Dorrer C, Hill E M, Zuegel J D
Opt Express. 2020 Jan 6;28(1):451-471. doi: 10.1364/OE.28.000451.
We study and demonstrate the efficient parametric amplification of spectrally incoherent broadband nanosecond pulses to high energies. Signals composed of mutually incoherent monochromatic lines or amplified spontaneous emission are amplified in a sequence of optical parametric amplifiers pumped at 526.5 nm, with the last amplifier set in a collinear geometry. This configuration results in 70% conversion efficiency from the pump to the combined signal and idler, with a combined energy reaching 400 mJ and an optical spectrum extending over 60 nm around 1053 nm. The spatial, spectral, and temporal properties of the amplified waves are investigated. The demonstrated high conversion efficiency, spectral incoherence, and large bandwidth open the way to a new generation of high-energy, solid-state laser drivers that mitigate laser-plasma instabilities and laser-beam imprint via enhanced spectral bandwidth.
我们研究并展示了将光谱非相干宽带纳秒脉冲高效参量放大至高能的过程。由相互非相干的单色线或放大自发辐射组成的信号，在一系列由526.5 nm泵浦的光学参量放大器中被放大，最后一个放大器设置为共线几何结构。这种配置实现了从泵浦到组合信号和闲频光70%的转换效率，组合能量达到400 mJ，光谱在1053 nm附近扩展超过60 nm。研究了放大波的空间、光谱和时间特性。所展示的高转换效率、光谱非相干性和大带宽为新一代高能固态激光驱动器开辟了道路，这类驱动器可通过增强光谱带宽来减轻激光等离子体不稳定性和激光束印记。
