Hu Qinglei, Zhou Zhenqiao, Lv Xiaohua, Zeng Shaoqun
Opt Lett. 2016 Jan 15;41(2):207-10. doi: 10.1364/OL.41.000207.
Compensation of spatial dispersion caused by the acousto-optic deflector (AOD) when using a femtosecond laser is difficult across the whole scanning range of the system, and this is a significant impediment to its use. In conventional methods, the dispersion of the AOD was compensated only when it was at a particular position, while at other positions, the quality of the light beam was reduced. We developed a novel method for compensating the spatial dispersion within the entire scanning range using a special Keplerian telescope. Our experimental results show that the residual dispersion of the AOD is compensated sufficiently, and the focal spots of the laser reach the diffraction limit within a 40-MHz ultrasound bandwidth.
在使用飞秒激光时，要在系统的整个扫描范围内补偿由声光偏转器（AOD）引起的空间色散是困难的，这对其使用是一个重大障碍。在传统方法中，仅当AOD处于特定位置时才对其色散进行补偿，而在其他位置时，光束质量会降低。我们开发了一种使用特殊开普勒望远镜在整个扫描范围内补偿空间色散的新方法。我们的实验结果表明，AOD的残余色散得到了充分补偿，并且激光焦斑在40MHz超声带宽内达到了衍射极限。
