Tatemichi H, Yamamoto M
Appl Opt. 1993 Jul 10;32(20):3700-5. doi: 10.1364/AO.32.003700.
We describe a feasibility study of a multiplexed holographic recording method onto a moving storage medium by using moving interference fringes caused by diffracted light beams that are generated from an acousto-optic deflector (AOD). The AOD, driven by amplitude-modulated electric signals, generates several diffracted beams with different frequencies because of Doppler shifting by AOD driving-frequency components. The interference between the beams results in a nonstationary light intensity distribution, i.e., a moving interference fringe. Its velocity is reduced by an image-reduction optical system, and the storage medium is moved at the same velocity as the fringe motion at the image-formation point. This compensates for a reduction of visibility with the movement of the medium, so a holographic recording onto a moving medium can be achieved. In addition, angular multiplexing is achieved by switching the AOD driving frequencies.
我们描述了一种通过使用由声光偏转器（AOD）产生的衍射光束所引起的移动干涉条纹，在移动存储介质上进行复用全息记录方法的可行性研究。由幅度调制电信号驱动的AOD，由于AOD驱动频率分量引起的多普勒频移，会产生多个不同频率的衍射光束。这些光束之间的干涉会导致非平稳光强分布，即移动干涉条纹。其速度通过图像缩小光学系统降低，并且存储介质以与图像形成点处条纹运动相同的速度移动。这补偿了随着介质移动而导致的可见度降低，从而可以在移动介质上实现全息记录。此外，通过切换AOD驱动频率来实现角度复用。
