2012
2012
-
Record 133 of
Title:Optical design of satellite laser communication integrative transceiver
Author(s):Cheng, Yanyan(1); Fan, Xuewu(1); Zou, Gangyi(1); Yan, Peipei(1); Liu, Kai(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8415 Issue: DOI: 10.1117/12.973763 Published: 2012Abstract:According to technical requirements of satellite optical communication, a set of optical system of transmitter and receiver with a common optical antenna is designed at 850nm. We select a Cassegrain-type afocal off-axis system as the optical antenna structure. The entrance pupil diameter is 150 mm. The field of view of transmitter and receiver is ±100μrad and ±5mrad, respectively. This optical system has a simple and feasible configuration. The design results show that system performances are acceptable. The MTF is close to the diffraction limit. The energy concentration ratios are more than 90% at 30μm of diameter of circle. The RMS of wave front aberration is less than λ/20. ? 2012 SPIE.Accession Number: 20131416168465 -
Record 134 of
Title:Wave-front curvature compensation of polarization phase-shifting digital holography
Author(s):Min, Junwei(1,2); Yao, Baoli(1); Gao, Peng(1); Ma, Baiheng(1); Yan, Shaohui(1); Peng, Fei(1); Zheng, Juanjuan(1); Ye, Tong(1,3); Rupp, Romano(4)Source: Optik Volume: 123 Issue: 17 DOI: 10.1016/j.ijleo.2011.09.018 Published: September 2012Abstract:An on-axis polarization phase-shifting digital holographic microscope, based on a normal upright optical microscope, is constructed to quantitatively measure both the amplitude and phase distributions of specimen. The condenser lens and microscope objective employed in the object beam path enhance the illumination and magnification of the image, however, they induce additional phase aberration of the object wave. The physical formation of the phase aberration is theoretically analyzed, and a formula for the object wave front involving the phase aberration in the CCD plane is derived. The phase aberration can be eliminated in the reconstruction procedure by measuring a specimen-free hologram and then fitting the aberration phase with a least square ellipsoidal model to determine the parameters of the system. This phase aberration compensation procedure also reduces some of noises in the reconstructed phase of the specimen. The practicability of this method is demonstrated by a test experiment on microlenses. ? 2011 Elsevier GmbH. All rights reserved.Accession Number: 20123115292909 -
Record 135 of
Title:Stressed waveguides with tubular depressed-cladding inscribed in phosphate glasses by femtosecond hollow laser beams
Author(s):Long, Xuewen(1,2); Bai, Jing(1,2); Zhao, Wei(1); Stoian, Razvan(3); Hui, Rongqing(4); Cheng, Guanghua(1)Source: Optics Letters Volume: 37 Issue: 15 DOI: 10.1364/OL.37.003138 Published: August 1, 2012Abstract:We report on the single-step fabrication of stressed optical waveguides with tubular depressed-refractive-index cladding in phosphate glasses by the use of focused femtosecond hollow laser beams. Tubelike low index regions appear under direct exposure due to material rarefaction following expansion. Strained compacted zones emerged in domains neighboring the tubular track of lower refractive index, and waveguiding occurs mainly within the tube core fabricated by the engineered femtosecond laser beam. The refractive index profile of the optical waveguide was reconstructed from the measured transmitted near-field intensity. ? 2012 Optical Society of America.Accession Number: 20123315331949 -
Record 136 of
Title:An engineering prototype of Hadamard transform spectral imager based on Digital Micro-mirror Device
Author(s):Sun, Xin(1,2,3); Hu, Bing-Liang(1,2); Li, Li-Bo(1,2); Wang, Zhong-Hou(1,2)Source: Optics and Laser Technology Volume: 44 Issue: 1 DOI: 10.1016/j.optlastec.2011.06.020 Published: February 2012Abstract:An engineering prototype of Hadamard transform spectral imager for object detection is presented. The programmable mask, using Digital Micro-mirror Device, is set on the second image plane to implement the function of spectral domain encoding. This method can significantly increase the detecting possibility with improved SNR of the relatively weak spectrum signature. A refractive configuration designed for visible spectrum application is proposed, and the optical design strategies of each functional unit are described in detail in order to meet both the image quality and the structural feasibility. The method of mask positioning is studied and the promising spectral recovery results based on the laboratory experiments are presented. ? 2011 Elsevier Ltd. All rights reserved.Accession Number: 20113214227804 -
