NDLI: Third harmonic generation microscopy of GaN

Content Provider	IEEE Xplore Digital Library
Author	Chi-Kuang Sun Shi-Wei Chu Keller, S. DenBaars, S.P.
Copyright Year	2000
Description	Author affiliation: Inst. of Electro-Opt. Eng., Nat. Taiwan Univ., Taipei, Taiwan (Chi-Kuang Sun; Shi-Wei Chu; Keller, S.; DenBaars, S.P.)
Abstract	During SHG experiments of GaN using a femtosecond Cr:forsterite laser, we also observed strong third harmonic generation (THG) in the bulk GaN. Since THG exists in centrosymmetric structures it can be an excellent label for the mapping of the crystal property itself, in contrast to SHG as the label for the strength of piezoelectric field. With 40 mW 100 fs Cr:forsterite laser input, we can easily obtain THG at purple wavelength on the order of 10 nW with an 80/spl times/ objective. The input and output spectra of THG in a 2 /spl mu/m-thick bulk GaN are shown. With input wavelength centered at 1230 nm, we observed the THG spectrum centered at 410 nm. The room temperature bandgap of GaN is located around 365 nm. The THG microscopy can then by accomplished by scanning the GaN sample using a computer controlled XYZ stage. By comparing the THG microscopy with SHG microscopy, detailed information on the crystal properties can then be obtained. In this presentation we compare the THG microscopy with the SHG microscopy as well as two-photon and three-photon confocal microscopy. By comparing these images obtained through different nonlinear optical microscopy, we can obtain complete and interesting information not observed before.
File Size	107248
File Format	PDF
ISBN	0780363183
DOI	10.1109/IQEC.2000.907762
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-10
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency conversion Microscopy Gallium nitride Optical harmonic generation Fractals Laser modes Laser theory Optical computing Nonlinear optics Quantum computing
Content Type	Text
Resource Type	Article

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