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Journal of Applied Physics / Volume 110 / Issue 11 / ARTICLES / Lasers, Optics, and Optoelectronics

J. Appl. Phys. 110, 113112 (2011); http://dx.doi.org/10.1063/1.3665645 (5 pages)

Time-resolved femtosecond optical characterization of multi-photon absorption in high-pressure-grown Al0.86Ga0.14N single crystals

Jie Zhang1, Andrey Belousov2, Janusz Karpiński2, Bertram Batlogg2, Gary Wicks3, and Roman Sobolewski1

1Department of Electrical and Computer Engineering and Laboratory for Laser Energetics, University of Rochester, New York 14627-0231, USA
2Laboratory for Solid State Physics, ETH Zurich, Zurich 8093, Switzerland
3The Institute of Optics, University of Rochester, New York 14627-0186, USA

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(Received 15 February 2011; accepted 31 October 2011; published online 12 December 2011)

We report our experimental studies on time-resolved pump–probe spectroscopy in high-quality Al0.86Ga0.14N single crystals, grown using a solution technique in a high-nitrogen-gas-pressure system. Our optical measurements were performed using a non-traditional, two-beam [one ultraviolet (UV) and one infrared (IR)], femtosecond pump–probe approach, in which the photon energies of both beams were below the bandgap of the sample and each electron–hole pair was generated by a multi-photon process of absorption of a pump photon together with another photon produced by second harmonic generation from two probe photons. Temporal scanning of the probe while monitoring the normalized transient differential transmissivity (ΔT/T) signal, produced a 310-fs-wide, Gaussian-shaped correlation signal caused by the multi-photon absorption process, followed by a >100-ps-long relaxation of photo-excited carriers. By studying the ΔT/T correlation signal amplitude dependence on the pump-power intensity and wavelength, the multi-photon absorption was determined to be predominantly caused by absorption of a pump photon and a second harmonic photon from the probe.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. SAMPLE DESCRIPTION AND EXPERIMENTAL SETUP
  3. RESULTS
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

aluminium compounds, crystal growth from solution, energy gap, gallium compounds, high-pressure effects, high-speed optical techniques, III-V semiconductors, infrared spectra, multiphoton processes, optical harmonic generation, semiconductor growth, time resolved spectra, ultraviolet spectra, wide band gap semiconductors

PACS

  • 78.47.D-

    Time resolved spectroscopy (>1 psec)

  • 42.65.Ky

    Frequency conversion; harmonic generation, including higher-order harmonic generation

  • 72.20.Jv

    Charge carriers: generation, recombination, lifetime, and trapping

  • 78.30.Fs

    III-V and II-VI semiconductors

  • 78.40.Fy

    Semiconductors

  • 81.10.Dn

    Growth from solutions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3665645

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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