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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 3, Issue 4 - Dec 1992
Volume 3, Issue 3 - Sep 1992
Volume 3, Issue 2 - Jun 1992
Volume 3, Issue 1 - Mar 1992
Selecting the target year
Determination of Optical Constants and Observation of Patterns of Dielectric Thin Films Using Surface Plasmon Resonance
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 205~216
Distribution of electric fields of surface plasmons at resonance and off-resonance angles were calculated and compared. As applications of surface plasmon resonance, (1) optical constants of ZnS films overcoated on Ag films were measured as the thickness of ZnS films increased, (2) four surface plasmon resonances distributed spatially due to the different thickness of SiO thin films overcoated on Ag films were observed in a picture frame by employing diverging waves of incidence, and (3) patterns of SiO thin films such as a grating and a character "가" overcoated on Ag films were measured by employing collimated waves of incidence.
Micro lens system design for the optical fiber communication
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 217~221
A micro lens system was designed for the modulator in optical fiber communication. One was the collimating lens which transferred the diffracted beam from optical fiber to the modulator. The other was the coupling lens which connected the modulated collimating beam to the optical fiber. The light source was He-Ne laser beam. The lens would be made of optical glass BK-7. We determined the tolerance of curvature radius, thickness and conic constant.
Investigation on the lasing characteristics of an
laser-pumped Nd:glass laser
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 222~226
The lasing characteristics of a Nd:phosphate glass laser pumped by 514 nm of an
laser has been investigated. The oscillator consists of a Nd:glass gain medium set at Brewster angle, and two concave mirrors, and a flat mirror with a reflectance of 98%. The
laser pumping beam is focused longitudinally at the beam waist of laser mode for efficient pumping. The pumping beam is chopped at 100 Hz to reduce the heat loading to prevent the thermal damage of the gain medium by the latent heat from the absorbed pumping beam. The maximum laser output power of 70 mW at 1.5 W pumping and the threshold input power of 520 mW have been obtained.
Study on the properties of temperature distribution at the split-disk geometry glass laser amplifier
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 227~233
The simulation code was developed for the development of the split-disk geometry glass amplifier, which could design the laser apparatus and analyze the properties of the laser system. The flashlamp emission energy at the short wavelength region must be reduced, while maintaining a current density between 2000 and 4000 A/
, in order to reduce the thermal loading in the laser glass and to raise the coupling efficiency between the emission spectrum of the flashlamps and the absorption spectrum of the laser glass. By cutting the laser glass into three equal pieces, the temperature rise in the laser glass dropped by 70% due to the efficient removal of the heat in the laser glass. It was found that the
doping rate of each laser glass should be properly selected and the optimum value of the product of the absorption coefficient
and the thickness d of the laser glass is about 0.26 in the split-disk geometry.
Operating Characteristics of a Waveguide
Laser Excited by 13.56MHz and Additional Xe Effect
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 234~238
A sealed-off waveguide
laser with a length of 50 cm and a cross-sectional area of
has been designed and constructed. The laser is transversely excited by RF (13.56 MHz) discharge. Output characteristics of the laser has been investigated performing variations of total gas pressure, input rf power, and mixing ratios of gases. The maximum output power of 9.5 W was obtained under the condition of total gas pressure of 50 Torr, input rf power of 180 W, and gas mixture of 6 : 1 : 2 : 1 of
Study on the Interference Phenomena of Nonlinear Optical Signals
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 239~243
We have investigeted the interference phenomena of the second harmonic waves of Nd:YAG laser generated at KDP single crystals and the nitrogen CARS signals. To get the phase difference between the successively generated nonlinear optical signals, a phase shifting unit made of BK-7 glass and a high pressure gas cell are used. Coherence lengths of several samples for the nonlinear signals are measured. Adjusting the thickness of the phase shifting unit where the CARS signals make destructive interference completely, the CARS spectrum of nitrogen suppressed over wide wavelength range is obtained. Also, we have observed the change in degree of suppression of the spectrum for the variation of the thickeness of the phase shifting unit.
