Pugzlys A, Andriukaitis G, Baltuska A, Su L, Xu J, Li H, Li R, Lai W J, Phua P B, Marcinkevicius A, Fermann M E, Giniūnas L, Danielius R, Alisauskas S
Photonics Institute, Vienna University of Technology, Vienna, Austria.
Opt Lett. 2009 Jul 1;34(13):2075-7. doi: 10.1364/ol.34.002075.
Using a novel (to our knowledge) broadband Yb-doped Yb3+,Na+:CaF2 crystal cooled in a closed loop to 130 K we demonstrate a chirped pulse regenerative laser amplifier delivering the energy of up to 3 mJ at a repetition rate of 1 kHz and an average output power of 6 W at 20 kHz. The gain narrowing in the laser crystal is compensated by shaping the amplitude of the seed pulse spectrum. As the result, at the highest amplified pulse energy we obtain a 12 nm FWHM bandwidth supporting a 130 fs pulse duration, assuming ideal compression. Amplified pulses were recompressed from 250 ps to 195 fs with a 1700 lines/mm transmission grating compressor.
我们使用一种新型的（据我们所知）掺镱的Yb³⁺，Na⁺：CaF₂晶体，该晶体在闭环中冷却至130K，展示了一种啁啾脉冲再生激光放大器，其在1kHz的重复频率下可提供高达3mJ的能量，在20kHz时平均输出功率为6W。通过对种子脉冲光谱的幅度进行整形来补偿激光晶体中的增益窄化。结果，在最高放大脉冲能量下，假设理想压缩，我们获得了12nm的半高宽带宽，支持130fs的脉冲持续时间。放大后的脉冲通过一个1700线/毫米的透射光栅压缩器从250ps重新压缩至195fs。
