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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Optical Society of Korea
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Optical Society of Korea
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Volume & Issues
Volume 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
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Study for Improvement of Laser Induced Damage of 1064 nm AR Coatings in Nanosecond Pulse
Jiao, Hongfei ; Cheng, Xinbing ; Lu, Jiangtao ; Bao, Ganghua ; Zhang, Jinlong ; Ma, Bin ; Liu, Huasong ; Wang, Zhanshan ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 1~4
DOI : 10.3807/JOSK.2013.17.1.001
For the conventionally polished fused silica substrate, an around 100 nm depth redeposition polishing layer was formed on the top of surface. Polishing compounds, densely embedded in the redeposition polishing layer were the dominant factor that limited the laser induced damage threshold (LIDT) of transmission elements in nanosecond laser systems. Chemical etching, super-precise polishing and ion beam etching were employed in different ways to eliminate these absorbers from the substrate. After that, Antireflection (AR) coatings were deposited on these substrates in the same batch and then tested by 1064 nm nano-pulse laser. It was found that among these techniques only the ion beam etching method, which can effectively remove the polishing compound and did not induce extra absorbers during the disposal process, can successfully improve the LIDT of AR coatings.
High Power Continuous-Wave and Graphene Q-switched Operation of Er:YAG Ceramic Lasers at ~1.6 ㎛
Wang, Yong ; Chen, Hao ; Shen, Deyuan ; Zhang, Jian ; Tang, Dingyuan ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 5~9
DOI : 10.3807/JOSK.2013.17.1.005
We report on high-power continuous-wave operations of an Er:YAG ceramic laser in-band pumped by a cladding-pumped Er,Yb fiber laser at 1532 nm. With an output coupler of 10% transmission, the ceramic laser yielded 16.7 W of continuous-wave output at 1645 nm for 28.8 W of incident pump power, corresponding to a slope efficiency of 61.0% with respect to the incident pump power. The lasing wavelength switched to 1617 nm when output couplers of > 20% transmission were used. Up to 16.2 W of 1617 nm output was generated for 33.0 W of incident pump power, corresponding to a slope efficiency of 51.8%. Graphene Q-switched operation of Er:YAG cermic laser at 1645 nm was also demonstrated with stable pulses of 30-74 kHz repetition rates and 1.5-6.4
Different Adsorption Behavior of Rare Earth and Metallic Ion Complexes on Langmuir Monolayers Probed by Sum-Frequency Generation Spectroscopy
Sung, Woongmo ; Vaknin, David ; Kim, Doseok ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 10~15
DOI : 10.3807/JOSK.2013.17.1.010
Adsorption behavior of counterions under a Langmuir monolayer was investigated by sum-frequency generation (SFG) spectroscopy. By comparing SFG spectra of arachidic acid (AA) Langmuir monolayer/water interface with and without added salt, it was found that the simple trivalent cation
adsorbed on AA monolayer only when the carboxylic headgroups are charged (deprotonated), implying that counterion adsorption is induced by Coulomb interaction. On the other hand, metal hydroxide complex
adsorbed even on a charge-neutral AA monolayer, indicating that the adsorption of iron hydroxide is due to chemical interaction such as covalent or hydrogen bonding to the headgroup of the molecules at the monolayer.
Numerical Study of Enhanced Performance in InGaN Light-Emitting Diodes with Graded-composition AlGaInN Barriers
Kim, Su Jin ; Kim, Tae Geun ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 16~21
DOI : 10.3807/JOSK.2013.17.1.016
In this paper, we report the effect of GaN/graded-composition AlGaInN/GaN quantum barriers in active regions on the electrical and optical properties of GaN-based vertical light emitting diodes (VLEDs). By modifying the aluminum composition profile within the AlGaInN quantum barrier, we have achieved improvements in the output power and the internal quantum efficiency (IQE) as compared to VLEDs using conventional GaN barriers. The forward voltages at 350 mA were calculated to be 3.5 and 4.0 V for VLEDs with GaN/graded-composition AlGaInN/GaN barriers and GaN barriers, respectively. The light-output power and IQE of VLEDs with GaN/graded-composition AlGaInN/GaN barriers were also increased by 4.3% and 9.51%, respectively, as compared to those with GaN barriers.
