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首页> 外文会议>Optical Systems Design 2015: Advances in optical thin films V >Polishing and coating of a F1250mm 90° off-axis parabola for PW lasers
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Polishing and coating of a F1250mm 90° off-axis parabola for PW lasers

机译：用于PW激光器的F1250mm 90°离轴抛物线的抛光和涂层

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The peak power handling capability of ultra-short pulse lasers is main concern for new facilities, like those for the French Apollon 10P, and European Extreme Light Infrastructure (ELI) projects. Indeed, these last generation lasers require complex, large (O1m) and resistant optical components with optimized thin-film coatings. Using on one hand the recent development of high laser resistant broadband high reflective coatings through a joint project with the Laboratoire d'Optique Appliquee and Fresnel Institute, and on the other hand its long time experience with polishing and measuring large and complex optical components, Reosc decided to demonstrate the feasibility of a O500mm aperture, 90° deviation, F/2.5 high output NA Off-Axis Parabola (OAP) dedicated to focus fs ultra-intense laser beams. The prototype of the 90° OAP has a concave surface with 20mm of aspherisation for focal length of F1250mm. The OAP is coated with a hybrid Metal/Multi-Layer-Dielectric coating. It provides a reflectivity up to 98%, an absolute Group Delay Dispersion (GDD) below 100fs~2 and a Laser-Induced Damage Threshold (LIDT) up to 0.5J/cm~2, at 15fs and under vacuum. These performances are achieved on the whole surface and on the 200nm spectral range required by the sub 20fs PW-systems. In this paper, Reosc report the developments required for the polishing, the coating and the measurements of the OAP and we will show the performances achieved on the prototype.
机译：超短脉冲激光器的峰值功率处理能力是新设施的主要关注点，例如法国Apollon 10P和欧洲极光基础设施（ELI）项目。的确，这些最新一代的激光器需要具有优化的薄膜涂层的复杂，大型（O1m）且具有抵抗力的光学组件。一方面通过与Optato贴花实验室和菲涅尔研究所的联合项目，利用高耐激光宽带高反射涂层的最新开发成果，另一方面利用Reosc在抛光和测量大型和复杂光学组件方面的长期经验决定展示O500mm孔径，90°偏差，F / 2.5高输出NA离轴抛物线（OAP）的可行性，该聚焦专用于聚焦超超强激光束。 90°OAP的原型具有一个凹面，具有20mm的非球面度，焦距为F1250mm。 OAP涂有金属/多层电介质混合涂层。它在15fs和真空下提供高达98％的反射率，低于100fs〜2的绝对群延迟色散（GDD）和高达0.5J / cm〜2的激光诱导损伤阈值（LIDT）。这些性能是在20fs以下PW系统所需的整个表面和200nm光谱范围内实现的。 Reosc在本文中报告了OAP的抛光，涂层和测量所需的发展，我们将展示在原型上实现的性能。

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