Tata Institute of Fundamental Research, Mumbai, India.
Opt Lett. 2013 Jul 15;38(14):2560-2. doi: 10.1364/OL.38.002560.
We report generation of third, fifth and seventh harmonics from air by using tightly focused, ultrashort pulses of short-wave infrared (2 μm) radiation. We have measured the third- and fifth-harmonic efficiencies to be 5×10(-5) and ~1.4×10(-5), respectively, with the ratio of fifth-to-third-harmonic efficiency being close to 0.28. Our experimental results provide confirmation of expectations of the higher-order Kerr effect model.
我们报告了利用短波长红外（2 μm）辐射的紧聚焦超短脉冲从空气中产生第三、第五和第七谐波。我们已经测量了第三和第五谐波的效率，分别为 5×10(-5)和~1.4×10(-5)，第五与第三谐波效率的比值接近 0.28。我们的实验结果证实了更高阶克尔效应模型的预期。