Analysis on the Luminous Efficiency of Phosphor-Conversion White Light-Emitting Diode
Ryu, Han-Youl ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 22~26
DOI : 10.3807/JOSK.2013.17.1.022
The author analyzes the luminous efficiency of the phosphor-conversion white light-emitting diode (LED) that consists of a blue LED chip and a yellow phosphor. A theoretical model is derived to find the relation between luminous efficiency (LE) of a white LED, wall-plug efficiency (WPE) of a blue LED chip, and the phosphor absorption ratio of blue light. The presented model enables to obtain the theoretical limit of LE and the lower bound of WPE. When the efficiency model is applied to the measured results of a phosphor-conversion white LED, the limit theoretical value of LE is obtained to be 261 lm/W. In addition, for LE of 88 lm/W at 350 mA, the lower bound of WPE in the blue LED chip is found to be ~34%. The phosphor absorption ratio of blue light was found to have an important role in optimizing the luminous efficiency and colorimetric properties of phosphor-conversion white LEDs.
Study of the Correlation of Plasma Resonance and the Refractive Index to Dielectric Dispersion in the Complex Plane
Zhou, Xiao-Yong ; Shen, Yan ; Hu, Er-Tao ; Chen, Jian-Bo ; Zhao, Yuan ; Sheng, Ming-Yu ; Li, Jing ; Zheng, Yu-Xiang ; Zhao, Hai-Bin ; Chen, Liang-Yao ; Li, Wei ; Jiang, Xun-Ya ; Lee, Young-Pak ; Lynch, David W. ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 27~32
DOI : 10.3807/JOSK.2013.17.1.027
Based on the dispersive feature of the dielectric function of noble metals and the wave vector conservation in physics, both the plasma effect and the complex refractive index, which are profoundly correlated to the complex dielectric function and permeability, have been studied and analyzed. The condition to induce a bulk or a surface plasma in the visible region will not be satisfied, and there will be one solution for the real and the imaginary parts of the refractive index, restricting it only to region I of the complex plane. The results given in this work will aid in understanding the properties of light transmission at the metal/dielectric interface as characterized by the law of refraction in nature.
Fabry-Perot Filter Constructed with Anisotropic Space Layer and Isotropic Mirrors
Qi, Hongji ; Hou, Yongqiang ; Yi, Kui ; Shao, Jianda ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 33~37
DOI : 10.3807/JOSK.2013.17.1.033
In this study a new design concept of the Fabry-Perot filter, constructed with an anisotropic space layer and a couple of isotropic mirrors, was proposed based on the Maxwell equations and the characteristic matrix method. The single- and double-cavity Fabry-Perot filters were designed, and their optical properties were investigated with a developed software package. In addition, the dependence of the transmittance and phase shift for two orthogonal polarization states on the column angle of the anisotropic space layer and the incidence angle were discussed. We demonstrated that the polarization state of electromagnetic waves and phase shifts can be modulated by exploiting an anisotropic space layer in a polarization F-P filter. Birefringence of the anisotropic space layer provided a sophisticated phase modulation with varied incidence angles over a broad range, resulting in a wide-angle phase shift. This new concept would be useful for designing optical components with isotropic and anisotropic materials.
Determination of Optical Constants of Thin Films in Extreme Ultraviolet Wavelength Region by an Indirect Optical Method
Kang, Hee Young ; Lim, Jai Dong ; Peranantham, Pazhanisami ; HwangBo, Chang Kwon ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 38~43
DOI : 10.3807/JOSK.2013.17.1.038
In this study, we propose a simple and indirect method to determine the optical constants of Mo and ITO thin films in the extreme ultraviolet (EUV) wavelength region by using X-ray reflectometry (XRR) and Rutherford backscattering spectrometry (RBS). Mo and ITO films were deposited on silicon substrates by using an RF magnetron sputtering method. The density and the composition of the deposited films were evaluated from the XRR and RBS analysis, respectively and then the optical constants of the Mo and ITO films were determined by an indirect optical method. The results suggest that the indirect method by using the XRR and RBS analysis will be useful to search for suitable high absorbing EUVL mask material quickly.
