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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Optics and Photonics
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Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 4, Issue 4 - May 1993
Volume 4, Issue 3 - May 1993
Volume 4, Issue 2 - May 1993
Volume 4, Issue 1 - May 1993
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Gaussian Bracket Expressions of Aplanatic and Achromatic Conditions for Telephoto Type Telescope Objective Derived from the Numerical Solution
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 243~251
We have derived Gaussian bracket expressions of aplanatic and achromatic conditions and obtained the numerical solutions for each of two modules of the telephoto type telescope objective free from the Seidel first order spherical aberration, coma, and longitudinal chromatic aberration. The system which is for use in sighting a target is optimized within the resolution of eyes. The objective lens satisfying the aplanatic and achromatic condition has f/8.5 with the half field angle 0.
, and the telephoto ratio is 0.839 with the focal length of 30 cm.
Holosymmetric 4-Mirror Optical System(Unit Maginification) for Deep Ultraviolet Lithography Obtained from the Exact Solution of All Zero Third Order Aberrations
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 252~259
A holosymmetric four-mirror system with unit magnification is designed for use in the micro-lithography using a deep ultraviolet wavelength of
(KrF excimer laser line). In the holosymmetric system all orders of coma and distortion are zero. By applying this principle to the 4-spherical mirror system, we have obtained only one exact solution for the unit magnification holosymmetric four-spherical mirror system with all zero third order aberrations. For correction of the residual higher order aberrations of the system, aspherization is introduced keeping the holosymmetric properties. We have obtained near diffraction-limited performance for the wavelength of 0.248 pm within N.A. of 0.33 and image field diameter of 7.6 mm.
In-situ Measurements of the Stress in
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 260~265
An in-situ stress measurement interferometer is constructed and used to measure the intrinsic stress in Ti
thin films during their growth by ion-assisted deposition. It is found that the stress increases with the momentum transferred by the ion beam to the growing film and is fairly well agreed with Windischmann's model. The variation of the stress with thickness is qualitatively explained in terms of the balance between the compressive stress produced by the ion beam and the surface diffusion determined by the surface temperature.
Fabrication and Characterization of LPCVD
Films for Inegrated Optics (1) -LPCVD of TEOS and TMPite
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 266~275
films on silicon for integrated optics application by low pressure chemical vapor deposition using TEOS (tetraethylorthosilicate) and TMPite (trimethylphosphite) and studied the deposition characteristics. The activation energy of the reaction was changed from 54.6 kcal/mole to 39.2 kcal/mole by incorporating the TMPite into the reaction of TEOS. The deposition rate and the P concentration of films increased in proportion to the flow of TMPite. As the deposition temperature increased, the deposition rate of the films increased but the P concentration decreased. The fabricated films showed the increase of refractive index of 0.0019 per 1 wt% of P concentration. The nonuniformity of films was
7% in thickness and
0.5wt% in P concentration and we showed this'nonuniformity is due to the nonuniform transport of TMPite. The films of more than 10wt% P concentration developed phosphoric acid on its surface when exposed to air for long time.
Control of Center Wavelength and Bandwidth of Holographic Reflection Filter
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 276~280
Holographic reflection filters are fabricated by using the dichromated gelatin film. The characteristics of diffraction efficiency, center wavelength, and bandwidth which are important parameters of reflection-type holographic optical elements is explained from the experimental results, and control method of these parameters is presented.
A Numerical Analysis for Optimum Design of Multi-Stage Amplifier System of High Power Dye Laser
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 281~288
We have investigated the output characteristics and optimal conditions of a multi-stage amplifier system of Rhodamine 6G dye laser. The parameters in this simulation work were the beam diameter of the dye laser oscillator, the size of dye cell, the dye concentration, the number of stages in the amplifier system, and the pumping energy ratio of each amplifier at given pump energy. As a result, the output energy 10 mJ and the conversion efficiency of 40% in the two stage amplifier system were obtained with the pumping energy of 25mJ and the oscillator energy of 0.01 mJ.
CW Operation of LD-pumped Nd -YLF Laser-
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 289~293
A Nd:YLF laser pumped by a CW GaAlAs laser diode(LD) at 792 nm has been designed and fabricated. The output power was investigated as a function of LD spectrum and pump power. A folded laser resonator was desinged to compensate for the astigmatism produced at the Brewster surface of Nd:YLF rod. We obtained output power of CW 1.1 Watt when the pumping power was 2.8 Watt and the output wavelength of LD was temperature tuned to the peak absorption line of Nd:YLF. The overall efficiency was 39 % and slope efficiency was 41 %.
Active Optical Logic Devices Using Surface-emitting Microlasers
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 294~300
Monolithic NOR and INVERTER active optical logic devices inte- grated with surface-emitting microlasers, heterojunction photo- transistors(HPT) in parallel and resistors in series are characterized. The differential quantum efficiency of the typical AlGaAs superlattice microlaser integrated in the active optical logic devices is 15%. Current gain of the HPT is 57, when emitter-collector voltage and input optical power are 4 V and
of output power from the active optical logic device decreases to zero when
of input optical power is incident on the HPT part of the active logic device.
