1. Is the lens glass or resin?

At present, lens materials are mainly resin and optical glass.

Resin and optical glass have their own advantages and disadvantages. Resin can be molded, so the cost of making aspheric surfaces will be greatly reduced. Of course, some optical glasses can also be molded, but if the aperture is large, it will be more difficult. The disadvantages of resin materials are that the optical refractive index and transmittance are not as good as some optical glasses, and the damage threshold is relatively low. In the application of high energy density, resin or glued parts cannot be used.

Therefore, it is now used for imaging, and requires a small number of lenses and low cost. For example, mobile phone lenses are mostly made of resin materials. However, in the collimation coupling system of medium and high power lasers, optical glass materials will be selected.

Specific analysis of specific questions, I hope the above answers will help you.