占 成1，吕晓华1，李德荣1，骆清铭1，陈 伟2，曾绍群1, 2*
（1. 生物医学光子学教育部重点实验室，华中科技大学，湖北 武汉430074；
2. 耶鲁大学神经生物学系，New Haven, CT, 06511）
摘要：分析了声光偏转器(acousto-optical deflector, AOD)对飞秒脉冲激光光斑的空间畸变效应。研究表明：由于飞秒激光在锁模情况下具有较宽的光谱带宽，经过AOD后的一级衍射光斑带有严重的角色散，导致光斑形状发生畸变，影响成像的空间分辨率。实验测试了一维AOD器件在不同声波频率下的光斑形状，获得了光斑尺寸的放大倍数，验证了AOD对飞秒激光的光斑畸变效应。
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On Light Spot Distortion of Femtosecond Laser Propagating
through an Acousto-optical Deflector
ZHAN Cheng1, Lü Xiao-hua1, LI De-rong1, LUO Qing-ming1, CHEN Wei 2, ZENG Shao-qun1, 2*
( 1. Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology, Wuhan 430074, Hubei,China; 2. Department of Neurobiology, Yale University, New Haven, CT, 06511)
Abstract: The light spot distortion effect of femtosecond laser pulses propagating through an acousto-optical deflector (AOD) was analyzed. Because of wide spectrum bandwidth of the mode-locked laser, When the AOD works, the light spot of the 1st diffraction order will be distorted by significant angular dispersion, thus reduces the spatial resolution of the image. With femtosecond laser pass AOD working at different acoustic frequencies, The shape and size of light spots were recorded, demonstrated the spot distortion properties.
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