• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.821-823
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• 2003

We have developed the evaluation program using LabVIEW for the high power laser measurement system.

• Proceedings of the KWS Conference
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• 2002.10a
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• pp.162-168
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• 2002

Hybrid Welding means the coupling of the energy of two different energy sources in a common process zone. This paper describes prospects in laser-arc-hybrid-welding. Different kinds of lasers ($CO_2$ laser and Nd:YAG laser) and arc processes (TIG, Plasma and GMA) are considered.

• Proceedings of the Korea Association of Crystal Growth Conference
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• 1996.06a
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• pp.462-487
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• 1996

We report on the fourth and fifth harmonics generations of Nd:YAG laser radiation realized in CsLiB6O10(CLBO). The values of 500 mJ and 230 mJ at 266 nm and 213 nm were obtained from 2200 mJ of fundamental energy. Doping of CLBO has been carried out and the Al doping was found to give rise to an enhancement of mechanical and chemical properties.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2003.10a
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• pp.174-179
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• 2003

Non-destructive test on the size and depth of cracks has been required for the safety evaluation of structures. Ultrasonic method based on laser techniques is one of the most popular non-destructive methods which overwhelm PZT based tests. In the present paper, ultrasonic was generated by high powered Q switching Nd:YAG pulse laser. Experiments were carried out using Fabry-Perot interferometer which was intensively discussed in the present study.

• 한국가시화정보학회:학술대회논문집
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• 2004.11a
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• pp.108-111
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• 2004

Laser induced incandescence and laser induced fluorescence techniques have been investigated to measure the concentrations of soot and PAH, respectively. The Nd:YAG and dye lasers were used to form a sheet beam, and its wavelength were modulated to obtain a optimized signals of soot and PAH. Results showed that the relative size groups of soot and PAH can be measured by using our laser techniques.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.145-148
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• 1986

To perform the marking on metal with high speed and non-contact using the laser beam of high energy, laser marking system is designed and fabricated applying the galvanometer scanner capable of high speed-precise beam positioning controlled by microprocessor. Laser is a Q-switched Nd:YAG producing multi-mode, wavelength, 1060nm. Optical system is composed of beam expander, scanning mirror and flat field lens. Consequently, the laser marking is satisfactorily achieved regardless of kinds of metal.

• Proceedings of the Optical Society of Korea Conference
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• 1991.06a
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• pp.102-108
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• 1991

Utilizing self-phase modulation effects of a dispersion-shifted fiber and delay-line characteristics of two gratings, mode-locked 80 ps pulses at 1.319${\mu}{\textrm}{m}$ wavelength from a Nd: YAG laser are compressed down to 2.1 ps. These pulses are further compressed down to 340 fs using higher order soliton effects in a common single mode fiber.

• Proceedings of the Optical Society of Korea Conference
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• 1991.06a
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• pp.199-202
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• 1991

기체 시로의 정밀한 분석이 가능한 공명이온화 질량분석장치(Resonance lonization Mass Spectrometor)를 설계, 제작하고 그 특성을 분석하였다. 두 개의 터보펌프(turbo-molecular pump)로 차등펌핑하여 1*10-7Torr 의 진공도를 얻었으며, Nd:YAG 레이저로 광펌핑되는 색소레이저를 분자빔에 조사하여 공명다광자 이온화현상에 의해 발생되는 이온들을 가속시켜 질량을 측정하였다. 아닐린을 시료로 사용하여 분석한 결과 최대 분해능 200을 얻었다.

• Korean Journal of Optics and Photonics
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• v.6 no.1
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• pp.39-44
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• 1995

3차원 .delta.-potential을 가진 원자 모델을 이용하여 Nd:YAG(1064nm), Ti:sapphire(806nm), 색소(616nm), XeCl(308nm) 레이저를 기본파로 하고, 1차 이온화된 K/sup +/, Na/sup +/, Li/sup +/ 등의 알칼리 금속 이온을 비선형 매질로 할 때 고차고조파 분포를 수치적으로 해석하였다. 계산 결과 고차고조파 발생에서 특징적으로 나타나는 plateau는 비선형 매질의 이온화 에너지가 클수록, 기본파의 파장이 길수록 높은 차수에서 폭넓게 나타나고, 그 강도는 감소한다.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.7
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• pp.27-35
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• 2000

재료가공분야에의 레이저의 적용은 1960년대 후반부터 시작되었으며, 고출력 CO$_2$ 와 Nd:YAG 레이저가 많은 산업분야에서 보편화될 정도로 발전하여 왔다. 재료가공에서의 레이저의 적용분야는 금속의 절단, 용접 및 드릴링, 세라익의 스크라이빙, 플라스틱과 복합재의 절단 및 여러 가지 재료의 마킹 등을 포함한다. 이와 같은 모든 응용에서 공통적인 것이 레이저 조사에 의해 재료를 용융, 증발시키는 열적 메카니즘이다.(중략)