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파장가변 Sampled-grating Distributed Bragg Reflector (SG-DBR) 레이저 다이오드 제작
이지면,오수환,고현성,박문호 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.1
We present the fabrication and performance of wavelength tunable butt coupled (BT) sampled-grating (SG) distributed bragg reflector (DBR) - planar buried heterostructure (PBH) laser diodes (LD). The fabricated LD showed the high optical output power due to the high coupling efficiency between active and passive components by the BT coupling methods. The series resistance and diode ideality factor of LD were measured to be 3.7 $\Omega$ and 1.35, respectively. The average threshold current was 25 ㎃. The output powers of BT-SG DBR-PBH-LD were obtained to be as high as 12.3 and 24.56 ㎽ at 100 and 200 ㎃, respectively. The maximum wavelength tuning range was about 31 nm and the side mode suppression ratio was about 37 dB.
이지면,Chul-Wook Lee,Hyunsung Ko,Ki-Soo Kim,Moon Ho Park,Sahnggi Park,Su Hwan Oh 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
The fabrication and the characteristics of a wavelength tunable butt coupled (BT) sampledgrating (SG) distributed bragg reflector (DBR) - planar buried heterostructure (PBH) laser diode (LD) is described. The average threshold current was 25 mA, and the output powers of the fabricated LD were determined to be as high as 12.3 and 24.56 mW at 100 and 200 mA, respectively, with a side mode suppression ratio of about 37 dB. The series resistance and the diode ideality factor of a LD were determined to be 3.7 ± 0.2 and 1.35 ± 0.1, respectively, by exploiting an electrical derivative analysis method. The series resistance of the SGDBR region, however, decreased with increasing current, showing a high resistance (4.4 at < 60 mA), a transient (60 mA 100 mA), and low resistance regions (0.6 at > 100 mA), indicating saturation of the refractive index change.
InP/InGaAsP 광자결정 구조 제작을 위한 건식 식각 특성
이지면,Lee, Ji-Myon 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.12
Two-dimensionally arrayed nanocolumn lattices were fabricated by using double-exposure laser holographic method. The hexagonal lattice was formed by rotating the sample with 60 degree while the square lattice by 90 degree before the second laser-exposure. The reactive ion etching for a typical time of 30 min using CH$_4$/H$_2$ plasma enhanced the aspect-ratio by more than 1.5 with a slight increase of the bottom width of columns. The etch-damage was observed by photoluminescence (PL) spectroscopy which was removed by the wet chemical etching using HBr/$H_2O$$_2$/$H_2O$ solution, leading into the enhanced PL intensities of the PCs.
레이저 홀로그래피 방법과 반응성 이온식각 방법을 이용한 InP/InGaAsP 광자 결정 구조 제작
이지면,이민수,이철욱,오수환,고현성,박상기,박문호 한국광학회 2004 한국광학회지 Vol.15 No.4
레이저 홀로그래피 방법과 반응성 이온식각 방법(RIE: reactive ion etching)을 사용하여 2차원 광자결정을 제작하였다. 육변형(hexagonal) 및 사변형(square) 광자결정 격자는 첫 번째 레이저 노광 후 시편을 각각 60도 및 90도 회전하고 다시 두 번째 노광을 통하여 제작할 수 있었다. 또한 사변형 광자결정 격자의 나노컬럼(nanocolumn)의 크기와 주기는 레이저 입사각에 따라 각각 125∼145 nm, 220∼290 nm로 미세한 조정이 가능하였다. 마지막으로 CH$_4$/H$_2$ 가스를 이용한 반응성 이온식각 방법을 통하여 aspect ratio가 1.5 이상인 InP/InGaAsP nanocolumn을 제작 할 수 있었다. Two-dimensionally arrayed nanocolumn lattices were fabricated by using double-exposure laser holographic method. The hexagonal lattice was formed by rotating the sample with 60 degree while the square lattice by 90 degree before the second laser-exposure. The size and period of nanocolumns could be controlled accurately from 125 to 145 nm in diameter and 220 to 290 nm in period for square lattice by changing the incident angle of laser beam. The reactive ion etching for a typical time of 30 min using CH$_4$/H$_2$ plasma enhanced the aspect-ratio by more than 1.5 with a slight increase of the bottom width of columns.
LabVIEW를 이용한 원격 Motion Control에 관한 연구
지면호(Myun-Ho Jee),권순재(Soon-Jae Kwon),정영석(Young-Seok Jung),손정기(Jeong-Ki Son),김태화(Tae-Hwa Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
The biggest obstacle in utilizing Telerobotics is that an exclusive line is necessary to connect the distant place and manipulator for the purpose of remote control Moreover, installment of an exclusive line is limited to relatively short distance, as the installment entails more difficulties with longer distance and increasing installment cost The purpose of this paper is to suggest a methodology of factory automation by using Lab VIEW to control and monitor actuators, which are the basis of controlling manipulators, form distant places