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Lasing Characteristics of a LED-Pumped Nd:KGW Laser
New Phys.: Sae Mulli 2018; 68: 477~485
Published online April 30, 2018;
© 2018 New Physics: Sae Mulli.

Chihyun JUNG1, Jonghoon YI*1, Beomjun LEE2, Sanghoo LEE2, Jeongseop LIM2, Woyul JUNG2, Kukhyeon KIM2

1 Department of Physics, Yeungnam University, Gyeongsan 38541, Korea
2 Deagu Science High School, Deagu 42110, Korea
Correspondence to:
Received December 15, 2017; Revised March 22, 2018; Accepted March 28, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Solid-state lasers were pumped with LEDs (light-emitting diodes) to replace solid-state lasers that are pumped with quasi–continuous-wave (QCW) laser diodes (LD). The LED has a low cost, is easy to operate in the pulse mode, has a wide emission linewidth. Nd:KGW crystals are suitable for pumping by LEDs because the width of the absorption line is very broad. For the structure pumped by an LED on four sides of the Nd:KGW crystal, the distribution of the absorbed pump light was calculated by using ZEMAX. The pump light from the LED is sent directly to the crystal or through the light guide prism to the crystal. The laser output energy versus pump energy was investigated using the calculated results for the distribution of the absorbed pump light. The Nd:KGW crystal has a lower induced-emission cross-section and a shorter fluorescence lifetime than the Nd:YAG crystal, so the lasing threshold is high. However, we found that the energy conversion efficiency of the Nd:KGW laser could be made to be higher than that of the Nd:YAG laser by increasing the overlap with the absorption spectrum when pumping with a LED having a wide emission spectrum.
PACS numbers: 42.55.Xi, 42.60.-v, 42.60.Da
Keywords: Light-emitting diode (LED), LED-pumped laser, Nd:KGW, Solid-state laser

April 2018, 68 (4)
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