Generally, aspheric glass lenses are manufactured using a glass molding press (GMP) method and a tungsten carbide mold core. This study analyzes the thermal deformation that occurs during the GMP process, and the results were applied to compensate an aspheric glass lens. After the compensation process, the form accuracy of aspheric glass lenses improved from ∼3.7 to ∼0.35 μm. The compensated lens complied with the actual specifications.
To expand the suitable stereoscopic viewing zone on depth directional and remove the crosstalk induced by the structures of the existing slanted lenticular lens sheet, Segmented Lenticular lens having Varying Optical Power (SL-VOP) is proposed.
In this paper, the sugar content prediction determination system in optical non-contact type based on the near infrared light emitting diode (NIR-LED) lamp is proposed. As the result NIR-LED lamp reduced 86% of the energy consumption compared to the case of Halogen lamp in the same process of sugar content determination. And the result of prediction of sugar content by NIR-LED lamp is shown to as near the same level of Halogen lamp system.
Autostereoscopic multi-views 3D display system has a narrow freedom of degrees to the observational directions such as
horizontal and perpendicular direction to the display plane than the glasses on type. In this paper, we proposed an
innovative method that expanding a width of formed viewing zone on the depth direction keeping with the number of
views on horizontal direction by using the triple segmented-slanted parallax barrier (TS-SPB) in the glasses-off type of
3D display. The validity of the proposal is verified by optical simulation based on the environment similar to an actual
case. In benefits, the maximum number of views to display on horizontal direction is to be 2n and the width of viewing
zone on depth direction is to be increased up to 3.36 times compared to the existing one-layered parallax barrier system.
We investigate the modulation properties of a three-guide coupled rectangular ring laser having bidirectional lasing
characteristics. Two different rectangular lasers having active section lengths of 250 and 350 μm and total cavity lengths
of 580 and 780 μm are fabricated. The rectangular laser cavity consists of four low loss total internal reflection mirrors
and an output coupler made out of three passive coupled waveguides. For both the clockwise and counterclockwise
circulating directions, the lasing threshold currents of around 38 mA are obtained at room temperature under continuous
wave operation. A 3-dB modulation bandwidth over 3 GHz is observed in both circulating directions for two different
lasers.
We investigated the properties of a triangular microresonator using the total internal reflection (TIR) mirrors with a
long evanescent field around the critical angle. For the sensitivity analysis, we have calculated the mirror offset due to
the Goos-Hänchen effect and the resonance shift of the triangular resonator with the refractive index change of the outer
region in the TIR mirror. The mirror offset is increased up to 0.8 μm for the transverse electric (TE) polarization and
2.0 μm for the transverse magnetic (TM) polarization to the incident angle of 18°. Then, the resonance shift of 417 pm
for the TM polarized light and 34 pm for the TE polarized light were observed, respectively, by changing the refractive
index of 4×10-5. The measured extinction ratio of triangular ring resonator was about 6 dB near 1550 nm, in where the
incidence angle of the TIR mirror inside the resonator was 18°.
Recently, the global applications of aspheric lens are expanding rapidly on the electronics, optical components,
communications, aerospace, defense, and medical optics devices, etc. F-Theta lens, which is one of major applications of
aspheric lens, is a core optical part in Laser Scanning Unit (LSU) because it mainly affects the optical performance of
LSU. F-Theta lens is made of the plastic using the injection molding method because of its cost and weight. In this
study, the mold core for F-Theta lens, which is consisting of two non-axisymmetric aspheric surfaces, was processed by
fly-cutting method, and the form accuracy of the mold core was measured. The product of the F-Theta lens, which was
fabricated by the injection molding method, was satisfied that can be applied to the actual specifications.
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