Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


J. Korean Phy. Soc. 2011; 59(5(1)): 3239-3245

Published online November 15, 2011

Copyright © The Korean Physical Society.

Study of a QCW Light-emitting-diode (LED)-pumped Solid-state Laser

Kangin Lee, Sangyoon Bae, Jin Seog Kwak, Jin Hyuk Kwon, Jong hoon Yi


Lasing of solid-state lasers pumped by light emitting diode (LED) was studied to replace quasi continuous wave (QCW) laser diode in solid-state laser pumping. The investigated solid-state gain media include Nd doped materials (Nd:YAG, Nd:glass, Nd/Cr:YAG), Ti:sapphire, and solid dye. The gain medium was surrounded by arrays of LEDs very closely. The absorbed LED distribution in gain medium was calculated by non-sequential ray tracing software. The calculated data transferred to cavity analysis software and lasing characteristics were simulated. The calculated result of absorbed LED distribution and absorption efficiency in the Nd:YAG rod was compared to experimentally measured fluorescence profile and absorption efficiency and the result calculation is accurate with error of 11%. Among the investigated gain media, Nd/Cr:YAG showed the lowest lasing threshold. It is also found that the use of reflector in the pumping chamber can lower the lasing threshold of Nd:YAG to half of the lasing threshold without the reflector.

Keywords: Light emitting diode, LED, Solid-state laser