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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
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Volume & Issues
Volume 12, Issue 6 - Dec 2001
Volume 12, Issue 5 - Oct 2001
Volume 12, Issue 4 - Aug 2001
Volume 12, Issue 3 - Jun 2001
Volume 12, Issue 2 - Apr 2001
Volume 12, Issue 1 - Feb 2001
Selecting the target year
Magneto-optical trap of slowed sodium atoms by using a Zeeman slower and the characteristics of trapped atoms
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 347~351
The neutral sodium atoms have been slowed down to the trap depth by using a Zeeman slower and trapped by the magneto-optical method. The density and the temperature of the trapped atoms are measured, and the frequency region where the trap is available is represented. We controlled the flux of slowed atoms by varying the slowing beam intensity, and we measured the increasing and decreasing rate of trapped atoms. We show that the difference between the increasing and decreasing rate of trapped atoms result from the loss proportional to
Design of null lenses for testing of hyperbolic surfaces
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 352~355
A null lens is designed for testing the hyperbolic mirror which is the first mirror of the off-axis three mirror anastigmat(TMA) designed as a high resolution camera for remote sensing. To choose a better null lens system for the hyperbolic surface under test, both autostigmatic and mixed type null lenses are designed and analysed for sensitivity with respect to change of each surface parameter such as the radius of curvature and the thickness.
A study on the effect of side-lobe on axial image of confocal microscope
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 356~361
The effect of side-lobe on axial image is investigated. We show, using computer simulation and experimentally, that an optimized axial response can be achieved by minimized side-lobe according to the Herschel condition and that the appearance of sidelobes is decreased by balancing phase error.
Aberration effects on white light interferometry
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 362~370
We prove that 3-D profile mapping using white light interferometry has systematic errors caused by aberrations of the optimal system. The tilt of an object invokes an offset between the object and the reference ray, which eventually makes the aberration cancel incompletely. The fringe peak of a white light interferogram is mainly affected by the aberration effect while the envelope peak remains stable. By the difference between the two peaks, it is easily confirmed how much the error existed in the fringe peak. Experimental results prove that the error caused by aberration is varied by object tilt, microscope NA, optics alignment within the range of
Fiber Bragg grating sensor using a Mach-Zehnder interferometer and EDFA for EDFA for simultaneous measurement of strain and temperature.
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 371~375
We have implemented a sensor head which consists of erbium doped fiber pumped by 1480 nm LD and single fiber Bragg grating for simultaneous measurement of strain and temperature. The measurement precision and speed are improved by using Mach-Zehnder interferometer instead of optical spectrum analyzer (OSA) as a demodulator. The measurement precision of temperature measured by the amplitude variation of output signal is 0.05
and that of strain measured by the phase variation of output signal is 0.1
strain. The measurement precision of temperature and strain are improved nearly 140 times and 700 times, respectively, compared to those using an OSA with wavelength resolution of 0.97 nm as d demodulator.
Characteristics of Photodetectors for spectral radiance measurements
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 376~381
We have fabricated a spectroadiometric system to measure spectral radiance of optical sources and evaluated its characteristics such as spectral responsivity, nonlinearity, and so on. The measurement system with PMT, Si, InGaAs, and IR-enhanced InGaAs detectors has shown a good linearity and a wide spectral responsivity of 250∼2500 nm. This spectroradiometric system will be used as the primary national standard system of spectral radiance measurements.
Development of KITSAT-3 camera and current status of the operation
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 382~388
KITSAT-3, launched at May 26 1999, has an earth observation optical payload named MEIS (Multi-spectral Earth Imaging System). The MEIS is a Managin mirror telescope of aperture size of 95mm, and it images the ground with the ground sampling distance of 13.8m over 48km at the altitude of 720km using three different observations bands. This paper first presents the design and then the optics, relating results of manufacturing, integration and test. Finally it briefly discusses the current status of MEIS operation.
