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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
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Volume & Issues
Volume 6, Issue 4 - Dec 1995
Volume 6, Issue 3 - Sep 1995
Volume 6, Issue 2 - Jun 1995
Volume 6, Issue 1 - Mar 1995
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Optical Design of Afocal Zoom Telescope System for Thermal Imagery
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 1~7
A IR zoom telescope system was designed for thermal imagery. The magnification is 4-14 and the focal length of eye piece is 25 mm. First, the frame was built up with first order optics and started design with 3rd order optics. There after, we can get the final design by optimization technique through finite ray tracing. The optical system was optimized with ray aberration or angular aberration including higer orders. Finally, The performance of the optical system was accessed by calculating the diffraction MTF from the design data. data.
Angular Spectrum of the Spontaneous Emission from Dye Molecules Near a Boundary
최현호 ; 김형주 ; 노재우 ; 박대윤 ; 제원호 ;
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 1~1
We studied experimentally the angular spectrum of the light emitted from dye Molecules near a plane boundary. It is confirmed that the molecules near the boundary can emit light into the evanescent wave mode, and the light emission with the angle greater than the critical angle is detected with good accuracy. The angular spectrum of the spontaneous radiation is measured, and the spectrum shows contributions from the molecules both near and far away from the boundary. The polarization dependence and the pumping angle dependence are also measured. The experimental results are in good agreement with quantum theory.
High-Resolution Interrogation Technique for Fiber Bragg crating Sensor Using Long-Period Fiber Grating Pair and Erbium-Doped fiber
정재훈 ; 이용욱 ; 이병호 ;
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 5~5
A novel interrogation scheme to detect fine Bragg wavelength shift using a long period fiber grating pair with erbium-doped fiber inserted between the two gratings is reported. The technique is shown to feature high resolution and much more immunity to temperature perturbation compared to the conventioned Mach-Zehnder interferometer demodulation system. For quasi-static strain measurement, this approach provides high wavelength resolution of 0.05 pm that corresponds to 41.7 ne in strain and 3.8 ×
℃ in temperature. This interrogation system is also employed in dynamic measurement to obtain the minimum detectable strain perturbation of ∼ 8.76 ne/
at 100 Hz. Moreover, this interrogation system has prominent thermal stability. This thermal stability comes from the fact that two arms of the interferometer, the core and cladding in erbium-doped fiber, are exposed to nearly the same environment .
Design and Fabrication of Real-time Lens Testing System
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 8~15
1.28-Tb/s (64 × 20 Gb/s) WDM Transmission Over 320 km of Single-Mode Fiber with 0.4- (bit/s) /Hz Spectral Efficiency
정환석 ; 전상배 ; 정윤철 ; 현덕화 ;
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 13~13
We demonstrated 1.28-Tb/s (64 ch × 20 Gb/s) WDM transmission with 50-GHz channel spacing over 320 km of conventional single mode fibers. The spectral efficiency was 0.4 (bit/s)/Hz. Thus, we could accommodate all the sixty-four WDM channels within the C-band of EDFA The average Q-factor was measured to be better than 17.8 dB after transmission over 320 km.
Spectrum Narrowing Characteristics of a Tunable Ti:sapphire Laser
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 16~20
We have studied the spectral narrowing characteristics of the tunable Ti:sapphire laser pumped by the second harmonic generation of Nd:YAG laser. Ti:sapphire laser has uniform excitation distribution by both-side end pumping. We have controlled the angle of grating linearly and achieved the continuous selection of wavelength in the broad range from 705 to 835 nm. The output energy of
at 790 nm. the spectral linewidth of
and the beam divergence of 1.2 mrad have been obtained. The wavelength range with power more than 50% of maximum output was 730-825 nm.825 nm.
Simple Q-switched Waveguide
Laser Using Polygon Mirror
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 21~25
laser using polygon mirror were constructed and their output characteristics were measured. Waveguide was made of the beryllium oxide tube of inner diameter of 2 mm, outer diameter of 20 mm, and length of 200 mm. A flat ZnSe output coupler of 80% reflectivity was placed on the 9 mm distance from the end of the waveguide. Convex lens was used to reduce the coupling loss between the polygon mirror and the waveguide. The polygon mirror was located behind of convex lens. With this condition, continuous output of the laser were measured as 1.2 W. In the Q-switched mode. pulse width 120 ns were measured with rotational speed 7,559 RPM. and peak power of up to 250 W. 250 W.
Pulse Shortening by a Kerr Cell in an Iodine Laser and the Amplification of a Shortened Pulse
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 26~32
A Kerr cell was utilized as an optical shutter to generate a shortened pulse and as an isolator between amplifiers in an iodine laser system. By rotating the polarization of incident laser pulse only during the timing window of high voltage applied to the Kerr cell, shortened pulses of 5 ns and 1 ns, corresponding to the difference in propagation time of two coaxial cables, were obtained. It was also noticed that more than one timing window of Kerr cell was produced with a long incident laser pulse from the oscillator. The measured transmittance of Kerr cell with respect to applied voltage was compared with the theoretical estimation using the electro-optic Kerr effect theory. Through the amplification of the shortened pulse in iodine amplifiers. a pulse of 0.5 GW(2 J in 4 ns) was obtained. ained.
Excited State Absorption and Nonradiative Transition from the Lowest 5d State of
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 33~38
We have measured the excited state absorption in
, crystals for the first time and assigned it for a 5d
conduction band transition. Two broad absorption bands were observed at 555 nm and 465 nm fowllowing the 308 nm XeCl laser excitation and their cross sections and oscillator strengths were calculated. We have also measured the fluorescence lifetimes in between 300 K and 700 K to study the nonradiative relaxation from the lowest 5d state of
ions and explained ESA and the transition process from the state in terms of a configurational coordinate.dinate.
Numerical Analysis of High-Order Harmonic Generation in Alkalic Metal Ions
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 39~44
Rotational Reorientation Dynamics of Rhodamine 6G molecule in
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 45~49
Elastic properties of ion-assisted Cr films measured by brillouin light scattering
;;;John R. Dutcher;
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 50~55
We have performed Brillouin light scattering experiments to study the elastic properties of Cr films deposited on soda-lime glasses by using Ar-ion assisted deposition techniques. The elastic constants of the films increased as the ion-current density employed during the film deposition increases and they approached to the values of bulk Cr. The best fit values of the elastic constants of the films manufactured with ion current density of
and these are 5% lower than those of bulk Cr in hexagonal symmetry. metry.
Pulsed 15Hz Laser System for Ranging
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 56~61
Signal processing of interferometric fiber-optic sensor utilizing a digital homodyne detection
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 62~69
Fiber-Optic Gyroscope Using Erbium-Doped Fiber Amplifier Source
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 70~75
Spectroscopy in Semiconductors
Korean Journal of Optics and Photonics, volume 6, issue 1, 1995, Pages 76~90