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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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Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 9, Issue 4 - Dec 2005
Volume 9, Issue 3 - Sep 2005
Volume 9, Issue 2 - Jun 2005
Volume 9, Issue 1 - Mar 2005
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Dependence of Optical Matrix Elements on the Boundary Conditions of the Continuum States in Quantum Wells
Jang Y. R. ; Yoo K. H. ; Ram-Mohan L. R. ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 39~44
DOI : 10.3807/JOSK.2005.9.2.039
Unlike for the bound states, several different boundary conditions are used for the continuum states above the barrier in semiconductor quantum wells. We employed three boundary conditions, infinite potential barrier boundary condition, periodic boundary condition and scattering boundary condition, and calculated the local number of states, wavefunctions and optical matrix elements for the symmetric and asymmetric quantum wells. We discussed how these quantities are related in the three boundary conditions. We argue that the scattering boundary condition has several advantages over the other two cases. These results would be useful in understanding quantum well lasers and detectors involving continuum states.
Effects of the Injected ASE Bandwidth on the Performance of Wavelength-locked Fabry-Perot Laser Diodes
Park Kun-Youl ; Baik Jin-Serk ; Lee Chang-Hee ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 45~48
DOI : 10.3807/JOSK.2005.9.2.045
We investigate effects of the injected ASE (Amplified spontaneous emission) bandwidth on the performance of the wavelength-locked Fabry-Perot laser diodes (F-P LDs) under constant injection power density and constant injection power. For the constant injection power density, we can determine the minimum injection bandwidth by the required intensity noise or the bit-error rate (BER) performance. On the other hand, there exists the optimal ASE bandwidth for the constant injection power to minimize the intensity noise.
Reflection-type Optical Waveguide Index Profiling Technique
Youk YoungChun ; Kim Dug Young ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 49~53
DOI : 10.3807/JOSK.2005.9.2.049
We report a new configuration of a reflection-type confocal scanning optical microscope system for measuring the refractive index profile of an optical waveguide. Several improvements on the earlier design are proposed; a light emitting diode (LED) at 650 nm wavelength instead of a laser diode (LD) or He-Ne laser is used as a light source for better index precision, and a simple longitudinal linear scanning and curve fitting techniques are adapted instead of a servo control for maintaining an optical confocal arrangement. We have obtained spatial resolution of 700 nm and an index precision of
. To verify the system's capability, the refractive index profiles of a conventional multimode fiber and a home-made four-mode fiber were examined with our proposed measurement method.
Mode Analysis and Modal Delay Measurement of a Few-Mode Fiber by Using Optical Frequency Domain Reflectometry
Ahn Tae-Jung ; Moon Sucbei ; Youk Youngchun ; Jung Yongmin ; Oh Kyunghwan ; Kim Dug Young ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 54~58
DOI : 10.3807/JOSK.2005.9.2.054
A novel mode analysis method and differential mode delay measurement technique for a multimode optical fiber based on optical frequency domain reflectometry has been proposed for the first time. We have used a conventional OFDR with a tunable external cavity laser and a Michelson interferometer. A few-mode optical multimode fiber was prepared to test our proposed measurement technique. The differential mode delay (DMD) of the sample fiber was measured to be 16.58 ps/m with a resolution of 1.5 ps/m. We have also compared the OFDR measurement results with those obtained using a traditional time-domain measurement method.
Three-beam Apodization in Photopolymer
Do Due Dung ; Kim Nam ; Lee Kwon Yeon ; Jeon Seok Hee ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 59~63
DOI : 10.3807/JOSK.2005.9.2.059
In this paper, we present a novel apodization technique using three beams to fabricate an apodized grating in photopolymer. An orthogonal-polarization beam used to control the saturated modulation amplitude of the grating is added during recording time. As a result of the experiment, holographic apodized gratings with uniform, inverse Gaussian, and triangular profiles are fabricated successfully in DuPont's HRF-150-38 photopolymer.
Q-Switching of a Diode-Pumped Nd:YVO
Laser with a Closely Folded Resonator
Lee Hyuncheol ; Lee Yongwoo ; Kwak Chonghoon ; Kwon Jinhyuk ; Yi Jonghoon ; Lim Yong-Sik ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 64~67
DOI : 10.3807/JOSK.2005.9.2.064
laser is developed. The laser has a closely folded resonator. The laser beam in two arms of the folded resonator passes the same acousto-optic modulator. The laser output power and pulsewidth dependence on a Q-switching frequency were measured. It is found that the newly proposed geometry provides an effective means for reducing the pulsewidth while maintaining almost the same output power compared with the usual folded resonator, where the beam in one arm of the resonator passes the acousto-optic modulator.
Reverse-optimization Alignment Algorithm using Zernike Sensitivity
Kim Eugene D. ; Choi Young-Wan ; Kang Myung-Seok ; Choi Se Chol ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 68~73
DOI : 10.3807/JOSK.2005.9.2.068
When aligning catoptric or catadioptric telescopes for space cameras, it is difficult to align precisely if the field of view is large or there are several reflective surfaces. The quantitative knowledge of mirror misalignments greatly helps align a misaligned telescope precisely, and also reduce the alignment time. This paper describes a generalized reverse-optimization alignment solution algorithm using Zernike sensitivity, and proposes the minimum number of fields to take interferograms. This method was successfully applied on a Cassegrain telescope design for Earth observation from space with arbitrary misalignments and a model including some primary mirror deformation.
Modeling of Defects Nucleation in the Inhomogeneous Liquid Crystal Director Field
Lee Gi-Dong ; Kim Jae Chang ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 74~78
DOI : 10.3807/JOSK.2005.9.2.074
With the fast Q-tensor method, which can model the defect dynamics in a liquid crystal director field, the nucleation and dynamical behavior of defects is modeled. In order to model the defect, hormeotropic aligned liquid crystal cell with step inhomogeneous electrode which has a height of
is used. From the simulation, we can observe the nucleation and line of the defect from surface inhomogeneity and the experiment is performed for confirmation. The experimental result is compared with numerical modeling in order to verify the simulation of the defect nucleation.
Spatial Characterization of MAC, a High-Resolution Optical Earth Observation Camera for Small Satellites
Kim Eugene D. ; Choi Young-Wan ; Yang Ho-Soon ; Ismail Mohd. Afiq bin ;
Journal of the Optical Society of Korea, volume 9, issue 2, 2005, Pages 79~83
DOI : 10.3807/JOSK.2005.9.2.079
Spatial calibrations have been performed on the Medium-sized Aperture Camera (MAC) of the RazakSAT satellite. Topics discussed in this paper include the measurements of system modulation transfer function (MTF), relative pixel line-of-sight (LOS), and end-to-end imaging tests. The MTF measurements were made by capturing the scanned knife-edge image on a pixel, and an issue in the MTF calculation algorithm is discussed. The method used to place the focal plane at the correct focal position is described, since they make use of MTF measurements. Relative LOS measurements are done by theodolite measurements of the telescope. Qualitative ground test result of end-to-end imaging is given.