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홀로그래피 방식으로 발생된 위상공액파를 이용한 정밀 정렬
崔玉植 嶺南大學校 基礎科學硏究所 1993 基礎科學硏究 Vol.13 No.-
A precise alignment signal for a stepper equipment by means of TTL(through-the-lens) alignment has been chased using holographical phase conjugate waves as an alignment beam. The size of the alignment beam on the wafer was 4 ×60㎛, , and the alignment mark was the reflection type grating with the photoresist coated, 4 ×4㎛ squares with 8㎛ in pitch. The hologram generating the phase conjugate waves has been prepared on Agfa 870-E plate film with He-Ne laser(632.8nm, 5mW) in the amplitude type. The alignment beam has passed through the projection lens to form a line shaped illumination area on the wafer which then scanned the aligenment mark on the wafer. The diffracted beams by the alignment mark then passed back through the projection lens and were detected as the alignment signal at the detector. We were also able to obtain the alignment signals for the Al layer and for the bare layered photoresist wafers.
崔玉植 嶺南大學校附設 基礎科學硏究所 1988 基礎科學硏究 Vol.8 No.-
The optical pattern recognitions are carried out for a circular function, namely, a ring shaped pattern. The ordinary difficulties in placing back the matched filter to its original position exactly have been overcome by processing the hologram at-the-position, that is, the matched filter just photographed will be promtil developed, fixed and rinsed out at its own place without removing it to process. In focusing the filter a bare strip of transparent film was set up on the film mount, and through observation with a magnifying lens from the rear of the film the exact position of the focal plane could be determined. The comparision of the results shows that the at-the-position method could be acceptable by wider users of such experiment like this one.
崔玉植 嶺南大學校附設 基礎科學硏究所 1984 基礎科學硏究 Vol.4 No.-
Some spatial filterings are examined by means of Fourier Transform of lenses. The spectral distributions are numerically calculated via a personal computer which yields the graphical figures dotted by 200 points for each filtering. The effects of the spatial filterings are easilly interpreted, the rigor mathematical treatment, however, being remaining as untouchable, so far as discrete numerical data are concerned.
경천수,성기영,이영락,김대건,곽종훈,최옥식 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-
We designed and fabricated a reflection-type holographic interference filter in a dichromated gelatin film. The relationship between center wavelength and recording angles was derived by wsing coupled wave theory in detail. The variations of center wavelength of the filter were predicted theoretically measured in terms of recording angles.
홀로그램 회절격자의 이동에 의한 포토폴리며의 위상 변위측정
성기영,경천수,김휘성,이진국,곽종훈,최옥식 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-
Holographic recording and erasure kinetics in a home-made photopolymer film are investigated as a function of monomer concentration and spatial frequency. We also measured phase shifts of index grating and absorption grating by moving holographic photopolymer gratings along a direction of grating wave vector.
Kodak 649F Plates를 이용한 Dichromated Gelatin 홀로그래픽 감광재 처리 방법 연구
임용석,이영락,최옥식 嶺南大學校 基礎科學硏究所 1995 基礎科學硏究 Vol.15 No.-
Dichromated gelatin plays an important role to fabricate various kinds of holographic optical elements. In this study, we have investigated the processing method and the characteristics of dichromated gelatin recording materials by using Kodak 649F plates. The processing methods for obtaining high diffraction efficiencies and environmental stability which are necessary for the fabrication of the holographic optical elements are presented. Exposure characteristics, spectral and angular sensitivity, and the degradation of the diffraction efficiency versus time are measured. The maximum diffraction efficiency of the obtained holographic grating is about 90%.
全炳基,崔玉植 嶺南大學校附設 基礎科學硏究所 1981 基礎科學硏究 Vol.1 No.-
This paper show that the nucleon form factor can be obtained from dispersion relation and the calculation of absorption part and the obtained form factor formula fits to the recent experimental results.
광굴절 결정(BaTiO₃)에서 편광방향에 따른 회절특성
이정훈,성기영,이영락,김성하,곽종훈,최옥식 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-
Volume phase gratings in photorefractive crystals have nonuniform amplitude and phase due to energy exchange by the writing beams within the material. For a read-out beam of arbitrary intensity, the diffraction efficiency is a nonlinear function of reading beam intensity and depends on the polarization of writing beams as well as the read-out beam polarization. It is found that the diffraction efficiency represents a nonreciprocity with respect to the polarization of the writing and reading beams. These polarization dependences of photorefractive gratings are studied here.
BaTi₃광굴절 결정에서 광굴절 격자와 광흡수 격자의 측정 및 해석
성기영,경천수,곽종훈,이상조,이영락,최옥식 嶺南大學校基礎科學硏究所 1999 基礎科學硏究 Vol.19 No.-
We derived an approximate analytic solution of the coupled wave equation for mixe gratings (photorefractive and photochromic gratings) and measured the grating phases an grating amplitudes by adopting grating translation technique.
Dye-doped Polymer에서의 광유도 비등방성 측정
이정훈,곽종훈,이영락,최옥식 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-
We have fabricated an azo-dye doped ploymer film and measured photoinduced anisotropy and polarization-depend at transmittance.