Infrared and Laser Engineering, Volume. 46, Issue 6, 616001(2017)
Cylindrical optical micro-structure used in infrared laser protection
Laser protection is a technology of wide application. Aimed at the problem that strong absorption in visible wavelengths and equipment or operator injury caused by laser high-reflective film specular reflection exist in infrared laser protection technology, an infrared laser non-specular reflection optical micro-structure formed on optical material surface was presented. It had little effect on visible light transmission and large-angle scattering to 1 064 nm laser. Light track method was used to design double-side micro-cylindrical lens arrays with a dislocation construction. Array period T and curvature radius of lens units R should meet the condition: 0<T<R/2■. Virtual-Lab optical modeling software was applied for the simulation of designed micro-cylindrical lens arrays. The results is that, average transmittance rate of visible light drops 7%, which has little impact on practical result, and which can be made up by visible wavelengths fabrication antireflection coating; 1 064 nm infrared laser reflection is greater than 75%, divergence angle is greater than 30°. Fabrication experiment of micro-cylindrical lens arrays was finished by digital mask lithography technology, the test result was similar to simulation result. The conclusion is that, micro-cylindrical lens arrays can cause wide-angle scattering, which greatly reduces the single-directivity reflection echo energy of laser to achieve the purpose of laser protection.
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Sun Yanjun, Liu Shunrui, Wu Boqi, Wang Li, Wang Jun. Cylindrical optical micro-structure used in infrared laser protection[J]. Infrared and Laser Engineering, 2017, 46(6): 616001
Category: 微纳光学
Received: Oct. 15, 2016
Accepted: Nov. 19, 2016
Published Online: Jul. 10, 2017
The Author Email: Yanjun Sun (custsun@126.com)