Spectral Energies, LLC, 5100 Springfield Street, Dayton, Ohio 45431, USA.
Opt Lett. 2012 Aug 1;37(15):3051-3. doi: 10.1364/OL.37.003051.
We discuss photolytic-interference-free, high-repetition-rate imaging of reaction intermediates in flames and plasmas using femtosecond (fs) multiphoton excitation. The high peak power of fs pulses enables efficient nonlinear excitation, while the low energy nearly eliminates interfering single-photon photodissociation processes. We demonstrate proof-of-principle, interference-free, two-photon laser-induced fluorescence line imaging of atomic hydrogen in hydrocarbon flames and discuss the method's implications for certain other atomic and molecular species.
我们讨论了使用飞秒（fs）多光子激发技术在火焰和等离子体中无光解干扰、高重复率成像反应中间体的方法。fs 脉冲的高峰值功率能够实现高效的非线性激发，而低能量几乎消除了干扰的单光子光解过程。我们演示了在碳氢化合物火焰中原子氢的无干扰双光子激光诱导荧光线成像的原理验证，并讨论了该方法对某些其他原子和分子物种的意义。
