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长春光学精密机械与... [12]

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限定条件	内容类型：会议论文专题：长春光学精密机械与物理研究所第一署名单位第一作者单位通讯作者单位

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	Design and fabrication of imaging optical systems with freeform surfaces (EI CONFERENCE) 会议论文 Current Developments in Lens Design and Optical Engineering XIII, August 13, 2012 - August 15, 2012, San Diego, CA, United states Zhang X.; Zheng L.; He X.; Wang L.; Zhang F.; Yu S.; Shi G.; Zhang B.; Liu Q.; Wang T. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 Freeform surfaces provide more degrees of freedom for design of optical systems and enhance the ability of compensation and correction aberrations. Freeform surfaces are of advantage to balance the unsymmetrical aberrations especially for the wide-field off-axis optical systems. This paper focus on an off-axis reflective optical system which focal length is 550mm F# is 6.5 and field of view (FOV) is 76. The system adopts some freeform surfaces. We discuss the problems we noticed in processes of design manufacture measurement and alignment and the solutions. At last the periodical research result and the expected performance are given. 2012 SPIE.
	Electrically pumped organic laser device with a coupled microcavity structure 会议论文 2012 Liu X. Y.; Lin J.; Li Y. T.; Qu S. N. 收藏 \| 浏览/下载：7/0 \| 提交时间：2013/03/28
	A nanometer scale alignment method of concentric spherical mirrors based on interferometry (EI CONFERENCE) 会议论文 4th IEEE International Nanoelectronics Conference, INEC 2011, June 21, 2011 - June 24, 2011, Tao-Yuan, Taiwan Liu Y.-J.; Tang Y.-G.; Chen S.; Xu T.; Pan M.-Z. 收藏 \| 浏览/下载：12/0 \| 提交时间：2013/03/25 A nanometer scale alignment method of spherical concentric mirrors based on dual-beam interferometry is proposed which is also the method to measure the defocus of concentric spherical mirrors. In the process of aligning the concentric spherical mirrors the defocus can be measured real time with nanometer scale error. The experimental result shows that the method can achieve the defocus of the spherical concentric mirrors several nanometers. 2011 IEEE.
	Analysis Model of X-ray Coherent Scatter Images 会议论文 2010 Liu T. H.; Li Y. H.; Liu J. X.; Qiao S.; Song J. Z. 收藏 \| 浏览/下载：9/0 \| 提交时间：2013/03/28
	Analysis model of X-ray coherent scatter images (EI CONFERENCE) 会议论文 3rd International Conference on BioMedical Engineering and Informatics, BMEI 2010, October 16, 2010 - October 18, 2010, Yantai, China Liu T.; Liu J.; Li Y.; Qiao S.; Song J. 收藏 \| 浏览/下载：17/0 \| 提交时间：2013/03/25 X-ray coherent scatter imaging with diagnostic equipment is feasible. The energy distribution extracting from image is a way to get information hidden in images. In this paper a new analysis model of x-ray scatter images was presented. With the model some situations of real coherent scatter image affected by noise eccentricity and energy distribution were simulated. The result shows that the clinical x-ray coherent scatter can be simulated well by a Gauss distribution model. And an inner correlation algorithm was discussed to help calculate center approaching the theory center with the model. 2010 IEEE.
	The algorithm of extracting energy curve from X-ray coherent scatter images (EI CONFERENCE) 会议论文 2010 6th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2010, September 23, 2010 - September 25, 2010, Chengdu, China Liu T.; Liu J.; Qiao S.; Xie C.; Song J. 收藏 \| 浏览/下载：9/0 \| 提交时间：2013/03/25 This paper presents a new method to calculate the Euclidean distance among pixels by taking the gray value of a pixel as the distance weight. The energy distribution curve extracted from coherent scatter images with this method. The signal value of the curve has been intensified and the noise has been reduced effectively. 2010 IEEE.
	The Algorithm of Extracting Energy Curve from X-ray Coherent Scatter Images 会议论文 2010 Liu T. H.; Liu J. X.; Qiao S.; Xie C. J.; Song J. Z.; Ieee 收藏 \| 浏览/下载：4/0 \| 提交时间：2013/03/28
