The Development of technology is causing the smaller devices. So, optical components are decreasing in volume. For example, the DOE(Diffractive Optical Elements) Si lens is thin than a lens, it was usually used for biomedical devices, hologram, optical sensor, mobile phone, etc. But the fabrication of the DOE Si lens have very limited to machining. The ultra-precision machining of DOE by using the DTM(Diamond Turning Machine) could have cause surface defects such as whitening phenomenon and rainbow effect on the surface. This problems cause optical defect such as a scattering of light. We carried out a ultra-precision machining of the DOE(Diffractive Optical Elements) Si lens by using the DTM with laser assisted module. We can be optimize the machining conditions in several machine processes, such as edge angle of diamond tool, power of laser, cutting depth, feed rate. As a result, we are successfully machined the DOE Si lens with a surface roughness of several nano-meter
The CaF2 optical lens was widely used from ultraviolet- to infrared- wavelength range. The CaF2 has optical properties with high transmittance and low reflectance. Usually, it used for laser optics, excimer laser, CaF2 Lens, ultraviolet to infrared lens and cryogenic cooling thermal imaging systems. It is usually difficult to machining using natural diamond tools, because CaF2 is a brittle material.
In theoretical calculations and experimental verification, we executed the ultra-precision machining of CaF2 lens by using the Single-point diamond turning machine(DTM) with laser-assisted modules. The machining of CaF2 materials is affect the negative angle of a diamond tool and laser power, etc. Repeated experiments show that surface of the CaF2 lens more than 150% better by using laser-assisted modules and negative angle tools than conventional DTM machining.
We designed freeform reflector and lenses to develop black box that can be shot 360-degree with one channel to overcome for disadvantage of previous black box camera. The optical performance and optical path were simulated by using the optics design software such as Zemax. Our black box is located at the top of the vehicle, And, the Field of view of our camera is designed to shoot up to about 4 meters from the vehicle.
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