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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 8, Issue 6 - Dec 1997
Volume 8, Issue 5 - Oct 1997
Volume 8, Issue 4 - Aug 1997
Volume 8, Issue 3 - Jun 1997
Volume 8, Issue 2 - Apr 1997
Volume 8, Issue 1 - Feb 1997
Selecting the target year
Amplitude impulse and superresolution of interferometric imaging system obtained by superposing three Gauss pupils
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 1~6
The amplitude impulse S(x) of an interferometric optical imaging system for λ=193 nm(ArF laser) and NA=0.5 is derived for the pupil with superposed three Gauss pupils
). It is shown that FWHM of S(x) can be far less than the Rayleigh's criterion of resolution
is equal to λ=193 nm in the present case of NA=0.5. The three Gauss pupils are provided in an optical system which consists of a Twyman-Green interferometer and an imaging system. The system is proposed and relevent optical components are discussed. Siloxane polymer is suggested for fabrications of amplitude modulation plates. In the present work, we assumed the system is free from aberration and linear. The case that the system has residual aberrations is important, and further work is necessary.
Automation of an OTF measurement system using a fishtail edge
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 7~13
This paper describes the automation of an object generator and an image analyser in a knife scan OTF equipment to enhance the accuracy of OTF measurement. Pinholes and slits of various size in the object generator are used as an objects. A fishtail edge is mounted to the image analyzer and is translated to the direction of 45 degree angle with the horizontal to measure MTF simultaneously in the radial and tangential azimuths. The stepping motor control unit and software for the image analyzer are modified and the accuracy of this equipment is evaluated by measuring the OTF of SIRA group 50 mm standard lens.
Strain analysis of cantilever beam under eccentric force using holographic interferometry
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 14~18
Using holographic interferometry, strain distributions for a cantilever beam subjected to the eccentric force can be analysed. Holographic fringe pattern shows inclined straight lines for the composite deformation of bending and torsion. Using these inclinations of the fringe pattern, 3rd order polynomial of plane displacements can be determined without difficulty. As the result, both of axial and shear strain distribution can be obtained from the second partial derivatives of this polynomial. These results agree well with FEM.
Fabrication of holographic zone plate using dichromated gelatin hologram
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 19~25
Holographic zone plate (HZP) is fabricated by interfering a plane wave and a spherical wave in a dichromated gelatin (DCG) film obtained from Agfa 8E75HD plates. We have developed a simple theory for HZP considering optical nonlinearity of DCG material. Analysis of our theory for HZP shows that it has infinite focal points at distances f,f/2, f/3,,…. In experiment, we observed the corresponding focal points of up to f/6 when illuminating HZP by a plane wave. It is also shown that the beam profile around the first focal point measured by using a knife-edge scanning method has a Gaussian shape.
Measurement of the effective optical thickness of optical media using intermode beat interferometer scheme
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 26~30
A wide dynamic range heterodyne interferometer scheme using intermode beat between a stabilized, dual frequency He-Ne laser beam has been applied for a measurement of optical thickness of an optical medium. Resolution of the optical thickness measurement is about
. Using this technique, we are able to determine the optical thickness of an organic dye film. We also obtain a map of the optical thickness variations over a surface of the film
Measurement of a refractive index and thickness of silicon-dioxide thin film on LCD glass substrate using a variable angle ellipsometry
Pang, H. Y. ; Kim, H. J. ; Kim, S. Y. ; Kim, B. I. ;
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 31~36
We measured refractive indices and thicknesses of SiO
thin films that have been plated on LCD glass substrate for the purpose of preventing the out-diffusion of sodium ions. The best experimental condition to determine refractive index and thickness of SiO
thin film by using ellipsometry is searched for, where ⅰ) the film thickness is increased uniformly by 20
to the period thickness while the angle of incidence is fixed and ⅱ) the angle of incidence is increased uniformly by 1
while the film thickness is fixed. We estimated the errors in determining the refractive index and thickness by comparing the measurement error of
and Ψ with the calculated one. The ellipsometric constants of SiO
thin film on LCD glass substrate are measured at several angle of incidence around the Brewster angle, which is the best angle if the experimental error of ellipsometer is not sensitive to the incident angle. Also the best fit refractive index and thickness of SiO
thin film to these ellipsometric constants measured at several angle of incidenc eas well as the best fit ones to the SE data are obtained using regressional analysis.
