Two-photon absorption study of GaN

Chi Kuang Sun*, Jian Chin Liang, Jiun Cheng Wang, Fu Jen Kao, Stacia Keller, Michael P. Mack, Umesh Mishra, Steven P. DenBaars

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

112 Scopus citations


Two-photon absorption coefficients of GaN for below band gap ultraviolet wavelength and midgap infrared wavelength were measured by using femtosecond pulsewidth autocorrelation and Z-scan techniques. Large two-photon absorption coefficients were obtained. Taking advantage of the large two-photon absorption, we have demonstrated two-photon confocal imaging of a GaN thin film. Direct correlation was found between the yellow luminescence and suppression of bandedge luminescence.

Original languageEnglish
Pages (from-to)439-441
Number of pages3
JournalApplied Physics Letters
Issue number4
StatePublished - 24 Jan 2000


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