Biographical Information Dr. Wei-lou Cao (301)405-3729 (o) (301)422-9074 (h) wlcao@eng.umd.edu 1. Field of Specialization Ultrafast Opto-Electronics with Semiconductor and High Temperature Superconductor, Diode-Pumped Solid State Lasers and Nonlinear Optics, Single Photon Detection Technology and Optical Oscilloscopes, X-Ray Image Intensifier and X-Ray Microscopes. 2. Personal Data U.S. Permanent Resident Permanent Address: 3422 Rutgers Street Hyattsville, MD 20783 (301)422-9074 3. Education B.S. University of Science and Technology of China (Quantum Electronics), 1966 M.S. Shanghai Institute of Optics and Fine Mechanics(SIOM), Chinese Academy of Sciences (Applied Physics),1972 Ph.D. SIOM, Chinese Academy of Sciences (Applied Physics),1978 4. Professional Career Dec. 1990--Present Assistant Research Scientist, Department of Electrical Engineering, University of Maryland, College Park, Maryland, U.S.A. Jan. 1988--Nov. 1990 Professor, Director CITIC-Jiading Opto-Electronics Laboratory, Shanghai, China Mar. 1983--Dec. 1987 Associate Professor, Director of Ultrashort Laser Group, SIOM, Chinese Academy of Sciences, Shanghai, China. Mar. 1980--Jan.1983 Research Associate, Department of Electrical Engineering and Physics Department, University of Maryland College Park, Maryland, U.S.A. 5. Award Recipient of First Class Science Progress Award (1981,1986,1988) from Chinese Academy of Sciences 6. Collaborations and References Prof. Chi H. Lee Department of Electrical Engineering University of Maryland College Park, MD 20742 Phone No.: (301)405-3739 Prof. C.O. Alley Department of Physics and Astronomy University of Maryland College Park, MD 20742 Phone No.: (301)405-6098 Prof. Yanhua Shih Department of Physics University of Maryland Baltimore County Baltimore, MD 21228 Phone No.: (301)410-2558 7. Experience In recent years, Dr. Cao has been mainly engaged in the following research projects: 1) Ultrafast opto-electronics with high temperature superconductor(HTS) devices(1991-present) 2) Diode-pumped ultra-stable picosecond and femtosecond solid state lasers(1991-present) 3) X-ray image intensifier, Portable X-ray imagescope and X-ray microscopes(1988-present) 4) Single photon detection technology and absolute quantum efficiency calibration for photoelectron devices (1994-present) 5) Space time measurements for GPS modification using continuously circular sweeping picosecond streak camera (optical oscilloscope) (1994-present) Before 1990, following projects were completed: 1) Pumping thermodistortion and laser induced damage in Nd:glass laser amplifier(1968) 2) Experimental studies of disk amplifiers of Nd:glass laser(1970) 3) Q-switched unstable cavity Nd:glass laser oscillator (1971) 4) Experimental study on 1010 W Nd:glass laser fusion system(1972) 5) Mode-locked Nd:glass and Nd:YAG oscillators (1972) 6) Experimental study on laser interaction with LiD and frozen D2(1972 - 1974) 7) Small scale laser self-focusing in laser material and spatial filtration of the high power laser beam (1975 - 1976) 8) Experimental study on six-beam Nd:glass laser system(1976 - 1978) 9) Pointing and focusing of the six-beam Nd:glass laser fusion system (1978) 10) Measurement of the optical length differences of the six laser beams (1979) 11) Spatially resolved measurements of the X-ray line radiation of the laser plasma (1977) 12) Interaction of multiple high power laser beams with glass microballoon for plasma compression (1977 - 1979) 13) Identification of laser-produced plasma X-ray (LPX) spectral lines in Cu and glass targets (1977) 14) Two-photon pumped semiconductor lasers (1980 - 1982) 15) Multikilovolt picosecond opto-electronic switches(1980 - 1982) 16) Picosecond photoconductivity in semiconductors and its applications(1980 - 1982) 17) High average power, high brightness ranging lasers(1980 - 1982) 18) High repetition rate quasi-cw prelase or pulsed prelase Q-switched single axial mode Nd:YAG and Nd:YLF oscillators for laser fusion system(1983 - 1986) 19) High repetition rate quasi-cw prelase mode-locked and Q-switched Nd:YAG and Nd:YLF