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Surface-emitting second harmonic generation from short laser pulses

机译：短激光脉冲产生表面发射的二次谐波

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Abstract: We review our recent results on ultrafast surface-emitting second-harmonic generation from mode-locked laser pulses with arbitrary pulse shapes. The spatial dependence of the SH energy density per pulse is almost the same as the temporal profile of the SH power emitted from the entire surface per waveguide width for a long waveguide. For a sinc fundamental pulse, we have obtained, rich and unique, temporal, spatial, and spectral behavior of the second harmonic. We have found that both the temporal and spectral profiles of the emitted second harmonic depend on the location at the surface. These effects can be observed with lasers currently available, and used for auto-correlation, in optical signal processing, optical communications, and practical frequency doubling of ultrafast optical pulses with an advantage of no broadening of the SH pulse. We have compared these results with those for Gaussian, Lorentzian, and hyperbolic secant fundamental pulses. After introducing saturation intensity to quantify the saturation regime, we have obtained quantitative expression for the second-harmonic intensity in terms of the pump and saturation intensities. !19
机译：摘要：我们回顾了最近的结果，该结果来自具有任意脉冲形状的锁模激光脉冲产生的超快表面发射二次谐波的结果。每个脉冲的SH能量密度的空间依赖性几乎与长波导的每个波导宽度从整个表面发射的SH功率的时间分布相同。对于正弦基波脉冲，我们已经获得了丰富而独特的二次谐波的时间，空间和频谱特性。我们已经发现，所发射的二次谐波的时间和频谱轮廓都取决于表面上的位置。这些影响可以用当前可用的激光器观察到，并用于光信号处理，光通信中的自相关，以及超快光脉冲的实际倍频，其优点是不会扩大SH脉冲。我们将这些结果与高斯，洛伦兹和双曲正割基本脉冲的结果进行了比较。在引入饱和强度以量化饱和状态之后，我们获得了基于泵浦和饱和强度的二次谐波强度的定量表达式。 ！19

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