激光指示器,又称为激光笔、指星笔等,是把可见激光设计成便携、手易握、激光模组(发光二极管)加工成的笔型发射器。常见的激光指示器有红光(λ=650~660nm, 635nm)、绿光(λ=515-520nm, 532nm)、蓝光(λ=445~450nm)和蓝紫光(λ=405nm)等。 通常在汇报、教学、导游人员都会使用它来投映一个光点或一条光线指向物体,但它在特定场所,例如艺术馆(有些画作怕光)、动物园等都不宜使用。 不当使用激光笔可能造成视网膜受损,甚至失明,儿童不宜使用。
因为我们有我的红色激光笔,我们也会尝试红色激光笔,它的中心波长是 700 纳米。
Since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.
如果你以另一种方式转动它,它就变成一支触控笔,再换一种方式转动,它就变成一支激光笔。
If you do it the other way, it becomes a stylus tip and in another way, it becomes a laser pointer.
能借用一下您的激光笔吗?
And then since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.
然后因为我们有我的红色激光笔,我们也可以用它试一下,它的波长集中在700纳米处。
But luckily we had the control of the red laser pointer where nothing moved at all.
但是很幸运我们可以,控制红色激光笔,虽然什么都没有移动。
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?
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