Record 137 of
Title:Experimental study on vibration absorption characteristic of non-obstructive particle damping beam
Author(s):Wang, Wei(1); Li, Yuyan(2)Source: Applied Mechanics and Materials Volume: 138-139 Issue: DOI: 10.4028/www.scientific.net/AMM.138-139.588 Published: 2012Abstract:Non-obstructive particle damping(NOPD) is developing in combination with particle damping technique, impact damping technique and material science. NOPD technology has good damping characteristic and nicer effect on vibration absorption. In the paper experiments of vibration absorption characteristic for beam applying NOPD are done and some conclusions are obtained, which affords important reference for engineering application of NOPD technique.Accession Number: 20114814571584 -
Record 138 of
Title:Polarization behavior of femtosecond laser written optical waveguides in Ti:Sapphire
Author(s):Bai, Jing(1,2); Cheng, Guanghua(1); Long, Xuewen(1,2); Wang, Yishan(1); Zhao, Wei(1); Chen, Guofu(1); Stoian, Razvan(3); Hui, Rongqing(4)Source: Optics Express Volume: 20 Issue: 14 DOI: 10.1364/OE.20.015035 Published: July 2, 2012Abstract:Ultrashort pulsed laser photoinscription of Ti:Sapphire crystals may result in the self-organization of nanoscale material redistribution regions in regular patterns within the laser trace and stress-induced birefringence around the laser trace. We report on the formation of anisotropic optical waveguides in Ti:Sapphire by a procedure that involves femtosecond laser inscription of adjacent nonguiding birefringent traces with nanopatterned crosssections and the accumulation of stress birefringence in the region between. Double parallel line structures with a separation of 25μm with vertical and horizontal nanoscale arrangements were written with a choice of orthogonal polarizations. Due to anisotropic light scattering on periodic nanostructures and stress-induced birefringence in the central zone, remarkable polarization dependent guiding effects were observed as a function of the microscopic geometry of the structures. Building on this polarization sensitivity, several structure such as 3 × 3 waveguide arrays, diamond and hexagon patterns are also investigated. ? 2012 Optical Society of America.Accession Number: 20122915258794 -
Record 139 of
Title:Monomode optical waveguides in Yb3+-doped silicate glasses produced by low-dose carbon ion implantation
Author(s):Liu, Chun-Xiao(1,4); Cheng, Shu(2); Li, Wei-Nan(1); Wei, Wei(1,3); Peng, Bo(1,3)Source: Japanese Journal of Applied Physics Volume: 51 Issue: 5 PART 1 DOI: 10.1143/JJAP.51.052601 Published: May 2012Abstract:The planar waveguide has been fabricated in the Yb3+-doped silicate glass by 4.0 MeV C2+ ion implantation at a dose of 2 × 1014 ions/cm2. The guided modes are measured using a model 2010 prism coupler at 633 nm. The near-field profiles of the planar waveguide are obtained with an end-face coupling system. The refractive index profile of the waveguide is reconstructed by the intensity calculation method, which shows a typical "enhanced well + barrier" distribution. The SRIM'2006 code is carried out to simulate the energy loss during the implantation in order to obtain a better understanding of the waveguide formation. After post-implantation treatment at 260 °C for 1 h, the waveguide possesses a propagation loss of ～1:42 dB/cm. The acceptable guiding properties suggest that further waveguide lasers may be realized on the C-implanted Yb3+-doped silicate glass waveguides. ? 2012 The Japan Society of Applied Physics.Accession Number: 20122215073571 -
Record 140 of
Title:The influence of the stray light on MTF in optical system in test range
Author(s):Duan, Jing(1); Mei, Chao(1,2); Jiang, Kai(1,2); Wang, Yang-Bin(1)Source: Information Optoelectronics, Nanofabrication and Testing, IONT 2012 Volume: Issue: DOI: Published: 2012Abstract:The imaging quality of the optical system can be affected by the stray light, so people want to know the stray light suppression level requirements of the optical system. Usually, the stray light suppression level requirements of the optical system is represented by the PST or the coefficient of stray light level. Although, in china, the GB show us the requirement of 3%～5%[1], the standard of the GB can not directly guide the designer to design for that we can not know how large the PST of the optical can decrease the imaging quality of the optical system. So the paper will analyse the the influence of the PST on the imaging quality of the optical system in test range. The imaging quality of the optical system can be shown by MTF directly, so the paper will find the relationship between the PST and MTF in test range. ? 2012 OSA.Accession Number: 20132516438545 -