A study on the improvement of optical, structural properties and environmental stability of ZnS optical thin films prepared by ion-assisted deposition
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 37~41
The optical property, the environmental stability and the crystallization of ZnS thin films prepared by ion-assisted deposition (IAD) were investigated and compared with those of conventional electron-beam deposited thin films. The humidity(R.H. 85%) test and the thermal(15
) show that the IAD films have relatively higher refractive index, smaller extinction coefficient and environmentally more stable than the conventional films. It is believed to originate from the reduced adsorption of moisture which reflect the increased packing density and the improved microstructure by ion bombardment. XRD experiments also confirm that conventionally grown films have an amorphous in comparison with the crystalline structured IAD films.
Fabrication of computer-interfaced photon counter for single molecule detection in solution
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 42~46
In order to acquire the fluorescence burst signals emitted from single dye molecules that pass through a detection space defined by a confocal microscope, a computer-interfaced photon counter has been fabricated. The maximum count rate is about 80 MHz, which is limited by the counter devices used. Using both the operating computer program written by BASIC and the 486 PC computer, the minimum bin-width of 25
has been achieved. The characteristics of fluorescence burst signals emitted from JA22 molecules at about 1
mol/L in ethylene glycol are discussed briefly.
The CW lasing characteristics of a Cr:LiSAF laser pumped by semiconductor lasers
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 47~51
A Cr:LiSAF laser pumped by semiconductor lasers was constructed. The pumping laser was a high-power semiconductor laser (SDL 7432-H1) of wavelength 674 nm and maximum power of 500 mW. The laser crystal was a Cr:LiSAF of plano-Brewster shape with 3% Cr3+ion concentration and 3 mm in length. The plane facet of the crystal was coated to get the maximum transmittance of pupmping laser and maximu reflection over the 800 - 880 nm bandwidth. V-shaped resonator was used to compensate the astigmatism induced by the crystal. The output power of the Cr:LiSAF laser was 19.4 mW at the pumping power of 290 mW. The wavelength was tuned by a steep dive-angled birefringent filter from 840 nm to 880 nm and the characteristics of the filter were agreed well with a theory.
The effects of asymmetry parameter in a two-mode laser output
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 52~57
We report an investigation of the statistical fluctuations of the two-mode laser output as the asymmetry parameter is varied. The above results relate to computer solutions of the coupled Langevin equations both with and without pumping fluctuations. We find that as the asymmetry parameter is changed positively, the mean intensity of one mode is increased because the normalized intensity auto-correlation is decreased so that the natural dwell time is lengthen. The laser output does respond to a sinusoidally injected asymmetry parameter for small pump parameter.
All-optical gain control in erbium-doped fiber amplifier using a fiber grating
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 58~62
A new, simple lasing loop configuration employing a fiber grating was proposed and demonstrated for all-optical gain control of erbium-doped fiber amplifier. The lasing loop was designed such that the fiber grating acts as a notch filter to cutoff the lasing light as well as selects the lasing wavelength. The operating gain was clamped to the same level as the loop loss and it could be varied with a tunable directional coupler in the loop. It is believed that this type of gain-controlled erbiumdoped fiber amplifier can have several advantages when used in wavelength-division-multiplexed transmission systems.
Polarization dependency of four-wave mixing effect on equal spaced multichannel optical transmission system with dispersion shifted fiber
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 63~67
We have experimentally investigated the fiber four-wave mixing effect on equal spaced multichannel optical transmission system with dispersion shifted fiber. To reduce the fiber four-wave mixing effect, we set the polarization states of the adjacent channels to be orthogonal each other by using polarization controller. In this case, we can reduce the transmission power penalty by 1.5 dB compared with that of equal polarization states.
Equi-spaced multichannel stabilization with a reference frequency from (
) molecules and optical fiber fabry-perot filter
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 68~72
Using one of the absorption lines of
molecules near the zero dispersion wavelength(1549.49nm) of dispersion shifted fiber, we stabilized center frequency of an optical fiber Fabry-Perot filter. The free spectral range of the filter is 100 GHz for 100 GHz channel allocation. For equi-spaced three channel multiplexing, channel locking of three DFB-LDs to transmission peaks of the fiber Fabry-Perot filter was tried. To investigate the effect of dithering current applied to each DFB-LD, the change of DFB-LD linewidth was measured.
Analysis of focus error signals on land/groove recordable optical disks
Korean Journal of Optics and Photonics, volume 8, issue 1, 1997, Pages 73~79
We analyzed the variation of the focus error signal with the effect of land and groove, wavefront error, and optical system parameter variation for the knife-edge and astigmatism methods on the Land/Groove recordable optical disc, using a numerical simulation method. We verified causes of the zero-cross-shift that took place by the effect of land and groove by analyzing the diffraction beam including defocus wavefront errors. We also found that the sensitivty of the focus error signal was reduced by the effect of land and groove in the astigmatism method, as in the analysis of the focus error signal with the each order of the diffraction beam.