Simultaneous generation of sum, difference, and harmonics of two laser frequencies by spread spectrum phase matching
Simultaneous generation of sum, difference, and harmonics of two laser frequencies by spread spectrum phase matching
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通过扩频相位匹配同时生成两个激光频率的和、差和谐波
DOI：
10.1109/cleoe.1994.635813
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
B. Fischer
中科院分区：
文献类型：
--
作者：
M. Horowitz;A. Bekker;B. Fischer
非线性参量过程，现在似乎是最有前途的手段，提供激光光束具有非常大的调谐范围，具有一个关键的限制因素，由于相位匹配的要求。当相互作用长度被限制在非常“薄”的晶体时，违反这一要求是可能的。解决这一问题的常用方法是利用晶体的双折射。这允许通过改变晶体中光束传播的角度来实现有限程度的波长可调谐性。另一种解决方案是通过光学非线性的“人工”空间调制来实现准相位匹配，或者折射率也将相位匹配限制到特定的输入波长。在最近的工作中，我们已经证明了一种新的方法，宽带二次谐波产生（SHG）的可控扩频准相位匹配。畴栅周期的宽频谱提供了宽带能力。我们还演示了通过定制的准相位匹配对预先指定的离散或连续光束波长产生二次谐波。
Nonlinear parametric processes, that now seem to be the most promising means for providing laser light beams with very large tuning ranges, have a critical limiting factor due to the phase matching requirement. Violation of this requirement is possible when the interaction length is limited to very "thin" crystals. The common method to solve this problem is by using the crystal birefringence. This allows a limited degree of wavelength tunability by changing the angle of the beam propagation in the crystal. Another solution is quasi-phasematching by "artificial" spatial modulation of the optical nonlinearity, or the refractive index also restricts the phase matching to a specific input wavelength. In recent works1 we have demonstrated a new method for broadband second harmonic generation (SHG) by controllable spread spectrum quasi-phase matching. The broad spectrum of the domain grating period provided the broadband capability. We have also demonstrated second harmonic generation for prespecified discrete or continuous beam wavelengths by tailored quasi-phase matching.2