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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Optics and Photonics
Journal Basic Information
Journal DOI :
Optical Society of Korea
Editor in Chief :
Volume & Issues
Volume 26, Issue 6 - Dec 2015
Volume 26, Issue 5 - Oct 2015
Volume 26, Issue 4 - Aug 2015
Volume 26, Issue 3 - Jun 2015
Volume 26, Issue 2 - Apr 2015
Volume 26, Issue 1 - Feb 2015
Selecting the target year
Clinical Applications of Intracoronary OCT (Invited Paper)
Ha, Jinyong ; Kim, Jung-Sun ; Hong, Myeong-Ki ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 1~8
DOI : 10.3807/KJOP.2015.26.1.001
The most common cause of a heart attack is known as coronary artery disease, which narrows the arteries and reduces the blood flow to the heart. To treat coronary artery stenosis, percutaneous coronary intervention (PCI) (a nonsurgical procedure to install a stent, which holds the artery wall open) is performed. Intracoronary optical coherence tomography (OCT) is a catheter-based, invasive optical imaging system. To determine whether PCI is appropriate, and to perform stent evaluation in a catheterization laboratory, OCT examinations are carried out. This review details the fundamental principles and technological status of intracoronary OCT imaging, and discusses the ongoing clinical applications to determine the benefits of OCT-guided PCI.
Measurement of Aerosols and Ice Clouds Using Ellipsometry Lidar
Kim, Dukhyeon ; Cheong, Hai Du ; Volkov, Sergei N. ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 9~16
DOI : 10.3807/KJOP.2015.26.1.009
We have developed ellipsometry lidar and measured aerosol and ice-cloud characteristics. To measure a full normalized backscattering phase matrix (NBSPM) composed of nine elements, we have designed an optical system with three kinds of transmission and three kinds of reception, composed of
waveplate and empty optic. To find systematic optical errors, we used clean day middle-altitude (4-6km) lidar signals for which the aerosol's concentration was small and its orientation chaotic. After calibrating our lidar system, we have calculated NBSPM elements scattered from an aerosol and from an ice cloud. In the case of an aerosol, we found that the off-diagonal values
of the NBSPM are smaller than those for a cirrus cloud. Also, the off-diagonal values of the NBSPM from a cirrus cloud depend on atmospheric conditions.
Analysis of the Reflection Characteristics of a Rectangular Corner Cube Retro-Reflector
Jeong, Yong-Beom ; Kim, Young-Hoon ; O, Beom-Hoan ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 17~22
DOI : 10.3807/KJOP.2015.26.1.017
The applications for retro-reflectors, with their unique reflection characteristics, have been expanding, to include venetian blind slats, displays, traffic safety mark, etc. We propose expandable structures of inclined corner cube retro-reflectors and analyze their corresponding reflection characteristics. Various traffic safety structures with retro-reflectors may be designed more quantitatively using the chart of characteristics we have presented.
Study of a Brain Tumor and Blood Vessel Detection System Using Multiple Fluorescence Imaging by a Surgical Microscope
Lee, Hyun Min ; Kim, Hong Rae ; Yoon, Woong Bae ; Kim, Young Jae ; Kim, Kwang Gi ; Kim, Seok Ki ; Yoo, Heon ; Lee, Seung Hoon ; Shin, Min Sun ; Kwon, Ki Chul ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 23~29
DOI : 10.3807/KJOP.2015.26.1.023
In this paper, we propose a microscope system for detecting both a tumor and blood vessels in brain tumor surgery as fluorescence images by using multiple light sources and a beam-splitter module. The proposed method displays fluorescent images of the tumor and blood vessels on the same display device and also provides accurate information about them to the operator. To acquire a fluorescence image, we utilized 5-ALA (5-aminolevulinic acid) for the tumor and ICG (Indocyanine green) for blood vessels, and we used a beam-splitter module combined with a microscope for simultaneous detection of both. The beam-splitter module showed the best performance at 600 nm for 5-ALA and above 800 nm for ICG. The beam-splitter is flexible to enable diverse objective setups and designed to mount a filter easily, so beam-splitter and filter can be changed as needed, and other fluorescent dyes besides 5-ALA and ICG are available. The fluorescent images of the tumor and the blood vessels can be displayed on the same monitor through the beam-splitter module with a CCD camera. For ICG, a CCD that can detect the near-infrared region is needed. This system provides the acquired fluorescent image to an operator in real time, matching it to the original image through a similarity transform.
Design and Implementation of a Radiative Temperature Measurement System for a Flash Light
Jin, Jung-Ho ; Han, Seungoh ; Yang, Hee Won ; Park, Seung-Man ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 30~37
DOI : 10.3807/KJOP.2015.26.1.030
The design and implementation of a radiative temperature measurement system for a flash light are carried out. Since a massive amount of energy is emitted within a very short time, it is impossible to measure the temperature of a flash with a conventional method. It is also irrelevant to measure one with an optical noncontact method. In this paper, a radiative temperature measurement system using the ratio of spectral radiances over mid- and long-wavelength infrared (IR) is designed and implemented. The implemented system utilizes optical bandpass filters to divide the wavelengths within the mid- and long-wavelength IR ranges, and pyroelectric IR detectors to measure the incident optical power of each wavelength-divided channel. It is shown that the measured radiative temperature of a flash is in the range of 1393 to 1455 K. This temperature-measurement system can be utilized to obtain information about the spectral radiance of a flash as a light source, which is of crucial importance to approaching the modeling and simulation of the various effects of a flash.
A Linearly Polarized Long-Cavity Yb:YAG Laser with a Variable-Reflectivity Output Coupler
Kim, Hyun Chul ; Lim, Han Bum ; Kim, Hyun Su ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 38~43
DOI : 10.3807/KJOP.2015.26.1.038
We propose a linearly polarized long-cavity Yb:YAG laser with a variable-reflectivity output coupler and investigate its output characteristics. The variable output coupler consists of a polarized beam splitter and a quarter-wave plate. The linearly polarized laser has a long cavity length of about 3.7 m. The slope efficiency of the proposed laser is 19%, and the beam quality (
) is about 1.2.
The Study of Gigapixel Camera Technology and the Stunning High-Resolution Gigapixel Image Created by Utilizing a Robotic Panoramic Head and an Image-Stitching Technique
Choi, Yeon Chan ; Moon, Hee Jun ; Kim, Dong Young ; Ryu, Jae Yun ; Shin, Ye Rang ; Rim, Cheon-Seog ;
Korean Journal of Optics and Photonics, volume 26, issue 1, 2015, Pages 44~53
DOI : 10.3807/KJOP.2015.26.1.044
Since the technology of current image sensors is limited to the megapixel class, it is necessary to use an image-stitching technique to create a gigapixel image from hundreds or thousands of photos taken by a megapixel image sensor. In this paper, we investigate the entire process of gigapixel camera technology employing a robotic panoramic head plus a stitching technique, and analyze the gigapixel camera technologies of Duke University and BAE Systems from the viewpoint of optical design structure. Hopefully this knowledge will lead to a new optical structure for a gigapixel camera. Meanwhile, we also perceive the need for additional image processing to reduce the noise of photos with a background of fog and mist, taken far from the camera lens.