• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.44-45
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• 2001

실리카 마이크로 스피어는 손실이 대단히 적은 초고품위 공진기로 알려져 있다. 최근의 실험들에 의하면 실리카 마이크로 스피어는 공진기 Q 값이 $10^{9-10}$ 정도인데, 이는 현재까지 만들어진 마이크로 공진기들 중에서 가장 높은 값이다. 최근 마이크로 스피어는 저손실의 공진기로서 문턱조건이 없는 레이저 연구에 활용되고 있으며, 레이저와 좁은 공명 모드 선폭을 이용하여 레이저 주파수 안정화 및 광섬유 결합기 등에 활용되고 있다. 또한 Cavity-QED 연구와 Cavity-QED 효과를 이용한 소수의 양자점 레어저 연구에도 활용도고 있다. (중략)략)

• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.252-253
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• 2001

The purpose of this work is to investigate the dynamics of an atomic wave packet whose center-of-mass motion is quantized in a resonant standing wave cavity field. The mechanical aspect of the matter-field interaction has been extensively studied In the theme of atomic beam deflection, diffraction, or reflection by a standing-wave field. The effect caused in the behavior of spontaneous emission by the atomic center-of-mass motion, classical and quantized, in a standing wave cavity mode has been studied, and recently the one-atom laser with quantized atomic center-of-mass motion has been investigated. (omitted)

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.216-217
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• 2000

상자성을 갖는 분자에 대한 분광학 연구에서는 제만(Zeeman) 효과로 생기는 이색성을 이용한 magnetic rotation spectroscopy (MRS)가 널리 사용되고 있다.$^{(1)}$ MRS가 일반적인 흡수 분광법에 비해 더 민감한 측정을 할 수 있기는 하지만 사용하는 편광기의 extinction ratio에 의해 감도가 한정된다. MRS의 감도를 높이는 방법으로는 광경로를 길게 만드는 것을 고려할 수 있다. 일반적으로 공진기 광자감쇠 분광학(Cavity Ring-Down Spectroscopy, CRDS)은$^{(2)}$ 높은 반사율을 갖는 거울을 사용해서 수 km 이상의 광 경로를 만들기 때문에 감도가 높다. (중략)

• Journal of the Optical Society of Korea
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• v.5 no.3
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• pp.67-69
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• 2001

An alternative way to determine the birefringence for uniaxial crystals with Brillouin scattering experiments equipped with a Fabry-Perot interferometer is presented. The value of the minimum cavity spacing of the interferometer to observe the birefringence was found, and it is shown that the experimental error of the birefringence could be reduced by increasing the cavity spacing. For a single crystal of $\alpha$-LiIO$_3$, the birefringence was found to be 0.14814$\pm$0.0007 at 514.5 nm.

• Korean Journal of Optics and Photonics
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• v.15 no.6
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• pp.495-502
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• 2004

We proposed an analysis model for a Fabry-Perot cavity constructed with a plane-mirrored optical fiber and a concave-mirrored one. We presented the analysis results calculated by inserting practical values into the equations derived. The coupling loss of the cavity and the mirror loss are the most important parameters in reducing the insertion loss of the filter. In order to build a filter of finesse 600, FSR 57 nm, and insertion loss < 3 dB, the plane-concave cavity using mirrors of loss < 0.09% should be aligned for the coupling loss to be less than 0.1 %.

• ETRI Journal
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• v.30 no.6
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• pp.833-843
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• 2008

The effect of forward and reverse electrostatic discharge (ESD) on the electro-optical characteristics of oxide vertical-cavity surface-emitting lasers is investigated using a human body model for the purpose of understanding degradation behavior. Forward ESD-induced degradation is complicated, showing three degradation phases depending on ESD voltage, while reverse ESD-induced degradation is relatively simple, exhibiting two phases of degradation divided by a sudden distinctive change in electro-optical characteristics. We demonstrate that the increase in the threshold current is mainly due to the increase in leakage current, nonradiative recombination current, and optical loss. The decrease in the slope efficiency is mainly due to the increase in optical loss.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.840-843
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• 2004

UV molding is a process for integrating micro/nano polymeric optical components on optoelectronic modules. In the present study, a microlens array for vertical cavity surface emitting laser(VCSEL) to fiber coupling was designed, integrated and tested. At the design stage, design variables ware optimized to maximize the coupling efficiency, and tolerance analysis was carried out. At the integration stage, the UV transparent mold was fabricated and the microlens array on VCSEL array was integrated by UV molding process. Finally the coupling efficiency of VCSEL to fiber was measured and analyzed.

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.439-440
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 1998.08a
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• pp.74-75
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• 1998

• Proceedings of the Optical Society of Korea Conference
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• 1998.08a
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• pp.188-189
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• 1998