怎样对准激光？
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利用两个相同高度的光阑，重复调节两个镜子，能使激光水平传播；2. 使用类似的方法还能使两束光重叠在一起。
参考资料：Understanding "Walking the Beam"
http://experimentationlab.berkeley.edu/sites/default/files/Mini-Project%20Report.pdf
参考资料：Understanding "Walking the Beam"
http://experimentationlab.berkeley.edu/sites/default/files/Mini-Project%20Report.pdf
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