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Scratching and Turning Experiments on Machinability of optical glass SF6 in Diamond Cutting Process

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Transactions of Tianjin University 2011年第4期17卷 280-283页

作者：贾鹏周明 School of Mechanical and Electrical Engineering Harbin Institute of Technology

To improve the machinability of optical glass and achieve optical parts with satisfied surface quality and dimensional accuracy, scratching experiments with increasing cutting depth were conducted on glass SF6 to evaluate the influence of cutting fluid properties on the machinability of glass. The sodium carbonate solution of 10.5% concentration was chosen as cutting fluid. Then the critical depths in scratching experiments with and without cutting fluid were examined. Based on this, turning experiments were carried out, and the surface quality of SF6 was assessed. Compared with the process of dry cutting, the main indexes of surface roughness decrease by over 70% totally. Experimental results indicated that the machinability of glass SF6 can be improved by using the sodium carbonate solution as cutting fluid.

关键词： diamond cutting optical glass machinability scratching experiment cutting fluid

Analytical Study of Precision optical glass Surface and Its Effect on Some Polarimetric Parameters

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Journal of Surface Engineered Materials and Advanced Technology 2022年第1期12卷 14-21页

作者： Naglaa Aboe-Ella Mahmoud Length and Engineering Precision National Institute for Standards (NIS) Giza Egypt

The performance of many optical glass elements depends on the structure of the surface. The high refractive index of flint glass is advantageous in constructing some optical elements (lenses, prisms, beam splitters, …). Also, high achromaticity and size reduction in oblique incidence TIR (total internal reflection) phase retarders require high-index glass. The present work is interested in studying the optical properties of the thin surface layer formed on TIR rhomb retarder at different wavelengths to indicate the extent to which this surface layer affects the performance of this TIR rhomb retarder and show how to overcome this effect.

关键词： optical glass Ellipsometry Oblique Incidence Retarder Surface Layer and Retardance

Evaluation of Correction Algorithm for the Reflectance Measured with optical glass

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维普期刊数据库

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Journal of Donghua University(English Edition) 2003年第2期20卷 52-55页

作者：车江宁周志华陈东辉 School of Graduate Donghua University Shanghai 200051 School of Graduate Donghua University Shanghai 200051he proposed algorithm for reflectance measured with optical glass has been verified with materials of various forms. The reflectances measured with optical glass ( raw) without glass (true) and corrected by the algorithm are compared. The results show that the corrected reflectance agrees very well with true one and their color differences fall below the acceptable limit which indicates the validity of the correction algorithm. The algorithm could be used not only for fiber-forming materials but also for powder-forming granulate-forming etc.

The proposed algorithm for reflectance measured with optical glass has been verified with materials of various forms. The reflectances measured with optical glass ( raw), without glass (true) and corrected by the algorithm are compared. The results show that the corrected reflectance agrees very well with true one and their color differences fall below the acceptable limit, which indicates the validity of the correction algorithm. The algorithm could be used not only for fiber-forming materials, but also for powder-forming, granulate-forming, etc.

关键词： Correction Algorithm Reflectance optical glass

Factors of Influencing on Material Removal Rate of optical glass Surface Polished by Ceria

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Factors of Influencing on Material Removal Rate of Optical G...

Properties of steady-state in Er^(3+)-Yb^(3+)co-doped phosphate glass for optical waveguide laser

第七届国际粉体检测与控制学术会议

作者： Hu Pinggui Yu zhiren Li Yingyi Gu Ziying Li Yongxiu Research center for Rare earths & micro-nano functional materials,Nanchang University,330047,China

Removal rate is an important parameter of evaluating polishing property of a *** this paper,the effects of some factors,such as the calcining temperature of ceria,slurry concentration and polishing temperature,on the materi- al removal rate of ZF6-type optical glass were *** was found that the material removal rate increased with the increase of ceria concentration in slurry and the temperature at which ceria was *** optimal calcining tempera- ture was at around 1000℃,and the suitable concentration was of 2%.The fact that the material removal rate decreased with the increase of polishing temperature indicated that the effect of polishing temperature on the surface friction force was more then that on the chemical reaction.

关键词： CMP Ceria Reraoval rate optical glass

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cnki会议

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Chinese Optics Letters 2007年第7期5卷 418-421页

作者：刘玉喜张晓霞李瑛庞莹 School of Optic-Electronic Information University of Electronic Science and Technology of China Chengdu 610054 School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu 610054

Transitions of laser diode （LD） pumped Er^3＋-yb^3＋ co-doped glass laser are rather complicated. Considering energy transfer between Er^3＋ and Yb^3＋ ions, cross-relaxation, upconversion luminescence, and other transition processes, rate equations of quasi-three energy-level-system of the Er^3＋-yb^3＋ co-doped laser are presented. The output characteristics are also calculated and analyzed in detail. The results show that Er^3＋-yb^3＋ co-doped phosphate waveguide lasers with high slope efficiency and low threshold can be achieved.