Record 141 of
Title:A novel design of fiber-optic sagnac current sensor
Author(s):Cao, Hui(1); Shi, Nianbao(1); Xu, Jintao(1)Source: Proceedings - 2012 5th International Symposium on Computational Intelligence and Design, ISCID 2012 Volume: 2 Issue: DOI: 10.1109/ISCID.2012.174 Published: 2012Abstract:The principle of in-line Sagnac interferometer current sensor is presented. To simplify the modulation and eliminate the error caused by cross coupling, a new structure of current sensor is proposed here. Two end mirrored sensing fibers are winded around the conductor reversely. The modulating is much simpler and a simple analysis using Jones matrix has shown that this current sensor is feasible. ? 2012 IEEE.Accession Number: 20130716008300 -
Record 142 of
Title:Based on active vibration control technology of signal acquisition system research
Author(s):Chu, Jiawei(1,2); Xu, Ruihua(1); He, Junhua(1); Wei, Mingzhi(1); Wang, Wei(1)Source: Advanced Materials Research Volume: 580 Issue: DOI: 10.4028/www.scientific.net/AMR.580.165 Published: 2012Abstract:The principle of full vibration signal acquisition system is introduced. This article through the use of PSD high resolution, the characteristics of the corresponding speed, put it to use in vibration measurement, and introduces the realization method, Including the front optical, electrical and late signal processing, And through the concrete experimental data, and verifies the feasibility of the scheme. ? (2012) Trans Tech Publications, Switzerland.Accession Number: 20124815717687 -
Record 143 of
Title:Mirror-compensation test of abaxial elliptic surface
Author(s):Li, Hongguang(1); Liu, Xiumei(2); Da, Zhengshang(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 41 Issue: 8 DOI: Published: August 2012Abstract:The usability requires that the surface PV (peak to valley)value of off-axis elliptic surface should be less than 0.4λ (λ=351 nm). According to spherical-aberration expression of the third-order aberration theory and compensation test principle, the radius expression of spherical compensator was obtained for the test optical path. Based on the known data, the initial configuration parameters of compensation optical path was solved, which was brought into software, giving fine design results. The initial results and the fine design results had no changes, and it shows that compensation optical path solve method is correct. Considering the manufacture errors of elements and the adjustment errors of test optical path, after the simulation analysis, with errors brought into the test optical path, the under-test element surface precision was gotten: when the eligibility probability was 98, the elliptic surface PV was 0.379λ (λ =351 nm). It meets the usability requirement, and it shows that the method of mirror-compensation test of off-axis elliptic surface is feasible.Accession Number: 20124415622960 -
Record 144 of
Title:Design and analysis of a novel noncollinear acousto-optic tunable filter
Author(s):Zhu, Yingying(1,2); Zhang, Chunmin(1); Zhao, Baochang(3)Source: Optics Communications Volume: 285 Issue: 9 DOI: 10.1016/j.optcom.2012.01.027 Published: May 1, 2012Abstract:The design of a noncollinear acousto-optic tunable filter (AOTF) is commonly based on parallel tangent momentum-matching condition. Previous studies have either moving parts or modulation. These approaches would obviously decrease the accuracy of an acousto-optic tunable filter (AOTF) since it will be influenced by vibration or by an extended measurement time. In this paper, we introduce a novel noncollinear acousto-optic tunable filter division-of- amplitude photopolarimeter (DOAP). It is completely characterized by a wavelength-dependent 4 × 4 matrix that can be determined directly by calibration. The instrument has neither moving parts nor modulation. Besides, this system can acquire the image, spectral and polarization information of an object simultaneously. ? 2011 Elsevier B.V. All rights reserved.Accession Number: 20121114852285