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Applied Optics

Applied Optics


  • Vol. 28, Iss. 9 — May. 1, 1989
  • pp: 1638–1642

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

Peter Werle, Franz Slemr, Manfred Gehrtz, and Christof Bräuchle  »View Author Affiliations

Applied Optics, Vol. 28, Issue 9, pp. 1638-1642 (1989)

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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.

© 1989 Optical Society of America

Original Manuscript: July 18, 1988
Published: May 1, 1989

Peter Werle, Franz Slemr, Manfred Gehrtz, and Christof Bräuchle, "Wideband noise characteristics of a lead-salt diode laser: possibility of quantum noise limited TDLAS performance," Appl. Opt. 28, 1638-1642 (1989)

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  28. The expected 6-dB noise reduction in the 1/f region is not seen due to attenuator induced feedback noise adding to the expected 6-dB reduction.

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