How does fiber resist bending?

Glass is an important material for the advancement of human civilization Glass, light, time, cold, and cleanliness are just a few of the commonplace concepts that have led to the development of world civilization. How we got to now is a new way of thinking through the lens of historical development.

Celebration: Signing new bills! The bell is ringing for the second time in July!

Theoretical calculation of the diameter d of the focused spot？ How much can the smallest focused spot of a certain wavelength of laser reach? How to make the focus spot thinner?Why do focusing systems use beam expander? ...After the laser beam is focused by the lens, the minimum position of the sp