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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 11, Issue 6 - Dec 2000
Volume 11, Issue 5 - Oct 2000
Volume 11, Issue 4 - Aug 2000
Volume 11, Issue 3 - Jun 2000
Volume 11, Issue 2 - Apr 2000
Volume 11, Issue 1 - Feb 2000
Selecting the target year
Effect of local field on atomic systems I : Derivation of interaction hamiltonian in electric dipole systems
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 1~5
We define the basic minimal coupling Hamiltonian of the atomic systems in the Coulomb guage and show that this Hamiltonian yields the correct equations of motion for the operators of interest. Using the unitary transformation and making the dipole approximation, we calculate the effect of polarization of the dipoles on the interaction Hamiltonian of the system. ystem.
An optical design of a high resolution earth observation camera for small satellites
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 6~12
A space-borne earth observation camera is an electro-optical instrument to measure the characteristics of the earth's surface, and to transmit the measured data to a ground station(s). The specifications of a space-borne camera, such as resolution, swath width and observation bands, are determined by its mission objectives. This paper lists some specifications of a camera suitable for small satellite and then presents an optical design, with the results of tolerancing analysis, which satisfies the given specifications. tions.
The preparation of
thin films by reactive RF sputtering method
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 13~18
The SiOxNy thin films were prepared on Si(lOO) by reactive RF sputtering method. The reactive gas ratio and the power were used as parameters for depositing SiOxNy thin fims. The properties of
thin tilms were investigated by XRD, XPS, refractive index and extinction coefficient analyzer (n'||'&'||'k analyzer), and FfIR. It was found by the results of the x-ray diffraction measurement that SiOxNy thin films were grown to an amorphous structure. From the results of the XPS, and the n'||'&'||'k analyzer, it was found that refractive index was intended to increase with the increasement of the relative nitrogen contents of the
The improvement of viewing angle characteristics of BTN LCD by using a optical retardation film
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 19~24
Optical transmission characteristics of retardation film for obliquely incident light is calculated by using extended Jones calculus and it is geometrically interpreted on Poincare sphere representation as rotational transformation. The characteristics of a retardation film is that while the rotation axis is fixed at a point on the Equator of the Poincar sphere, the rotation angle varies with the direction of incidence. This property can be compensated by using a tandem arrangement of the two optical films whose optic axes do not coincident, and this method can be used for the improvement of the viewing angle characteristics of BTN cells. cells.
Enhanced nonlinearity of nonlinear optical side-chain polymers
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 25~32
Comparisons are made between the first hyperpolarizability
of pure N-(4-nitrophenyl)-(L)-prolinol (NPP) and poly (methyl metacrylate) (PMMA) or poly-p-(phenylene terephthalates) (PPT) with NPP side group determined with two different methods, electric-field-induced second-harmonic generation (EFISHG) and hyper-Rayleigh scattering (HRS) methods. Both techniques yield the same values within the experimental errors for pure NPP and NPP-PMMA in 1,1,2,2-tetrachloroethane solution. But the measured results of NPP-PPT polymer in 1,1,2,2-tetrachloroethane solution are showing that the first hyperpolarizability was enhanced with an enhencement of a factor 9.7 in EFISHG and a factor 2.4 in HRS relative to pure NPP. These results indicate that nonlinear optical chromophores organized as side groups of polymers with a rigid backbone contribute coherently to the secondorder nonlinear response of the polymer in the dc electric field as polar polymer chains. hains.
PLC-Type WDM directional coupler and the effect of wavelength shift by UV irradiation
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 33~36
KrF excimer laser, which is useful for fabrication of fiber gratings, was irradiated on the PLC-type WDM directional coupler and the transmission wavelength shift was observed as a function of UV exposure time. The effective refractive index change of rectangular silica waveguide was calculated from the wavelength shift measurement and the coupled mode theory. heory.
Nonlinearity of semiconductor optical amplifier and gain-clamping effects of Iaser-injected semiconductor optical amplifier in wavelength division mulitiplexing
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 37~42
We have numerically solved rate-equations of semiconductor optical amplifier (SOA) to understand the characteristics of SOA. The rate-equations we have used can describe injection carrier density, amplified spontaneous emission and signal photon density in spatial and time domain by dividing the cavity into multi-section. We have investigated injection carrier density, amplified spontaneous emission and signal photon density as a function of position and time in the case of single channel input in the form of square pulse. Also we have analyzed the non-linear phenomena of SOA in the case of injecting multi-channel wavelengths as in WDM. Intermodulation distortion (IMD) caused by beat among channels has significant effects on the signal distortion as the channel spacing becomes narrower, and channel crosstalk becomes larger as the power of signals increases. In the case of the injection of another CW laser whose wavelength is far enough from the signal wavelengths, the crosstalk and the output signal distortion can be significantly reduced. duced.
Generation of sub-10-fs Pulses from a kerr-Iens mode-locked Ri:sapphire Iaser
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 43~46
We generated 9-fs pulses from a Kerr-lens mode-locked Ti:sapphire laser only using commercial optical components. Two sets of prisms pair made of fused silica were used to compensate group delay dispersion inside and outside the laser oscillator respectively, and broadband mirrors were used to obtain a broad spectrum. By comparison between reflectance curves of the broadband mirrors and those of previous ones, broadband mirrors which have high reflectance bandwidth of over 180 nm were found to be essential to produce sub-IO-fs pulses. ulses.
Design of phase-only diffractive pattern elements using a two-stage iterative Fourier transform algorithm
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 47~57
A two-stage iterative Fourier transform algorithm, based on hybrid input-output algorithm and new Pnoise algorithm, is used to design continuous and quantized phase-only diffractive pattern elements which produce arbitrary given intensity patterns via Fraunhofer diffraction. Numerical results for two
binary patterns and two grayscale patterns are compared with those of other algorithms. It is found that the algorithm yields better signal-to-noise ratio and even better uniformity with slightly lower diffraction efficiency than other algorithms. We investigated the dependence of performance on parameters used in the algorithm, size of noise region, and the number of phase levels for quantized elements. In the case of quantized phase elements, the size of noise region plays a greater role in determining the performance of the algorithm than given intensity pattern itself. tself.
Area storage density of ideal 3-D holographic disk memories
Korean Journal of Optics and Photonics, volume 11, issue 1, 2000, Pages 58~64
Assuming that the performance of holographic storage media is ideal, we estimate the area storage density of disk-type holographic memories, when the method of either angle multiplexing, or rotational multiplexing, or both are used. The area storage density is strongly dependent on the f numbers (ratio of focal length to diameter) of both the Fourier transform lens in the signal arm, denoted by
, and the angle range over which the reference beam is incident (or, the equivalent f number corresponding to the angle range denoted by
). The area storage density is largely independent of the pixel pitch of the spatial light modulator when the Fourier plane holograms are recorded, while it is sensitive to the pixel pitch when the image plane holograms are recorded. In general, to obtain high area storage density, the Fourier or at least near Fourier plane holograms rather than the image plane holograms should be recorded. In addition, when the thickness of the recording materials are less than approximately
, rotational multiplexing gives higher area storage densities than angle multiplexing does. To increase the storage density further, however, it is desirable to use both of the two multiplexing methods in combination.nation.