oscillators for laser fusion system (1985 - 1988) 20) Laser pulse compression and frequency shifting for laser plasma probing (1983 - 1988) 21) Synchronously pumped quasi-cw mode-locked dye lasers for laser plasma probing(1985 - 1987) 22) High power Nd:YAG disk laser with 40 mm clear-aperture(1985 - 1990) 23) Quasi-cw mode-locking of the athermal phosphate Nd:glass oscillators (1986) 24) 10 pps, 2 ps, 1 joule phosphate Nd:glass laser for X-ray lithography(1988-1990) 8. Publications in International Journals and proceedings 1) Generation of picosecond pulses of amplified spontaneous emission by two photon excitation in GaAs Wei-lou Cao, Aileen N. Vaucher, and Chi H. Lee Appl. Phys. Lett., Vol. 38, No. 5, pp.306 (1981) 2) Synchronously pumped mode-locked GaAs laser Wei-lou Cao, Aileen N. Vaucher, and Chi H. Lee Appl. Phys. Lett., Vol. 38, No. 9, pp.653 (1981) 3) Multikilovolt Picosecond Opto-Electronic Switching in CdS0.5Se0.5 V.K. Mathur, C.S. Chang, W.L. Cao, M.J. Lee, and C.H. Lee IEEE Journal of Quantum Electronics Vol.QE-18, No.2, pp. 205 (1982) Vol.QE-17, No.12, part II pp.136 (1981) 4) Generation of tunable picosecond pulses from a bulk GaAs laser Wei-lou Cao, A.M. Vaucher, Jun-da Ling and Chi H, Lee IEEE Journal of Quantum Electronics Vol. QE-17, No.12, part II pp.68 (1981) Vol. QE-18, No.2, pp.187 (1982) 5) Picosecond photoconductivity and its applications Chi H. Lee, V.K. Mathur, Wei-lou Cao, P.S. Mak, C.S. Chang SPIE Vol.322 Picosecond Laser and Applications pp.100(1982) 6) Two-photon Pumped synchronously mode-locked bulk GaAs laser W.L. Cao, A.M. Vaucher, J.D. Ling, C.H. Lee SPIE VOl.322 Picosecond Laser and Applications pp.37(1982) 7) The new university of maryland ranging laser, with C.O. Alley, Proceedings of the Fourth International Workshop on Laser Ranging Instrumentation (1981) 8) High peak power synchronously pumped semiconductor laser via two photon absorption W.L. Cao, F.M. Tong,D.S. Shao, V.K. Mathur, C.H. Lee Appl. Phys. (B) Vol.28, No.2/3, pp.213 (1982) 9) Wide bandwidth, high-repetition rate optoelectronic modulation of millimeter waves in GaAs waveguide M.G. Li, W.L. Cao, V.K. Mathur, C. H. Lee Electronics Letters Vol.18, No.11, pp.454 (1982) 10) Picosecond optoelectronic modulation of millimeter waves in GaAs waveguide M.G. Li, W.L. Cao, V.K. Mathur, C. H. Lee Picosecond Phenomena III, pp.145 (1982) Springer, New York 11) Two photon pumped semiconductor lasers for the generation of picosecond pulses W.L. Cao, F.M. Tong, D.S. Shao, V.K. Mathur, C.H. Lee Picosecond Phenomena III, pp.57 (1982) Springer, New York 12) Some recent development of high power laser techniques and laser plasma research in Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, with Deng Xi-ming First International Laser Science Conference, Las Vego, USA(1985) Bulletin of the American Physical Society, Vol.30, No.10, pp.1794 (1985) 13) New laser developments toward a centimeter accuracy lunar ranging system S.R. Bowman, C.O. Alley, J.J. Degnan, W.L. Cao Fifth International Workshop on Laser Ranging Instrumentation, Herstmonceux Castle, England. Sep.(1984) 14) 40 mm Clear Aperture Nd:YAG Disk Laser Wei-lou Cao, Mei-zhen Zhang, Qin-hao Chen Optics News, Vol. 12, No. 9, p. 208 (1986) Journal of the Optical Society of America (A) Vol.3, No. 13, p.109 (1986) 15) Investigation on Characteristics of Quasi-Cw Modelocked Nd:doped laser Pulses Cao Weilou, Chen Qinhao Digest of International Conference on Lasers, Nov. 1987(p.17) Xiamen, China 16) Characteristics of Nd:YLF active/passive mode-locked laser under the influences of different saturable absorbers Chen Youming, Cao Weilou Digest of International Conferences on Lasers. p.29 Nov., 1987 Xiamen, China 17) Characteristics of large aperture Nd:YAG disk laser for multikilowatt average power Wei-lou Cao and Mei-zhen Zhang International Conference on High Power Solid State Lasers 19-23 Sept.,1988,Hamburger,F.R.G. 18) Picosecond Superconductor Opening Switches Wei-lou Cao, Yuan-Qun Liu, Chi H. Lee, S. N. Mao, S. Bhattacharya, X. X. Xi, T. Venkatesan, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz