Affiliation: | aCollege of Electronics and Information, Institute for Laser Engineering, Kyunghee University, 1 Seocheon-dong, Giheung-gu, Yongin-shi, Gyeonggi-do 446-701, South Korea bLutronic Corporation, 421 Ilsan Technotown 1141-1, Baeksok-Dong, Ilsan-Gu, Goyang-Si, Gyeonggi-Do 411-722, Republic of Korea |