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在升级5TW/40fs钛宝石激光系统的过程中,伴随10fs种子源的使用,提出并研制了一种新型的共心衍射无像差展宽器和全能量压缩器。该展宽器的最大特点是通过平面镜反射使光束入射时所形成的衍射点与展宽后的还原点均在凹面镜的球心(即共心结构),凹面镜不存在其它同类方法中的成像问题,展宽函数中不涉及凹面镜的焦距和离轴量。该展宽器可将亚10fs的种子脉冲展宽到纳秒量级,且具有无像差、高带宽、结构紧凑、调整精度高等优点,适合100TW级超快激光系统中脉冲展宽。
In the process of upgrading the 5TW / 40fs Ti: sapphire laser system, a new type of concentric diffractive aberration-free stretcher and all-energy compressor was proposed and developed with the use of 10fs seed source. The most prominent feature of this stretcher is that the diffraction spots formed when the light beam is incident through the plane mirror reflection and the broadened reduction point are at the center of the spherical surface of the concave mirror (ie, the concentric structure), and the concave mirror does not have the imaging problem in other similar methods , The broadening function does not involve the focal length and off-axis amount of concave mirror. The stretcher can broaden the sub-10fs seed pulse to the order of nanoseconds, and has the advantages of no aberration, high bandwidth, compact structure and high adjustment precision, and is suitable for pulse broadening in a 100TW ultrafast laser system.