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Acridine Yellow를 첨가한 Boric Acid Glass매질에서 축퇴4광파 혼합에 의한 위상공액파의 편광특성
유연석 청주대학교 산업과학연구소 1991 産業科學硏究 Vol.9 No.-
Acridine Yellow doped boric acid glass saturable absorber is fabricated as nonlinear media and low power optical conjugation is achived by the degenerate four-wave mixing(DFWM) experiments. Polarization properties of optical phase conjugation by DFWM have been demonstrated in this materials using a c.w. argon ion laser at wavelength 488nm. The dependence of the phase conjugated reflectivity on the intensity and wavelength of the pump beam is examined.
유연석 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.19 No.2
An optically variable film is exhibit a significant color shift with changing observation angle. Metal-dielectric multilayer thin-film structures have large color shifts with angle, high chroma and a large color gamut that make them for various application. In this work we fabricated optically variable film and analysised color shift properties by measure the reflectance spectrum.
유연석 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.20 No.2
In this work we can construct the narrow-band spectral filters based on the one-dimensional photonic crystal. One-dimensional photonic crystals is designed by using the standard multilayer filter and surface waves We analyze the transmissivity of this type filter for a range of wave lengths and incidence angles as a function of the air gap.
유연석 청주대학교 2010 産業科學硏究 Vol.28 No.1
The optical vortex beams has attracted more and more attention in recent years, because it possesses orbital angular momentum and can be used to micromanipulation of biological specimens or laser tweezers. In this work, we used to demonstrate the carrying orbital angular momentum of the vortex beam is put forward, which is based on the interference of Young's double-slit geometry. The interference pattern of the two slits depends on the helical phase structures and azimuthal order of the vortex beams. Also the sign change of the azimuthal order can be determined clearly by the interference patterns in the focus
유연석 청주대학교 2012 産業科學硏究 Vol.29 No.2
The microstructure obtained by oblique angle deposition on flat surfaces can show column like periodic structures. Controlling the column diameter and periodicity of these microstructures is an important technological issue. In this work we will present the experimental results and quantitative analysis using AFM(atomic force microscopy) measurements and PSD(power spectral density) of SiO2 microcolumns at different thickness by oblique angle physical deposition.
유연석 청주대학교 2004 産業科學硏究 Vol.22 No.1
Binocular system has a pachan prism which is provided with a piece of prism. One of them has a roof surfaces which is provided with a pair of reflection surfaces intersecting at a 90 degree. A change in the phase difference produced between roof surfaces influence the quality of an image. In this work we designed the phase correction thin film systems for improve the quality of an image to be viewed.
유연석 청주대학교 산업과학연구소 2007 産業科學硏究 Vol.24 No.2
The dynamical behavior of optical vortices with a pair of identical optical vortices as them propagate through free space is investigated. The rotation of two optical vortices with same charges are observed about the direction propagation. Observed rotation rate depends on the distance of vortex separation and core size.
유연석,김남훈 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.18 No.2
An optically variable thin film system is designed to exhibit a significant color shift with changing observation angle. This color shift is also calculated the angle dependent color performance of the optically variable films. Also in this design the shape of the reflectance curve and the degree of color shift with viewing angle for meta-dielectric films depends strongly on the dielectric layer thickness. The color difference shows by using color parameter, L^(*), a^(*), b^(*), for thickness and viewing angle.
유연석 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
High reflection or antireflection thin film structure is can be stacked on the moving substrate. The structure of substrate/multilayerl/Air gap/multilayer2 can realize an optical switch. In this work, the optical properties of the thin film structure are described.
유연석,이성훈,최한섭 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.2
The interaction of laser radiation with optical coatings is inverstigated by a cur and a pulsed two probe-beam photothermal technigue. Laser damage threshold studies on Al₂O₃, SiO₂, ZrO₂, TiO₂ single stacks are performed at λ=1 06㎛. And the absorption properties on these films are measured at cw Ar ion laser wavelength. The damage threshod of selected samples is influenced by the deposition technique