个人简介

Randy A. Bartels received his Ph.D. from the University of Michigan 2002. His Ph.D. work was performed at JILA in Boulder , CO , where he worked on ultrafast laser development, coherent control of quantum systems, and the study of extreme nonlinear optical processes. Among other advances, this work led to the development of attophysics by manipulating the strong-field dynamics of atomic electron wave functions with ~ 20 attosecond precision. During his graduate career, Randy was supported by a National Defense Science and Engineering Graduate Fellowship and received numerous awards, including the Optical Society of America's New Focus Student Research Award, a JILA scientific achievement award, and selection as a finalist for the DAMOP Thesis Award (winner to be decided in May 2004 at the DAMOP annual meeting). Prior to graduate school, he worked in the Laser Science and Technology division at Lawrence Livermore National Laboratory designing and building diode-pumped solid-state laser systems. Randy joined Colorado State University as an assistant professor in January of 2003. His current research involves the control of molecular coherences for novel nonlinear optics and manipulation of ultrafast optical pulses, as well as development of EUV laser sources and optical systems. He is a member of the Optical Society of America, the American Physical Society, and IEEE.

研究领域

Electrical and Computer Engineering

The research that we do in our group is highly multidisciplinary, drawing on optics, chemistry, biological, and engineering principles. Our group is working to unravel fundamental questions concerning the interaction of femtosecond light pulses with molecules to induce coherent motion in specific degrees of freedom of the molecules. We are seeking to understand the ro-vibrational dynamics of molecules excited by femtosecond laser pulses. Particularly, we wish to understand the limits of control over a specific degree of freedom (e.g., one particular normal vibrational mode in a molecule) when the excitation laser pulse drives the creation of molecular wave packets involving many overtone levels. We are also exploring the coupling of an excited mode to other degrees of freedom in the molecule. This coupling should be strongly enhanced in the limit of strong overtone excitation and for large molecules such as proteins. The temporal dynamics of the molecular ro-vibrational wave packets that are produced in my laboratory create fs time-scale transients in the linear and nonlinear optical susceptibility, resulting in new fundamental dynamical effects for the propagation of femtosecond laser pulses. The research in my laboratory will provide a better understanding of the interaction of shaped femtosecond laser pulses with molecules, the dynamics of their response, and the impact of those dynamics on the propagation of electromagnetic pulses in the molecules. Ultimately, the new knowledge of molecular control will be applied to study and manipulate proteins with light directly in a cellular environment. This new degree of freedom may lead to tools that help uncover the function of many biological molecules in their natural environment.

