Multimedia Article

The AESTHETICS 2020; 1(1): 46-49

Published online April 30, 2020

© Korean Association For Laser Dernatology And Trichology

Development of Picosecond 755-nm Alexandrite Laser for Treatment of Skin Aging

Seokwon Oh, MS, Hanyoung Ryu, PhD, Youngseok Seo , PhD

R&D Center, Wontech Co., Ltd., Daejeon, Korea

Correspondence to: Youngseok Seo
R&D Center, Wontech Co., Ltd., Daejeon 34028, Korea

Received: March 13, 2020; Revised: March 30, 2020; Accepted: April 10, 2020

This is an open access article distributed under the terms of the Creative Commons Attribution Non- Commercial License ( which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


We have developed a picosecond 755 nm alexandrite laser system. To generate picosecond laser pulses, we used self-injection techniques including Q-switch and cavity dump without mode-locking method. We have achieved through a comprehensive combination of complex optical technique, thermodynamic design, high power design, high-speed driver, and precise control technique. The uniform energy of the beam profile allows a safe and effective treatment outcome to be predicted.

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Keywords: Picosecond laser, Alexandrite laser, Picowon, Removing tattoos, Pigmented lesions