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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 10, Issue 6 - Dec 1999
Volume 10, Issue 5 - Oct 1999
Volume 10, Issue 4 - Aug 1999
Volume 10, Issue 3 - Jun 1999
Volume 10, Issue 2 - Apr 1999
Volume 10, Issue 1 - Feb 1999
Selecting the target year
A study on the feedback control system for near field scanning optical microscope based on the tuning fork oscillator
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 267~272
We attached a fiber tip on the branch of a quartz crystal oscillator in order to make a feedback control system for near field optical microscope. The electrical impedance of the quartz crystal oscillator depends on the distance between the surface of the sample and the tip caused by the surface damping. Using this method, we can directly monitor the distance between the sample and the tip without inserting extra beam which might give extra optical noise. We characterize the XY scanning resolution and the amplitude of the vibrating tip and the Z-dependent decay of the evanescent wave.
Multiplexed fabry-perot interferometric sensor system
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 273~278
A TDM-multiplexed fiber optic pressure/temperature sensor system utilizing fiber optic Fabry-Perot interferometers as sensing devices was developed and applied to measure water level variations and temperature variations. The maximum measurement speed of the system without saving measurement data is 4500 times per second and the response time of the sensors is thought to be ~ms. The difference between the theoretical value and the measured value for the scale factor of water level sensor and temperature sensor was +13.7%, -18% respectively. The nonlinearity of the sensors after calibration was less than 1%. The sensor system was applied to verify the capability of measuring the temperature variations and water level variations at a high speed.
Design and Fabrication of a Reflective Bistable TN LCD
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 279~282
We designed and fabricated a single polarizer mode bistable twisted nematic liquid crystal display by employing a wide-band λ/4 retardation film to enhance the dark state property. We theoretically and experimentally confirmed the necessity of a wide- band λ/4 retardation film in a single polarizer mode. We obtained brighter image than previous reflective BTN LCDs.
Evaluation of surface roughness using phase-measuring interferometer for a few ten
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 283~288
We investigated the characteristics of surface roughness evaluation using phase-measuring interferometer for a few ten
-rough substrates. The influence of phase averaging and intensity averaging on the roughness measurement by phase measuring interferometer was investigated and the optimal number of phase and intensity averaging for the least measurement error was searched. For a few ten
-rough sample, roughness value did not depend so much on the data averaging. Whereas, measurement error for sub
-rough sample was significantly improved as the number of phase and intensity averaging increased. At the phase averaging of 30 and the intensity averaging of 20, roughness value that measurement error was minimized was obtained, and it was in good agreement with that by optical heterodyne interferometer. Roughness measurement at the optimal data averaging showed also good repeatability error less than 0.01
Measurement of the nonlinear optical susceptibilies of porous silicon
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 289~293
The nonlinear susceptibilities of the porous silicon surface were determined from the second harmonic generation. The value of nonlinear susceptibility,
esu which had an intensity of two orders of magnitude greater than that of silicon crystal wafers. The orientation angle of absorbed molecules on the porous silicon surface was
Analysis of wavelength conversion by highly nondegenerate four-wave mixing in a semiconductor optical amplifier
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 294~300
The density matrix is solved more rigorously, compared with the third-order pertubation method used in the conventional theory, for a semiconductor laser amplifier. Then the coupled wave equations are derived to explain the wavelength conversion due to the spectral hole burning in the semiconductor optical amplifier. It is shown that our results can explain the effect of saturation of the population density on the electric polarization, which affects the four-wave mixing and wavelength conversion, better than the conventional theroy where the third-order pertubation is used.
Second harmonic generation of YCOB(
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 301~305
The phase matching conditions of the new optical crystal grown by Czochralski pulling method, YCOB(
) with wavelength were suggested, and the second harmonic generation efficiency for the fundamental of Nd:YAG laser of 1064 nm was investigated. The variation of nonlinearity with rare earth ion doping was also investigated by measuring the second harmonic generation efficiencies of
and ion doped YCOBs.
Intersubband absorption in strained Si(110)/SiGe multiple quantum wells
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 306~310
Electron intersubband absorption in Sb
-doped Si(110)/SiGe multiple quantum well structures is observed. Normally incident light can excite electrons in Si(110) quantum wells, which is not possible for Si(001) or GaAs quantum wells. The influence of Ge composition in SiGe barries is investigated. As the Ge composition in SiGe barriers increases, the absorption strength is decreased and the transition energy is increased. It is verifired by comparing the calculated and experimental results obtained at various incident and polarization angles that normally incident light and parallel incident light are absorbed in different processes.
