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Optical Engineering

Active two-pulse superposition technique of a pulsed Nd:YAG laser
Author(s): HeeJe Kim; Jong-Han Joung; Dong-Hoon Lee; Dong-Hyun C. Kim
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Paper Abstract

In manufacturing processes, various and suitable pulse shapes are required for the purpose of materials processing, and the pulse shape is regarded as a dominant factor according to the specific property of materials. Therefore, this study has undertaken to generate the correct ones by using the two-pulse superposition technique. The pulsed Nd:YAG laser using a multi-mesh inductor L and capacitor C network and the pulse superposition technique is described. We have tried to superpose two pulses with the single shot multivibrator (SSM: 74LS123) having two silicon-controlled rectifiers (SCRs) which control the delay time of the two gate turn-on signals. One is a main rectangular pulse, and the other is a superposed sinusoidal pulse. The use of this technique might impart a number of advantages to people who need a suitable pulse shape for particular applications such as welding, cutting, and drilling. In addition, we compared the case of no superposition and applied input energy of 100 J in only the main circuit with that of superposition and applied input energy of 75 J in the main circuit and 25 J in the superposing circuit. It is found that the maximum efficiency of 4.5% is obtained within the range of delay time less than 230 µs by adjusting the delay time from 0 to 1 ms.

Paper Details

Date Published: 1 June 1998
PDF: 5 pages
Opt. Eng. 37(6) doi: 10.1117/1.601729
Published in: Optical Engineering Volume 37, Issue 6
Show Author Affiliations
HeeJe Kim, Pusan National University (South Korea)
Jong-Han Joung, Pusan National Univ. (South Korea)
Dong-Hoon Lee, Pusan National Univ. (Japan)
Dong-Hyun C. Kim, Pusan National University (United States)

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