Three-dimensional speckle imaging employing a frequency-locked tunable diode laser

Bret D. Cannon; Bruce E. Bernacki; John T. Schiffern; Albert Mendoza

doi:10.1117/12.2188470

1 September 2015 Three-dimensional speckle imaging employing a frequency-locked tunable diode laser

Bret D. Cannon, Bruce E. Bernacki, John T. Schiffern, Albert Mendoza

Proceedings Volume 9576, Applied Advanced Optical Metrology Solutions; 957604 (2015) https://doi.org/10.1117/12.2188470
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

We describe a high accuracy frequency stepping method for a tunable diode laser to improve a three dimensional (3D) imaging approach based upon interferometric speckle imaging. The approach, modeled after Takeda, exploits tuning an illumination laser in frequency as speckle interferograms of the object (specklegrams) are acquired at each frequency in a Michelson interferometer. The resulting 3D hypercube of specklegrams encode spatial information in the x-y plane of each image with laser tuning arrayed along its z-axis. The specklegrams are processed by Fast Fourier Transformation (FFT) along the z-axis of the hypercube and the center of the peak in the resulting power spectrum for each pixel encodes its surface height. Alternatively, Takeda’s method can be followed which uses the phase of the FFT, unwraps it, and determines the surface height encoded in the slope of a line fitted to the phase. Wraparound of modulations above the Nyquist limit results in ambiguity in the optical path difference (OPD) between test and reference surfaces. Wraparound also amplifies measurement noise caused by errors and jitter in frequency stepping the illumination laser. By locking the laser frequency to successive cavity modes of a reference confocal interferometer, tuning is precisely controlled resulting in dramatically improved imaging quality/. We present laboratory data of before and after results showing enhanced 3D imaging resulting from precise laser frequency control.

Citation Download Citation

Bret D. Cannon, Bruce E. Bernacki, John T. Schiffern, and Albert Mendoza "Three-dimensional speckle imaging employing a frequency-locked tunable diode laser", Proc. SPIE 9576, Applied Advanced Optical Metrology Solutions, 957604 (1 September 2015); https://doi.org/10.1117/12.2188470

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KEYWORDS

3D image processing

Laser stabilization

Servomechanisms

Tunable diode lasers

Actuators

Beam controllers

Speckle imaging

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