近期论文

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David G. Winters, Philip Schlup, and Randy A. Bartels, "Subpicosecond fiber-based soliton-tuned mid-infrared source in the 9.7�14.9 um wavelength region," Opt. Lett 35(13), 2179-2181 (2010). Omid Masihzadeh, Philip Schlup, and Randy A. Bartels, "Label-free second harmonic generation holographic microscopy of biological specimens," Opt. Express 18(10), 9840-9851 (2010). David Kupka, Jesse W. Wilson, Omid Masihzadeh, Randy A. Bartels, "Distinguishing bulk and interface modulation of optical third harmonic generation due to coherent optical phonon excitation," Chem. Phys. Lett. 490(1-3), 97-101 (2010). Lina Xu, Philip Schlup, Omid Masihzadeh, Randy A. Bartels, and Rick Trebino, "Analysis of the measurement of polarization -shaped ultrashort laser pulses by tomographic ultrafast retrieval of transverse light E-fields (TURTLE)," J. Opt. Soc. Am. B 26(12), 2363-2369 (2009). Philip Schlup and Randy A. Bartels, "Impact of Measurement Noise in Tomographic Ultrafast Retrieval of Transverse Light E-Fields (TURTLE) Ultrashort Polarization Characterization," IEEE J. Photon. 1(2), 163-171 (2009). Robert Schoonover, Brynmor Davis, Randy Bartels, and P. Scott Carney, "Propagation of spatial coherence in fast pulses," upcoming in J. Opt. Soc. Am. A (2009). David Kupka, Philip Schlup, and Randy A. Bartels, "Simplified ultrafast pulse shaper for tailored polarization states using a birefringent prism," Rev. Sci. Intsrum. 80, 053110 (2009). Omid Masihzadeh, Philip Schlup, and Randy A. Bartels, "Enhanced spatial resolution in third-harmonic microscopy through polarization switching," Opt. Lett. 34(8), 1240-1242 (2009). Omid Masihzadeh, Philip Schlup, and Randy A. Bartels, "Control and Measurement of Spatially Inhomogeneous Polarization Distributions in Third Harmonic Generation Microscopy," Opt. Lett. 34(7), 1090-1092 (2009). Philip Schlup, Jesse W. Wilson, and Randy A. Bartels, "Sensitive and selective detection of low-frequency vibrational modes through a phase-shifting Fourier transform spectroscopy," IEEE J. Quantum Electron. 45(7), 777-782 (2009). Klaus Hartinger and Randy A. Bartels, "Enhancement of third harmonic generation by a laser-induced plasma," Appl. Phys. Lett. 93, 151102 (2008). Klaus Hartinger and Randy A. Bartels, "Modulation of third-harmonic generation conversion in the presence of a rotational wave packet," Opt. Lett. 33(11), 1162-1164 (2008). Jesse W. Wilson, Philip Schlup, and Randy A. Bartels, "Phase measurement of coherent Raman vibrational spectroscopy with chirped spectral holography," Opt. Lett. 33(18), 2116-2118 (2008). Jesse W. Wilson, Philip Schlup, and Randy A. Bartels, "Synthetic temporal aperture coherent molecular phase spectroscopy," Chem. Phys. Lett. 463(4-6), 300-304 (2008). Robert W. Schoonover, Brynmore J. Davis, Randy. A. Bartels, and P. Scott. Carney, "Optical Interferometry with pulsed fields," J. Mod. Opt. 55(10), 1541-1556 (2008). David Kupka, Philip Schlup, and Randy A. Bartels, "Self-referenced interferometric characterization of axicon lenses," Appl Opt. 47(9), 1200-1205 (2008). Jesse W. Wilson, Philip Schlup, Monte Lunacek, Darrel C. Whitley and Randy A. Bartels, "Calibration of liquid crystal ultrafast pulse shaper with common-path spectral interferometry and application to coherent control with a covariance matrix adaptation evolutionary strategy," Rev. Sci. Instrum. 79, 033103 (2008). Klaus Hartinger and Randy A. Bartels, "Analytical model of the effective transient optical response of symmetric-top molecules in the presence of a rotational coherence," J. Opt. Soc. Am. B 25, 407-413 (2008). Klaus Hartinger and Randy A. Bartels, "Single-shot measurement of ultrafast time-varying phase modulation induced by femtosecond laser pulses with arbitrary polarization," Appl. Phys. Lett. 92, 021126, (2008). Philip Schlup, Omid Masihzadeh, Lina Xu, Rick Trebino and Randy A. Bartels, "Tomographic retrieval of the polarization state of an ultrafast laser pulse," Opt. Lett. 33(3) 267-269 (2008). P. W. Wachulak, M. C. Marconi, R. A. Bartels, C. S. Menoni, and J. J. Rocca, "Soft x-ray laser holography with wavelength resolution," J. Opt. Soc. Am. B 25(11) 1811-1814 (2008). P. W. Wachulak, C. A. Brewer, F. Brizuela, C. S. Menoni, W. Chao, E. H. Anderson, R. A. Bartels, J. J. Rocca, and M. C. Marconi, "Analysis of extreme ultraviolet microscopy images of patterned nanostructures based on a correlation method," J. Opt. Soc. Am. B 25, B20-B26 (2008). Omid Masihzadeh, Philip Schlup, and Randy A. Bartels, "Complete polarization state control of ultrafast laser pulses with a single linear spatial light modulator," Opt. Express 15(26), 18025-18032 (2007). Philip Schlup, Jesse W. Wilson, Klaus Hartinger and Randy A. Bartels, "Dispersion balancing of variable-delay monolithic pulse splitters," Appl. Opt. 46(23), 5967-5973 (2007). Jesse W. Wilson, Philip Schlup and Randy A. Bartels, "Ultrafast phase and amplitude pulse shaping with a single, one-dimensional, high-resolution phase mask," Opt. Express 15(14), 8979-8987 (2007). David G. Winters, Philip Schlup and Randy A. Bartels, "Highly achromatic Fourier-transform spectrometer," Opt. Express 15(3), 1361-1368 (2007). P. W. Wachulak, M. C. Marconi, R. A. Bartels, C. S. Menoni, J. J. Rocca, "Volume extreme ultraviolet holographic imaging with numerical optical sectioning," Opt. Express 15(17), 10622-10628 (2007). P. W. Wachulak, R. A. Bartels, M. C. Marconi, C. S. Menoni, J. J. Rocca, Y. Lu, and B. Parkinson, "Sub 400 nm spatial resolution extreme ultraviolet holography with a table top laser," Opt. Express 14(21), 9636-9642 (2006). O. Masihzadeh, M. Baertschy, and R. A. Bartels, "Optimal single-pulse excitation of rotational impulsive molecular phase modulation," Opt. Express 14(6), 2520-2532 (2006). K. Hartinger and R. A. Bartels, "Pulse polarization splitting in a transient wave plate," Opt. Lett. 31(23), 3526-3528 (2006).