Prof. Zenghu Chang
Professor at Univ of Central Florida
SPIE Involvement:
Author
Area of Expertise:
Attosecond science , high harmonic generation , Strong field physics , Ultrafast intense lasers , mid-infrared lasers , Atomic, molecular and optical physics
Websites:
Profile Summary

Coherent X-ray and extreme ultraviolet pulses with attosecond duration are critical tools for observing and controlling electron motions in matter. The generation and characterization of such pulses is a new frontier in ultrafast optics. Zenghu Chang has developed major innovative means for generation and characterization of ultrabroadband single isolated attosecond pulses for pump-probe experiments. He pioneered high harmonic generation in noble gases with long wavelength lasers for extending the cutoff photon energy. In 2001, his group demonstrated the dramatic cutoff extension of high-order harmonic generation in the extreme ultraviolet by driving the nonlinear process with long wavelength optical parametric amplifier lasers [Phys. Rev. A 65, 011804(R) (2001). They also experimentally investigated the effects of quantum diffusion of electron wavepackets on the conversion efficiency of high harmonic generation process for the first time. In 2017, by driving high harmonic generation with a carrier-envelope phase locked laser at 1.7 micron center wavelength and applying polarization gating, single isolated attosecond X-ray pulses in the 50 to 450 eV range were generated in his lab. The measured duration of the X-ray pulse is 53 as [Nature Photonics 8, 186 (2017)], which is the shortest X-ray at the Carbon K-edge (~280 eV). He is currently interested in developing intense MIR lasers for generating keV attosecond pulses [Optics Letters 43, 3381 (2018)] and applying Machine Learning to attosecond science [Optics Express 27, 4799 (2019)].
Publications (21)

Proceedings Article | 14 March 2023 Presentation + Paper
Proceedings Volume 12405, 1240505 (2023) https://doi.org/10.1117/12.2652263
KEYWORDS: Femtosecond phenomena, Quantum efficiency, Optical parametric amplifiers, Laser development, Difference frequency generation, Beam shaping

Proceedings Article | 16 November 2018 Paper
Yingjie Chai, He Cheng, Xiaoming Yu, Andrew Chew, Xiaoming Ren, Zenghu Chang, MJ Soileau
Proceedings Volume 10805, 108050O (2018) https://doi.org/10.1117/12.2501950
KEYWORDS: Laser induced damage, Pulsed laser operation, Femtosecond phenomena, Laser damage threshold, Polarization, Crystals, High power lasers

Proceedings Article | 9 November 2016 Paper
Chaoming Li, Xinrong Chen, Lin Li, Xiaoyang Li, Hang Zha, Jian Yu, Zuyuan Hu, Wenlong Zou, Jianhong Wu, Zenghu Chang
Proceedings Volume 10016, 100161D (2016) https://doi.org/10.1117/12.2244872
KEYWORDS: Diffraction gratings, Diffraction, Optical design, Silica, Pulsed laser operation, Holography, Etching, Laser damage threshold, Lithium, Ion beams

Proceedings Article | 12 May 2015 Paper
Xiaoming Yu, Zenghu Chang, Paul Corkum, Shuting Lei
Proceedings Volume 9511, 95110C (2015) https://doi.org/10.1117/12.2182633
KEYWORDS: Ultraviolet radiation, Laser damage threshold, Electrons, Polarization, Ionization, Infrared imaging, Femtosecond phenomena, Picosecond phenomena, Silica, Scanning electron microscopy

Proceedings Article | 18 November 2014 Paper
Proceedings Volume 9266, 92661N (2014) https://doi.org/10.1117/12.2073545
KEYWORDS: Diffraction gratings, Diffraction, Composites, Silica, Laser damage threshold, Transmittance, Optical design, Sapphire lasers, High power lasers, Reflection

Proceedings Article | 18 November 2014 Paper
Proceedings Volume 9266, 92661K (2014) https://doi.org/10.1117/12.2073548
KEYWORDS: Diffraction gratings, Diffraction, Gold, Sapphire lasers, Optical design, Holography, System on a chip, Femtosecond phenomena, Photoresist materials, Laser development

