NDLI: Exploring the nature of excess quantum noise

Content Provider	IEEE Xplore Digital Library
Author	Woerdman, J.P. Van Eijkelenborg, M.A. Van Exter, M.P. Lindberg, A.M.
Copyright Year	1998
Description	Author affiliation: Huygens Lab., Leiden Univ., Netherlands (Woerdman, J.P.)
Abstract	We report here on a series of experiments aimed at a better understanding of excess quantum noise. Our experimental system is a miniature HeXe laser (L=5 cm, /spl lambda/=3.51 /spl mu/m). We start by comparing the quantum phase noise of a geometrically unstable and a geometrically stable HeXe cavity, with the same diffraction loss rate (realized by using a sufficiently small outcoupling mirror for the stable laser). Experimentally, we find K/sub unstable//spl sim/220 and K/sub stable//spl sim/5, showing that losses are not the key issue. In fact, these values are in good agreement with the mode-nonorthogonality theory. The data for K/sub stable/ are best fitted by the curve K/sub trans/K/sub long/, showing that the excess quantum noise can be factorized, as is expected within the paraxial approximation. We observed this factorizability also for K=K/sub trans/K/sub pol/, using a cavity with nonorthogonal transverse and polarization eigenmodes; nonorthogonality of the latter was realized by dissipative coupling of two circularly polarized modes, using a quasi-Brewster-plate in the HeXe cavity. We also report the appearance of the K factor in the intensity noise of an unstable HeXe laser (all reports so far dealt with phase noise). We measured intensity noise spectra, both below and above threshold. We extract K from these data using a phenomenological laser model in which one of the spontaneous emission decay channels, namely, the laser mode, has been given a K times larger weight than the other channels. K values deduced from intensity noise were found to be consistent with those derived from phase noise.
Starting Page	196
Ending Page	197
File Size	303153
Page Count	2
File Format	PDF
ISBN	1557525412
DOI	10.1109/IQEC.1998.680400
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-05-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Optical Soc. Of America
Subject Keyword	Laser noise Phase noise Laser modes Polarization Diffraction Mirrors Laser stability Laser theory Noise measurement Data mining
Content Type	Text
Resource Type	Article

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