Session Index

Optical Design and Testing

Poster Session Ⅰ
Friday, Dec. 4, 2015  11:30-12:30
Chair:
Room:
Notes: N/A
Paper No.  2015-FRI-P0501-P001
Kai-Chuan Chan Award Candidate FREE-FORM HELIOSTAT TO BE USED IN DAYLIGHTING SYSTEM


The heliostat is composed by parabolic and free-form reflection surfaces, which is different from the traditional heliostat by merely using mirrors. The parabolic reflector is used to concentrate more power on the collector to improve the total power. The new design increases the average daily efficiency of daylighting system’s 2.94 times, and average daily power 25.7 times.

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Paper No.  2015-FRI-P0501-P002
Wen-Hsuan Hsieh Award Candidate Passive Alignment High-Power Lasers to Polarization Maintaining Fibers by Dependence-Oriented Microlens


A new scheme of dependence-oriented microlens (DOM) employing automatic grinding and accurate positioning for passive alignment lasers coupled to polarization-maintaining-fibers is demonstrated with 83.4% coupling efficiency and 31.7-dB polarized extinction ratio. The unique advantage of the DOM is only aligning the DOM endface of fast-axis parallel to the laser-polarization axis.

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Paper No.  2015-FRI-P0501-P003
Cheng-Mu Tsai Award Candidate Tolerance Analysis of Lens Design


This research developed a platform for opto-mechanics lens system to simulate the designed lens performance and yield rate when mass product. In order to accurately predict yield rate we consider real situation in the assembly process, and a variety of probability density functions compiled by Code V optical software.

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Paper No.  2015-FRI-P0501-P004
YU-ZHENG LIN Award Candidate Free-form microstructure collimator design for daylighting system


Recently, many countries are developing the daylighting system, which can directly collect sunlight for indoor illumination. This paper investigates a design of the free-form microstructure collimator, which enhances the efficiency of the light concentrator used in the Natural Light Illumination System (NLIS). With the free-form microstructure collimator, the NLIS can now provide sufficiently powerful light for indoor illumination, increases the performance as high as 82%.

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Paper No.  2015-FRI-P0501-P005
XUAN-WEI LI Award Candidate Design of small displacement sensor based on high sensitivity total internal reflection interferometry


This paper designs a small displacement sensor based on highly sensitive total internal reflection (TIR) interferometry. The system consists of a plane mirror, and a high-sensitivity TIR heterodyne interferometer. A heterodyne light beam reflected by a plane mirror penetrates into a high-sensitivity TIR apparatus at an angle larger than a critical angle. A small displacement of the mirror causes the light beam incident on the TIR apparatus to be deflected, thereby inducing a phase difference variation of the light beam emerging from the TIR apparatus. The numerical simulation demonstrates that the sensitivity and the resolution of 0.6/m and 0.05m can be achieved.

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Paper No.  2015-FRI-P0501-P006
Wei-Ming Huang Award Candidate Tunable liquid crystal microlens with cured electrode by inkjet printing


A tunable liquid crystal microlens with parabolic-shaped electrode was proposed. We use a new approach to fabricate a liquid crystal microlens with parabolic-shaped ITO electrode by using the hydrophilic confinement and inkjet printing. According to theoretical analysis, using a parabolic-shaped electrode can achieve the shortest focal length because of increasing the gradient of electric field in the LC layer and keeping a lower operating voltage.

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Paper No.  2015-FRI-P0501-P007
Jia-Hao Zhou Award Candidate High efficiency design of LED headlamp with con-focal reflector system


The effects of multi-step reflectors have been developed for LED headlamp. An optical simulation of different step-reflector was done to improve the optical performance. The best angle type was designed by the multi-angle to achieve the high quality and low energy loss for optical structure under standard ECE R113.

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Paper No.  2015-FRI-P0501-P008
Bo-Jian Chen Award Candidate A freeform microstructure surface for circular light emitter


We propose a lighting component with freeform microstructures that can be combined with the radial concentrator of NLIS (Natural Light Illumination System). Due to reversibility of light, the concentrator can be transformed into an emitter with this component.

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Paper No.  2015-FRI-P0501-P009
Yu-Jen Wang Award Candidate A Polarizer-free Liquid Crystal Lens Exploiting an Embedded-multilayered Structure


Development of liquid crystal (LC) lenses toward large aperture sizes is limited by the power law. The lens power of LC lenses is inversely proportional to the square of aperture sizes. In this letter, we prove a polarizer-free LC lens emancipated from the power law by exploiting an embedded-multilayered structure. The potential applications are ophthalmic lens and wearable devices.

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Paper No.  2015-FRI-P0501-P010
Yu-Chan Guan Award Candidate Precision Saturated Absorption Spectroscopy of Molecular Ions in the 3 – 4 um Band


We have built an instrument capable of measuring the ro-vibrational transitions of molecular ions with sub-MHz precision. A homemade single frequency, continuous-wave and widely tunable, mid-infrared optical parametric oscillator (OPO) was used. The tuning range of its idler wave was 3.2 to 4 μm and the idler power could reach 2 W at 3.6 μm. The molecular ions were produced in an extended negative glow discharge tube, which can produce high concentration of molecular ions at low pressure. Double modulation (amplitude modulation and concentration modulation) was employed to effectively increase the signal-to-noise ratio. To determine the absolute frequency of the idler wave, the pump wave was offset locked on the R(56) 32-0 a10 hyperfine component of 127I2, and the signal wave was locked on a GPS disciplined fiber optical frequency comb (OFC). Here, we introduce this instrument and demonstrate its performance by measuring the absolute frequencies of five transitions of H3+.

