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.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- DOE Contract Number:
- Resource Type:
- Resource Relation:
- Conference: Applied Advanced Optical Metrology Solutions, August 9, 2015, San Diego, California. Proceedings of the SPIE, 9576:Paper No. 957604
- E Novak and JD Trolinger; SPIE, Bellingham, WA, United States(US).
- Research Org:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Org:
- Country of Publication:
- United States
- hree dimensional imaging; three dimensional speckle imaging; laser frequency stabilization; laser speckle imaging