On the basis of close analysis of the drawback in conventional fabrication techniques of binary optical element, this paper presents a new method for fabricating optical element. This method can be called transverse-adding fabrication technique(TAFT), and it is developed from the rapid prototyping technique used in microelectronic processing and micro-machining. The principal objective developing this technique is to realize the compatibility of micro-optics with microelectronics and micro-machining technique to provide technical support for the integrated single-chip micro photo-electromechanical system. An explanation for the technological principle and process of this technique is stated. By analyzing experimental data, the selection of materials and corresponding process parameters for implementing this technique were determined. The main process error of this technique, alignment error, was analyzed and calculated. In addition, a computerized simulation was carried out. Analysis shows that this technique can not only fabricate continuous phase component, its diffraction efficiency is insensitive to the alignment error as well. It is therefore clear that the transverse-adding fabrication technique is a feasible technique for fabricating binary optical elements and has an advantage over conventional techniques in fabricating precision.
The fracture toughness of high-temperature alloy material under high-temperature is tested with the laser moire interfrometric device. The zero-thickness grating is etched on the surface of test piece by electrochemical method directly, expanding the research space of high-temperature alloy’s moire interferometry. The moire fringe is collected and analyzed by CCD imaging system of computer, the test result that indicates imaging quality and measurement precision of moire interferometry are improved.
A novel device and corresponding techniques are proposed, which are the transverse element of binary optics and transverse-adding technique. The transverse-adding technique of binary optics can be used to fabricate microelectronic elements and micro-mechanical elements very well. By using this technique, the micro-photoelectric-mechanical systems can be integrated on a single chip. The fabrication model and method of Fresnel diffractive lens with Transverse-adding technique are presented. It is demonstrated that the diffractive efficiency of Fresnel diffractive lens fabricated with this technique can reach 100% by theoretic analysis. In addition, the diffractive efficiency of this kind of Fresnel diffractive lens is independent of technique error.
Proc. SPIE. 5643, Advances in Optical Data Storage Technology
KEYWORDS: Holography, Digital image processing, 3D image reconstruction, Digital holography, Data storage, Image processing, Remote sensing, Image storage, Holographic data storage systems, Binary data
This paper brings forward one concept of holographic storage of multi-level digital data at first. It is that each pixel includes more information than 1 bit, which means that a multi-level digital data image provides more information than a binary digital data image with the same pixels. So, the capacity will be increased with this technology. Furthermore, some aspects of holographic storage of multi-level digital data, such as the multi-level coding, storage characters and the quality of the stored image are debated. Finally, we research this holographic storage technology by experiment.
In this paper, the diffractive efficiency in Ce:SBN photorefractive crystal was measured using two-wave coupling light path. The light-induced scattering resistance was gained through observing the transmitted light spot. Furthermore the other holographic storage properties such as the quality of the stored image and preservation time were studied. Finally using Ce:SBN photorefractive crystal as the storage medium, storing and reconstructing the holographic image were realized.
This paper introduces the design of optics, power driver and control system of a high power semiconductor medical laser. The instrument adopts 980nm laser with maximum power output of 2W as therapeutic beam and 670nm laser of 3mW as aiming beam. The laser beams, after being collimated , can either be transmitted directly or be coupled through an optical fiber. In the driver of therapeutic laser, there exist current supply, protection circuit , temperature controller and light power feedback loop. The whole system is controlled by a microprocessor. With appropriate hardware and software, we've achieved , in our driver ,a variety of protection features including the ability to suppress transients and reduce noise, relay shorting protection , soft turn-on , current limit and overvoltage shut-off ,which keep the laser diode from damage. Meanwhile, we've also obtained a continuously adjustable optical power output with high accuracy and stability , both of which are vital to a safe and reliable