We discuss optical elements based on the sulfur monochloride copolymers (DSG: disulfide glass, poly(S2-TIC-Cl2)) for IR imaging applications. DSG copolymers show high refractive index, excellent transparency, low birefringence, and low dispersion compared with conventional optical polymer materials. The excellent thermomechanical properties allow for both molding and diamond-turning fabrication. The diffraction angle of a molded optical diffraction grating agreed well with the design and a diamond-turned plano-convex lens shows a 1.8 times larger imaging area compared to a BK-7 lens of the same dimensions.
Zinc sulfide (ZnS) exhibits unique properties that make it highly suitable for applications as a multi-wavelength optical element. Its transmittance shows significant improvements in the visible light and near-infrared regions when subjected to high-temperature and high-pressure processes. However, the mechanical cutting of ZnS is limited due to its brittleness and polycrystalline properties. In this study, we propose the feasibility of employing ultrasonic vibration cutting to enable the mechanical cutting of polycrystalline zinc sulfide. The objectives are to analyze both the ductile mode machining and brittle fracture behavior while addressing the issue of spring back encountered during the diamond turning process. Analysis is conducted on cutting parameters, including vibration amplitude, spindle speed, cutting depth, and feed rate, to evaluate their impact on the cutting process. The results showed that we establish ultrasonic vibration cutting can indeed lead to improved cutting quality under specific conditions. We demonstrated the potential of ultrasonic vibration cutting as a promising alternative technique for the precision machining of polycrystalline zinc sulfide. The resolution of the spring back problem represents a significant advancement, potentially enabling the manufacturing of high-quality optical elements using polycrystalline material.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.