Separated-beam nonphase-matched second- harmonic method of characterizing nonlinear optical crystals
Separated-beam nonphase-matched second- harmonic method of characterizing nonlinear optical crystals
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DOI：
10.1364/josab.15.002298
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发表时间：
1998-08
影响因子：
1.9
通讯作者：
R. J. Gehr;Arlee V. Smith
中科院分区：
文献类型：
--
作者：
R. J. Gehr;Arlee V. Smith
我们证明了一种变化的楔形方法的Maker条纹测量中的基本光束直径是足够大，以包含几个二次谐波相干条纹。在远场中，二次谐波形成空间分离的光束，从该光束可以在单个激光脉冲上推导出Δk和deff。分析是简单的，因为没有条纹分析是必需的，因为该方法是免疫多重表面反射，双折射走离，群速度走离，和表面效应，如纵向偏振。给出了KDP和LiIO3的测量实例。
We demonstrate a variation of the wedge method of Maker-fringe measurement in which the fundamental beam diameter is large enough to contain several second-harmonic coherence fringes. In the far field the second harmonic forms spatially separated beams from which both Δk’s and deff’s can be deduced on a single laser pulse. Analysis is simple because no fringe analysis is required and because the method is immune to multiple surface reflections, birefringent walk-off, group-velocity walk-off, and surface effects such as longitudinal polarization. Example measurements on KDP and LiIO3 are presented.