Higher moments of scattered light fields by heterodyne analysis.

In heterodyne detection (such as in coherent lidar) the optical local oscillator defines a single mode of the incoming-signal light field; this single-mode selectivity has been previously predicted to preserve the full fluctuation character of scattered light. This is in contrast with direct-detection schemes, as in photon-correlation spectroscopy, where aperture averaging usually reduces the range of fluctuations. Examples of Gaussian and non-Gaussian statistics in laser light scattered from a moving ground-glass screen have been studied. This simple laboratory experiment has several advantages over equivalent direct-detection schemes and has been shown to yield experimentally the theoretically predicted factorial intensity moments (up to the seventh order) that result from zero-mean, circulo-complex Gaussian statistics.

[1]  E. Staples,et al.  Particle size measurements on turbid latex systems using heterodyne intensity autocorrelation spectroscopy , 1981 .

[2]  LETTERS TO THE EDITOR: Measurements of the factorization properties of higher-order optical correlation functions , 1968 .

[3]  S. Sasaki,et al.  Equipment for photon correlation spectroscopy measurements in the heterodyne mode , 1984 .

[4]  R. Tuft,et al.  Photon-Count Distributions and Irradiance Fluctuations of a Log-Normally Distributed Light Field* , 1972 .

[5]  Light scattering and intensity fluctuation spectroscopy , 1975 .

[6]  E. Jakeman,et al.  Spectral Filtering of Light Possessing Non-gaussian Statistics , 1994 .

[7]  J. Vaughan,et al.  Correlation Analysis of Fluctuations in Coherent Lidar Signals at 10·6 μm , 1991 .

[8]  M. Davies.  Dielectric and Related Molecular Processes , 1977 .

[9]  J. Shapiro.  Correlation scales of laser speckle in heterodyne detection. , 1985, Applied optics.

[10]  R G Brown.  Dynamic light scattering using monomode optical fibers. , 1987, Applied optics.

[11]  R. Keeler,et al.  Characteristics of coherent lidar returns from calibration targets and aerosols. , 1981, Applied optics.

[12]  N Menyuk,et al.  Experimental comparison of heterodyne and direct detection for pulsed differential absorption CO2 lidar. , 1983, Applied optics.

[13]  E. Jakeman,et al.  Non-Gaussian fluctuations in electromagnetic radiation scattered by random phase screen. I. Theory , 1975 .

[14]  B. J. Rye,et al.  Optimal truncation and optical efficiency of an apertured coherent lidar focused on an incoherent backscatter target. , 1992, Applied optics.

[15]  J. Goodman.  Some fundamental properties of speckle , 1976 .

[16]  E. V. Hoversten.  Optical communication theory. , 1972 .

[17]  Y. Yeh,et al.  Observation of Diffusion Broadening of Rayleigh Scattered Light , 1964 .

[18]  J. Rička,et al.  Dynamic light scattering with single-mode and multimode receivers. , 1993, Applied optics.

[19]  J. Churnside,et al.  Statistical Properties of Estimates of the Moments of Laser Scintillation , 1989 .

[20]  D. Jordan,et al.  Measurements of Gaussian Speckle Statistics Using Both Direct and Heterodyne Detection of CO 2 Laser Radiation , 1983 .

[21]  A. Siegman,et al.  The antenna properties of optical heterodyne receivers. , 1966, Applied optics.

[22]  E. Pike,et al.  LETTERS TO THE EDITOR: A measurement of optical linewidth by photon-counting statistics , 1968 .

[23]  D Letalick,et al.  Measured signal amplitude distributions for a coherent FM-cw CO2 laser radar. , 1986, Applied optics.

[24]  T. King,et al.  A heterodyne photon correlation spectrometer of advanced design , 1985 .

[25]  P. Flamant,et al.  Evidence for speckle effects on pulsed CO2 lidar signal returns from remote targets. , 1984, Applied optics.

[26]  G. Parry,et al.  K distributions in atmospheric propagation of laser light , 1979 .

[27]  R. Menzies,et al.  Atmospheric correlation-time measurements and effects on coherent Doppler lidar , 1987 .

[28]  R. Loudon,et al.  Optical Amplification and Spontaneous Emission in an Ar + Discharge , 1992 .