Selected Honors and Awards:
MSU Recognition of Research, Creativity, and Contributions to Economic Development – Partnership with S2 Corporation, Oct 18, 2006.
George Abraham Outstanding Paper Award, GOMACTech 2004, for "Demonstration of the Spatial-Spectral Coherent Holographic Integrating Processor (S2-CHIP) for RF Signal Processing Applications", by K. D. Merkel, Z. Cole, R. K. Mohan and W. R. Babbitt, presented at the GomacTech2003 conference in Tampa, Florida, on April 3, 2003.
Charles and Nora L. Wiley Faculty Award for Meritorious Research and Creativity, 2002.
Biographical Sketch:
B.S. in Physics, 1982 Stanford University
Ph.D. in Physics, 1987 Harvard University
Interests:
Research Areas:
RF Photonics, Optical signal processors, Coherent transients, Persistent spectral holeburning, and Spectral-spatial holography.
Spatial Spectral Holography:
Spatial-spectral holography combines the spatial storage and processing attributes of volume holography with spectral storage and processing attributes of persistent spectral holeburning. Spatial-spectral holographic (SSH) phenomenon encompasses optical coherent transients, photon echoes, and time-domain spectral holeburning. SSH materials have the ability to record the Fourier transforms of two temporally separated, modulated light beams in a spectral hologram analogous to the manner in which angled beams are recorded in spatial holograms. A SSH material is basically a fully programmable spectral-spatial filter with ultra-high spectral resolution and broad processing bandwidth whose impulse response is dictated by the programming pulses and their temporal shapes and their relative delay and direction. An appropriately programmed material processes incoming broadband optical beams by multiplying their Fourier decomposition by the material's programmed frequency response, resulting in a processed output temporal waveform. SSH materials thus offer an unmatched ability to store, process, and route complex broadband optical signals with precise phase and delay control.
Selected Publications:
Publication since 2005:
55) D. E. Benson, J. M. Murray, R. D. Regester III, K. S. Repasky, and W. R. Babbitt, "Normalized differential detection by use of smart pixels with smart," Appl. Opt. 44, 2607 (2005).
56) T. Chang, M. Tian, R. K. Mohan, C. Renner, K. D. Merkel, and W. R. Babbitt, "Recovery of spectral features readout with frequency chirped laser fields," Opt. Lett. 30, 1129 (2005).
57) F. Schlottau, M. Colice, K. H. Wagner, and W. R. Babbitt, "Spectral hole burning for wideband, high-resolution radio-frequency spectrum analysis," Optics Letters, 30, 3003-5 (2005).
58) T. L. Harris, K. D. Merkel, R. K. Mohan, T. Chang, Z. Cole, A. Olson, and W. R. Babbitt, "Multigigahertz range-Doppler correlative signal processing in optical memory crystals," Applied Optics, 45(2), 343-352 (2006).
59) J. Murray, H. Li, M. Tian, T. Chang, and Wm. R. Babbitt, “Efficiency and uniformity considerations in optical coherent transient devices," JOSA B, 23, 795-800 (2006).
60) Y. Li, A. Hoskins, F. Schlottau, K. H. Wagner, C. Embry, and W. R. Babbitt, "Ultrawideband coherent noise lidar range-Doppler imaging and signal processing by use of spatial-spectral holography in inhomogeneously broadened absorbers," Applied Optics, 45, 6409-6420 (2006).
61) R. Krishna Mohan, T. Chang, M. Tian, S. Bekker, A. Olson, C. Ostrander, A.Khallaayoun, C. Dollinger, W.R. Babbitt, Z. Cole, R.R. Reibel, K.D. Merkel, Y. Sun, R. L. Cone, F. Schlottau, and K. H. Wagner, "Ultra-wideband spectral analysis using S2 technology," Accepted for publication in J. Lumin. (2007).
62) I. Zafarullah, M. Tian, T. Chang, and W. R. Babbitt, “Preparation of inverted medium and processing in the inverted medium”, Accepted for publication in J. Lumin. (2007).
63) Z. Cole, P. A. Roos, T. Berg, B. Kaylor, K. D. Merkel, W. R. Babbitt, and R.R. Reibel, "Unambiguous Range - Doppler LADAR processing using 2 GSPS noise waveforms," Accepted for publication in J. Lumin. (2007).
64) W. R. Babbitt, M. A. Neifeld, and K. D. Merkel, " Broadband Analog to Digital Conversion with Spatial-Spectral Holography," Accepted for publication in J. Lumin. (2007).
Grants:
“Spatial-Spectral Coherent Holographic Integrating Processor: S2-CHIP,” USASMDC, PI: K. D. Merkel of Scientific Materials. Sub-contractors: MSU Spectrum PI: W. R. Babbitt and Univ. of Colorado PI: K. H. Wagner, MSU sub: $3,046,375, 8/03-4/07.
"Active Frequency Stabilized Laser Systems for High Performance," S2Corp/SBIR, PI(MSU): W. R. Babbitt, $122,354, 6/6/06-6/7/07.
"Quantum Information Science Research and Technical Assessment," ARO, PI: W. R. Babbitt, $127,329, 10/17/06-4/30/07.
"Broadband Direct Digital Conversion of Diverse Signals on Microwave Carriers," NRO DII, PI: W. R. Babbitt, $399,975, 1/15/07-10/15/07.
Selected Talks:
Invited Talks since 1998:
7) W.R. Babbitt, "Memory processing and routing applications of spatial-spectral holography in ultra-high-speed computing systems," Proceedings of the SPIE, Advanced Optical Memories and Interfaces to Computer Storage, San Diego, CA, July 22-24, 1998, Vol. 3468, 304-11 (1998), Invited Talk.
8) W.R. Babbitt, "Multidimensional signal processing with spatio-spectral holography," Proceedings of the SPIE, Advanced Optical Data Storage: Materials, Systems, and Interfaces to Computers, Denver, CO, July 20-22, 1999 Vol. 3802, 164-72 (1999) , Invited Talk.
9) W. R. Babbitt, "Optical Coherent Transient Signal Correlators: Science and Applications", 2001 Physics of Quantum Electronics Conference, Snowbird, UT , January 2001, Invited Talk.
10) M. Tian, Z. Barber, T. Chang, R. R. Reibel, and W. R. Babbitt (Invited Speaker), "The Effects of Optical Nutation on Stimulated Photon Echoes," Holeburning, Single Molecules, and Related Spectroscopies, November 18-23, 2001, Taipei, Taiwan, Invited Talk.
11) T. L. Harris, K. D. Merkel, R. K. Mohan, and W. R. Babbitt(Invited Speaker), "Range-Doppler radar signal processing with spectral holography," Conference of Laser and Electro-Optics, San Francisco, May, 2004, CLEO/IQEC and PhAST Technical Digest on CDROM (The Optical Society of America, Washington, DC, 2004), CME1, Invited Talk.
12) W. R. Babbitt, "Microwave Signal Processing with Spatial-Spectral Holography," Annual Meeting of LEOS (IEEE Lasers and Electro-Optics Society), Sydney, Australia, October 27, 2005, Invited Talk
13) W. R. Babbitt, "Digitization of Microwave Signals with Spatial Spectral Holography," Optical Fiber Communication Conference & Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), March 25-29, 2007, Anaheim, CA, Invited Talk.
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