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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 14 — Jul. 11, 2005
  • pp: 5245–5252

Non-degenerate fs pump-probe study on InGaN with multi-wavelength second-harmonic generation

Hsiang-Chen Wang, Yen-Cheng Lu, Cheng-Yen Chen, Chun-Yung Chi, Shu-Cheng Chin, and C. C. Yang  »View Author Affiliations

Optics Express, Vol. 13, Issue 14, pp. 5245-5252 (2005)

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Non-degenerate fs pump-probe experiments in the UV-visible range for ultrafast carrier dynamics study of InGaN with adjustable pump and probe photon energies are implemented with simultaneously multi-wavelength second-harmonic generation (SHG) of a 10 fs Ti:sapphire laser. The multi-wavelength SHG is realized with two β-barium borate crystals of different cutting angles. The full-widths at half-maximum of the SHG pulses are around 150 fs, which are obtained from the cross-correlation measurement with a reverse-biased 280-nm light-emitting diode as the two-photon absorption photo-detector. Such pulses are used to perform non-degenerate pump-probe experiments on an InGaN thin film, in which indium-rich nano-clusters and compositional fluctuations have been identified. Relaxation of carriers from the pump level to the probe one through the scattering-induced local thermalization (<1 ps) and then the carrier-transport-dominating global thermalization (in several ps) processes is observed.

© 2005 Optical Society of America

OCIS Codes
(160.6000) Materials : Semiconductor materials
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Research Papers

Original Manuscript: April 14, 2005
Revised Manuscript: June 2, 2005
Published: July 11, 2005

Hsiang-Chen Wang, Yen-Cheng Lu, Cheng-Yen Chen, Chun-Yung Chi, Shu-Cheng Chin, and C. C. Yang, "Non-degenerate fs pump-probe study on InGaN with multi-wavelength second-harmonic generation," Opt. Express 13, 5245-5252 (2005)

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