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High-power top-hat pulses from a Yb master oscillator power amplifier for efficient optical parametric amplifier pumping

机译:来自Yb主振荡器功率放大器的高功率礼帽脉冲,用于高效的光参量放大器泵浦

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摘要

We demonstrate shaping of high-energy broadband Yb amplifier pulses for the generation of a (sub)picosecond top-hat temporal pulse profile that significantly improves pumping efficiency of an optical parametric amplifier (OPA). Phase-only modulation is applied by an acousto-optic programmable dispersion filter. This simple scheme is scalable to a high average power due to a relatively broad bandwidth of the Yb:CaF_(2) gain medium used in the amplifier that supports a sub-150-fs transform-limited pulse duration. Additionally we show that OPA seeding with super-continuum remains possible because top-hat-shaped pulses passed through a glass block recompress to approx=200 fs with minimum satellite production.
机译:我们演示了高能宽带Yb放大器脉冲的整形,以产生(亚)皮秒高顶瞬时脉冲轮廓,从而显着提高了光参量放大器(OPA)的泵浦效率。仅相位调制通过声光可编程色散滤波器进行。由于用于支持150-fs以下变换限制脉冲持续时间的放大器中使用的Yb:CaF_(2)增益介质的带宽相对较宽,因此该简单方案可扩展到较高的平均功率。此外,我们显示出具有超连续谱的OPA播种仍然可行,因为通过玻璃块的高顶帽形脉冲将重新压缩到大约200 fs,同时产生的卫星最少。

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