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PARAMETRIC TECHNIQUES FOR EXTREME-CONTRAST, HIGH-ENERGY PETAWATT PULSES

机译:极高对比度PETAWATT脉冲的参数化技术

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Prepulses are of great concern in high-power lasers: if their intensity is sufficiently high, they can heat and/or destroy a target before the arrival of the main pulse. For ultrahigh peak power lasers, for which focused intensity can exceed 10~(21) W/cm~2, a contrast of at least 10~8 is the minimum requirement to avoid preionization of solid targets. Conventional preamplification stages do not meet this requirement, primarily due to prepulse originating from regenerative amplification. Optical parametric amplification (OPA) is well-known to generate pulses with a prepulse contrast equal to the gain of the amplifier, but it does not remove pre-existing prepulses. In this paper we describe a novel technique for contrast enhancement in cascaded optical parametric amplifiers (COPA). Based on cascaded idler utilization, COPA represents a versatile technique with a potentially infinite prepulse contrast enhancement. We have experimentally demonstrated COPA, producing a prepulse contrast of 10~8, limited by the sensitivity of measurement. A simple modification of the front end of a petawatt-type laser that utilizes optical parametric chirped pulse amplification (OPCPA) can yield unprecedented levels of prepulse contrast.
机译:预脉冲在高功率激光器中非常重要:如果其强度足够高,它们可以在主脉冲到达之前加热和/或破坏目标。对于聚焦强度可以超过10〜(21)W / cm〜2的超高峰值功率激光器,至少要有10〜8的对比度才能避免固体目标被电离。常规的前置放大阶段不满足该要求,主要是由于再生放大产生的预脉冲。众所周知,光参量放大(OPA)会产生预脉冲对比度等于放大器增益的脉冲,但它不会消除预先存在的预脉冲。在本文中,我们描述了一种用于级联光参量放大器(COPA)中对比度增强的新技术。基于级联的惰轮利用率,COPA代表了一种具有潜在无限的预脉冲对比度增强功能的通用技术。我们已经通过实验证明了COPA,产生的预脉冲对比度为10〜8,受测量灵敏度的限制。利用光学参量chi脉冲放大(OPCPA)对petawatt型激光器的前端进行简单修改,可以产生前所未有的预脉冲对比度。

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