Are there apertures and gratings in the laser device? What's the use of each?
can also be used for optical grating, optical pulse compression, optical phase modulation and so on, a lot of space!
The effect of grating is much, in the inside, he is used to provide dispersion, such as fiber laser inside the fiber grating, chirped grating laser in the giant inside of
Of course, the diaphragm is used to control the beam width in the light path.