Unidirectonal single-mode operation of a Nd:YAG laser by using a planar semimonolithic ring cavity
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 311~317
Unidirectional single-mode operation of a diode-pumped Nd:YAG laser with a planar semimonolithic ring cavity has been demostrated at 1064 nm. The semimonolithic cavity consists of a laser active medium placed in a magnetic field, a crystal quartz plate, and an output coupling mirror. They form an optical diode by acting each part as a Faraday rotator, a reciprocal polarization rotator and a partial polarizer, respectively. An eigenpolarization theory for the cavity configuration was presented and losses for the eigenmodes were calculated. A pump-limited single-mode output power of 155 mW and a slope efficiency of 17% were obtained when the laser was pumped by a 1.2 W, 809 nm diode-laser. A laser linewidth of less than 100 kHz is inferred from a beat note frequency spectrum between two identical laser systems and continous single-mode tuning range was more than 2 GHz.
Optical properties of
complexes for liquid laser material
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 318~322
Perdeuterated hexaflouroacetylacetonato-neodymium [
] complexes were synthesized by the keto-enol tautomerism reaction of
in order to reduce the radiationless transition to the ligands. The emission properties of
complex were measured in the following anhydrous deuterated organic solvents;
, and these properties depended on the coordination ability of solvent molecules. The intensity and lifetime of the emission in dimethysulfoxide (DMSO-
) were superior to those in other in other deuterated solvents. It was suggested that the anhydrous
might be the most appropriate solvent for the liquid laser material of
Full Color image generation using binary phase holograms
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 323~327
In this paper, the novel and simple scheme of producing full color image bye use of binary phase holograms and three lasers of red (632.8 nm), green (543.5 nm), and blue (488 nm) is presented. Three holograms are designed and fabricated separately so that different laser beams can pass through the different holograms. The diffracted beams from the holograms constitute the wanted color image at the focal plane. The theory and experimental results of the system are also presented.
Grating phase measurement of photopolymer hologram by self-diffraction oscillations
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 328~334
Methylene blue-sensitized photopolymerizable material based on acrylamide is investigated with two-wave energy coupling experiments. Differently from other studies, self-diffraction oscillations are observed and the grating phase is determined without applying external electric fields, moving nonlinear materials, and phase shifting one of two writing beams. The phase grating showed a phase shift of
with respect to the intensity grating. Modified Kogelnik's coupled wave equation considering the mixed gratings of phase and absorption gratings and nonzero spatial phase shifts of the gratings with respect to the intensity interference patterns formed during the two-wave energy coupling is discussed in detail to understand these phenomenon.
Photochemical bleaching properties of photopolymer
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 335~341
We fabricate acrylamide photopolymer as a holographic recording material and investigrate photobleaching characteristics. To explain the photobleaching kinetics of photopolymer we adopt two models of the Beer-Lambert law and optical transmittance based on rate equations obtained from a simplified energy-band model. The Beer-Lambert law is in good agreement with the experimental results in a first short-time region but not in long-time region. But the optical transmittance model based on rate equations explains the experimental results very well in both short-and long-time regions.
AWG device characteristic dependence on the fabrication error limit
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 342~347
As the waveguide width and the radius of curvature get smaller for the effort of monolithic fabrication of integrated photonic devices, the waveguide characteristics change significantly according to the change of the waveguide width or the radius of curvature. Especially, variation of the waveguide width due to fabrication process errors induces a phase error for each waveguide from the change of the propagation constant. Therefore, it is important to quantify these variation effects on the device characteristics for the design and fabrication of highly integrated photonic devices. Here, we analyze four different types of waveguides to get general characteristics in propagation constant change by utilizing the effective index method and the analytic solution method. Futhermore, the output characteristics of two AWG(Arrayed Waveguide Grating) devices are simulated by a highly-functional computer code. The simulated results have been found to be similar to the realistic device characteristics. The required fabrication error limit for the ridge-type InP-AWG device should be smaller than 0.02
to get better channel crosstalk than-25 dB, while the required fabrication error limit for rib-type silica-AWG devices may be allowed up to 0.1
to obtain better crosstalk than -30 dB.
Ray-optical determination of the coupling coefficients of waveguide gratings by use of the rigorous coupled wave theory
Korean Journal of Optics and Photonics, volume 10, issue 4, 1999, Pages 348~353
Ray-optics approach based on the rigorous coupled wave theory, called by the rigorous ray-optics method (RROM), is developed for the calculation of couling coefficients of waveguide grating devices. The coupling coefficients of several grating structures, such as rectangular, sinusoidal, triangle, and trapezoidal shapes, are determined by the RROM, and they are compared with those obtained by conventional methods of the ray-optics method (ROM) and the coupled mode method (CMM). In the case of rectangular gratings, the coupling coefficients is evaluated in detail by various depths and duty-cycles of the grating. We have found that the RROM gives more exact solutions for the coupling coefficients of even arbitrary shapes of diffractive waveguide grating devices than the other conventional methods.