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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 7, Issue 4 - Dec 1996
Volume 7, Issue 3 - Sep 1996
Volume 7, Issue 2 - Jun 1996
Volume 7, Issue 1 - Mar 1996
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Gaussian apodization and superresolution optical imaging system for soft X-ray region
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 89~95
Superresolution optics, employing Gaussian apodization, is rigorously treated at the soft X-ray wave-length(λ=0.013
) region. In the diffraction integral, the line integral along the imaginary axis is found small, and it is ignored, so that the diffraction integral consists of the integration along the real axis. The resolution of the diffracted image is not effected by the pupil angular frequency bandwidth
, which is one of the most important the characteristic features of Gaussian apodization (
optics. The superresolution optics has resolution (
m which is smaller than the Rayleigh criterion of 2λ=0.026
for NA=0.25. The optical system has
, which gives the peak intensity of the diffracted image larger than
times intensity obtainable by the infinite sperture.
Characteristics of dichromated gelatin holographic combiner derived from Agfa 8E75 HD film
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 96~100
Agfa 8E75 HD film is used to fabricate a film-type dichromated gelatin holographic combiner. The swelling factor of gelatin is controlled to increase the refractive-index modulation of hologram during the pre-processing steps. The characteristics of the reconstructed wavelength and the angular bandwidth are compared with those obtained with Kodak 649F plate.
Active auto-focusing of high-magnification optical microscopes
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 101~111
Optical microscopes integrated with CCD cameras are widely used for automatic inspection of precision circuit patterns fabricated on glass masks and silicon wafers. For this application it is important to position the object always is focus so that the image appears in good quality while the microscope scans the object. However, as the magnification of the microscope is taken large for fine resolution the depth of focus becomes small, often in submicron ranges, requiring special care in focusing. This study proposes a new auto-focusing method, which can be readily incorporated in existing optical configuration of microscope. This method is based on optical triangulation using a separate beam of laser and two photodiodes, eliminating focus errors caused by surface roughness and waviness. Experimental results prove that the method can produce focus error signals which are very sensitive with a resolution of 5 nm within 0.5
TM polarized photon tunneling in a frustrated total internal reflection structure
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 112~119
TM polarized photon tunneling time and the position where TM photons appear after two-dimensional tunneling in a frustrated total internal reflection (FTIR) structure are calculated. This is done by converting the FTIR tunneling problem of TM photons to an electron tunneling problem with a position-dependent effective mass for a heterostructure potential barrier. Derived results are compared with TE photon cases.
Intrared-to-visible upconversion in
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 120~128
We studied the red, green and blue upconverted emission in 1 at.%
and 1 at.%
crystals y pumping in 780~820 nm range at 14 K and 295 K. A cw titanium-sapphire laser was used to pump the
level in two materials. The spectral analysis of the emission from
levels allowed to reveal the upconversion process with multi-step absorption and cross-relaxation energy transfer.
Phenomenon of the absorptive optical bistabililty in amorphous
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 129~135
We observed the absorptive optical bistability in the single layer amorphous
thin film which has an isolated electron pairs at roomtemperature, for the frist time,
laser beam (λ=514.5 nm) was used as a light source and was focused by thin lens. The experiment was performed in cavityless system and the occurrence of optical bistability in this material could be explained by the temperature-dependent absorption coefficient of the sample. Also, this effect was explained by the reversible shift of the absorption edge in this material. The condition of optical bistability is determined by detuning value (
) and this value was 0.12 when thikness of that sample was about 0.8
. The switching was observed clealy when light intensity is 150~180 mW and the swiching time was about
Nonlinear guided-wave properties in planar waveguides with two nonlinear bounding thin films
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 136~141
We present a novel description of TE nonlinear guided waves in planar waveguides with two nonlinear bounding thin films. The nonlinear dispersion relations of the nonlinear waveguides are obtained by adopting the nonlinear transfer matrix. The optical properties obtained from these equations include: the power dependence of mode indices, the transition of the field maximum location, and the power distribution. The planar waveguide with self-focusing nonlinear layers shows the optical bistability of power-dependent mode indices, and the critical powers for the optical bistability increase with decreasing thickness of the nonlinear layers. The power distributions display the optical bistabilities, similar to those of nonlinear Fabry-Perot etalon.
