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Korean Journal of Optics and Photonics
Journal Basic Information
pISSN :
1225-6285
eISSN :
2287-321X
Journal DOI :
10.3807/KJOP
Frequency :
Others
Publisher:
Optical Society of Korea
Editor in Chief :
Young-Chul Chung
Volume & Issues
Volume 2, Issue 4 - Dec 1991
Volume 2, Issue 3 - Sep 1991
Volume 2, Issue 2 - Jun 1991
Volume 2, Issue 1 - Mar 1991
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1
Development of Interferometer for Performance Assessment of IR Optical System
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 179~185
Abstract
Twyman-Green interferometer is developed for assessment of IR optical system performance. Light source is
gas laser which has 10.6
wavelength. The light beam is expanded to 2.5 cm dia by Ge lens and splitted by ZnSe parallel plane plate. One of the beams is reflected by refernce mirror which is operated PZT. The fringe will be detected by a pyro-electric vidicon camera and displayed by a CRT monitor. Here, the IR firinge is recorded on the thermal paper. In visible region, the light source is He-Ne laser. The fringe is detected by a CCD camera and displayed by the CRT monitor. The intensity of the fringe is digitized by a image card and processed by a PC. The wavefront aberration function, PSF and OTF are calculated. The results are displayed in 3-D graphs on the monitor or printed out by a line printer.
2
Four Spherical Mirror Stepper Optics for Deep UV Micro-Lithography
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 186~192
Abstract
For the micro-lithography using a excimer laser beam
. a mirror system consisting of four spherical surfaces with reductlon magnification 5X is designed. Initially the aplanat, flat field and the distortion free condition of the system are analytically investigated within Seidel 3rd order aberrations. And the computer-aided optimization technique has been employed for the further improved performance of the system. The final system has N.A. of 0.15 and image field diameter 3.3 mm, and has the diffraction-limited performance for KrF eximer laser beam.
3
Development of Holographic Reflection Filters
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 193~196
Abstract
Reflection holographic filters are developed. Dichromated gelatin films are used for the recording material, and a modified processing method of obtaining high-quality filters is developed. The diffraction efficiency and bandwidth of the fabricated holographic filter is 93% and 17 nm, respectively. The effect of exposure on the spectral bandwidth and center wavelength of the developed filters are measured, and the characteristics of the dichromated gelatin film are investigated from these results.
4
Development of Real Time Autocorrelator and the Measurement of Pulse Width of CW Mode-Locked Nd:YLF Laser
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 197~202
Abstract
The real time autocorrelator has been developed in order to measure the pulse widths of ultrashort laser pulses using the SHG method. The scanning range of the autocorrelator is 142 ps, and inserting a delay block in one arm of the autocorrelator, the scanning range can be extended to 250 ps. The shortest pulse width was measured to be 20 ps, when the cavity length was well matched to the RF frequency of the mode-locker, and broadened to be 39 ps and 47 ps as the cavity length was detuned.
5
Study for Energy Transfer from Rhodamine 6G to Malachite Green Using Time Correlated Single Photon Counting Method
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 203~208
Abstract
We investigated the nonradiative energy transfer process from Rhodamine 6G to Malachite Green in ethylen glycol solvent using time correlated single photon counting system equipped with a modelocked Ar ' laser. The reduced concentration and critical transfer distance for various acceptor concentration were obtained by using a full-fitting analysis of the fluorescence decay curves. We found that Huber model is more suitable than Forster model and the influence of energy migration through the dipole-dipole interaction becomes more significant for the low acceptor concentrations relative to the donor concentration(
mol/l).
6
Fabrication of Transient Absorption Spectroscopic System and Measurement of Transient Absorption Changes of DDI
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 209~213
Abstract
Recently, the developments in generating and amplifying ultrashort optical pulses
have imposed on great advances in the time-resolved laser spectroscopy. Especially, the transient absorption spectroscopy has a wide application range and the main idea of this technique is pump & probe method. After the pump pulse makes the material an excited or a transient states, the probe pulse is sent through the material to measure the absorbance change due to the transient states. Here, if the absorbance change was measured by the time delay between pump & probe pulses, the dynamic information of the excited or the transient states (the transient abnsorption changes by time & wavelength) can be obtained. At our laboratory, the ultrashort optic1 pulse (
7
Fourth-Order Interference Between Fluorescent Photon and a Laser Field
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 214~218
Abstract
Fourth-order interference is investigated between fluorescent photons from an atom driven by a laser and then laser field itself, and compared with second-order interference. For some consitions the visibility exceeds 50% which is known to be classical limit. Even though a long time has passed since the laser beam drives the atom, the fourth-order interference can exist while the 2nd-order interference disappear for
>>1.
8
Photoacoustic Determination of Thermophysical Properties of Thin Metallic Plates by Using Parameter Estimation
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 219~226
Abstract
The phase and the amplitude of the photoacoustic signal were measured as a function of chopping frequency for several kinds of widely used thin metallic plates (stainless steel 304, brass, aluminum and copper) attached to plexiglass backing. The experimental data have been analyzed systematically by parameter estimation technique based on the two-layer model developed from Rosencwaig-Gersho (R-G) theory. Using this analysis, the values of thermal diffusivity and thermal effusivity of the materials have been determined.
9
Theoretical Analysis for the HF Chemical Laser System with a Selected Fluoride Molecule
You, Myung-A ; Cho, Ung-In ; Kim, Sung-Ho ;
Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 227~232
Abstract
The possibility for the high intensity and energy possessing a short pulse in the HF chemical laser system which contained fluoride molecules (RF) was demonstrated theoretically through the numerical model simulation. The calculation was accomplished by assuming that the thermal branched chain mechanism of RF was occurred in the initiation step of
chain reaction. Variations of the major chemicals and the temperature in the system were calculated as a function of time. An analysis was also performed to evaluate output pulse profile through parametric studies.
10
Characteristics of Top-Surface-Emitting Microlasers and Active Surface Emitting Laser Logic Devices
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 233~241
Abstract
Structures, fabrication, and characteristics of top-surface-emitting GaAs four quantum well microlaser are described. The microlasers have good room-temperautre CW characteristivs. The maximum CW laser output is >3mW from a 30
diameter microlaser and the maximum differential quantum efficiency is >70% from a 10
diameter microlaser. Active surface emitting laser logic devices are designed and fabricated as a discrete version of a top-surface-emitting laser and heterojunction phototransistor. The active surface emitting laser logic device have high optical gain (>20 overall, >200 differential) and very high on/off ratio. Two-dimensional arrays of top-surface-emitting microlasers and active surface emitting laser logic devices will be critical elements for optical computing, photonic switching and neural network applications.
11
광열견과 계산을 위한 반도체 소자
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Korean Journal of Optics and Photonics, volume 2, issue 4, 1991, Pages 242~251
Abstract
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