Proceedings Article | 6 March 2014 Paper
Xiaoming Yu, Qiumei Bian, Zenghu Chang, P. Corkum, Shuting Lei
Proceedings Volume 8968, 89680G (2014) https://doi.org/10.1117/12.2035290
KEYWORDS: Ultraviolet radiation, Electrons, Laser damage threshold, Ionization, Femtosecond phenomena, Silica, Picosecond phenomena, Infrared imaging, Absorption, Extreme ultraviolet

Proceedings Article | 3 October 2007 Paper
Mahendra Shakya, S. Gilbertson, Hiroki Mashiko, C. Nakamura, C. Li, E. Moon, Z. Duan, Jason Tackett, Zenghu Chang
Proceedings Volume 6703, 67030H (2007) https://doi.org/10.1117/12.737600
KEYWORDS: Extreme ultraviolet, Photons, Polarization, Phase measurement, Pulsed laser operation, Aluminum, Microchannel plates, Optical filters, Phase shift keying, Phase matching

Proceedings Article | 17 September 2007 Paper
Proceedings Volume 6703, 67030F (2007) https://doi.org/10.1117/12.737580
KEYWORDS: Polarization, Extreme ultraviolet, Electrons, Mirrors, Wave plates, Chemical species, Pulsed laser operation, Sensors, Quartz, Photoemission spectroscopy

Proceedings Article | 21 September 2005 Paper
Z. Zhao, Zenghu Chang, X. Tong, C. Lin
Proceedings Volume 5920, 592007 (2005) https://doi.org/10.1117/12.616996
KEYWORDS: Extreme ultraviolet, Pulsed laser operation, Polarization, Argon, Chemical species, Ionization, Infrared lasers, Argon ion lasers, Genetic algorithms, Laser energy

Proceedings Article | 21 September 2005 Paper
Proceedings Volume 5920, 59200B (2005) https://doi.org/10.1117/12.622520
KEYWORDS: X-rays, Streak cameras, Picosecond phenomena, Synchrotron radiation, Ultrafast phenomena, Transistors, Microchannel plates, Ultrafast measurement systems, Electrons, CCD cameras

Proceedings Article | 10 November 2004 Paper
Proceedings Volume 5534, (2004) https://doi.org/10.1117/12.560526
KEYWORDS: Streak cameras, Cameras, Switches, X-rays, Temporal resolution, Neodymium, Picosecond phenomena, Electron beams, Gallium arsenide, Laser energy

Proceedings Article | 28 January 2004 Paper
Proceedings Volume 5194, (2004) https://doi.org/10.1117/12.503372
KEYWORDS: Switches, Streak cameras, Laser energy, X-rays, Laser stabilization, Electrons, Temporal resolution, Pulsed laser operation, Femtosecond phenomena, Gallium arsenide

Proceedings Article | 25 January 2001 Paper
Justin Wark, A. Allen, P. Ansbro, Philip Bucksbaum, Zenghu Chang, Mark DeCamp, Roger Falcone, Philip Heimann, S. Johnson, Inuk Kang, Henry Kapteyn, Jorgen Larsson, Richard Lee, Aaron Lindenberg, Roberto Merlin, Thomas Missalla, G. Naylor, Howard Padmore, David Reis, K. Scheidt, Anders Sjoegren, P. Sondhauss, Michael Wulff
Proceedings Volume 4143, (2001) https://doi.org/10.1117/12.413690
KEYWORDS: Phonons, Crystals, X-rays, X-ray diffraction, Diffraction, Acoustics, Femtosecond phenomena, X-ray optics, Free electron lasers, Reflectivity