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Paper No.  2015-FRI-P0501-P011
Yao-Ting Chiang Award Candidate Cataract degree discrimination by myopia retinal imaging technique


In this study, we developed retinal imaging technology by establishing a human eye module with ray tracing. Periodic hole arrays in different degrees were constructed on the anterior surface of the lens to emulate the eyesight decline caused by cataracts.

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Paper No.  2015-FRI-P0501-P012
Yen-Yin Li Efficient Side-coupling of LD Array into 250-μm Double-clad Fiber using Sub-wavelength Grating


Up to 60% of coupling efficiency from an 1-cm-width 976-nm laser diode array into a 250-μm-diameter double-clad fiber was demonstrated using an electron-beam fabricated sub-wavelength grating. Further improvement is possible by employing the genetic algorithm on the grating design to reduce the impact of the secondary diffraction loss from the grating.

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Paper No.  2015-FRI-P0501-P013
Pin Han Chromaticity Variance of Light Guide Plate Due to the Material Dispersion Absorption


This study presents an effect of chromatic dispersion caused by material absorbing when making the large light guide plate (LGP). A simulation was built to show the tail end of light guide plate turned from white to yellow when the length of light guide plate is long. The chromaticity coordinate changes are ∆x=0.012 ∆y=0.023 for 90cm LGP.

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Paper No.  2015-FRI-P0501-P014
Toshio Katsuyama Design and Fabrication of Waveguide-type Red-green-blue Laser Beam Combiners


Ultracompact waveguide-type RGB (Red-Green-Blue) laser beam combiners are studied. The combiner comprises three optical waveguides and three directional couplers. The fabricated combiner shows a combiner efficiency exceeding 70% and the much higher efficiency can be expected. Thus, such waveguide-type combiners can be applied to the actual laser beam eyewear projectors.

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Paper No.  2015-FRI-P0501-P015
Siang-Ru Huang Interferometric Phase Modulation for Increasing Measurement Speed of Optical Coherence Microscopy


This study presents an optical coherence microscope using achromatic sinusoidal phase modulation and four integrating buckets to increase measurement speed and suppress parasitic fringes.

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Paper No.  2015-FRI-P0501-P016
Nguyen Doan Quoc Anh Enhancement of color uniformity and color rendering index by red Y2O3 phosphor for white LEDs


In this paper, the improvement method for the performance of the multi-chip white-light LED (MCW-LED) is proposed. By injected red Y2O3 in phosphor structures with coherence concentration, DCCT and CRI can obtain the expected results.

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Paper No.  2015-FRI-P0501-P017
Yung Chieh Tseng A Capsule Endoscope System with 140o View Angle based on F-number 2.0


A wide-angle lens design of capsule endoscope (CE) with large aperture is proposed in this paper. Aspheric surfaces are used to design a 140˚ wide-angle field of view with F-number 2.0.

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Paper No.  2015-FRI-P0501-P018
Hao-Ren Yen Retinal projection using curved microlens array


Head-mounted displays are much more popular nowadays. Compared with conventional display, retinal imaging display don’t use display surface and project image directly onto the retina of human. In this paper, we use a curved micro lens array to achieve the imaging projection with wide field of view on the retina.

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Paper No.  2015-FRI-P0501-P019
Kuo Zhi Wei Skin feature examination by a Polarization Sensitive and multi-wavelength approach


Polarization has been proven to enhance the image contrast of interest in tissues. In this work, the utilization of polarized light including linearly, circularly, and elliptically polarization with three wavelengths to examine specific skin features was demonstrated. Three features of the skin can be manifested under specific illumination of polarization and wavelength. Moreover, elliptically polarized light utilized in this work reveals the ability to investigate different depths of the skin tissue.

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Paper No.  2015-FRI-P0501-P020
Chuan-Hui Liu Motorcycle LED Headlamp Design


Motorcycle headlamp comprises a LED, an elliptical reflector, a parabolic reflector and a toric lens. Using the toric lens allows to meet the Economic Commission of Europe, regulation No. 113 (ECE R113). Average deviation of the high beam is 14.17% and the optical efficiency is 66.45%.

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Paper No.  2015-FRI-P0501-P021
Wei-Shuo Li Phase Retrieval by using the Transport-of-Intensity Equation with Hilbert Transform


Transport-of-intensity equation (TIE) is a non-iterative, non-interferometric phase retrieval technique. From the phase recovering by solving the TIE with conventional, Hilbert transform and one partial derivative methods, we shows Hilbert transform can provide the smoother phase images with edge enhancement, and can quantitatively determine the phase difference of periodic structures.

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Paper No.  2015-FRI-P0501-P022
Po-Ju Chen Electrically adjustable location of projected image in augmented reality adopting a reflective liquid crystal lens


Augmented reality is a technology, which can be realized by utilizing head mounted display (HMD) to project additional computer generated information on human eyes. We have demonstrated the capability of adjusting the projected information location of HMD with the help of large aperture liquid crystal lens.

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