM Germany, Plant Mainz Laboratories, P.O. Box 2540, Mainz, D-6500, Germany; University of Munich, Institute for Physical Chemistry, 11 Sophienstr, Munich, D-8000, Germany

Abstract: The wideband noise characteristics of a PbEuSe molecular beam epitaxy diode laser have been measured up to 500 MHz. The cutoff of the frequency dependent (1/f type) laser noise contribution was found to be 170 MHz for this particular laser. Above this cutoff frequency the photon shot noise dominates, as was demonstrated. A noise reduction of more than 2 orders of magnitude was observed in the shot noise limited domain when compared with the 1/f noise dominated region below 1 MHz. This finding indicates that a similar 2 orders of magnitude sensitivity improvement can be achieved in tunable diode laser absorption spectroscopy when frequency modulation techniques are applied instead of the more conventional derivative modulation below 1 MHz.

Journal/Review: APPLIED OPTICS

Volume: 28 (9)      Pages from: 1638  to: 1642

KeyWords: DIODE-LASER
DOI: 10.1364/AO.28.001638

Citations: 35
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