Fabrication of hybrid optical line generator by direct machining

Abstract

In this study, a mold of a line generator consisting of a cylindrical lens array with a triangular diffractive grating was ultra-precision diamond machined with Moore 350FG 5-axis ultra-precision machine. The design and the simulation of the hybrid structure were performed using ray tracing and exact electromagnetic theory. The machined hybrid lens structure was replicated to a UV-curable polymer and was then characterized and tested. The optical measurements show that the hybrid element works as designed.

Direct Laser Writing of Diffractive Structures on Bi-Layer Si/Ti Films Coated on Fused Silica Substrates

“…These elements are widely used in various industrial and scientific applications. To date, the following main methods for the formation of diffractive elements with a structured surface can be distinguished, which are most common in industrial practice: photolithographic technology [1][2][3][4][5], interference holographic method [6,7], diamond turning technology [8][9][10] and scanning one-or multi-spot direct laser writing on thin films without photoresist [11][12][13][14]. To form a given microrelief structure on metal films deposited on an optical substrate, as a rule, photolithographic technology is actively used.…”