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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,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 청주대학교 2004 産業科學硏究 Vol.22 No.1
Image camera of the personal computer can be used for medical. The optic system for transmisstion of image was consisted of object lens and relay lens system. Design and analysis used zemax optical design program. In this paper, studied on the camscope to use by medical.
다층구조를 갖는 다공성 실리콘의 발광 특성에 관한 연구
유연석,오세권 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.24 No.1
In this study, various kinds of p-type porous silicon were prepared, changing the current density and the anoxic oxidation time, with p-type single crystalline Si substrate of resistivily 10-15Ω·cm in the HF-ethanol solution of each different concentration of HF. The porosity, thickness, refractive index of these prepared porous silicon were measured and calculated. We obtained porous silicon multi-layers which had periodically varying refractive index by the current density. We fabricated multi-layered porous silicon and porous silicon micro-cavity which consist of porous silicon multi-layers(I), active layer of porous silicon, and porous silicon multi -layors(II) and investigated its physical properties and optical properties.
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
유연석 청주대학교 2011 産業科學硏究 Vol.29 No.1
In this work, demonstrate an efficient method for measuring the orbital angular momentum of optical vortices. This method, based on a multipinhole interferometer and phase extracting from the Fourier transform of a multipinhole diffraction intensity pattern with a simple image processing. Using this method the optical angular momentum of the photon can be measured quantitatively.
유연석 청주대학교 산업과학연구소 2008 産業科學硏究 Vol.25 No.2
Optical vortex were created using gaussian beam containing a pair of off-axis screw dislocation propagated through a dye-doped nonlinear medium. We have observed an enhancement of fluid like rotation of a pair of identical optical vortices as they propagate through nonlinear refractive medium. We measured this effect to be 2 times larger than in linear media. The vortex rotation angles that exceed the Gouy phase limit.
유연석 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.20 No.1
In this work show the structure of an all-dielectric omnidirectional mirror for visible bands. Periodic structure are designed using Na_(3)AlF_(6)/ZnS and MgF_(2)/ZnS multilayer structure developed by means of standard design technology. Designed structure was found to exhibit reflection coefficient more than 95% in the range of incident angles from 0° to 70° at the bothe polarization of visible spectrum.
유연석 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2
The reflectance and transmittance of dielectric thin films at oblique angles of incidence have strong polarization effects. Inthis study, sone desigen methods are introduced, and proposed the non polarizing beam splitter using. the S₁ included three layers structures. A few examples are elaborated where these values are designed and optimized to give R_(p)= R_(s)=30±5% in the vicinity of λ_(0)