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Where is the gap between laser protect lens
Posted on:
2022-11-09
At present, there are many specifications and varieties of laser protect lens lenses on the market, and the prices are also uneven. Where are the differences in the materials used and the price differences of these lenses?
Let me give you a detailed introduction from the base material of laser protect lens:
Optical glass (BK7/K9)
BK7(K9) laser protect lens is one of the common high borosilicate crown glasses, the transmission range is 380nm ~ 2100nm, it has high homogeneity, low bubble and impurity content, and can be directly used as transmission optical material. BK7 has high hardness and good scratch resistance. However, it has a large coefficient of thermal expansion and is not recommended for temperature sensitive applications.
Therefore, the BK7 (K9) laser protect lens material is susceptible to high temperature expansion and cracking, and is basically not used in the laser cutting range. Due to its low cost, it is often used in the low-power (≤500W) laser welding field.
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