Heeseong Jeong
Sogang University
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Publication
Featured researches published by Heeseong Jeong.
Optics Communications | 2002
Heeseong Jeong; Jong-Hoi Kim; Kyuman Cho
We present a novel multiport coherent optical detection scheme which can simultaneously measure phase and amplitude of a signal beam. Using a scanning interferometer arrangement, we were able to map local variations of magnitude and phase of the complex reflection coefficient of a surface or thin film. We will show that this scheme can be used not only for locating defects on the surface but also for identifying the nature of defects.
Review of Scientific Instruments | 2003
Heeseong Jeong; Noh-Min Kwak; Hyeongjun Huh; Kyuman Cho
We present here an active feedback control scheme which can maintain the distance between a laterally vibrating tapered optical fiber tip (TOFT) and a one facet of a laser diode (LD) at optimum value to measure the vibration amplitude of the TOFT in an optical feedback shear-force measurement scheme. Extremely good sensitivity for measuring the vibration amplitude, 9.58×10−2 pm/√Hz for a metal coated TOFT, can be maintained for at least 6 h by use of an active stablization scheme. Using a linearized lasing model of the LD in the presence of optical feedback, we are able to determine the vibration amplitude and effective reflection coefficient of the TOFT.
Frontiers in Optics | 2003
Heeseong Jeong; Sung-Tae Hwang; Kyuman Cho
Effect of the initial polarization state of an axially symmetric beam propagating through a self-focusing medium has been observed by the use of a near-field scanning optical microscope (NSOM). As predicted in the theory of vectorial effects, a circularly polarized beam is likely to suppress multiple filamentation (MF).
Optics Communications | 2005
Heeseong Jeong; Sung-Tae Hwang; Kyuman Cho
Archive | 2012
Soon-Ryong Park; Woo-Suk Jung; Heeseong Jeong; Eun-ah Kim; Hee-Chul Jeon; Chul-Woo Jeong; Noh-Min Kwak; Joo-Hwa Lee
Archive | 2011
Il-Ryong Cho; Chul-Woo Jeong; Heeseong Jeong; Woo-Suk Jung; Tae-Kyu Kim; Sung-Soo Koh; Soon-Ryong Park; 憙星 丁; 順龍 朴; 一龍 趙; 又碩 鄭; 哲宇 鄭; 泰奎 金; 晟洙 高
Archive | 2002
Kyuman Cho; Youngwan Choi; Heeseong Jeong
Archive | 2011
Soon-Ryong Park; Woo-Suk Jung; Heeseong Jeong; Tae-Kyu Kim; Sun-Hwa Kim
Microwave and Optical Technology Letters | 2004
Noh-Min Kwak; Hyeongjun Huh; Heeseong Jeong; Kyuman Cho
Archive | 2012
Heeseong Jeong; Sun-Hwa Kim; Soon-Ryong Park