• 정보저장시스템학회논문집
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• 제10권1호
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• pp.19-22
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• 2014

Optical nonlinear property is utilized to the wave generation, generating the beam at intended wavelength, and optical computing systems. The genetic material, which is the DNA with helical structure in nano-scale, is fascinating for optics communities due to artificially controllable sequence that determines the physical and chemical property. Nonlinearity of DNA was investigated by the four wave mixing experiment, which is with two incident beams located at 1550nm and 1650nm. The four output beams including incident beams are emitted from genetic material such as 1461nm and 1763nm by nonlinear characteristic. The 1461nm beam which is generated by four wave mixing phenomena was observed by optical spectrum analyzer.

• Bulletin of the Korean Chemical Society
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• 제26권5호
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• pp.841-844
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• 2005

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.149-150
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• 2009

• 센서학회지
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• 제15권4호
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• pp.297-301
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• 2006

We have fabricated a multi-mode nonlinear plastic optical fiber (POF) using organic nonlinear optical materials and demonstrated the propagation of light. The refractive indices of core and cladding are 1.5240 and 1.5172. We made a POF preform by rod-in tube method. The core diameter of the fabricated POF is about $30{\mu}m$. We evaluated the temperature characteristics of POF. The sensitivity is $0.345{\;}mW/^{\circ}C$ and the linearity of sensor was good.

• 한국광학회지
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• 제9권3호
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• pp.168-174
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• 1998

본 연구에서는 광학매질의 비선형 특징을 측정하기 위해, 자체집속현상을 이용하는 기존의 측정법과는 다르게, 매질을 통과한 광원의 위상섭동으로 인하여 far-field에 발생한 공간적 광장도 분포를 이용하는 far-field 위상 변조량 측정법을 사용하였다. 미선형 매질을 통과한 조사과의 위상 변화가 far-field 영역에서 나타나는 겅간적 위상 변조량을 실험적으로 측정아였고, 이를 전산시\ulcorner을 통하여 비교분석하였다. 파장 616nm, 펄스폭 106ps의 분포궤한 섹소레이저(DFDL)와 파장 308nm인 DFDL의 제2고조파를 조사광으로 사용하였고, 매질 $CS_2$와 $BaF_2$의 비선형 특성을 실험적으로 측정한후 이 값을 전산시늉값과 비교하였다. 이 실험에서 파장 616nm에 대해 $CS_2$와 $BaF_2$의 비선형 굴절률 $1.2{\times}10^{-11}$ esu와 $1.0{\times}10^{-13}$ esu를 각각 얻었고, 파장 308nm에 대해 $BaF_2$의 비선형 흡수계수 $5.0{\times}10^{-11}$cm/W를 얻었다. 이들 값은 지금까지 발표된 값들과 잘 일치한다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 IUMRS-ICEM ABSTRACT BOOK
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• pp.55.4-55
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• 1998

• 한국전기전자재료학회논문지
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• 제23권6호
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• pp.491-496
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• 2010

The relaxation behavior of aligned electric dipoles in a mixed polymer of P2ANS with P(VDF-TrFE) is studied with optical second harmonic generation (SHG). In this work, a macroscopic noncentrosymmetry of the spin coated film was achieved by an electrical poling. The relaxation of induced polar order of nonlinear optic(NLO) chromophores after poling leads to an insufficient long-term stability of NLO properties. In this work, we develop a new technique to suppress such kind of dipole relaxation in a poled polymer. We found that the poled dipoles in a NLO polymer were effectively immobilized by the internal electric field created by a thermally annealed ferroelectric polymer. The long-term stability in a mixed system of NLO polymer/ferroelectric polymer was successively accomplished by a series of thermal treatments applied to the mixed polymer system at a temperature of $140^{\circ}C$ for at least 1hour after poling.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
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• pp.230-231
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• 2001

Silica glass is a core material for optical fiber in optical telecommunications, but its centrosymmetry eliminates the second order nonlinearity. But it is experimentally well known that the space charge polarization induces the Second Harmonic Generation (SHG) when a strong DC voltage is applied to silica glass for a long period time with metal blocking electrodes. In this research, a theoretical calculation of the nonlinear optical property caused by the space charge polarization is performed, and a model of a numerical analysis to predict the small change in nonlinear optical property as functions of time and space is provided.

• Journal of the Optical Society of Korea
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• 제10권4호
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• pp.188-195
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• 2006

Third harmonic generation microscopy is described in the frame work of the theory of harmonic generation with Gaussian focused beams inside a bulk material as well as at the vicinity of an interface. This model is then applied to characterize different types of materials in terms of electronic third-order susceptibility. Examples of bulk glasses, poled glasses, laser-induced modifications in glasses and nanoparticles in solution are given in order to give a survey of the broad application field of THG microscopy in material characterization.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 IUMRS-ICEM ABSTRACT BOOK
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• pp.149.1-149
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• 1998