| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1539349 | Optics Communications | 2009 | 6 Pages |
Abstract
The fluorescence emission from indole resulting from two-color two-photon (2C2P) excitation with 400 and 800Â nm wavelengths is observed, using the second harmonic and fundamental wavelength of a 800Â nm 40Â fs pulsed Ti:Sapphire femtosecond (fs) regenerative amplifier operating at a repetition rate of 1Â kHz. By delaying one fs laser pulse relative to the other, the cross correlation of fluorescence is observed, which indicates the generation of 2C2P fluorescence signal in the experiment. The strongest 2C2P fluorescence emission characterized by the peak of cross correlation curve suggests optimal temporal overlap of the two fs laser pulses. The 2C2P fluorescence signal is linearly dependent on the total excitation intensity. The fluorescence signals with 400Â nm and 800Â nm irradiation alone are also demonstrated and discussed in this paper.
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Authors
Lingling Qiao, Jielei Ni, Zhengle Mao, Chen Wang, Ya Cheng,