Minimization of the impact of a broad bandwidth high-gain nonlinear preamplifier to the amplified spontaneous emission pedestal of the Vulcan petawatt laser facility.
Minimization of the impact of a broad bandwidth high-gain nonlinear preamplifier to the amplified spontaneous emission pedestal of the Vulcan petawatt laser facility.
复制标题
最大限度地减少宽带宽高增益非线性前置放大器对 Vulcan 拍瓦激光设施放大自发发射基座的影响。
作者：
I. Musgrave;C. Hernandez;D. Canny;J. Collier;R. Heathcote
要使用 Vulcan Nd:glass 激光器生成拍瓦脉冲，需要宽带宽高增益前置放大器。所使用的前置放大器是光学参量放大器，在三个放大级中提供 10(8) 的总增益。我们报告了对 Vulcan 光学参量啁啾脉冲放大 (OPCPA) 前置放大器对放大自发发射 (ASE) 基座造成的对比度影响的详细研究，该基座在主脉冲到达之前延伸长达 2 ns。使用 OPCPA 前置放大器级之间的近场孔径，压缩后的对比度可提高至主脉冲强度的 4x10(8)。 ASE 基座水平的进一步降低可以通过在初始预放大之后单独使用磷酸盐玻璃放大而不是混合玻璃放大方案来以减小放大带宽为代价来实现。
To generate petawatt pulses using the Vulcan Nd:glass laser requires a broad bandwidth high-gain preamplifier. The preamplifier used is an optical parametric amplifier that provides a total gain of 10(8) in three amplification stages. We report on a detailed investigation of the effect of the Vulcan optical parametric chirped pulse amplification (OPCPA) preamplifier on contrast caused by the amplified spontaneous emission (ASE) pedestal that extends up to 2 ns before the arrival of the main pulse. The contrast after compression is improved to 4x10(8) of the intensity of the main pulse using near-field apertures between the stages of the OPCPA preamplifier. Further reduction of the level of the ASE pedestal can be achieved at the cost of a reduction in amplified bandwidth by solely phosphate glass amplification after initial preamplification rather than a mixed glass amplification scheme.