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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Optical Society of Korea
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Optical Society of Korea
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Volume 1, Issue 2 - Sep 1997
Volume 1, Issue 1 - Mar 1997
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Multiple light diffraction theory in volume gratings using perturbative integral expansion method
Jin, Sang-Kyu ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 67~73
DOI : 10.3807/JOSK.1997.1.2.067
Light wave diffraction from multiple superposed volume gratings is inestigated using a perturbative iteration method of the integral equation of Maxwell's wave equation. The host material and index gratings are anisotropic and non-coplanar multiple volume gratings are considered. In this method, the paraxial approximation and lack of backward scattering in conventional coupled mode theory are not assumed. Systematic analysis of anisotropic wave diffraction due to multiple noncoplanar volume index gratings is performed in increasing level of diffraction orders corresponding to successive iterations.
Telephotolens design with refractove/diffractive hybrid lens
Hong, Young-Ghi ; Kim, Sun-Il ; Yeo, Wan-Gu ; Lee, Chul-Koo ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 74~80
DOI : 10.3807/JOSK.1997.1.2.074
300mm F/4.0 telephotolens with diffractive hybrid lens was designed, and its optical performance was tested and compared with a traditional lens system. DOE(Diffractive Optical Element) reconstructs wavefronts using wave phenomena of light to focus the incident light onto the focal point and has negative Abbe number while a traditional lens uses geometrical phenomena of light and has positive Abbe number. Therefore, a diffractive hybrid lens containing both refractive and diffractive elements can remarkably correct chromatic aberration and spherical aberration of an optical system. We investigated and analyzed the optical properties of a diffractive hybrid lens for the visible spectrum, and we used a difractive hybrid lens to design and evaluate a 300mm F/4.0 telephotolens without the special LD(Low Dispersive) glass lens which is costly and difficult to manufacture. Most traditional telephotolenses use the special LD glass for chromatic aberration correcton. Optical performance tests such as resolution and characteristics of aberration of both lens systems using a diffractive hybrid lens and traditional lens were performed.
Structural characteristics and properties of phase singularities in optical fibers
Lim, Dong-Sung ; Lee, Ei-Hang ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 81~89
DOI : 10.3807/JOSK.1997.1.2.081
The formation of phase singularities in optical fibers is theoretically and experimentally investigated. In particular, their structural characteristics and properties are discussed in relation to guided mode patterns. It is found that except for the fundamental linearly polarized(LP) modes, all the mixed modes displayed phase singularities in the transverse plane. The results in the few mode fiber show that superposition of the LP even and odd modes produces isolated dark points and phase singularities. Phase singularities are found to be of the screw type and of first order. The number of phase singularities linearly increases with the number of guided modes.
implementation and its limitations
Nahm, Kie-B. ; Shin, Eun-S. ; Ryoo, Seok-M. ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 90~93
DOI : 10.3807/JOSK.1997.1.2.090
The shallow depth of focus in conventional light microscopy hinders the observation of the whole image when the object is thicker than the depth of field. Most of the existing techniques measured the object distance, which is not necessarily the actual distance of each pixel in the image. We implemented a means of determining the "best focus" of each pixel and located the height of object points by sectioning at different sample heights. Combining the height information and its gray values together, we obtained an image where the blur from the finite depth of focus is eliminated. Limitations of the technique are discussed together with composed images.ed images.
Quantum theory of multiwave mixing with a local field correction
An, Sung-Hyuck ; Rhee, Bum-Ku ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 94~99
DOI : 10.3807/JOSK.1997.1.2.094
In this paper, we calculate the four coefficients for the quantum theory of multiwave mixing including a local-field correction resulting from dipole-dipole interactions. We make contact with the semiclassical calculations of probe absorption and four-wave-mixing coupling coefficients, and illustrate the effects of local field corrections on resonance-fluorescence and coupled-mode-fluorescence spectra. The method uses the hybrid quantum-Langevin-equation master-equation approach of An and Sargent.
