The majority of the applications of ultrashort laser pulses require a control of its spectral bandwidth. In this paper we show the capability of volume phase holographic gratings recorded in photopolymerizable glasses for spectral pulse reshaping of ultrashort laser pulses originated in an Amplified Ti: Sapphire laser system and its second harmonic. Gratings with high laser induce damage threshold (LIDT) allowing wide spectral bandwidth operability satisfy these demands. We have performed LIDT testing in the photopolymerizable glass showing that the sample remains unaltered after more than 10 million pulses with 0,75 TW/cm^2 at 1 KHz repetition rate. Furthermore, it has been developed a theoretical model, as an extension of the Kogelnik's theory, providing key gratings design for bandwidth operability. The main features of the diffracted beams are in agreement with the model, showing that non-linear effects are negligible in this material up to the fluence threshold for laser induced damage. The high versatility of the grating design along with the excellent LIDT indicates that this material is a promising candidate for ultrashort laser pulses manipulations.
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机译:超短激光脉冲的大多数应用都需要控制其光谱带宽。在本文中,我们展示了可光聚合玻璃中记录的体积相全息光栅对源自放大的Ti:蓝宝石激光系统及其二次谐波的超短激光脉冲进行光谱脉冲整形的能力。具有高激光感应损伤阈值(LIDT)的光栅允许宽光谱带宽的可操作性满足这些要求。我们已经在可光聚合玻璃中进行了LIDT测试,结果表明,在以1 KHz重复频率进行的0.75 TW / cm ^ 2的超过1000万次脉冲后,样品保持不变。此外,它已经发展了一个理论模型,作为Kogelnik理论的扩展,提供了用于带宽可操作性的关键光栅设计。衍射光束的主要特征与模型相符,表明在这种材料中,直到激光诱导损伤的注量阈值,非线性效应都可以忽略不计。光栅设计的高通用性以及出色的LIDT表明该材料是超短激光脉冲操纵的有希望的候选者。
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