Measurements of optical wavelength using WDM coupler
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 389~393
A wavemeter is realized using the fact that the coupling coefficient of a WDM coupler is a function of wavelength. Prototype devices with 1500 nm/1600 nm and 1510 nm/1550 nm WDM couplers are successfully fabricated and tested in the laboratory. The measurement resolutions are
0.27 nm over a wavelength range of 1515 nm~1576 nm for the device with 1500 nm/1600 nm WDM coupler and
0.103 nm over a wavelength range of 1520 nm~1543 nm for th4e device with 1510 nm/1550 nm WDM coupler. The dependence of operating characteristics on the input signal power is insignificant. However the temperature dependence is ~0.06 nm/
Optcal and thermal diffusion properties of Ge-Sb-Te multi-layered thin films for optical recording media
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 394~400
We studied thermal diffusion properties diffusion properties of multi-layered Ge-Sb-Te alloy thin films for optical recording media by solving the thermal equation. Based on the numerical analysis of optical energy distribution and absorption inside multi-layered films including temperature gradient and heat transfer simultaneously, we proposed the optimum parameters of the input laser power and the multi-layer structure as follow. i) Input laser power is 18 mW, ii) laser exposure time is 60 ns, iii) the thicknesses of the lower and the upper ZnS-SiO
are 140 nm and 20~30 nm respectively, and iv) thickness of Ge-Sb-Te recording film is 20 nm.
An optical channel-switching transmission filter using the segmented chirped fiber Bragg grating
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 401~405
We propose a novel channel-switching transmission filter using segmented chirped fiber Bragg gratings (CFBG's) each of which has separate transmission bands in the reflection spectrum of the CFBG. The segmented CFBG's are made by using specially designed slits. The separated reflection spectral bands of the segmented CFBG's are controlled by the attached fiber stretchers, and the controlled reflection bands are used to choose the channels independently. Tunability of the transmission spectra is experimentally demonstrated in WDM transmission experiments.
Optical coupling between a side polished fiber and planar waveguide including a thin metal film
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 406~413
We report theoretical and experimental results for the wavelength and polarization selectivity of a fiber-to-planar waveguide coupler made of a side polished single mode fiber covered with a planer waveguide incorporating a thin metal film. A simple but exact approach to obtain the modal properties of multilayer planar waveguide with a thin metal film is described. The device was modeled into equivalent 1 dimensional structure and its behaviour was analyzed based on coupled mode theory. The effects of metal film thickness and refractive index of superstrate on the device properties were measured and explained.
Aligning properties of antiferroelectric liquid crystals (AFLC)
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 414~417
Experimentally, the aligned direction of AFLCs in electro-optic cells having both the substrates rubbed along the same direction is skewed by a few degrees from the rebbing direction. To explain why, we proposed "Torsional Rigid Body Model" and interpreted their skewing angle as the action of short pitch with the large shear stress. That is, the azimuthal an anchoring strength (about 35 dyn/cm) in the cell is much larger than the maximum shear stress (about 10
dyn/cm) for the original pitch and so forbids the optic axis to skew. On the side hand, the strength is smaller than the maximum shear stress (about 42 dyn/cm) for short pitch and then allows the optic axis to skew.
A study on aberration and FOV improvement of a holographic HMD element
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 418~424
A holographic HMD element having low aberrations and high diffraction efficiency over wide FOV has been fabricated. In order to design the HOE having low aberrations a recursive technique was used. To obtain the HOE having low aberrations as well as high diffraction efficiency over a wide FOV, we used an intermediate hologram and the grating function of the aberration corrected hologram was transferred to the final hologram through it. For the fabricated final HMD element, we got the results of spot size improved about 10 times and high diffraction efficiency over FOV of
Design of a 3-stack color LCD using color polarizers
Korean Journal of Optics and Photonics, volume 12, issue 5, 2001, Pages 425~428
In this work, we propose a new optical configuration for a 3-stack color LCD using subtract color mixing method. This configuration consists of 3 color polarizers, a neutral polarizer and 3 LC cells. With the proposed configuration, we can increase the contrast ratio practically by using a neutral polarizer and reduce the manufacturing cost. To reduce wavelength dispersion, the sequence of polarizers is optimized.