• Proceedings of the Optical Society of Korea Conference
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• 2001.08a
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• pp.176-176
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• 2001

• Proceedings of the Korean Magnestics Society Conference
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• 2001.04a
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• pp.62-63
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• 2001

• Journal of the Korean Chemical Society
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• v.55 no.1
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• pp.141-146
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• 2011

• Journal of the Korean Chemical Society
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• v.53 no.3
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• pp.391-394
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.505-506
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• 2006

• Proceedings of the Korean Magnestics Society Conference
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• 2000.09a
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• pp.516-517
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• 2000

• Journal of the Optical Society of Korea
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• v.7 no.3
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• pp.193-196
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• 2003

We have developed a laser welding monitoring system to monitor laser welding process conditions such as sample feed rate, laser focal position, and laser power. A 2 ㎾ Nd:YAG CW laser beam has been applied to the welding of a stainless steel plate (SUS306) to investigate the welding monitoring. Theradiation signal from the weld pool was guided back through the focusing optics and the laser delivery fiber, and measured by a photo detector. By changing the focus of the laser beam along the z-direction, the penetration depth of the welding material has been measured. That shows the penetration depth depends on the frequency fluctuations of the plume signals which can be used in welding quality control.

• Journal of the Optical Society of Korea
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• v.7 no.3
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• pp.139-144
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• 2003

We have characterized the optical parametric chirped-pulse amplification of femtosecond Ti:sapphire laser pulses by using a BBO crystal. It is numerically verified that a high gain and a broad gain bandwidth can be obtained with a 532-nm pump laser. The dependence of the gain profile of OPA on phase matching angles, pump intensity, and crystal length is numerically investigated. Experimental results shows that the temporal fluctuation of a pump laser causes the modulation of an amplified spectrum in OPCPA.

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.186.2-186.2
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• 2007

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.203-207
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• 2002

In this study, by using the eye model of NAVARRO, KOOIJMAN, MAHKICHOONG, the properties of optical system are reserched in a finite ray tracing method, when ametropia is corrected by glasses or contact lens, this study is useful as a reference. Also, when Auto-refractometer for refraction test and Keratomeler are designed, these eye models can be used.