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Chen Y.-E.,Yanshan University | Chen Y.-E.,Canalaser Technologies Co. | Wang Y.,Canalaser Technologies Co.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering

A tunable single frequency laser with ultralow-noise and high vibration resistance is developed, and its working principle and structure design are introduced. The laser worked at 1 550 nm is consisted of a single frequency laser resonant cavity, a polarization containing optical fiber amplifier and a monitoring feedback optical path. By using a closed-loop temperature control technology, the laser shows a higher precision and stability, and its extremely temperature control resolution is up to 0.001°C. Using frequency components and a matched closed-loop system , the locked output frequency and power of the laser are implemented. The closed loop system not only gives the stability of wavelength and power, but also greatly reduces the low frequency noise of the laser system and effectively improves the laser damage threshold. As a result, the fiber laser can provide the long-term power stability better than 1% and the relative intensity noise better than -130 dBc/Hz. By selecting different types of seed light source cavities, the laser line-width can be controlled in the 1-400 kHz. Furthermore, the output power of fiber laser is 1 W and tunable wavelength is 3 nm. At 1 Hz, the phase noise is less than 10 μrad·Hz-1/2/m OPD and the shock resistance ability is 0.1g (g for the acceleration of gravity). Source

Chen Y.,Yanshan University | Chen Y.,Canalaser Technologies Co.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Glass formulation design is particularly important in laser glass preparation processes according to predetermined qualification. Traditional calculation systems of physical properties of inorganic oxide glass were outstanding representatives, but those systems usually do not involve glass spectral characteristics. The absorption properties of glass were calculated by considering the intrinsic vibration frequency and amplitude of doped laser glass and considering the Sellmeier equation and dispersion curve together. If the formulation design is changed based on the calculated glass spectrum performance, it could greatly shorten the development cycle and ensure quickly to find an optimal formulation in experiments. It is proved in the experiments that these formulations could be used to generate favorable glass states after the cooling process. Source

Carr D.W.,Symphony Sensors Inc. | Wang Y.,Canalaser Technologies Co.
Proceedings of SPIE - The International Society for Optical Engineering

The results of high-performance seismic sensors using advanced ultralow-noise single-frequency lasers are presented. We have developed a family of vibration sensors that are based on extrinsic optical Fabry-Perot cavities, and provide many advantages compared with other types of sensors, including conventional fiber sensors and electromagnetic sensors. These novel sensors offer substantial reduction in size and cost, while still providing competitive performance. Size reduction also means an effective reduction in deployment cost, which is very important in the remote areas where seismic sensor arrays are needed. © 2012 SPIE. Source

Chen Y.-E.,Yanshan University | Chen Y.-E.,Canalaser Technologies Co. | Wang Y.,Canalaser Technologies Co. | Qu X.-L.,Hunan Institute of Engineering
Chinese Physics Letters

Compared with traditional optical fiber lasers, double-clad photonic crystal fiber (PCF) lasers have larger surface-area-to-volume ratios. With an increase of output power, thermal effects may severely restrict output power and deteriorate beam quality of fiber lasers. We utilize the heat-conduction equations to estimate the maximum output power of a double-clad PCF laser under natural-convection, air-cooling, and water-cooling conditions in terms of a certain surface-volume heat ratio of the PCF. The thermal effects hence define an upper power limit of double-clad PCF lasers when scaling output power. © 2012 Chinese Physical Society and IOP Publishing Ltd. Source

Chen Y.-E.,Yanshan University | Chen Y.-E.,Canalaser Technologies Co. | Zhou Y.-K.,Metastable Materials Science and Technology National Key laboratory | Qu P.,Henan Institute of Science and Technology
Advanced Materials Research

Street lamps are indispensable social facilities. The power consumption of street lamps is quite astonishing. In this paper, we design a novel multi-surface reflector of street lamp, which is used AUTOCAD to generate reflector's surface, applied the optimization theory and optical software Tracepro. Multi-surface reflector of street lamps is reasonable in the distribution of light, full using of energy, and has incomparable advantages compared with the traditional reflector. Using the design of multi-surface street lamp and simulation of MATLAB, this article sets up maximum spacing model of one lamp and area of the largest model of two lamp basic on analysis of the characteristics of street lighting. From the lighting brightness and energy saving point of view, we give a reasonable height and spacing of street lamps, so that the design can meet the people on the lighting requirements, but also can save energy as much as possible. © (2012) Trans Tech Publications. Source

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