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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Optics and Photonics
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Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 26, Issue 6 - Dec 2015
Volume 26, Issue 5 - Oct 2015
Volume 26, Issue 4 - Aug 2015
Volume 26, Issue 3 - Jun 2015
Volume 26, Issue 2 - Apr 2015
Volume 26, Issue 1 - Feb 2015
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SI-traceable Calibration of a Transmissometer for Meteorological Optical Range (MOR) Observation
Park, Seongchong ; Lee, Dong-Hoon ; Kim, Yong-Gyoo ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 73~82
DOI : 10.3807/KJOP.2015.26.2.073
This work demonstrates the indoor SI-traceable calibration of a transmissometer with a 75-m baseline for the measurement of visibility in MOR (Meteorological Optical Range). The calibration is performed using a set of neutral density (ND) filters (OD 0.1-2.5) and a set of high-transmission quartz glass plates (a bare quartz glass plate and antireflective-coated quartz glass plates), the collection consisting of 20 artifacts in total. The luminous transmittance values of the reference artifacts had been calibrated traceable to the KRISS spectral transmittance scale, which ranges from 0.2 % to 99.5 %. The transmissometer to be calibrated typically consists of a loosely collimated light source based on a white LED (CCT ~5000 K) and a luminous intensity detector with a CIE 1924 V(
) spectral response. As a result of calibration, we obtained the MOR error and its uncertainty for the transmissometer in 20 m - 40 km of MOR. Based on the results, we investigated the applicability of the calibration method and the conformity of the transmissometer to the ICAO's (International Civil Aviation Organization) accuracy requirement for meteorological visibility measurement. We expect that this work will establish the standard procedure for the SI-traceable calibration of a transmissometer.
Improving the Sensitivity of an Ultraviolet Optical Sensor Based on a Fiber Bragg Grating by Coating With a Photoresponsive Material
Kim, Woo Young ; Kim, Chan-Young ; Kim, Hyun-Kyoung ; Ahn, Tae-Jung ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 83~87
DOI : 10.3807/KJOP.2015.26.2.083
This study was focused on developing an optical sensor that monitors ultraviolet (UV) light. Recently, we proposed and demonstrated a novel, highly sensitive UV sensor based on a fiber Bragg grating (FBG). To ensure that the incident UV light is focused on the FBG surface, the sensor was coated with an azobenzene polymer material that acts as a UV-induced stretchable functional material, in combination with a cylindrical focal lens. In this study we have improved the sensitivity of the sensor by employing a cylindrical focal mirror as a curved reflector, to refocus the UV light passing through the FBG. We considered the performance of several different types of reflectors and chose the optimal radius of curvature for the reflector. Compared to the UV sensor without an auxiliary device, the sensitivity of the FBG sensor with a focal lens and a curved reflector was 15 times as high.
Catadioptric Omnidirectional Optical System Using a Spherical Mirror with a Central Hole and a Plane Mirror for Visible Light
Seo, Hyeon Jin ; Jo, Jae Heung ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 88~97
DOI : 10.3807/KJOP.2015.26.2.088
An omnidirectional optical system can be described as a special optical system that images in real time a panoramic image with an azimuthal angle of
and the altitude angle corresponding to the upper and lower fields of view from the horizon line. In this paper, for easy fabrication and compact size, we designed and fabricated a catadioptric omnidirectional optical system consisting of the mirror part of a spherical mirror with a central hole (that is, obscuration), a plane mirror, the imaging lens part of 3 single spherical lenses, and a spherical doublet in the visible light spectrum. We evaluated its image performance by measuring the cut-off spatial frequency using automobile license plates, and the vertical field of view using an ISO 12233 chart. We achieved a catadioptric omnidirectional optical system with vertical field of view from
and an azimuthal angle of
. This optical system cleaniy imaged letters on a car's front license plate at the object distance of 3 meters, which corresponds to a cut-off spatial frequency of 135 lp/mm.
Measurement of the Radiative Quantum Efficiency of a Solid-State Laser Using Photoacoustic Spectroscopy
Kim, Byung-Tai ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 98~102
DOI : 10.3807/KJOP.2015.26.2.098
The radiative quantum efficiency of a solid-state laser was measured by photoacoustic spectroscopy with a PZT as the detector. The radiative quantum efficiency was about 58.3 % for a laser-diode pumped Nd:S-VAP laser under lasing conditions. The measurement of radiative quantum efficiency was presented as an effective method for the optimization of a laser resonator.
A Study of the Phase Relations Between the Reflected and Transmitted Light Waves at a Beam Splitter and Their Application to Interferometers
Son, Byungwoo ; Choi, Hee Joo ; Park, Ju Eun ; Cha, Myoungsik ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 103~109
DOI : 10.3807/KJOP.2015.26.2.103
In an amplitude-splitting interferometer, a beam splitter divides an input beam into two parts, which are superposed after propagating along separate paths, producing an interference effect. We have investigated the phase relation between the reflected and transmitted light waves at BS's made of lossless dielectric stacks. If we define the phases with proper reference planes, a definite phase relation exists, irrespective of the detailed structure of the layers in the BS. Although this results from the generalized Stokes relations, we have verified it numerically for two representative BS's with symmetric and asymmetric layer structures respectively. When we applied the phase relation to interferometers, we could determine the superposition state of the output beam (either constructive or destructive interference) for a general BS, and could verify that the light's energy was conserved.
Reduction of Color Shift Using Dichroic Dyes in a Cholesteric Liquid Crystal Cell
Park, Jun-Hee ; Oh, Seung-Won ; Yoon, Tae-Hoon ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 110~114
DOI : 10.3807/KJOP.2015.26.2.110
We propose a reflective cholesteric liquid crystal cell with reduced color shift, using dichroic dyes. Color-shifted light is absorbed by dye molecules in the proposed dye-doped cholesteric liquid crystal (DDCLC) cell. We have shown that the color shift can be reduced by increasing the concentration of dye molecules in the proposed DDCLC cell.
Ellipsometric Expressions for Two Uniaxially Anisotropic Layers Coated on a Multilayered Substrate
Kim, Sang Youl ;
Korean Journal of Optics and Photonics, volume 26, issue 2, 2015, Pages 115~120
DOI : 10.3807/KJOP.2015.26.2.115
Explicit expressions are derived for the effective reflection coefficients of obliquely incident light on a multilayered substrate coated with two uniaxially anisotropic films. Based on these reflection coefficients, ellipsometric constants are obtained as function of the tilt and azimuthal angles of the optical axes of the uniaxial films. Explicit expressions are provided, which can be used to separate the effects of surface anisotropy for anisotropic film from that of its bulk anisotropy, so that these expressions may be utilized in characterizing the surface anisotropy of alignment layers.