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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Optical Society of Korea
Journal Basic Information
Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 13, Issue 4 - Dec 2009
Volume 13, Issue 3 - Sep 2009
Volume 13, Issue 2 - Jun 2009
Volume 13, Issue 1 - Mar 2009
Selecting the target year
Optical Scanning Holography - A Review of Recent Progress
Poon, Ting-Chung ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 406~415
DOI : 10.3807/JOSK.2009.13.4.406
Optical scanning holography (OSH) is a distinct digital holographic technique in that real-time holographic recording a three-dimensional (3-D) object can be acquired by using two-dimensional active optical heterodyne scanning. Applications of the technique so far have included optical scanning cryptography, optical scanning microscopy, 3-D pattern recognition, 3-D holographic TV, and 3-D optical remote sensing. This paper reviews some of the recent progress in OSH. Some possible further works are also discussed.
Multi-kilowatt Single-mode Ytterbium-doped Large-core Fiber Laser
Jeong, Yoon-Chan ; Boyland, Alexander J. ; Sahu, Jayanta K. ; Chung, Seung-Hwan ; Nilsson, Johan ; Payne, David N. ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 416~422
DOI : 10.3807/JOSK.2009.13.4.416
We have demonstrated a highly efficient cladding-pumped ytterbium-doped fiber laser, generating
2.1 kW of continuous-wave output power at 1.1 μm with 74% slope efficiency with respect to launched pump power. The beam quality factor (
) was better than 1.2. The maximum output power was only limited by available pump power, showing no evidence of roll-over even at the highest output power. We present data on how the beam quality depends on the fiber parameter, based on our current and past fiber laser developments. We also discuss the ultimate power-capability of our fiber in terms of thermal management, Raman nonlinear scattering, and material damage, and estimate it to 10 kW.
THz Filter Using the Transverse-electric (TE
) Mode of the Parallel-plate Waveguide
Lee, Eui-Su ; Jeon, Tae-In ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 423~427
DOI : 10.3807/JOSK.2009.13.4.423
The results of the experimental and theoretical studies conducted on terahertz filtering using two parallel-plate waveguides (PPWGs) are presented herein. The first PPWG with 355
plate separation generates 4 THz bandwidth TM modes (
), whereas the second PPWG with 100
plate separation operated the THz filter for the generated TM modes with 1.5 THz cutoff frequency. The outgoing THz wave of the two PPWGs was truncated until 1.5 THz, and the system was operated using a high-pass THz filter. The absorption and dispersion of the combined TM and TE modes for the filtering system were calculated. The theoretical calculation and measurement results for the cutoff and oscillation frequency in the spectrum domain agreed well.
Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes
Kim, Sun-Duck ; Kim, Gil-Hwan ; Hwang, Kyu-Jin ; Lim, Sun-Do ; Lee, Kwan-Il ; Kim, Sang-Hyuck ; Lee, Sang-Bae ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 428~433
DOI : 10.3807/JOSK.2009.13.4.428
A photonic crystal fiber with two large air holes outside the holey cladding region is fabricated to induce an effective long periodic grating (LPG) in the core by an electric arc discharge. We believe that the two large air holes lead to the asymmetric perturbation in the core under the electric arc discharge, thereby introducing the coupling to the first higher-order mode. The transmission characteristics of the PCF with the LPG for the external perturbation such as strain, curvature, and temperature are also investigated. It was found that the shift of resonance peak in the transmission spectrum depends on the bending direction. The curvature of 8.55
results in the center wavelength shifts of 1.8, 4.3, and 11 nm for a vertical, diagonal, and horizontal direction of the curvature to the large air-hole alignment, respectively.
