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本文利用交叉偏振波产生技术(XPW)对800 nm波段钛宝石飞秒激光器输出的激光脉冲进行时域净化,提高脉冲时域对比度,并测量验证了10~(11)对比度的脉冲,达到测量仪器的动态范围极限,比初始脉冲时域对比度有三个量级的提高,XPW的效率为22%.同时发现净化后脉冲光谱宽度也得到一定展宽,进一步利用啁啾镜对和补偿片对净化后的脉冲进行色散补偿,得到25 fs脉宽的脉冲.利用该净化后的激光脉冲作为种子注入已有的太瓦级钛宝石啁啾脉冲放大系统中,在输出脉冲能量250 mJ,宽度50 fs,对应峰值功率5 TW的情况下,在主脉冲前100 ps以外的范围内测量验证了10~(11)的脉冲对比度.
In this paper, the cross-polarized wave generation technology (XPW) is used to purify the laser pulses output by the 800-nanometer-band Ti: sapphire femtosecond laser in time domain to improve the contrast in the pulse time domain and measure the 10 ~ (11) The dynamic range limit of the initial pulse is improved by three orders of magnitude compared with that of the initial pulse, the efficiency of XPW is 22% .It is also found that the width of the pulsed spectrum after the purification is also broadened. By further utilizing the chirped mirror and the compensation sheet to purify The pulse is chromatic dispersion compensated to obtain a pulse with a pulse width of 25 fs.With the purified laser pulse as a seed injected into the existing tWalp-Ti: sapphire chirped pulse amplification system, with an output pulse energy of 250 mJ and a width of 50 fs, In the case of a peak power of 5 TW, the pulse contrast ratio of 10 to (11) was verified in a range of 100 ps before the main pulse.