연속 파장 가변시 현상론적인 비 선형 이득 포화 효과가 다전극 DBR 레이저의 변조 특성에 미치는 영향
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 301~308
Phenomenological nonlinear gain saturation effect on the modulation characteristics in a multi-electrode DBR laser, when the lasing wavelength changes, continuously is analized theoretically. FM efficiency, 3 dB bandwidth, and resonance frequency decrease with increasing bias current to the passive section, except increasing the flat FM response. It is found that the nonlinear gain saturation effect severely affects the modulation characteristics such as FM/IM response, 3 dB bandwidth, resonance frequency and CPR, but hardly affects the behavior of continuous frequency tuning.
Vectorial Solutions of the Eigenmodes of the Waveguide with Semicircular Cross-Section
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 309~316
We find the vectorial solution of the optical waveguide with semicircular cross-section by expanding the electromagnetic fields of the waveguide into the series of trigonometric and Bessel funtions and by applying the boundary conditions at the finitely selected points on the interface of the core and the cladding. We find also the propagation constants and the energy distributions of the eigenmodes and discuss its properties. As a result of computation, we find that the electromagnetic fields of the even modes about the symmetric axis of the semircular shape are nearly the same as those of the odd modes except that E and H of the odd modes are replaced by -H and E and that the even and odd modes are degenerated as the ratio of refractive index of the core and cladding approaches to 1.
Analysis of a Nonlinear Integrated-Mirror Etalon by the Characteristic Matrix Method
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 317~322
In this paper we propose a method to analyze the nonlinear behavior of an integrated-mirror etalon by the characteristic matrix method. If the dependence of the refractive index and the absorption coefficient upon the light intensity are known, we can couple this with an equation by which we can evaluate the light intensity distribution inside an etalon for the given values of the refractive index and the absorption coefficient. By solving these coupled equations by the iteration method, we evaluate the transmission characteristics of a nonlinear integrated-mirror etalon. By the characteristic matrix method, we have demonstrated the static and dynamic bistable behavior of a nonlinear integrated-mirror etalon.
Light-intensity Dependence of Diffraction Efficiency in -
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 323~329
In this paper, dependence of the diffraction efficiency upon incident light intensity is studied. The conductivity ratio, which is dependent upon the incident light intensity, changes the static electric field in a crystal. This change of the static electric field modulates the refractive index via linear electro-optic effect. And the change of the refractive index affects the diffraction efficiency. It is found that experimental results with
crystals are in good agreement with the theory.
Passive Mode Locking of Figure '8' Type Erbium-doped Fiber Ring Laser Using Nonlinear Loop Mirror
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 330~337
Figure '8' type, passively-mode-locked erbium-doped-fiber ring laser was developed, incorporating a nonlinear loop mirror. Transmittance of the loop mirror was found to be dependent on the incident light intensity due to the non-reciprocal nonlinear phase shift, which enables the passive mode locking of the laser. Self-starting of stable mode locking was possible with only controlling the polarization controllers inside the cavity without any help of external perturbation or modulation. The mode-locked output pulse shape was discussed in relation with the transmission characteristics of nonlinear loop mirror.
Rotational Diffusion of Rhodomine 6G Molecule -Effect of Dielectric Friction in Alcohol Solvents-
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 338~346
The rotational reorientation times of rhodamine 6G molecule were measured using a time-correlated single photon counting method. To explain the deviation of observed rotational reorientation times in alcohol solvents from the prediction of hydrodynamic model, the contribution of dielectric friction was considered. And the values of transition dipole moments in ground and excited states were estimated through the dielectric friction and the static spectroscopic data.
펌프-촉침 방법을 이용한 피코초 순간 흡광 속도분광기 제작
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 347~353
A picosecond transient absorption kinetic spectrometer using a pump-probe method is presented and compared with other methods of picosecond transient absorption measurements. This constructed kinetic spectrometer detects the transient transmittance of sample using a lock-in amplifier as a function of delay time between pump and probe pulses generated from a picosecond mode-locked cw dye laser. Typical transient absorption and ground state bleach recovery kinetic profiles measured with this spectrometer are shown. Excellent kinetic curves of transient absorption or ground state bleach recovery may be obtained at single wavelengths with this spectrometer.
Temperature Limitation for Safe Operation in a Slab Laser Glass Set by Thermal Frature
Korean Journal of Optics and Photonics, volume 4, issue 3, 1993, Pages 354~358
The temperature distribution inside a zigzag slab laser glass was measured using a Mach-Zehnder interferometer. The temperature difference between the center and the surface of the slab caused the fracture of the slab glass. Two laser glasses were fractured at a temperature difference
respectively. For the design of high-average power glass laser, it is recommended that the limit of the temperature difference
inside the slab glass should be smaller than
for safe operation.ration.