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 (20)

Proceedings Article | 16 November 2018 Paper
Proc. SPIE. 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference
KEYWORDS: Femtosecond phenomena, Polarization, Laser induced damage, High power lasers, Crystals, Laser damage threshold, Pulsed laser operation

Proceedings Article | 9 November 2016 Paper
Proc. SPIE. 10016, High-Power Lasers and Applications VIII
KEYWORDS: Diffraction, Optical design, Holography, Lithium, Silica, Etching, Ion beams, Laser damage threshold, Pulsed laser operation, Diffraction gratings

Proceedings Article | 12 May 2015 Paper
Proc. SPIE. 9511, Damage to VUV, EUV, and X-ray Optics V
KEYWORDS: Infrared imaging, Femtosecond phenomena, Silica, Polarization, Ultraviolet radiation, Electrons, Scanning electron microscopy, Ionization, Laser damage threshold, Picosecond phenomena

Proceedings Article | 18 November 2014 Paper
Proc. SPIE. 9266, High-Power Lasers and Applications VII
KEYWORDS: Diffraction, Optical design, Silica, Reflection, High power lasers, Composites, Transmittance, Sapphire lasers, Laser damage threshold, Diffraction gratings

Proceedings Article | 18 November 2014 Paper
Proc. SPIE. 9266, High-Power Lasers and Applications VII
KEYWORDS: Gold, Diffraction, Optical design, Holography, Femtosecond phenomena, Laser development, Photoresist materials, Sapphire lasers, System on a chip, Diffraction gratings

Showing 5 of 20 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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