and William L. Holstein IEEE Transactions on Applied Superconductivity, Vol. 3, No.1, 2848, 1993 19) Nanosecond Inductive Energy Storage Pulsed Power System Using YBCO Superconductor Opening Switches Wei-lou Cao, Yuan-Qun Liu, Chi H. Lee, S. N. Mao, X. X. Xi, and T. Venkatesan IEEE Photonics Tech. Lett., Vol.5, 109, 1993 20) Optically Controlled Picosecond Superconductor Opening Switches Yuan-Qun Liu, Wei-lou Cao, Chi H. Lee, S. N. Mao, X. X. Xi, T. Venkatesan, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz and William L. Holstein PROCEEDING OF FIFTH SDIO/ONR PULSE POWER MEETING 1992, August 17-19,1992, College Park, Maryland. pp.147-151 21) High Tc Superconductor Opening Switches for Picosecond Pulsed Power System Wei-lou Cao, YuanQun Liu, Chi H. Lee, T. Venkatesan, X. X. Xi and S. N. Mao Optically Activated Switching, OE LASE '93, Jan., 1993, Los Angeles. 22) Optical Control of High Speed Circuit Using Picosecond High Temperature Superconductor Opening Switches Yuan-Qun Liu, Yi-Sern Lai,Wei-lou Cao, Chi H. Lee, S. N. Mao, X. X. Xi, T. Venkatesan, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz and William L. Holstein Ultrafast Electronics & Optoelectronics, Jan., 1993, San Francisco. 23) Picosecond Photoresistive Superconductor Switch for Ultrawide-Band Electrical Pulse Forming Wei-lou Cao, YuanQun Liu, Chi H. Lee, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz and William L. Holstein CLEOU93, May, 1993, Baltimore. 24) Microwave Generation Using Laser Activated High Tc Superconductors Wei-lou Cao, YuanQun Liu, YiSern Lai, Sheng-Lung L. Huang, Vutthi Bhanthumnavin, Chi H. Lee, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz, and William L. Holstein Optical Microwave Interactions, July 19-21, 1993, Santa Barbara, CA 25) Ultra-Widerband Pulse Generation and Radiation Using High Tc Superconductor Opening Switch Y.S.Lai, E.E.Funk, W.L.Cao, Chi H.Lee, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz, and William L. Holstein Appl. Phys. Lett., 65(8), 1048, 22 August 1994 26) 500 Hz Picosecond Inductive Energy Storage Pulsed Power System Using a High Tc Superconductor Opening Switch Y.S.Lai, Wei-lou Cao, E.E.Funk, Chi H. Lee, S. N. Mao, X. X. Xi, and T. Venkatesan IEEE Photonics Tech. Lett., Vol. 6, No. 10, October 1994 27) Picosecond Optical Response of Tl2Ba2CaCu2O8 and Tl0.5Pb0.5Sr2(Ca0.8Y0.2)Cu2O7 High Tc Superconductor Films Y.S.Lai, Y.Q.Liu, W.L.Cao, Chi H.Lee, Zhi-Yuan Shen, Philip Pang, Dennis J. Kountz, and William L. Holstein Appl. Phys. Lett., 66(9), 1135, 27 February 1995 9. Publications in Chinese Journals More than 30 papers not for external distribution before 1978. The papers from 1978 to present are as followings: 1) Spatially resolved measurements of X-ray line radiation of laser implosion microballoons Cao, Wei-lou Zhang,wei-qing and Lu,Xi-nan KEXUE TONGBAO (Science Letters) Vol.17,pp.782 (1979) 2) Identification of laser-produced plasma X-ray (LPX) spectral lines in Cu and glass targets with Lu,Ren-xiang KEXUE TONGBAO (Science Letters) Vol.23,pp.1071 (1979) Chinese Journal of Lasers Vol.5-6,pp.5 (1978) 3) The maximum focusable power density of the intense laser beam and its spatial filtration Cao,wei-lou Chinese Journal of Lasers Vol. 5-6,pp.11 (1978) 4) Experimental study of laser interaction with microballoons by using six laser beams with Deng, Xi-ming and Yu, Wen-yan Chinese Journal of Lasers Vol.5-6, pp.9 (1978) 5) Generation of neutrons from frozen D2 and LiD targets heated by a 1010 W laser beam with Deng,Xi-ming and Yu,Wen-yan KEXUE TONGBAO (Science Letters) Special Issue of Mathematics, Physics and Chemistry,pp.151 (1980) 6) Experimental study on the dynamics of the microballoons irradiated with multi laser beams with Deng,Xi-ming and Yu,Wen-yan KEXUE TONGBAO (Science Letters) Special Issue of Mathematics, Physics and Chemistry,pp.155 (1980) 7) Quasi-cw single axial mode Nd:YAG laser Cao, Wei-lou Sun, Yun-long and Zhu,Zhi-ming Laser and Infra-red Vol.9, pp.28 (1984) 8) The generation of microwave pulses by a single picosecond laser pulse and