Heterodyne detection of enhanced backscatter

Optics Letters
M PitterM Harris

Abstract

Heterodyne detection has been used to measure the enhanced backscattering from a standard target consisting of a plane mirror positioned behind a moving ground-glass disk (assumed to act as a phase screen). A tilt of the plane mirror in combination with spectral filtering of the detector output allows isolation of the double-scattered component of the light signal. When the illuminating laser and the local oscillator beams are correctly mode matched, the intensity of this signal displays the factor-of-2 increase that denotes full coherent enhancement. This full enhancement is preserved for a wide range of mirror to phase-screen spacing, in contrast with earlier observations in which direct-detection techniques were used.

References

Oct 20, 1994·Applied Optics·M HarrisJ M Vaughan
Jul 1, 1996·Applied Optics·D L JordanE Jakeman

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