• Proceedings of the Korean Society of Laser Processing Conference
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• 2006.06a
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• pp.56-59
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• 2006

• Proceedings of the Korean Society of Laser Processing Conference
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• 2005.11a
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• pp.42-45
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• 2005

• Proceedings of the Korean Society of Laser Processing Conference
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• 2004.10a
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• pp.78-81
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 1988.06a
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• pp.1-8
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• 1988

상용 가공용 Nd:YAG 레이저의 특성 및 제원 을 분석하고 설계 시 고려하여야 할 thermal lensing 효과의 영향에 따른 출력특성의 제한에 대하여 기술하였으며 이를 토대로 200W급의 Nd:YAG 레이저를 설계하였다.

• Korean Journal of Optics and Photonics
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• v.14 no.5
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• pp.515-520
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• 2003

Characteristics of an amplifier with repetition rate of a few KHz is investigated. The continuous flash lamp pumped Nd:YAG laser head is used as an amplifier. The thermally induced birefringence of the laser medium is compensated and the depolarization is reduced to 5% in a double-pass amplifier. The amplification factor of a four pass amplifier reaches to about 3.2 at the repetition rate 5-10 KHz and the pulse width is lengthened from 40 ns to 48 ns.

• Proceedings of the KWS Conference
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• v.43
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• pp.73-75
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• 2004

The purpose of this study is to optimize Nd:YAG laser welding parameters to seaz a Rf source into a Ti micro capsule. Ti tube ends can be sealed as some length of ぉbe end is melted and coalesced. The exact control of the melted length is the most important to get sound sealing. The Nozzle type, tube rotating speed, tilt angle, focal position, pumping voltage, pulse frequency and pulse width were selected as the Nd:YAG laser welding Parameters. These Parameters were optimized by the Taguchi experimental method using 115 orthogonal array. Appearance and cross section of the seated tube ends were examined by SEM.

• Korean Journal of Optics and Photonics
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• v.5 no.1
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• pp.60-66
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• 1994

First, the beam waist size of TE$M_{00}$ Nd:YAG laser mode with Positive Branch Unstable Resonator was calculated. and then, the output power, fundamental mode and multimode beam quality factor of PBUR were measured and compared with thouse of reference resonator with plane pallalel mirrors. In characterizing the beam quality, the $M^2$ concept was used. The focusability of laser beam in unstable resonators was discussed with this $M^2$.

• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1696-1698
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• 1998

Pulsed Nd:YAG laser using Nd:YAG crystal operates stably in the thermal conductivity, mechanical, optical condition. That is used broadly in material processings because of easy reaction to the materials, and the maintenance is very easy because of lamp excitation. In these material processings, power dinsity control is very important to improve processing technology. Power density is controled by inductance and capacitance or repetition rate. Therefore we are going to control laser power density as One-Chip Microprocessor(PIC16C55) and 8051. We have been experimented at the pulse repetition rate range of 10pps to 60pps(pulse per second).

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1864-1866
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• 1997

In this study, we designed the pulse superposition network consisting of a six-mesh and a three-mesh network, and fabricated the electrical power supply and the single elliptical resonator. We have developed a tec.bnique forming the step-pulse shape of pulsed Nd:YAG laser by using one shot multivibrater and have studied on the effect of two pulses superposition for the output and efficiency improvement of pulsed Nd:YAG laser by superposing a sinusoidal pulse on a main pulse.

• Korean Journal of Optics and Photonics
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• v.1 no.2
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• pp.204-209
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• 1990

The temperature variation at a laser rod center induced by high repetetion rate pumping was measured by counting the number of inteference frigne shift and found to be consistent with the theoretical value obtained from heat diffusion equation. The spatial homogeneity and energy transfer rate of flashlamp pumping by the single elliptical reflector plated with gold were evaluated by measuring interference fringes oever the cross section of a Nd:YAG laser rod.