Evidence for third-harmonic generation in disguise of second-harmonic generation in extreme nonlinear optics.
Evidence for third-harmonic generation in disguise of second-harmonic generation in extreme nonlinear optics.
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DOI：
10.1103/physrevlett.90.217404
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发表时间：
2003-05
影响因子：
8.6
通讯作者：
T. Tritschler;O. Mücke;M. Wegener;U. Morgner;F. Kärtner
中科院分区：
文献类型：
--
作者：
T. Tritschler;O. Mücke;M. Wegener;U. Morgner;F. Kärtner
与传统的非线性光学不同，在极端非线性光学条件下，在反转对称介质中也可以在激光二次谐波的光谱位置产生峰值。我们描述了这种以二次谐波为掩饰的三次谐波产生的潜在机制，并将理论与最近在薄膜上测量的光学和射频光谱进行了比较。无线电频谱中载波包络偏移频率的两倍处的峰值被证明是这一过程的明确特征。
In contrast with traditional nonlinear optics, a peak at the spectral position of the second harmonic of a laser can also be generated in an inversion-symmetric medium in the regime of extreme nonlinear optics. We describe the underlying mechanism of such third-harmonic generation in disguise of second-harmonic generation and compare theory with the optical as well as the radio-frequency spectra measured in recent experiments on thin ZnO films. The peak at twice the carrier-envelope offset frequency in the radio-frequency spectra is shown to be an unambiguous signature of such a process.