M. Harris’s scientific contributions

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Publications (1)


Experimental delayed self-heterodyne fiber interferometer: OI, optical isolator; FC's, fiber couplers; AOM, acousto-optic modulator; FPC, fiber polarization controller. BPF1 and PBF2 are the two bandpass filters; cross correlation of their outputs is subsequently evaluated.
Double filtering of the laser spectrum. The filters have a roughly Gaussian-shaped transmission function and are positioned symmetrically on either side of the Lorentzian-shaped laser profile. Note that the laser width Γ appears doubled in the delayed self-heterodyne spectrum.4 The two transmitted signals are individually processed to give two separate power/intensity time series. The cross correlation between these is then calculated, and the experiment is carried out for a range of filter widths and spacings.
(a) Portion of the two experimental intensity time series I 1 t and I 2 t obtained for zero detuning ( Δ = 1 MHz , δ = 0 ) . The two traces should then be identical, and are indeed seen to lie almost one on top of the other. (b) Time series I 1 t and I 2 t measured close to the minimum (peak anticorrelation) of Fig.  4 ( Δ = 1 MHz , δ = 2 MHz ) . The anticorrelation is dramatically obvious, with the peaks of one trace clearly tending to coincide with the troughs of the other.
Plot of experimentally determined cross correlation versus filter separation for a range of filter widths. At larger detuning, the outputs become highly anticorrelated. At very large detuning, a small positive correlation is apparent for the two largest filter widths.
Intensity correlations in filtered phase-diffusing light
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April 1998

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1 Citation

M. Harris

Light undergoing phase diffusion displays a Lorentzian line shape: Here, electrical filtering techniques are used to examine the correlations among different spectral regions under this line shape. The experiment involves delayed self-heterodyne measurements of the output from a single-mode semiconductor laser. Two filters are tuned to isolate the signal contributions from opposite wings of the spectrum, and the transmitted intensities are shown to be strongly correlated in some regimes and strongly anticorrelated in others.

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Citations (1)


... The detector signals at the two intermediate frequencies were envelope detected 16 and then analyzed to extract the intensity cross-correlation coefficient. 24 Because the two receive channels share a common path within single-mode optical fiber, they are guaranteed to be looking at precisely the same region of the target. The concept of a receive antenna or backpropagated local oscillator ͑BPLO͒ is commonly used in coherent laser radar. ...

Reference:

Improved speckle statistics in coherent differential absorption lidar with in-fiber wavelength multiplexing
Intensity correlations in filtered phase-diffusing light