Coherence Gated Laser Ray Tracing on an FPGA Architecture.
3D volumetric imaging techniques such as Optical Coherence Tomography (OCT) have been improved with the addition of Adaptive Optics (AO) systems. One limitation of current AO systems is the ability for the wavefront sensor to distinguish between light returned from differing layers of a multilayer sample (such as the human retina). By employing techniques of phase-shifting interferometry within the wave-front sensor light from only the layer of interest may be selected, while rejecting stray light and light from other layers. This has been demonstrated by Wang and Podoleanu using the well-known Shack-Hartmann wavefront sensor (SHWFS). This project is focusing on a less well known wavefront sensor design known as Laser Ray Tracing (LRT), in which a pencil laser beam is used to scan the sample sequentially in time, in contrast with the SHWFS that obtains the entire wavefront profile in parallel. LRT is well suited to be processed in real-time via a field programmable gate array (FPGA) due to the serial nature of the data acquisition process. It is the goal to perform this coherence-gated LRT sensing in real-time for 3D volumetric wavefronts using the principles of time-domain and frequency-domain OCT.
“Measurement of the non-common vertex error of a double corner cube.” Azizi, Alireza; Marcin, Martin; Moore, Douglas; Moser, Steven; Negron, John; Paek, Eung-Gi; Ryan, Daniel; Abramovici, Alex; Best, Paul; Crossfield, Ian; Nemati, Bijan; Neville, Tim; Platt, B.; Wayne, Leonard. SPIE Optics & Photonics, San Diego, California, August 13-17, 2006
“Experimental progress in deep and broadband infrared nulling for TPF-I.” Wallace, J. Kent; Bartos, Randall; Gappinger, Robert; Loya, Frank; Moser, Steven; Negron, John. Direct Imaging of Exo-Planets: Science and Techniques, Nice, France, October 3-7, 2005.
“Kite: Status of the External Metrology Testbed for SIM.” Dekens, Frank G.; Alvarez-Salazar, Oscar; Azizi, Alireza; Moser, Steven; Nemati, Bijan; Negron, John; Neville, Timothy; Ryan, Daniel. SPIE Astronomical Telescopes and Instrumentation, Glasgow, Scotland, June 21-25, 2004.
“Elastic Constants of Face-Centered Cubic and L12 Ni-Si Alloys: Composition and Temperature Dependence.” S.V. Prikhodko, D.G. Isaak, J.D. Carnes, S. Moser, Y. MA, and A.J. Ardell. Metallurgical and Material Transaction A. Volume 34A, September 2003.
“Sensitivity of Optical Metrology Calibration to Measured Corner Cube Retroreflector Parameters for the Space Interferometry Mission.” G. Kuan and S. Moser. Proceedings of SPIE: Interferometry in Space. Volume 4852 August 2002.