Two-photon excitation of 2,5-diphenyloxazole using a low power green solid state laser.
Two-photon excitation of 2,5-diphenyloxazole using a low power green solid state laser.
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DOI:
10.1016/j.cplett.2010.11.038
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发表时间:
2011-01-07
影响因子:
2.8
通讯作者:
Luchowski, Rafal
中科院分区:
文献类型:
--
作者:
Luchowski, Rafal
This Letter concerns two-photon excitation of 2,5-Diphenyloxazole (PPO) upon illumination from a pulsed 532 nm solid state laser, with an average power of 30 mW, and a repetition rate of 20 MHz. A very agreeable emission spectrum position and shape has been achieved for PPO receiving one- and two-photon excitation, which suggests that the same excited state is involved for both excitation modes. Also, a perfect quadratic dependence of laser power in the emission intensity function has been recorded. We tested the application of a small solid state green laser to two-photon induced time-resolved fluorescence, revealing the emission anisotropy of PPO to be considerably higher for two-photon than for one-photon excitation.
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