# Introduction of different reflective lenses

**URL:** <https://forum.cloudray.com/t/introduction-of-different-reflective-lenses/462>\
**Category:** CO2 Lens\
**Created:** [July 16, 2021, 6:33am UTC](https://forum.cloudray.com/t/introduction-of-different-reflective-lenses/462 "2021-07-16T06:33:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Technician](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/technician/32/15_2.png) [@Technician](https://forum.cloudray.com/u/Technician)\
**Post date:** [July 16, 2021, 6:33am UTC](https://forum.cloudray.com/t/introduction-of-different-reflective-lenses/462/1 "2021-07-16T06:33:06Z")

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Silicon mirror：The substrate silicon, which has good optical and thermal properties, can greatly increase its reflectivity after being coated with a reflective film on the surface of the silicon, which is about 98-99%, almost avoiding the loss of light caused by reflection.

Molybdenum reflective lens：The molybdenum substrate is directly polished, the surface is not coated, it is resistant to scrubbing, and has a long service life. However, because the molybdenum mirror is not coated, its reflectivity is low, about 88%-90%, and there is light loss after reflection.