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Nonlinear Optics and Photonics$
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Guang S. He

Print publication date: 2014

Print ISBN-13: 9780198702764

Published to Oxford Scholarship Online: December 2014

DOI: 10.1093/acprof:oso/9780198702764.001.0001

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Nonlinear Photoelectric Effects

Nonlinear Photoelectric Effects

(p.489) 15 Nonlinear Photoelectric Effects
Nonlinear Optics and Photonics

Guang S. He

Oxford University Press

Since the advent of the laser technology, it has been found that conventional (linear) photoelectric effects (photoemission and photoconductivity) can be observed by using laser radiation with wavelengths much longer than the cut-off wavelength for a given material. The measured photoemitted electron numbers or the induced photoconductive responses manifest a nonlinear relation with the input laser intensity. These new observations can be interpreted well based on multi-photon excitation mechanisms, and thereby termed multi-photon (or nonlinear) photoelectric effects. The multi-photon photoemission technique is an effective new approach to investigate the image-potential state structure and dynamic behavior of pure or adsorbed metal surfaces. The multi-photon conductivity technique can be utilized to investigate the spectral structure of exciton states or Landau level splitting of semiconductor samples. In addition, the multi-photon excited semiconductor photodiode can be used as an optical correlator to measure the ultrashort laser pulse width without the phase-matching requirement.

Keywords:   Multi-photon photoemission, multi-photon photoconductivity, image-potential state, excitonic state, nonlinear photoelectric effect, semiconductor photodiode, ultrashort laser pulse

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