10 Gbps Transimpedance Amplifier-Receiver for Optical Interconnects
Sangirov, Jamshid ; Ukaegbu, Ikechi Augustine ; Lee, Tae-Woo ; Cho, Mu Hee ; Park, Hyo-Hoon ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 44~49
DOI : 10.3807/JOSK.2013.17.1.044
A transimpedance amplifier (TIA)-optical receiver (Rx) using two intersecting active feedback system with regulated-cascode (RGC) input stage has been designed and implemented for optical interconnects. The optical TIA-Rx chip is designed in a 0.13
CMOS technology and works up to 10 Gbps data rate. The TIA-Rx chip core occupies an area of 0.051
with power consumption of 16.9 mW at 1.3 V. The measured input-referred noise of optical TIA-Rx is 20 pA/
Hz with a 3-dB bandwidth of 6.9 GHz. The proposed TIA-Rx achieved a high gain-bandwidth product per DC power figure of merit of 408
Optical-fiber Electronic Speckle Pattern Interferometry for Quantitative Measurement of Defects on Aluminum Liners in Composite Pressure Vessels
Kim, Seong Jong ; Kang, Young June ; Choi, Nak-Jung ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 50~56
DOI : 10.3807/JOSK.2013.17.1.050
Optical-fiber electronic speckle pattern interferometry (ESPI) is a non-contact, non-destructive examination technique with the advantages of rapid measurement, high accuracy, and full-field measurement. The optical-fiber ESPI system used in this study was compact and portable with the advantages of easy set-up and signal acquisition. By suitably configuring the optical-fiber ESPI system, producing an image signal in a charge-coupled device camera, and periodically modulating beam phases, we obtained phase information from the speckle pattern using a four-step phase shifting algorithm. Moreover, we compared the actual defect size with that of interference fringes which appeared on a screen after calculating the pixel value according to the distance between the object and the CCD camera. Conventional methods of measuring defects are time-consuming and resource-intensive because the estimated values are relative. However, our simple method could quantitatively estimate the defect length by carrying out numerical analysis for obtaining values on the X-axis in a line profile. The results showed reliable values for average error rates and a decrease in the error rate with increasing defect length or pressure.
All-optical Signal Processing of Fiber Impairments in Dual-Polarization 112 Gbit/s m-ary QAM Coherent Transmission
Asif, Rameez ; Islam, Muhammad Khawar ; Zafrullah, Muhammad ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 57~62
DOI : 10.3807/JOSK.2013.17.1.057
We have numerically implemented a receiver side all-optical signal processing method, i.e. optical backward propagation (OBP), by dispersion compensating fiber (DCF) and non-linear compensator (NLC) devised by effective negative Kerr non-linear coefficient using two highly non-linear fibers (HNLFs). The method is implemented for the post-processing of fiber transmission impairments, i.e. chromatic dispersion (CD) and non-linearities (NL). The OBP module is evaluated for dual-polarization (DP) m-ary (m=4,16,32,64,256) quadrature amplitude modulation (QAM) in 112 Gbit/s coherent transmission over 1200 km standard single mode fiber (SMF). We have also investigated an intensity limited optical backward propagation module (IL-OBP) by using a self-phase modulation-based optical limiter with an appropriate pre-chirping to compensate for the intensity fluctuations in the transmission link. Our results show that in highly non-linear sensitive 256QAM transmission, we have observed a 66% increase in the transmission distance by implementing IL-OBP as compared to conventional OBP.
Optical VSB Filtering of 12.5-GHz Spaced 64 × 12.4 Gb/s WDM Channels Using a Pair of Fabry-Perot Filters
Batsuren, Budsuren ; Kim, Hyung Hwan ; Eom, Chan Yong ; Choi, Jin Joo ; Lee, Jae Seung ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 63~67
DOI : 10.3807/JOSK.2013.17.1.063
We perform an optical vestigial sideband (VSB) filtering using a pair of Fabry-Perot (FP) filters. The transmittance curve of each FP filter is made to have sharp skirts using an offset between input and output coupling fibers. Moreover, the accurate periodicity of FP filters in the optical frequency domain enables the simultaneous VSB filtering of a large number of optical channels. With this VSB filtering technique, we transmit 12.5-GHz spaced
wavelength-division-multiplexing channels over a single-mode fiber up to 150 km without any dispersion compensations. When the channel spacing is reduced to 10 GHz, we achieve the spectral efficiency of 1 bit/s/Hz in conventional optical intensity modulation systems up to 125 km.