A 12.5-Gb/s Optical Transmitter Using an Auto-power and -modulation Control
Oh, Won-Seok ; Park, Kang-Yeob ; Im, Young-Min ; Kim, Hwe-Kyung ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 434~438
DOI : 10.3807/JOSK.2009.13.4.434
In this paper, a 12.5-Gb/s optical transmitter is implemented using 0.13-
CMOS technology. The optical transmitter that we constructed compensates temperature effects of VCSEL (Vertical cavity surface emitting laser) using auto-power control (APC) and auto-modulation control (AMC). An external monitoring photodiode (MPD) detects optical power and modulation. The proposed APC and AMC demonstrate 5
20-mA of bias-current control and 5
20-mA of modulation-current control, respectively. To enhance the bandwidth of the optical transmitter, an active feedback amplifier with negative capacitance compensation is exploited. The whole chip consumes only 140.4-mW of DC power at a single 1.8-V supply under the maximum modulation and bias currents, and occupies the area of 1280-
excluding bonding pads.
Accurate Evaluation of Polarization Characteristics in the Integrated Optic Chip for Interferometric Fiber Optic Gyroscope Based on Path-matched Interferometry
Choi, Woo-Seok ; Jo, Min-Sik ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 439~444
DOI : 10.3807/JOSK.2009.13.4.439
Accurate evaluation of polarization characteristics in the integrated optic chip (IOC) for interferometric fiber optic gyroscope was performed. Spatial distribution of optical wavetrains caused by the polarization parameters such as local polarization cross-coupling and polarization rejection coefficient of the IOC were measured utilizing the path-matched optical coherence domain polarimetry (PM-OCDP). With the analytic model deduced from Jones matrix representation, we could accurately identify the polarization characteristics of the IOC. Both degree of measurement error due to the imperfect equipment conditions in PM-OCDP and birefringence of IOC chip were also characterized.
Analysis of Fingerprint Recognition Characteristics Based on New CGH Direct Comparison Method and Nonlinear Joint Transform Correlator
Jeong, Man-Ho ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 445~450
DOI : 10.3807/JOSK.2009.13.4.445
Fingerprint recognition using a joint transform correlator (JTC) is the most well-known technology among optical fingerprint recognition methods. The JTC method optically compares the reference fingerprint image with the sample fingerprint image then examines match or non-match by acquiring a correlation peak. In contrast to the JTC method, this paper presents a new method to examine fingerprint recognition by producing a computer generated hologram (CGH) of those two fingerprint images and directly comparing them. As a result, we present some parameters to show that fingerprint recognition capability of the CGH direct comparison method is superior to that of the JTC method.
Tilt Aberration Compensation Using Interference Patterns in Digital Holography
Cho, Hyung-Jun ; Kim, Doo-Cheol ; Yu, Young-Hun ; Shin, Sang-Hoon ; Jung, Won-Gi ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 451~455
DOI : 10.3807/JOSK.2009.13.4.451
We present a numerical procedure that compensates for tilt phase aberration in in-line digital holography by computing the period of interference patterns in the reconstructed phase image. This method enables the reconstruction of correct and accurate phase information, even if strong tilt aberrations exist. Example applications of tilt aberration compensation are shown for a tilted plate, a micro-lens array, and a thin film transistor. This method is convenient because it uses only one hologram and no hardware to minimize the tilt aberration.
Intermediate Holographic Data Storage System by Using Sequentially Superimposed Recording
Yi, Jong-Su ; Lee, Yeon-Ho ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 456~463
DOI : 10.3807/JOSK.2009.13.4.456
We introduce a holographic data storage system for intermediating between small data sets and mass holographic data recording. It employs a holographic sequentially superimposed recording technique. We discuss a time scheduling technique for making uniform reconstruction of sequentially recorded holograms and we show experimental results. We also discuss the Bragg selectivity of sequentially recorded holograms. The maximum storage density of our system is estimated to be 224kbit/
. Our system is useful as an intermediate recording system before recording mass holographic data in a larger system.
Ultra High-speed 3-dimensional Profilometry Using a Laser Grating Projection System
Park, Yoon-Chang ; Ahn, Seong-Joon ; Kang, Moon-Ho ; Kwon, Young-Chul ; Ahn, Seung-Joon ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 464~467
DOI : 10.3807/JOSK.2009.13.4.464
The grating projection method with phase-shifting technique is very useful in measuring the 3-dimensional (3D) shape with high accuracy and speed. In this work, we have developed an ultra high-speed digital laser grating projection system using a high-power laser diode and a highsensitivity CMOS camera. With our system, the optical measurement required to find out the profile of a 3D object could be carried out within 2.6 ms, which is a significant (
10 times) improvement compared with those of the previous studies.