Femtosecond degenerate and nondegenerate pump-probe experiments in bulk GaAs below the band gap
Yahng, J. S. ; Kim, D. S. ; Fatti, N.Del ; Vallee, F. ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 100~103
DOI : 10.3807/JOSK.1918.104.22.168
We perform degenerate and nondegenerate pump-probe experiments on bulk GaAs at 100 K below the band gap. We mostly observe a negative differential transmission signal both in the degenerate and nondegenerate experiments. We interpret our signal as due to two-photon absorption. This negative signal has a different origin from the normally considered band gap renormalization for resonant excitations.
Three-dimensional odd ring dark spatial solitons
Kim, Guang-Hoon ; Jeon, Jin-Ho ; Noh, Young-Chul ; Ko, Kwang-Hoon ; Moon, Hee-Jong ; Lee, Jai-Hyung ; Chang, Joon-Sung ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 104~109
DOI : 10.3807/JOSK.1922.214.171.124
The propagation properties of three-dimensional dark spatial solitons having odd ring formation is analyzed numerically in the frame of the (1 + 2)-dimensional nonlinear Schrodinger equation and compared with a pair of odd dark solitons. We discuss the experimental excitation condition of an odd ring dark soliton, which is superimposed on a finite-width background beam, with phase masks.
Cascaded Raman fiber amplifier operating at 1.3.mu.m using WDM couplers
Chang, Do-Il ; Kong, Hong-Jin ; Chernikov, S.V. ; Guy, M.-J. ; Taylor, J. R. ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 110~115
DOI : 10.3807/JOSK.19126.96.36.199
We report effcient cascaded Raman generation and signal amplification at 1.3.mu.m achieved in a ring resonator constructed solely from fiber components, i.e. fusion WDM couplers. Low-loss single-mode fiber with moderate
content (18 mole %) is used as an active medium and pumped by a Nd:YAG laser at 1.064.mu.m. In a resonant cascaded geometry, this generates the third Stokes line at 1.24.mu.m, which acts as a pump for signal wavelength around 1.3.mu.m. A DFB laser operating at 1.315.mu.m is used to provide an input signal. An output signal powers up to 20 dBm (100 mW) with a 28 dB Raman gain are attained, where the Nd:YAG pump power is 3.4 W. It is also shown experimentally that it is important to use optical filters to suppress feedback from the resonator, permitting high Raman gain and good signal quality.
Light-emitting devices with polymer-organic heterostructure
Do, Lee-Mi ; Hwang, Do-Hoon ; Choi, Kang-Hoon ; Lee, Hyang-Mok ; Jung, Sang-Don ; Zyung, Taehyoung ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 116~119
DOI : 10.3807/JOSK.19188.8.131.52
Highly quantum efficient and multi-color emissible polymer light emitting devices have been realized utilizing poly (1-dodecyloxy-4-methyl-1, 3-phenylene)(2, 5"-terthienylene)(hereafter, mPTTh polymer) as an emitting layer and tris(8-hydroxyquinoline) aluminum (Alq3) as an electron transport layer. A single layer EL device of mPTTh polymer emits orange-colored light. EL efficiency increases as the thickness of Alq3 layer increases, but the emission color becomes visually broad when the Alq3 layer thickness is greater than 30nm since the relative peak intensity of green EL from Alq3 layer grows. EL color is changed from orange to greenish orange as the thickness of Alq3 layer grows. EL color is changed from orange to greenish orange as the thickness of Alq3 layer increases. EL efficiency of the double layer device was greatly enhanced by 3000 times compared with that of a single layer device. Alq3 layer in device acts as a hole blocking electron transporting layer and an emitting layer as a function of the thickness of Alq3 layer.ayer.
Thermal fixing of multiple holographic gratings in magnesium oxide doped lithium niobate crystal: erratum
Yi, Seung-Woo ; Cha, Sung-Do ; Shin, Seung-Ho ;
Journal of the Optical Society of Korea, volume 1, issue 2, 1997, Pages 120~120
DOI : 10.3807/JOSK.19184.108.40.206