关键词： Electron energy levels Energy transfer Luminescence optical glass optical waveguides Phosphates Rare earth additions Semiconductor lasers

Ultra-precision figuring using submerged jet polishing

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Chinese Optics Letters 2011年第9期9卷 64-66页

作者：施春燕袁家虎伍凡万勇建 Institute of Optics and Electronics Chinese Academy of Sciences

A new removal optimization method called submerged jet polishing （SJP） is reported. Experiments are conducted to obtain the removal shape. Results of SJP indicate that a Gaussian shape removal function can be obtained and that the removal rate is sensitive to variations in the standoff distance. SJP is applied to the corrective figuring of a BK7 optical glass. The flatness is improved from photovolatic （PV） 0.066 λ to 0.024 ）, （λ = 632.8 nm） after three iterations, and the root mean square （RMS） value is improved from 0.013 λ to 0.00395 λ. The experimental result indicates that SJP has a capability for ultra-precision figuring and can be applied in polishing complex-shaped surfaces.

关键词： optical glass

Polarization-dependent characteristics of a racetrack waveguide resonator fabricated by ion exchange in K9 glass

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Chinese Optics Letters 2006年第7期4卷 393-396页

作者：韩秀友刘峰庞拂飞初凤红蔡海文瞿荣辉方祖捷 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

A racetrack waveguide resonator filter was fabricated by ion exchange technology in K9 optical glass. The filter responses of the waveguide resonator were measured with two polarized input lightwaves. The polarization-dependent characteristics of the waveguide resonator were analyzed, and the results of effective indices of nTE=1.5721 and nTM = 1.5548, coupling ratios of rTE = 0.731 and rTM = 0.761, and losses of αTE = 4.35 dB/cm and αTM = 6.05 dB/cm were obtained for transverse electric （TE） and transverse magnetic （TM） modes, respectively. The causes of large loss and effective index differences between TE and TM modes were discussed.

关键词： Couplings Ion exchange optical filters optical glass Polarization Waveguides

Numerical calculation of Kerr spectra for Co/Pt magnetic multilayered films

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Chinese Optics Letters 2003年第8期1卷 491-493页

作者：林应斌黄志高都有为 Department of Physics Fujian Normal University Fuzhou 350007 Department of Physics Fujian Normal University Fuzhou 350007 National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093

The Kerr spectra as function of wavelength, incident angle and layer number are calculated with 4×4 matrix method. It is found that the calculated results are in good agreement with experimental ones for [Co (0.3 nm)/Pt (0.4 nm)]×43/glass (1.21 mm) and [Co (0.4 nm)/Pt (1.1 nm)]×53/glass (1 mm). In addition, for [Co (0.3 nm)/Pt (0.4 nm)]×43/glass (1.21 mm), it shows a maximum Kerr rotation at N=10. For [Co (0.4 nm)/Pt (1.1 nm)]×53/glass (1 mm), the calculated Kerr rotation as a function of incident angle reveals maximum when the incident angle is 89°.

关键词： Cobalt Numerical methods optical glass optical Kerr effect Platinum

Enhanced emission at 2.85 μm of Ho^(3+)/Pr^(3+) co-doped α-Na YF_4 single crystal

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Optoelectronics Letters 2016年第1期12卷 56-60页

作者：王成夏海平冯治刚张志雄江东升张健盛启国汤庆阳何仕楠江浩川陈宝玖 Key Laboratory of Photoelectronic Materials Ningbo University Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Department of Physics Dalian Maritime University

The Ho^(3+)/Pr^(3+) co-doped Na YF4 single crystals with various Pr^(3+) concentrations and constant Ho^(3+) molar percentage of ~1% were grown by an improved Bridgman *** with the Ho^(3+) single-doped Na YF4 crystal,an obviously enhanced emission band at 2.85 μm is observed under 640 nm *** Judd-Ofelt strength parameters(?2,?4 and ?6) are calculated,the radiative transition probabilities(A),the fluorescence branching ratios(β) and the radiative lifetime(τrad) are obtained in the *** energy transfer from Pr^(3+) to Ho^(3+) and the optimum fluorescence emission of Ho^(3+) ions around 2.85 μm are ***,the maximum emission cross section of above samples at 2.85 μm is calculated to be 0.72×10^(-20) cm2 for the Na YF4 single crystal with Ho^(3+) molar percentage of 1% and Pr^(3+) molar percentage of 0.5% according to the measured absorption *** results suggest that the Ho^(3+)/Pr^(3+) co-doped Na YF4 single crystal may have potential applications in mid-infrared lasers.

关键词： Absorption spectroscopy Crystal growth from melt Energy transfer Fluorescence optical glass