Forewords Focus Issue of Biophotonics in Chinese Optics Letters （COL）

Photonics Technology has made a significant impact on a wide range of medical and biomedical applications.These days,it is not uncommon to find several op- tical equipments in operating rooms and medical research laboratories.This wide     

Newest SCI Impact Factor of Chinese Optics Letters （COL） is 0.804

<正>According to the latest journal citation reports (JCR) in 2009 from Information Sciences Institute of USA, the impact factor of Chinese Optics Letters (COL) in 2009 is 0.804 which ranks 39 in all of the 70     

Newest SCI Impact Factor of Chinese Optics Letters （COL） is 0.804

According to the latest journal citation reports （JCR） in 2009 from Information Sciences Institute of USA, the impact factor of Chinese Optics Letters （COL） in 2009 is 0.804 which ranks 39 in all of the 70 optical journals included by SCI （total cites J rank 36）, ranks 2 in all optical journals of Asia included by SCI （total cites rank 1）, and ranks in the top 40% of all the Chinese journals included by SCI. COL was established in 2003 and included by SCI in 2007. Based on the calculation formula of the JCR, the impact factor of COL and other relevant data are first announced by the JCR starting from 2009.     

Editorial Announcement： Withdrawal of Chinese Physics Letters 23 （2006） 1603, ＇Diffuse Backscattering Mueller Matrices Patterns from Turbid Media＇ by Zhang Lian-Shun et al.

The editorial policy of Chinese Physics Letters （CPL）, as assigned by the Chinese Physical Society, is to provide rapid publication of short reports and important research in all fields of physics. Thus, the journal provides its diverse readership with coverage of major original advances in all aspects of physics, including the newest and most important achievements of physicists throughout the world.[第一段]     

中国光学快报

Chinese Optics Letters （COL） is an international journal sponsored by the Chinese Optical Society （COS）, undertaken by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and distributed by the Optical Society of America （OSA） outside of China. It was established in January 2003, and it aims at the rapid dissemination of new, important results in all branches of optical science and technology which cover the fields of laser optics, fiber optics and optical communications, quantum optics, nonlinear optics, medical optics and biotechnology, optical materials, measurements, imaging systems, etc..     

Information for Authors

Chinese Optics Letters is a short-article journal for the rapid dissemination of new, important results in all branches of optical science and technology and related fields, published monthly by Science in China Press and distributed abroad by the Optical Society of America.     

光电领域的学术盛会第二届光子与光电子学会议（POEM2009）

由中国光学学会、华中科技大学、湖北省科学技术厅、武汉东湖新技术开发区管委会、中国国家光电子信息产业基地主办,武汉光电国家实验室（筹）承办,中华人民共和国教育部、美国激光协会、美国光学学会、《光学与光电技术》等多家单位和媒体支持的覆盖光电子领域的大规模多学科综合性国际会议——第二届光子与光电子学会议将于2009年8月8-10日在华中科技大学隆重举行。     

Propagation of light in （2＋1）-dimensional nonlinear optical media with spatially inhomogeneous nonlinearities

The （2＋1）-dimensional nonlinear SchrSdinger （NLS） equation with spatially inhomogeneous nonlinearities is investigated, which describes propagation of light in （2＋1）-dimensional nonlinear optical media with inhomogeneous nonlinearities. New types of optical modes and nonlinear effects in optical media are presented numerically. The results reveal that the regular split of beam can be obtained in （2＋1）-dimensional nonlinear optical media with inhomogeneous nonlinearities, by adjusting the guiding parameter. Furthermore, the stability of beam regular split is discussed numerically, and the results reveal that the beam regular split is stable to the finite initial perturbations.     

Spectroscopy and Optical Properties of Novel Metal（Ⅱ）-Azo Complex Films in Blue-Violet Light Region

A novel azo derivative,α-（2-azoxyisoxazole)-β-diketone derivative (ADD),and its copper (Ⅱ） and nickel （Ⅱ） complex (CuADD and NiADD) films have been prepared respectively by spin-coated method.The absorption spectra of the films on a K9 glass substrate in the 300-800 nm wavelength region have been measured.The optical constants (complex refractive index N=n iκ） and thickness of the complex films on a single-crystal silicon substrate in the 300-600nm wavelength region have been investigated on an improved rotating analyser-polariser (RAP) type of scanning ellipsometer,and the dielectric constants ε（ε=ε1 iε2),absorption coefficients α as well as reflectance R of the films were calculated.It is found that the absorption maxima of the ADD,CuADD and NiADD films are at 324nm,372nm and 385nm,respectively,and small absorption values and steep absorption band edges of the CuADD and NiADD films are observed at the 405nm side;The CuADD and NiADD films give high n values of 2.08 and 1.98,and low κ values of 0.2 and 0.28,respectively,at 405nm,and their thicknesses are in the range of 130-150nm;the high reflectivity of 58.5% and 45.5% of the CuADD and NiADD films with Ag as a reflective layer were obtained at the film thicknesses of 70 nm and 80nm respectively.These results show that the novel CuADD and NiADD films seem to be a very promising organic recording material for the next generation of high density digital versatile disc-recordable (HD-DVD-R) systems that use a high numerical aperture of 0.85 at 405nm wavelength.     

