• 한국광학회지
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• 제8권6호
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• pp.492-499
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• 1997

굽은 비선형 도파로를 이용한 완전 광 스위치와 굽은 비선형 Y 분기각을 갖는 도파로를 이용한 완전 광 논리 연산소자를 제안하였다. 제안된 완전 광 스위치와 완전 광 논리 연산소자는 굽은 비선형 도파로를 따라가는 비선형파의 전파에 기초를 두고 있다. 빔의 전파특성은 도파로의 비선형성과 입력 파워, 도파로의 굽은 각도 등의 파라미터에 의해 좌우되므로 파라미터를 변화시켜 가면서 파워의 출력 특성을 계산해 보았다. 또한, 비선형 물질로 빠져 나오는 파워를 다양한 위치의 검출기에서 계산함으로써 특정한 검출기의 위치에서 가장 이상적인 디지털 스위칭 특성을 찾았고 도파로 끝과 비선형 물질로 빠져 나오는 파워의 비율에 의해 다양한 논리 함수(AND, OR, XOR)를 구현해 보았다.

• 세라미스트
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• 제10권3호
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• pp.15-27
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• 2007

Fabrication and electro-optic applications of glass optical fibers were reviewed. Theoretical description on the electro-optic Kerr effect in glass optical fibers, particularly for the second-order optical nonlinearity was given. Fabrication procedure and the characterization of the nonlinear electro-optic fibers with internal electrodes were described. Several electro-optic devices based on the polarimetric cells made by the nonlinear optical fibers with internal electrodes were also discussed with the experimental results on the electro-optic effect.

• Journal of the Optical Society of Korea
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• 제6권3호
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• pp.96-99
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• 2002

We give a brief overview of nonlinear localized modes in photonic crystals. We explain how photonic crystals can potentially be important in making small scale active devices which operate in an all optical way. Two models to approach nonlinear photonic crystals, the coupled mode theory and the discrete lattice theory using a Green's function, are explained.

• 한국세라믹학회지
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• 제34권4호
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• pp.429-435
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• 1997

The third order nonlinear optical susceptibilities, {{{{ chi }}(3), of the CuCl doped alumino-borosilicate glasses were measured by the two beam configuration DFWM method and the absorption saturation method, and the measured {{{{ chi }}(3) values were about 10-8 esu in both methods. The response time was estimated to be about 105ps from the time decay curve of the luminescence spectra obtained by time-correlated single-photon counting (TCSPC) method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.675-677
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• 2004

This paper presents a nonlinear controller design for optical disk drive systems to improve anti-shock performance. The nonlinear anti-shock controller is added parallel to the original linear servo control loop. In the previous work, dead-zone nonlinear element is used for nonlinear controller and PID control method is used for linear controller. Although this strategy improves anti-shock performance, it has a narrow stability bound. In this paper, we propose dead-zone with saturation nonlinear element for the nonlinear controller. Since this nonlinear element improves stability margin, we can use higher gain of dead-zone than the controller with dead-zone only. In the linear controller design, we show that lead-lag control has improved stability margin over PID control. Numerical simulation results show that the proposed method can get better performance to the external shock than previously proposed method.

• 한국세라믹학회지
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• 제34권4호
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• pp.420-428
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• 1997

Alumino-borosilicate glasses containing nano-sized CuCl crystals for nonlinear optical application were prepared by the melting and precipitation process, and structural and optical properties were investigated by using XRD, TEM, SAXS, and optical spectroscopy. the average radius of the precipitated CuCl particles was about 2 nm. The blue shift of Z3 resonance peak with decreasing the precipitated CuCl particles size was found and the radius increased with decreasing the glass transition temperature of the matrix glass and with increasing the temperature and duration time of the precipitation heat treatment.

• 한국광학회지
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• 제2권2호
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• pp.103-107
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• 1991

Nonlinearity of glass had not been remarkably large among all the available nonlinear materials. However, its superiority in optical and mechanical properties has attracted much attention for the practical application. To this goal the recent interests in this field have been shifting from the understanding of nonlinear mechanisms to the improvements of nonlinear properties.

• 한국광학회지
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• 제2권1호
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• pp.31-35
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• 1991

The third-order nonlinear optical susceptibilities of $\beta$-carotene, retinal and retinol have been measured using self-induced ellipse rotation and dc-Kerr effects. The strengths of $\chi$1221(-$\omega$, $\omega$, -$\omega$, $\omega$) and $\chi$1221(-$\omega$, $\omega$, 0, 0) measured by the two different methods are not different each other significantly. And it is observed that the strength of the third order nonlinear optical susceptibility is relatively insensitive to the conformational difference between retinal and retinol. It is also demonstrated that the third order nonlinear optical susceptibility of long-chained organic molecules is dependent upon the number of the double-bonds.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 하계학술발표회
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• pp.5-5
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• 2001

No Abstract.See Full-text

• 한국광학회:학술대회논문집
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• 한국광학회 2000년도 제11회 정기총회 및 00년 동계학술발표회 논문집
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• pp.160-161
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• 2000

The 3rd order nonlinear properties show Optical bleaching (Saturation) and Reverse saturation in absorption aspect, whereas Self-focusing[3][4] and Self-defocusing in refraction aspect. Optical bleaching and Self-focusing phenomena of those properties in particular can be useful to make the optical beam spot size smaller for application on the higher optical storage density. (omitted)