The expression for exciting with a laser line source is derived through analyzing the principle of exciting surface ultrasonic waves by a laser point source.

通过对点光源激励声表面波的机理进行分析，推导出线光源激励的表达式。

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And actually, could one of the TFs grab the laser point?

事实上，其中一个TFs能不能找到那个激光笔？

哈佛公开课 - 计算机科学课程节选

You project the game field onto a the wall (in the case of Ground Kontrol, we taped up a few pieces of paper, which worked fine) and interact with objects using a laser point.

ENGADGET: Alpha Range iOS game requires a pico projector and laser pointer, we go hands-on (video)

An ingenious new laser called Waterlase adds to that the ability to cut through dry teeth and bone by casting a cloud of hot water vapor around the laser's cutting point, a couple of millimeters from the tooth.

FORBES: Magazine Article

Laser pens are sold as office equipment used to point out details on presentations.

BBC: Laser pens 'threaten Gatwick passenger safety'