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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 24 — Nov. 24, 2008
  • pp: 19900–19908

Near-resonant high order nonlinear absorption of ZnO thin films

Yun-Pei Chan, Ja-Hon Lin, Chih-Chang Hsu, and Wen-Feng Hsieh  »View Author Affiliations

Optics Express, Vol. 16, Issue 24, pp. 19900-19908 (2008)

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Nonlinear optical absorption of ZnO thin film grown by the laser molecular beam epitaxy was investigated by the Z-scan method using a frequency-doubled femtosecond Ti:sapphire laser. Due to near-exciton resonance, an enormous enhancement of two photon absorption (TPA) is about 3000 cm/GW at 390 nm which is about 6.5 times larger than the previously reported at two-photon exciton resonance in near-IR regime and 710 times larger than that of ZnO bulk measured at 532 nm. Besides, the free-carrier absorption resulting from linear absorption and TPA becomes essential when the excitation approaches the exciton resonance.

© 2008 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(160.6000) Materials : Semiconductor materials
(190.0190) Nonlinear optics : Nonlinear optics
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:
Nonlinear Optics

Original Manuscript: September 24, 2008
Revised Manuscript: November 7, 2008
Manuscript Accepted: November 7, 2008
Published: November 18, 2008

Yun-Pei Chan, Ja-Hon Lin, Chih-Chang Hsu, and Wen-Feng Hsieh, "Near-resonant high order nonlinear absorption of ZnO thin films," Opt. Express 16, 19900-19908 (2008)

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