Tunable bragg filter of
waveguide using thermooptic effect
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 244~251
Buried Bragg filters of single mode
rib waveguide with a cover layer of
and grating at the interface of
are designed and fabricated. Etching of the grating on
waveguide core by buffered HF showed uniform etching with good control up to 1 nm. This buried type of Bragg filters are immune to contamination of the surface of device. The mode index and bandwidth of filters are determined by measurements of the transmission spectrum of Bragg filters and compared with that of calculation. Waveguide Bragg filters loaded with the micro-heater of Cr film and the cladding of silicone rubber are made to control the Brag wavelength of the filter. As a result the filter wavelength of the device moved by 0.41 nm for 10 mA current to the shorter side of wavelength proportional to the square of the current.
A study on the InGaAsP/InP MQW-LD fabrication by the liquid phase epitaxy
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 252~257
In this study, InGaAsP/InP MQW-DH wafer was grown by a vertical type LPE system and 10
m stripe MQW-LD was fabricated with the wafer. The threshold current was about 200 mA and when the cavity length of the LD was 470
m the central wavelenth of gain spectra was 1.32
m the lasing wavelength was 1.302
m which corresponded to the gain center of the quantum well thickness of 300
Fabrication and loss measurement of
optical waveguides on Si
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 258~265
A low loss optical waveguide of
on Si substrate is produced by using the chemical vapour deposition method of
thin films used in Si technology. Propagation loss of the waveguide layer was 1.65 dB/cm as produced and reduced down to 0.1 dB/cm after heat treatment at
. By using laser lithography and reactive ion etching method
waveguide was produced and subsequently annealed at
.As a result of this annealing the shape of the waveguide core was changed from rectangular to semi-circular form, and the propagation loss was reduced as down to 0.03 dB/cm at 0.6328
m and 0.04dB/cm at 1.53
m. We think that the mechanism of the reduction in propagation loss during the heat treatment is the following: 1) The hydrogen bonding in waveguide layer, which causes absorption loss, is dissociated and diffused out. 2) The roughness of the interface and the micro-structure of the waveguide layer is removed. 3) The irregularities in the cross-sectional shape of the waveguide which was induced during the lithographic process were disappeared by flowing of the waveguide core.
Study on Coherent Anti-Stokes Raman Spectroscopy for Measuring Temperature Profile in a Flame
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 266~272
A coherent anti-Stokes Raman spectroscopy (CARS) technique is applied to measure temperature profile in a flame. The CARS signal is obtained with BOXCARS phase matching to get better spatial resolution. A program routine for calculating temperature of the flame from the measured CARS spectra is studied. The routine includes the line broadening mechnism of the molecules described with a modified energy gap (MEG) law by using the perturbation theory. We have found that the temperature profile obtained with the MEG law is properly fit with the results measured with a thermocoulpe and calculated with the adiabatic theory.
Development of Optical NC-Scales Fabrication Process
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 273~279
Position reading devices such as optical encoders are most essential components in numerical control (NC) machines and robots. Fabrication process of optical NC-scales was developed for domestic production. The whole process using photo-lithographic techniques consists of about 10 steps. The process parameters were to be carefully determined through many trial experiments. The scale marks of metal film was printed on a glass substrate. The optimum values of various process parameters were extrilcted. The quality of scale marks was attributed to the each process parameters.
Semiconductor nonlinear optical spectroscopy
Korean Journal of Optics and Photonics, volume 3, issue 4, 1992, Pages 280~287
The nonlinear optical properties of semiconductors and semiconductor microstructures have been the subject of intense research, not only from a fundamental physics point of view, but also for their potential applications to future opto-electronic devices. In this paper, steady-state and time-resolved nonlinear optical spectroscopic techniques to investigate the microscopic world of semiconductor materials were briefly described.