In this talk, we are going to present our new try to set up National Optical Education Small Private Online Course (SPOC) system, which relates about 15 universities who has optical engineering education around China. The SPOC system is guided by the National Teaching Steering Committee, and is designed to enhance the sharing the best teaching and training resources in the advanced university to the other universities all over the China.
Through careful consideration of key factors that impact upon voxel attributes and image quality, a volumetric three-dimensional (3D) display system employing the rotation of a two-dimensional (2D) thin active panel was developed. It was designed as a lower-cost 3D visualization platform for experimentation and demonstration. Light emitting diodes (LEDs) were arranged into a 256x64 dot matrix on a single surface of the panel, which was positioned symmetrically about the axis of rotation. The motor and necessary supporting structures were located below the panel. LEDs individually of 500 ns response time, 1.6 mm×0.8 mm×0.6 mm external dimensions, 0.38 mm×0.43 mm horizontal and vertical spacing were adopted. The system is functional, providing 512×256×64, i.e. over 8 million addressable voxels within a 292 mm×165 mm cylindrical volume at a refresh frequency in excess of 16 Hz. Due to persistence of vision, momentarily addressed voxels will be perceived and fused into a 3D image. Many static or dynamic 3D scenes were displayed, which can be directly viewed from any position with few occlusion zones and dead zones. Important depth cues like binocular disparity and motion parallax are satisfied naturally.
Since present display technology is projecting 3D to 2D, people's eyes are deceived by the loss of spatial data. So it's a revolution for human vision to develop a real 3D display device.
The monitor is based on emissive pad with 64*256 LED array. When rotated at a frequency of 10 Hertz, it shows real 3D images with pixels at their exact positions. The article presents a procedure that the software possesses 3D object and converts to volumetric 3D formatted data for this system. For simulating the phenomenon on PC, it also presents a program remodels the object based on OpenGL. An algorithm for faster processing and optimizing rendering speed is also given.
The monitor provides real 3D scenes with free visual angle. It can be expected that the revolution will bring a strike on modern monitors and will lead to a new world for display technology.
It has been proved that gain volume scaling can be successfully applied to achieve high output power and a compact design. The waveguide material is metallic and diffusion-cooled, thus heat removal is more efficient. It is easy for the annular system consisting of two coaxial tubes to keep in shape and maintain mechanical stability. Annular gain media offer large gain volume with short axial dimensions. The resonator structure, principles of gain volume scaling and characteristics of the output power are presented in this paper. The outer diameter of annular waveguide walls is 20mm; an output power of 75W at wavelength 10.6µm has been obtained from a guide gap of 2.25mm and a gain length of 150mm. The annularly shaped output beam can be used directly for making holes. Moreover, according to its axisymmetrical structure and the law of refraction, by using two small prisms of the exact same material, it is possible to transform the annular beam into a solid beam by careful selection of the incident angle. Further, the diameter of the annular beam varies once the space between two prisms is changed.