Prof. Zenghu Chang
Professor at Univ of Central Florida
SPIE Involvement:
Area of Expertise:
Attosecond science , high harmonic generation , Strong field physics , Ultrafast intense lasers , mid-infrared lasers , Atomic, molecular and optical physics
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)
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)
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)
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)
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)
KEYWORDS: Diffraction gratings, Diffraction, Composites, Silica, Laser damage threshold, Transmittance, Optical design, Sapphire lasers, High power lasers, Reflection

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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