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Title: Three Dimensional Speckle Imaging Employing a Frequency-Locked Tunable Diode Laser

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. We present laboratory data of before and after results showing enhanced 3D imaging resulting from precise laser frequency control.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1222099
Report Number(s):
PNNL-SA-111821
NN2001000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Applied Advanced Optical Metrology Solutions, August 9, 2015, San Diego, California. Proceedings of the SPIE, 9576:Paper No. 957604
Publisher:
E Novak and JD Trolinger; SPIE, Bellingham, WA, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
hree dimensional imaging; three dimensional speckle imaging; laser frequency stabilization; laser speckle imaging