Research progress of high precision micro structure glass optical element array molding technology

Fabrication of aspheric diffractive lens with high precision by precision glass molding

“…In the simulation mode, the displacement constraint was applied to the lower surface of the mold and sleeve, and the preform was a glass sphere with a diameter of 14 mm, a constant pressure is applied to the upper mold. The high-temperature viscoelastic parameters of glass and material parameters of mold and glass [4] were input into the simulation software, For the cooling annealing stage, the glass characteristic parameters and structural relaxation parameters calculated in the previous study are input in the simulation software [12] . Finally, the nodal values of the aspheric and mold were extracted along the radial direction from the center node, and the aspheric and mold equations were fitted by an interpolation method to calculate the simulated profile deviation.…”

“…Aspheric diffractive lens (ADL) is widely used in infrared optical systems as it can eliminate optical system aberrations while reducing chromatic aberrations [1] . Precision glass molding (PGM) is considered as one of the most promising technologies for large-scale manufacturing of high-precision ADL [2] . The materials of diffractive lens in most of the current studies are based on polymeric materials such as organic glass and photosensitive resins [3].…”

“…The materials of diffractive lens in most of the current studies are based on polymeric materials such as organic glass and photosensitive resins [3]. Compared with polymer, glass has the advantages of high temperature and humidity resistance and excellent optical properties, it is the most ideal material for optical ADL [4] . However, since the optical glass material has a high transition temperature, it requires the mold with high hardness and low thermal deformation in PGM.…”