	Research of improving the accuracy of license plate character segmentation (EI CONFERENCE) 会议论文 5th International Conference on Frontier of Computer Science and Technology, FCST 2010, August 18, 2010 - August 22, 2010, Changchun, China Qiao S.; Zhu Y.; Li X.; Liu T.; Zhang B. 收藏 \| 浏览/下载：24/0 \| 提交时间：2013/03/25 In order to improve the accuracy of license plate character segmentation use line-shape filter to remove plate frames. Then character segmentation approach combines projection and inherent characteristics of character this paper strengthens preprocessings before segmentation. In character binarization can better solve character adhesion and fracture problem. For tilted characters only in horizontal direction use improved Bemsen method to reduce noise interference even without tilt correction this method can achieve better segmentation. Experiment results shows the accuarcy of character segmentation reaches 97%. 2010 IEEE.
	Low drive-voltage and high-bandwidth electro-optic modulators based on BaTiO3 thin-film waveguides (EI CONFERENCE) 会议论文 Science and Technology of Dielectrics for Active and Passive Photonic Devices - 210th Electrochemical Society Meeting, October 29, 2006 - November 3, 2006, Cancun, Mexico Sun D. G.; Fu X. H.; Liu Z. F.; Ho S. T.; Wessels B. W. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 We investigated electro-optic modulator structures to target low drive voltage high-speed modulation and small device size with c-axis grown BaTiO3/MgO ferro-electric thin films. In this study the calculations are focused on the ideal thin film with a quadratic relation between the half-wave drive voltage V and the interaction length L in the electro-optic modulation case we obtained in previous work. With the quadratic electro-optic modulating relation and the optimal rib waveguide structure of BaTiO3/MgO thin films the frequency-voltage-size performances for 2.5GHz 10GHz 40GHz and 100GHz modulation bandwidths have been obtained under half-wave drive voltages of 0.8V 1.6V 3.0V and 4.8V respectively for the ideal film with r51=730 pm/V at 1550nm wavelength where both the phase velocity matching condition and the conductor induced microwave attenuation are considered. The required device lengths to achieve these four typical values of modulation bandwidth are 3.3 mm 0.8 mm 0.4 mm and 0.2 mm respectively. With the c-axis grown BaTiO3/MgO crystal thin films and the quadratic electro-optic modulating relation an electro-optic coefficient of reff=180 pm/V for the c-axis grown BaTiO3/MgO ferro-electric thin films was measured which is relatively far from the ideal value of r51=560 pm/V. copyright The Electrochemical Society.
	High-power InGaAs/GaAs VCSEL's two-dimension arrays (EI CONFERENCE) 会议论文 ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China Li T.; Yongqiang N.; Yanfang S.; Zhenhua J.; Liu Y.; Wang L.-J. 收藏 \| 浏览/下载：24/0 \| 提交时间：2013/03/25 Selectively oxidized InGaAs/GaAs vertical -cavity surface-emitting lasers (VCSEL) array at an emission wavelength of 980nm was reported. A 16 elements array with 200m aperture size (250m center spacing) of individual elements shows a CW output power of 1.21 W at room temperature resulting in 1 KW/cm2 average optical power density. The device threshold current is 1.32A The lasing peak wavelength is 981.9 nm the full width at half-maximum is 0.7 nm and the far-field divergence angle is about 17.The characteristics of a single device with a active region diameter of 800m is compared with that of a 2-D array with active region diameter of individual clement of 200m. These two kinds of devices have the same total lasing area. At the same current injection the single device has a higher threshold and a higher output power than the array. The red shift of single device is more obvious than that of the array's.

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