High Speed SD-OCT System Using GPU Accelerated Mode for in vivo Human Eye Imaging
Cho, Nam Hyun ; Jung, Unsang ; Kim, Suhwan ; Jung, Woonggyu ; Oh, Junghwan ; Kang, Hyun Wook ; Kim, Jeehyun ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 68~72
DOI : 10.3807/JOSK.2013.17.1.068
We developed an SD-OCT (Spectral Domain-Optical Coherence Tomography) system which uses a GPU (Graphics Processing Unit) for processing. The image size from the SD-OCT system is
and the speed is 110 frame/sec in real-time. K-domain linearization, FFT (Fast Fourier Transform), and log scaling were included in the GPU processing. The signal processing speed was about 62 ms using a CPU (Central Processing Unit) and 1.6 ms using a GPU, which is 39 times faster. We performed an in-vivo retinal scan, and reconstructed a 3D visualization based on C-scan images. As a result, there were minimal motion artifacts and we confirmed that tomograms of blood vessels, the optic nerve, and the optic disk are clearly identified. According to the results of this study, this SD-OCT can be applied to real-time 3D display technology, particularly auxiliary instruments for eye operations in ophthalmology.
Detection System for Sub-micrometer Defects of a Photo-mask Using On-axis Interference between Reflected and Scattered Lights
Lee, Sangon ; Jo, Jae Heung ; Kim, Jong Soo ; Moon, Il Kweon ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 73~80
DOI : 10.3807/JOSK.2013.17.1.073
In the process of lithography using ultra violet light sources for semiconductor devices, most of defects are made by sub-micrometer pollutants generated at photochemical reactions. We proposed and developed a novel vibration-insensitive on-axis interferometer with a sub-micrometer lateral resolution by using the interference between two beams: one scattered from defects and the other reflected from a reference area without defects. The proposed system was successfully demonstrated to detect a small Al defect of 0.5
diameter within the inspection time of less than 30 minutes over the area of the photo-mask which is 6 inch by 6 inch square.
Miniaturized Fluorometer Based on Total Internal Reflector and Condensing Mirror
Jang, Dae-Ho ; Yoo, Jae-Chern ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 81~85
DOI : 10.3807/JOSK.2013.17.1.081
A miniaturized fluorescence detection system based on total internal reflection (TIR) configuration, which is applicable to detecting the presence of biological materials labeled with fluorescence dye in micro total analysis systems (
), is proposed. In conventional fluorescence testing and analysis devices, interference between the excitation light beam and the emitted light from dyes is unavoidable. This paper presents a fluorescence detection system based on TIR configuration that allows the excitation light beam and the emitted light to be spatially perpendicular to each other so as to minimize the interference where fluorescence emission is detected at the orthogonal angle to the excitation beam. We achieved the limit of detection of about 5 nmol/L with a high linearity of 0.994 over a wide range of 6-FAM mol concentration, being comparable to that in earlier studies.
Contrast Enhancement of Laser Speckle Contrast Image in Deep Vasculature by Reduction of Tissue Scattering
Son, Taeyoon ; Lee, Jonghwan ; Jung, Byungjo ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 86~90
DOI : 10.3807/JOSK.2013.17.1.086
Various methods have been proposed for enhancing the contrast of laser speckle contrast image (LSCI) in subcutaneous blood flow measurements. However, the LSCI still suffers from low image contrast due to tissue turbidity. Herein, a physicochemical tissue optical clearing (PCTOC) method was employed to enhance the contrast of LSCI. Ex vivo and in vivo experiments were performed with porcine skin samples and male ICR mice, respectively. The ex vivo LSCIs were obtained before and 90 min after the application of the PCTOC and in vivo LSCIs were obtained for 60 min after the application of the PCTOC. In order to obtain the skin recovery images, saline was applied for 30 min after the application of the PCTOC was completed. The visible appearance of the tubing under ex vivo samples and the in vivo vasculature gradually enhanced over time. The LSCI increased as a function of time after the application of the PCTOC in both ex vivo and in vivo experiments, and properly recovered to initial conditions after the application of saline in the in vivo experiment. The LSCI combined with the PCTOC was greatly enhanced even in deep vasculature. It is expected that similar results will be obtained in in vivo human studies.