Preparation and optical properties of poly（vinylidene difluoride）/（Y0.97Eu0.03）2O3 rare-earth nanocomposite

In this letter, poly（vinylidene difluoride） （PVDF）/（Y0.97Eu0.03）2O3 rare-earth nanocomposites were prepared by a simple co-precipitation method, and their morphology, structure, and optical properties were investigated. The scanning electron microscope （SEM） images showed that the （Y0.97Eu0.03）2O3 rare- earth nanoparticles formed 50 nm - 2 μm aggregates in PVDF matrices. X-ray diffraction （XRD） curves indicated the incorporation and structure preserving of （Y0.97Eu0.03）2O3 nanoparticles in PVDF matrices. Photoluminescence （PL） spectra of the nanocomposite showed a characteristic red light emission at 612 nm, which was attributed to the intrinsic emission of （Y0.97Eu0.03）2O3 nanoparticles. Optical band gap （Eg） of the nanocomposite exhibited a decreasing trend with the increase of （Y0.97Eu0.03）2O3 content in PVDF matrices within the experimental dosage range.     

孔子（Kong Zi，公元前551-公元前479）中国教育家（Educationist，China）

孔子，名丘，字仲尼，今山东省曲阜市人。先世是贵族。幼年贫贱，学无常师，做过小吏。年50任鲁司寇，摄行相事。后与门人周游卫、陈、蔡等国，终不见用。晚年致力于教育事业，整理《诗》、《书》等典籍，删定《春秋》。传弟子3000人，著名者72人。政治上主张“正名”，认为“君君、臣臣、父父、子子”，都应名实相副。反对苛政，提出“不患寡而忠不均，不患贫而患不安”。伦理思想上宣传“仁”。     

徐光启（Xu Guang-Qi，1562-1633）中国农业家（Agriculturist，China）

徐光启，字子先，号玄扈，上海人。1604年中进士。1632年任礼部尚书、大学士。最早把欧洲数学引入中国。译著有《几何原本》、《测量异同》和《勾股义》等。平生用力最勤的是对农业和水利的研究，著有《农遗杂疏》、《农辑》、《农政全书》等。以《农政全书》影响最大，刻印后不久就流传到日本。他的翻译质量很高。译本中许多数学上的专门名词和术语，如几何、点、线、面、平行线、钝角、锐角、三角形、四边形等等，都是由徐光启首先使用而确定下来的，一直沿用到今天。     

Shanghai Center for SuperConductivity,Chinese Academy of Sciences （SC2,CAS）

Overview Shanghai Center for Sul）erConductivity, Chinese Academy of Sciences （SC2, CAS） was established in 2012 as a dedicated center of CAS, associated with SIMIT, with the goal of facilitating excellent multidisciplinary research in superconducting electronics and applications. In addition,     

贾思勰（Jia Si-Xie，5世纪末-6世纪中叶）中国农业家（Agriculturist，China）

贾思勰，山东益都（今寿光县）人，曾任高阳（今临淄县）太守，到过山西、河北、河南等地，大约在533—544年间，在总结前人经验的基础上，写成了世界上第一部农业百科全书《齐民要术》。“齐民”，意指平民百姓，“要术”指谋生方法。该书唐末时已传入日本（至今还藏有北宋最早刊印的残本）。世界上已有多种译本出版，并有不少研究此书的著作。该书共分10卷，92篇，11万余字。     

一行（Yi Xing，683-727）中国天文学家（Astronomer，China）

一行，俗姓张，名遂，魏州昌乐（今河南省南乐县）人。21岁出家为僧，先后在嵩山、天台山研究佛经和天文历算。曾翻译《大日经》等典籍，一度为密宗大师。玄宗开元五年（717年）应召到长安，后受命主持编修新历法，开元十五年编成《大衍历》。修历伊始便着手新天文仪器的制造和天文观测。与梁令瓒一起制成黄道游仪、水运浑象仪。重测150多颗恒星的位置。     

华罗庚（Hua Luo-Gen，1910-1985）中国数学家（Mathematician．China）

华罗庚，浙江省金坛县人。1929年任金坛县立中学庶务会计，开始在上海《科学》杂志上发表数学论文。1931年被熊庆来教授发现并推荐到清华大学工作。1936年赴英国剑桥大学研究深造两年。1938年任昆明西南联大教授。1946年后任美国普林斯顿数学研究所研究员，伊利诺大学教授。1950年1月回国，历任清华大学教授，中国科学院数学研究所所长、应用数学所所长、数理化学部副主任，中国科学院副院长．中国科技大学副校长。     

Optical properties of phosphate glasses co-doped with Yb~（3＋） and silver nanoparticles

We report the fabrication and spectroscopic characterization of Yb^3＋-doped phosphate glass, also containing silver nitrate. Scanning electron microscopy（SEM） provides the evidence of the formation of silver nano-particles（SNPs）, which are formed as a consequence of melting and thermal decomposition of Ag NO3. Absorption spectra of the samples in the visible-to-near-infrared spectral range reveal the presence of bands centered at 410 nm associated with the SNP-plasmon resonance, and at 976 nm due to the Yb^3＋. Under 916-nm laser-diode pumping, the effect of the SNP reflects that： i） the fluorescence in the 950-nm–1150-nm spectral range is strongly enhanced（～ 30 times）, while the fluorescence decay time associated with the ^2F5/2→^2F7/2transition of Yb^3＋ increases 25%, and ii） the basic lasing properties（saturation pumping intensity, the emission and absorption cross sections） are substantially improved.