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Optical constants of aluminum films prepared by electron beam evaporation

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Chinese Optics Letters 2013年第13期11卷 87-89页

作者：姜承慧刘华松刘丹丹 tianjin Key Laboratory of Optical Thin Films Tianjin Jinhang Institute of Technical Physics Tianjin 300192 China

The metal aluminum （Al） is widely used because it has high reflectivity from the ultraviolet to the infrared band. But the new deposited Al films is exposed to the atmosphere, it forms transparent Al2O3 films on its surface at once. In this letter, the Al films is deposited on the quartz substrate by electron beam evaporation. The effect of Al films oxidation on refractive index and extinction coefficient is investigated by spectroscopic ellipsometry （SE）. The optical constants of Al films change with the increase of oxidation time. The two parameters become stable when these films are exposed in air more than 2 days.

关键词： Optical constants

Laser-induced collisional energy transfer in Sr-Li system

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Chinese physics B 2012年第8期21卷 167-172页

作者：陈德应鲁振中樊荣伟夏元钦周志刚季一勤 National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology tianjin Key Laboratory of Optical Thin Films Tianjin Jinhang Institute of Technical Physics

A four-state model considering the relative velocity distribution function for calculating the cross section of laserinduced collisional energy transfer in a Sr Li system is presented and profiles of laser-induced collision cross section are obtained. The resulting spectra obtained from different intermediate states are strongly asymmetrical in an opposite asymmetry. Both of the two intermediate states have contributions to the final state, and none of the intermediate states should be neglected. The peak of the laser-induced collisional energy transfer （LICET） profile shifts toward the red and the FWHM becomes narrower obviously with laser field intensity increasing. A cross section of 1.2 × 10^-12 cm2 at a laser field intensity of 2.17 ×107 V/m is obtained, which indicates that this collision process can be an effective way to transfer energy selectively from a storage state to a target state. The existence of saturation for cross section with the increase of the laser intensity shows that the high-intensity redistribution of transition probabilities is an important feature of this process, which is not accounted for in a two-state treatment.

关键词： laser-induced collisional energy transfer collision cross section Sr-Li system

Detection of subsurface defects of fused silica optics by confocal scattering microscopy

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Chinese Optics Letters 2010年第3期8卷 296-299页

作者：马彬沈正祥贺鹏飞季一勤桑田刘华松刘丹丹王占山 institute of Precision Optical EngineeringTongji University School of Aerospace Engineering and Applied Mechanics Tongji University tianjin Key Laboratory of Optical Thin Films Tianjin Jinhang Institute of Technical Physics School of Aerospace Engineering and Applied MechanicsTongji University tianjin Key Laboratory of Optical Thin Filmstianjin jinhang institute of technical physics Department of physics Qiannan Normal College for Nationalities

A non-destructive technique for subsurface measurements is proposed by combining light scattering method with laser confocal scanning tomography. The depth and distribution of subsurface defect layers are represented in term of scattered light intensity pattern, and three types of fused silica specimens are fabricated by different grinding and polishing processes to verify the validity and effectiveness. By using the direct measurement method with such technique, micron-scale cracks and scratches can be easily distinguished, and the instructional subsurface defect depths of 55, 15, and 4 μm are given in real time allowing for an in-process observation and detection.

关键词： Crack detection Defects Grinding (machining) Light Light scattering Scattering Silica Tomography

Effects of the ion-beam voltage on the properties of the diamond-like carbon thin film prepared by ion-beam sputtering deposition

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Chinese physics B 2015年第6期24卷 581-585页

作者：孙鹏胡明张锋季一勤刘华松刘丹丹冷健 School of Electronic Information Engineering Tianjin University tianjin Key Laboratory of Optical Thin Film Tianjin Jinhang Institute of Technical PhysicsHIWING Technology Academy of CASIC

Diamond-like carbon （DLC） thin film is one of the most widely used optical thin films. The fraction of chemical bondings has a great influence on the properties of the DLC film. In this work, DLC thin films are prepared by ion-beam sputtering deposition in Ar and CH4 mixtures with graphite as the target. The influences of the ion-beam voltage on the surface morphology, chemical structure, mechanical and infrared optical properties of the DLC films are investigated by atomic force microscopy （AFM）, Raman spectroscopy, nanoindentation, and Fourier transform infrared （FTIR） spec- troscopy, respectively. The results show that the surface of the film is uniform and smooth. The film contains sp2 and sp3 hybridized carbon bondings. The film prepared by lower ion beam voltage has a higher sp3 bonding content. It is found that the hardness of DLC films increases with reducing ion-beam voltage, which can be attributed to an increase in the fraction of sp3 carbon bondings in the DLC film. The optical constants can be obtained by the whole infrared optical spectrum fitting with the transmittance spectrum. The refractive index increases with the decrease of the ion-beam voltage, while the extinction coefficient decreases.

关键词： DLC thin film ion-beam sputtering deposition chemical bondings infrared optical and mechani-cal properties

Broadening of Non-Transmission Band of Ultra-Narrow Band-Pass Filters Using Heterostructures

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Chinese physics Letters 2008年第6期25卷 2030-2032页

作者：王利王占山桑田吴永刚陈玲燕刘华松季一勤 institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 200092 tianjin jinhang institute of Technology physics Tianjin 300192

Transmission characteristics are studied for the hybrid structures combining defect and multiple heterostructures. It is shown that the non-transmission frequency range can be substantially enlarged and the phenomenon of narrow band-pass filter can be realized by adjusting the number, position and size of the defect. The theoretical and experimental results on heterostructures containing Ta2O5/SiO2 multilayer films are presented. With perfect non-transmission frequency range and high peak transmissivity, this structure opens a promising way to fabricate ultra-narrow band-pass filters with wide non-transmission frequency range.