Nondestructive Optical Measurement of Refractive-index Profile of Graded-index Lenses
Lee, Byoung-Hwak ; Shin, Nae-Ho ; Jeong, Kwan ; Park, Myoung-Jin ; Kim, Byung-Gyu ; Yoo, Jang-Hoon ; Kim, Dae-Geun ; Yun, Ki-Hyuck ; Lee, Kew-Seung ; Kim, Kyung-Hwan ; Kim, Dae-Kyu ; Park, Seung-Han ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 468~471
DOI : 10.3807/JOSK.2009.13.4.468
We propose a simple nondestructive method to obtain refractive-index profiles of a graded-index (GRIN) light-focusing rod by means of a diffraction grating. In our proposed method, a laser beam is illuminated through a diffraction grating perpendicular to the axis of the GRIN lens and the separation between the zeroth and first-order diffraction peaks is measured and analyzed. The results demonstrate that the refractive-index profiles of commercially available GRIN lenses can be successfully reconstructed.
Detection of Tendon Tears by Degree of Linear Polarization Imaging
Kim, Ji-Hoon ; Oh, Jung-Hwan ; Kang, Hyun-Wook ; Lee, Ho ; Kim, Jee-Hyun ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 472~477
DOI : 10.3807/JOSK.2009.13.4.472
A Stokes polarimetry imaging (SPI) system was developed and utilized to detect tendon tears by constructing the degree of linear polarization (DOLP) image maps after linearly polarized light illumination. The micro and partial-thickness tears of turkey tendons were made and imaged by the SPI system at different incident polarization angles (IPA) with different mechanical loads on the tendon. The micro and partial-thickness tendon tears were detected by the DOLP images due to weak birefringence around the tears. The tendon tears were detected by a highest DOLP contrast at longest visible wavelength (Red, 650
50 nm). All polarized images showed modulated DOLP as the incident polarization angle (IPA) was varied. The varying DOLP allowed the optimal detection of the micro and partial-thickness tendon tears at a certain IPA. The SPI system with variable IPA and spectral information can improve the detection of the tendon tears by higher visibility of fiber orientations, and thereby improve diagnosis and treatment of the tendon related injuries.
Simulation and Fabrication of the Cone Sheet for LCD Backlight Application
Baik, Sang-Hoon ; Hwang, Sung-Ki ; Kim, Young-Gyu ; Park, Gyeung-Ju ; Kwon, Jin-Hyuk ; Moon, Won-Taek ; Kim, Sung-Hoon ; Kim, Byoung-Ku ; Kang, Sin-Ho ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 478~483
DOI : 10.3807/JOSK.2009.13.4.478
An optical sheet with a cone array is designed, simulated, and fabricated in order to substitute the dual crossed prism sheets in the edge-type LCD backlight. The optimum structure of cone textures that is compatible with the dual crossed prism sheets was obtained by simulating the backlight installed with the cone array optical sheet. A SU-8 photoresist films of thickness
were spin-coated on a polyethylene terephtalate film (PET), and the cone texture array was formed by using the diffuse lithography that employed a photomask with circular patterns and an optical diffuser.
Non-propagating Surface Modes in Dual Singly Negative Material Layers
Kim, Kyoung-Youm ; Kim, Sae-Hwa ;
Journal of the Optical Society of Korea, volume 13, issue 4, 2009, Pages 484~488
DOI : 10.3807/JOSK.2009.13.4.484
We investigate the characteristics of the surface mode formed at the single interface between dual singly negative medium layers. It is shown that the interface can support a mode which has polarization degeneracy and a vanishing propagation constant. That is, this surface mode is a polarization-independent one that does not propagate at all through the interface. The corresponding electric and magnetic field distributions become static along the longitudinal (guiding) direction (but not along the transverse direction) resulting in the formation of transverse-electric/longitudinalmagnetic or transverse-magnetic/longitudinal-electric modes.