Hertz E, Billard F, Karras G, Béjot P, Lavorel B, Faucher O
Opt Express. 2016 Nov 28;24(24):27702-27714. doi: 10.1364/OE.24.027702.
We present a method to finely tailor ultraviolet femtosecond laser pulses using a pulse shaper with ability in the infrared/visible spectral range. We have developed to that end a frequency doubling module in which the up-conversion mechanism is carried out in the Fourier plane of a 4 f -line. The pulse shaper is used to imprint a spectral phase and/or amplitude onto the fundamental pulse. The shaped pulse is then frequency doubled through the module which transfers the applied spectral shaping to the second harmonic field in a predictable manner. The relevance of the method is demonstrated by synthesizing and characterizing shaped pulses at a central wavelength of 400 nm. The results demonstrate a full control over the spectral phase and amplitude of the harmonic field. The experimental setup is simple and features interesting prospects for the polarization shaping of ultraviolet pulses and the production of shaped ultraviolet pulses requested for the seeding of free-electron lasers.
我们提出了一种使用具有红外/可见光谱范围能力的脉冲整形器来精细调整紫外飞秒激光脉冲的方法。为此，我们开发了一种倍频模块，其中上转换机制在4f线的傅里叶平面中进行。脉冲整形器用于在基频脉冲上施加光谱相位和/或幅度。然后，通过该模块对整形后的脉冲进行倍频，该模块以可预测的方式将施加的光谱整形传递到二次谐波场。通过合成和表征中心波长为400nm的整形脉冲，证明了该方法的相关性。结果表明可以完全控制谐波场的光谱相位和幅度。该实验装置简单，在紫外脉冲的偏振整形以及产生用于自由电子激光种子源所需的整形紫外脉冲方面具有有趣的前景。