three semiconductor opto-electronic switchers Cao, wei-lou and Zhang,Mei-zhen Laser and Infra-red, Vol.9, pp.13 (1984) 9) The selection of single axial mode solid state lasers with Sun,Yun-long Laser and Infra-red, Vol.2, pp.35 (1984) 10) A high average power, short pulse, Nd:YAG laser to achieve centimeter accuracy lunar ranging with modest size telescopes with C.O. Alley Digest of International Conference on Lasers, Guangzhou, China pp.203 (1983) 11) A highly stable Nd:YAG ranging laser with M.Z. Zhang Digest of International Conference on Lasers, Guangzhou, China pp.513 (1983) 12) Optical resonant reflector and its application in laser techniques with Zhu,Zhi-min and Deng,Xi-ming Acta Optica Sinica, Vol.6, No. 1,pp.6 (1986) 13) Investigation of single axial mode Nd:YAG and ND:YLF oscillators for laser fusion Cao, Wei-lou Chen,Qin-hao Zhu,Zhi-min and Deng, Xi-ming Acta Optica Sinica, Vol. 6, No.9, pp.1 (1986) 14) The stabilization investigation of the quasi-CW prelase Q-switched single frequency laser oscillator with Chen Qin-hao Chinese Journal of Lasers, Vol.13, No.9, pp.601 (1986) 15) Physical design and experimental study for the single axial mode solid state laser Cao Wei-lou, Chen Qin-hao, Zhu Zhi-min and Deng Xi-ming Chinese Journal of Lasers, Vol. 13, No. 9, pp.561 (1986) 16) Nd:YLF single axial mode oscillator for phosphate Nd:glass laser fusion system with Chen Qin-hao, to be published 17) Periodic damage induced by spatial break-up of the intense laser beam in the optical material Cao Wei-lou and Deng Xi-ming Chinese Journal of Lasers, Vol. 13, No. 9, pp.548 (1986) 18) The applications of the picosecond photoconductivity in the laser and microwave technology with M.Z. Zhang, to be published 19) Photoconductivity and photoluminescence in CdS0.5Se0.5 under picosecond laser pulse excitation with Chi H. Lee and De-sen Shao Chinese Journal of Lasers, Vol.13, No.9, pp.513 (1986) 20) The design and experiment for high repetition rate 40 mm aperture Nd:YAG disk laser Cao Wei-lou, Chen Qin-hao, Zhang Mei-zhen and Deng Xi-ming Chinese Journal of Lasers, Vol. 13, No. 9, pp. 562 (1986) 21) Simulated analyses and relative experimental results of the transient mode-locking of the synchronously pumped Rd6G dye laser with Luo Ning-yi, Acta Optica Sinica, Vol. 6, No. 9, pp.789(1986) 22) The compression of the synchronously pumped dye laser pulse with a saturable absorber in the cavity with Luo Ning-yi, to be published in Chinese Journal of Lasers 23) Dependence of transient mode locking of synchronously pumped dye laser on negative cavity length mismatching with Luo Ning-yi, Chinese Journal of Lasers, Vol.13, No.9, pp.544 (1986) 24) Influence of polarizing direction of pumping pulse and solvent viscosity on pulse width of synchronously pumped and mode locked dye laser light with Luo Ningyi, Chinese Journal of Lasers, Vol. 14, No. 3, pp.144 (1987) 25) The high repetition rate phosphate Nd:glass slab laser Cao wei-lou and Zhang Meizhen, Chinese Journal of Lasers, 1987 26) Quasi-CW actively mode-locked and Q-switched Nd:YLF oscillator Cao Weilou, Chen Qinhao ACTA OPTICA SINICA, Vol. 7, No. 11, pp.961 (1987) 27) Intracavity frequency doubling of the quasi-CW mode-locked Nd:YAG laser Cao Wei-lou and Chen Qin-hao, ACTA OPTICA SINICA, 1988 28) Synchronously pumped quasi-CW mode-locked dye lasers Cao Wei-lou Luo Ning-yi and Chen Qin-hao, ACTA OPTICA SINICA, 1988 29) Quasi-CW and CW mode-locking of the athermal phosphate Nd:glass oscillators Cao Wei-lou and Chen Qin-hao, 1988 30) High efficiency, high resolution X-ray cathode for hard X-ray imaging Chinese Physics, 1989 31) Laboratory X-ray microscope with a magnification of 20 Chinese Physics, 1989 32) Portable X-ray image scope Chinese Physics, 1990 10. Patents United States Patents: I. X-ray to visible image converter with a cathode emission layer having non-uniform density profile structure, Patent Number: 5,225,670 II. Compound X-ray cathode for X-ray image intensifier, Patent Number: 5,285,061 III. X-ray microscope with a direct conversion photocathode, Patent Number: 5,351,279