Optical Monitoring of Tumors in BALB/c Nude Mice Using Optical Coherence Tomography
Song, Hyun-Woo ; Lee, Sang-Won ; Jung, Myung-Hwan ; Kim, Kye Ryung ; Yang, Seungkyoung ; Park, Jeong Won ; Jeong, Min-Sook ; Jung, Moon Youn ; Kim, Seunghwan ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 91~96
DOI : 10.3807/JOSK.2013.17.1.091
We report a method for optical monitoring of tumors in an animal model using optical coherence tomography (OCT). In a spectral domain OCT system, a superluminescent diode light source with a full width of 66 nm at half maximum and peak wavelength of 950 nm was used to take images having an axial resolution of 6.8
. Cancer cells of PC-3 were cultured and inoculated into the hypodermis of auricle tissues in BALB/c nude mice. We observed tumor formation and growth at the injection region of cancer cells in vivo and obtained the images of tumor mass center and sparse circumferences. On the
day from an inoculation of cancer cells, histological images of the tumor region using cross-sectional slicing and dye staining of specimens were taken in order to confirm the correlation with the high resolution OCT images. The OCT image of tumor mass compared with normal tissues was analyzed using its A-scan data so as to obtain a tissue attenuation rate which increases according to tumor growth.
Frequency Tuning Characteristics of a THz-wave Parametric Oscillator
Li, Zhongyang ; Bing, Pibin ; Xu, Degang ; Yao, Jianquan ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 97~102
DOI : 10.3807/JOSK.2013.17.1.097
Frequency tuning characteristics of a THz-wave by varying phase-matching angle and pump wavelength in a noncollinear phase-matching THz-wave parametric oscillator (TPO) are analyzed. A novel scheme to realize the tuning of a THz-wave by moving the cavity mirror forwards and backwards is proposed in a noncollinear phase-matching TPO. The parametric gain coefficients of the THz-wave in a
crystal are explored under different working temperatures. The relationship between the poling period of periodically poled
(PPLN) and the THz-wave frequency under the condition of a quasi-phase-matching configuration is deduced. Such analyses have an impact on the experiments of the TPO.
Design and Implementation of Vibration Isolation System for Mobile Doppler Wind LIDAR
Song, Xiaoquan ; Chen, Chao ; Liu, Bingyi ; Xia, Jinbao ; Stanic, Samo ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 103~108
DOI : 10.3807/JOSK.2013.17.1.103
The operation of a Doppler wind LIDAR in a mobile environment is very sensitive to shocks and vibrations, which can cause critical failures such as misalignment of the optical path and damage to optical components. To be able to stabilize the LIDAR and to perform wind field measurements in motion, a shock absorption and vibration isolation system was designed and implemented. The performance of the vehicle-mounted Doppler wind LIDAR was tested in motion, first in a circular test route with a diameter of about 30 m and later in regular expressway traffic. The vibration isolation efficiency of the system was found to be higher than 82% in the main vibration area and shock dynamic deflection was smaller than maximal deflection of the isolator. The stability of the laser locking frequency in the same mobile environment before and after the vibration isolation system installation was also found to be greatly improved. The reliability of the vibration isolation system was confirmed by good results of the analysis of the LIDAR data, in particular the plane position indicator of the line of sight velocity and the wind profile.
ERRATUM : Design of Ultra-Wide Band-Pass Filter Based on Metamaterials Applicable to Microwave Photonics
Lee, Chongmin ; Shim, Wooseok ; Moon, Yong ; Seo, Chulhun ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 109~109
DOI : 10.3807/JOSK.2013.17.1.109
ERRATUM : Real-time Measurement of Full Field Retardation Near Quarter Wavelength
Liu, Longhai ; Zeng, Aijun ; Yuan, Qiao ; Zhu, Linglin ; Fang, Ruifang ; Huang, Huijie ;
Journal of the Optical Society of Korea, volume 17, issue 1, 2013, Pages 110~110
DOI : 10.3807/JOSK.2013.17.1.110