Proceedings Article | 22 June 1999 Paper
Xun Hou, Li Du, Wenhui Fan, LiHong Niu, XiaoQiu Zhang, Zenghu Chang, Maixia Gong, Wei Zhao, Binzhou Yang
Proceedings Volume 3516, (1999) https://doi.org/10.1117/12.350485
KEYWORDS: Infrared radiation, Calcium, Infrared cameras, Streak cameras, Picosecond phenomena, Samarium, Visible radiation, Pulsed laser operation, Near infrared, Infrared materials

Proceedings Article | 28 May 1997 Paper
Zenghu Chang, Andy Rundquist, H. Wang, Margaret Murnane, Henry Kapteyn, Xiouqin Liu, Bing Shan, Jiading Liu, LiHong Niu, Maixia Gong, XiaoQiu Zhang, Richard Lee
Proceedings Volume 2869, (1997) https://doi.org/10.1117/12.273398
KEYWORDS: Streak cameras, X-rays, Cameras, Picosecond phenomena, X-ray detectors, Spatial resolution, Temporal resolution, Ultraviolet radiation, X-ray sources, Femtosecond phenomena

Proceedings Article | 28 May 1997 Paper
Aurelia Secroun, Alain Mens, Jacques Segre, Franck Assous, Emmanuel Piault, Jean-Claude Rebuffie, Wenhua Zhu, Yongming Luo, Jinxiu Cheng, Cunbang Yang, Tianshu Wen, Daoyuan Tang, Shu Huai Wen, Zhijian Zheng
Proceedings Volume 2869, (1997) https://doi.org/10.1117/12.273452
KEYWORDS: Cameras, Microchannel plates, Imaging systems, Plasma, Time metrology, Diodes, Picosecond phenomena, Spatial resolution, Modulation, X-rays

Proceedings Article | 30 September 1996 Paper
Hongru Yang, Xiuli Yan, Zenghu Chang
Proceedings Volume 2889, (1996) https://doi.org/10.1117/12.253282
KEYWORDS: Semiconductor lasers, Mode locking, Diodes, Transient nonlinear optics, Dispersion, Laser applications, Precision optics, Precision mechanics, Absorption, Antireflective coatings

Proceedings Article | 1 September 1995 Paper
Zenghu Chang, Bing Shan, Xiouqin Liu, Jinyuan Liu, Wenhua Zhu, Hongru Yang, Y. Ren, Maixia Gong
Proceedings Volume 2549, (1995) https://doi.org/10.1117/12.218320
KEYWORDS: Microchannel plates, Cameras, Picosecond phenomena, Computer simulations, Time metrology, Imaging systems, X-rays, Signal to noise ratio, Spatial resolution, Pulsed laser operation

Proceedings Article | 30 May 1995 Paper
Zenghu Chang, Bing Shan, Xiouqin Liu, Hongru Yang, Wenhua Zhu, Jinyuan Liu, Jidong Hou, Maixia Gong
Proceedings Volume 2513, (1995) https://doi.org/10.1117/12.209588
KEYWORDS: Microchannel plates, Picosecond phenomena, Cameras, Monte Carlo methods, Imaging systems, X-rays, Plasma, Spatial resolution, Photography, Time metrology

Proceedings Article | 30 May 1995 Paper
Proceedings Volume 2513, (1995) https://doi.org/10.1117/12.209590
KEYWORDS: Microchannel plates, Picosecond phenomena, Signal to noise ratio, Cameras, Photography, X-rays, Hard x-rays, Computer simulations, Superposition, Spatial resolution

Showing 5 of 21 publications
Proceedings Volume Editor (3)

SPIE Conference Volume | 13 September 2007

SPIE Conference Volume | 18 August 2005

SPIE Conference Volume | 28 January 2004

Conference Committee Involvement (4)
Ultrafast X-Ray Sources and Detectors
26 August 2007 | San Diego, California, United States
High-Speed Photography and Photonics
4 August 2005 | San Diego, California, United States
Ultrafast X-Ray Detectors and Applications II
31 July 2005 | San Diego, California, United States
Ultrafast X-Ray Detectors and Applications
6 August 2003 | San Diego, California, United States
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