Chang Chun-Lin, Krogen Peter, Hong Kyung-Han, Zapata Luis E, Moses Jeffrey, Calendron Anne-Laure, Liang Houkun, Lai Chien-Jen, Stein Gregory J, Keathley Phillip D, Laurent Guillaume, Kärtner Franz X
Opt Express. 2015 Apr 20;23(8):10132-44. doi: 10.1364/OE.23.010132.
We report on a diode-pumped, hybrid Yb-doped chirped-pulse amplification (CPA) laser system with a compact pulse stretcher and compressor, consisting of Yb-doped fiber preamplifiers, a room-temperature Yb:KYW regenerative amplifier (RGA), and cryogenic Yb:YAG multi-pass amplifiers. The RGA provides a relatively broad amplification bandwidth and thereby a long pulse duration to mitigate B-integral in the CPA chain. The ~1030-nm laser pulses are amplified up to 70 mJ at 1-kHz repetition rate, currently limited by available optics apertures, and then compressed to ~6 ps with high efficiency. The near-diffraction-limited beam focusing quality is demonstrated with M(x)(2) = 1.1 and M(y)(2) = 1.2. The shot-to-shot energy fluctuation is as low as ~1% (rms), and the long-term energy drift and beam pointing stability for over 8 hours measurement are ~3.5% and <6 μrad (rms), respectively. To the best of our knowledge, this hybrid laser system produces the most energetic picosecond pulses at kHz repetition rates among rod-type laser amplifiers. With an optically synchronized Ti:sapphire seed laser, it provides a versatile platform optimized for pumping optical parametric chirped-pulse amplification systems as well as driving inverse Compton scattered X-rays.
我们报道了一种二极管泵浦的混合掺镱啁啾脉冲放大（CPA）激光系统，其具有紧凑的脉冲展宽器和压缩器，由掺镱光纤前置放大器、室温Yb:KYW再生放大器（RGA）和低温Yb:YAG多程放大器组成。RGA提供相对较宽的放大带宽，从而具有较长的脉冲持续时间，以减轻CPA链中的B积分。1030nm的激光脉冲在1kHz重复频率下被放大至70mJ，目前受可用光学孔径限制，然后被高效压缩至6ps。通过M(x)(2)=1.1和M(y)(2)=1.2证明了近衍射极限光束聚焦质量。逐脉冲能量波动低至1%（均方根值），在超过8小时的测量中，长期能量漂移和光束指向稳定性分别为3.5%和<6μrad（均方根值）。据我们所知，在棒状激光放大器中，这种混合激光系统在kHz重复频率下产生能量最高的皮秒脉冲。通过光学同步的钛宝石种子激光器，它提供了一个通用平台，针对泵浦光学参量啁啾脉冲放大系统以及驱动逆康普顿散射X射线进行了优化。