Measurement of OH radical spectrum in counterflow burner using degenerate four wave mixing
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 142~149
In non-saturation region, we measured the degenerate four wave mixing spectra of
transition for OH in counterflow burner, which exists transiently in combustion reaction. We used forward box type geometry for phase matching. Calculating the population of each rotational level from the line intensities of R
band and comparing it with Boltzmann distributions, we could obtain the temperatures of the flame at several points. Corrected for the absorption of incident laser fields, the final temperatures coincided with those measured by coherent anti-Stokes Raman Scattering within error
60 K near 2000 K. We also measured the concentration distribution of OH radical and it was compared to that measured by laser induced fluorescence.
The fabrication of InGaAsP/InP RWG(ridge waveguide) MQW-LD by the vertical LPG system
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 150~156
RWG MQW-LD has been made with our vertical LPE system from the optimal design condition for the RWG MQW-LD to be activated as weakly index-guided LD. Through several experiments we have established the growth condition which can be used through to grow the MQW-DH wafer and to control the thickness of MQW layer to ~200
-thickness of the ridge pattern has been formed through the photolithographic process on the MQW-DH wafer grown by the former condition, and then we have fabricated the RWG MQW-LD using it. From the result of measuring the electro-optical characteristics we can make sure that it can be lasing as lasing as laterally single mode at even more than
Laser doppler velocimeter using the self-mixing effect of a
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 157~161
A simple laser Doppler velocimeter(LDV) using a
laser with its self-mixing effect has been developed. We measured the laser power which was modulated by Doppler frequency, when monochromatic laser light was focused to a moving target. The Doppler-shifted frequency was controlled by changing rotating speed of the turntable or the cosine of the angle between the direction of the laser beam and that of the rotating velocity.
Fiber optic interferometric electric field sensor with La-doped PMN/PT PMN/PT[0.9 Pb
] electrostrictive ceramics
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 162~166
We report a fiber optic interferometric electric field sensor that utilizes electrostrictive ceramics-1%, 2%, 3%, La-doped 0.9MN/0.1PT, respectively-as the transducing elements. It is also experimentally observed that 3% La-doped PMN/PT among the three elements has the largest electrostrictive coefficient
at 3.38 kHz and displays small hysteresis. The optical fiber sensor with the 3% La-doped PMN/PT exhibits minimum detectable field of 2.08(V/m)/
and has a good linearity over the dynamic range 40 dB.
Bias-voltage-dependent dynamic behavior of a STN LCD
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 167~173
In this paper, the voltage dependence of the dynamic characteristics in a STN LCD is investigated. From the measurement of the switching times for four STN LC cells under various applied voltages, it was found that the analytical equation for the switching times has a fixed proportional constant irrespective of sample parameters. We also investigated the dependence of the switching times on the bias voltage. Our theoretical results were in good agreement with above experimental results.
Construction of AC calorimeter and measurement of thermal diffusivity of glass substrate coated by ZnS optical thin films
Korean Journal of Optics and Photonics, volume 7, issue 2, 1996, Pages 174~180
For the investigation of the influence of microstructure of optical thin films on the in-plane thermal diffusivity of glass substrate coated by that films, we constructed the AC calorimeter which uses argon-ion laser as a thermal source and measured several kinds of ZnS optical thin films which prepared by the changing of thermal evaporation speed such as 5
/s. The result showed that the thermal diffusivity decreases as the temperature increases. Also, when the evaporation speed is 20
/s, the thermal diffusivity has maximum value, and the variation of the thermal diffusivities are 27% at maximum.