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Generation of an Effective Flat-Top Mode from an Actively Q-Switched Nd:YAG Laser Used as a Light Source for the Treatment of a Large Area
New Phys.: Sae Mulli 2018; 68: 491~495
Published online April 30, 2018;
© 2018 New Physics: Sae Mulli.

Kun Hee RHYEE1, Do Hwan KWON1, Jin Hyuck CHOI1, Han Tae CHOO*2, Gyu Ug KIM2

1 Department of Physics, Kumoh National Institute of Technology, Gumi 39253, Korea
2 Department of Optical Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
Correspondence to:
Received December 15, 2017; Revised March 9, 2018; Accepted March 20, 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.
For large-area treatment of dermatologynevi of ota, pigments and melasma, an actively Q-switched Nd:YAG laser with two circular apertures in the cavity was developed. The developed laser was found to generate a more effective flat-top mode than the laser with a diffractive optical element (DOE) mirror. At a Q-switching frequency of 1 Hz and a flash-lamp charging voltage of 1000 V, the output energy and the pulse width achieved using the flat-top mode Nd:YAG laser were 0.517 J and 7 ns, respectively; the maximum peak power was about 74 MW.
PACS numbers: 42.55.Rz, 42.60.Gd, 42.60.Jf
Keywords: Nd:YAG laser, Actively Q-switching, Flat-top mode generation

April 2018, 68 (4)
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