关键词： PHOTONIC CRYSTALS FREQUENCY-RANGE PROPAGATION ENLARGEMENT MODES

The effect of phase fluctuation and beam splitter fluctuation on two-photon quantum random walk

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Chinese physics B 2020年第2期29卷 159-164页

作者： Zijing Zhang Feng Wang Jie Song Yuan Zhao Department of physics Harbin Institute of TechnologyHarbin 150001China tianjin jinhang institute of Physical Technique Tianjin 300192China

In the optical quantum random walk system,phase nuctuation and Deam splitter uuctuation are two unavoldable decoherence *** two factors degrade the performance of quantum random walk by destroying coherence,and even degrade it into a classical *** propose a scheme for the simulation of quantum random walk using phase shifters,tunable beam splitters,and *** proposed scheme enables us to analyze the effect of phase fluctuation and beam splitter fluctuation on two-photon quantum random ***,it is helpful to guide the control of phase fluctuation and beam snlitter fluctuation in the exneriment.

关键词： quantum random walk decoherence random walk

Enhanced laser characteristics of pyrromethene 650 using modified PMMA as solid hosts

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Chinese physics B 2011年第8期20卷 227-231页

作者：樊荣伟姜玉刚夏元钦陈德应 National Key Laboratory of Science and Technology on Tunable Laser Institute of optical-electronicsHarbin Institute of Technology tianjin Key Laboratory of Optical Thin Films Tianjin Jinhang Institute of Technical Physics

Solid-state samples based on modified polymethyl methacrylate （MPMMA） with methanol doped with the dye pyrromethene 650 （PM650） axe prepared. The effects of a volume percentage of methanol on the laser characteristics of the sample, including spectra properties, slope efficiency, photostability and tunable properties, are investigated. The broadband dye laser output wavelength is around 655 nm and a highest slope efficiency of 32.23% is achieved. Pumping the samples at a repetition rate of 5 Hz with a pulse energy of as high as 100 mJ （the fluence is 0.26 J/cm2）, the longest lifetime （168000 shots） is obtained in the sample （MMA：methanol=18：2）, and the corresponding normalized photostability reaches 109.19 GJ/mol. When the sample （MMA：methanol=18：2） is placed in a Shoshan-type oscilla- tor, the naxrow-linewidth operation is a continuous tuning range （up to 64 nm）. The results indicate that the laser characteristics of solid-state dyes can be greatly enhanced by using modified PMMA with methanol serving as the solid host.

关键词： solid-state dye laser modified polymethyl methacrylate pyrromethene 650 photosta-bility tunable properties

Microstructure and optical properties of Ge films prepared by ion beam assisted deposition

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Chinese Optics Letters 2013年第13期11卷 96-99页

作者：冷健季一勤赵利刘华松刘丹丹姜承慧 Department of physics and Surface physics National Key Laboratory Fudan University Shanghai 200433 China tianjin Key Laboratory of Optical Thin Films Tianjin Jinhang Institute of Technical Physics Tianjin 300192 China

Germanium （Ge） films are prepared on BK7 glass and multispectral zinc sulfide （m-ZnS） substrates by ion beam assisted deposition （IBAD）. The effects of substrate temperature, deposition rate, and ion energy on the microstructure and optical properties of the films are investigated. It can be concluded that Ge film deposited with higher rate or ion energy has more optical absorption, while ion energy below 150 eV helps to reduce film absorption. Film refractive index increases with film deposition rate and bombardment ion energy while it is below 300 eV. And higher growth rate or bombardment ion energy can weaken film diffraction intensity.

关键词： Light absorption

Optical design of common-aperture multispectral and polarization optical imaging system with wide field of view

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Chinese physics B 2019年第8期28卷 119-123页

作者： Xin Liu Jun Chang Shuai Feng Yu Mu Xia Wang Zhao-Peng Xu School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China tianjin jinhang institute of technical physics Tianjin 300192China China Centre for Resources Satellite Data and Application Beijing 100191China

Multispectral and polarization cameras that can simultaneously acquire the spatial,spectral,and polarization characteristics of an object have considerable potential applications in target detection,biomedical imaging,and remote *** this work,we develop a common-aperture optical system that can capture multispectral and polarization *** off-axis three-mirror optical system is mounted on the front end of the proposed system and used as a common-aperture telescope in the visible light(400 nm-750 nm)and long-wave infrared(LWIR,8μm-12μm)*** system can maintain a wide field of view(4.5°)and it can demonstrate an enhanced identification *** off-axis three-mirror system gets rid of central obscuration while further yielding stable system resolution and *** that has passed through the front-end common-aperture reflection system is divided into the visible light and LWIR waveband by a *** two wavebands then converge on two detectors through two groups of *** simulation results indicate that the proposed system can obtain clear images in each waveband to meet the diverse imaging requirements.

关键词： optical design common-aperture multispectral imaging polarization imaging