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Currently, many swimming goggle lenses use optical plates to maintain zero refractive power in air and water. However, people’s widespread use of 3C products has increased myopia significantly, so lenses have a demand for refractive power. Lenses will have different refractive power problems in water and air media. Therefore, we solved the refractive power change in air and water by using a plane Fresnel lens with a diopter to replace plano-concave lenses. In this study, a first-order design was created and then the microstructure of the Fresnel lens was optimized using optical software. The Fresnel lens simulation results showed that the error was within 5%, which was compared with the data using the lensmaker’s equation calculation. For swimming goggles, this error value is tolerable for human vision.

In this study, a rapid and accurate optical axis alignment technique of a reflective beam expander composed of convex and concave off-axis parabolic mirrors was established by using (a) five parallel lasers and (b) shear interferometry. The five parallel lasers are placed on the top, bottom, left, and right sides, and center of the disc fixture, forming a circular symmetrical distribution and parallel to each other. Since the convex and concave off-axis parabolic mirrors are both confocal systems, the central laser of the five parallel laser beams is incident along the optical axis of the reflective beam expander, and the surrounding four beams diverge outward after the first reflection of the convex off-axis parabolic mirror, and these diverging laser beams converge inward after the second reflection of the concave off-axis parabolic mirror, so that the four output beams are parallel to each other, maintaining a circular distribution and a large diameter, but the divergence angle is relatively small relative to the incidence. The optical plate with excellent parallelism is placed in front of the collimated beam at an angle of 45°. The reflected beams on both sides of the optical plate are expected to interfere. In this study, this shear interferometry method was used to measure the collimation of a parallel beam after passing through a reflective beam expander. In this experiment, a HeNe laser was used as the light source, and its wavelength and beam diameter were 0.6328 μm and 3 mm, respectively. The test sample is a beam expander with a magnification of 2× and an incident beam diameter of 3 mm. After 30 repeated tests, the experimental results showed that the beam diameter increased to 5.78 mm and that the magnification accuracy was 96.3%. [ABSTRACT FROM AUTHOR]

The purpose of this paper is to design a portable biometric system that can measure the amount of absorption of the visible collimated beam that passes by the sample to know the absorbance of the sample. The measured object in the system is the gold colloid that the sample produces after a biochemical reaction. After measuring the absorbance of the gold colloid, we can obtain the concentrations of the waiting-measured sample and further obtain the concentration of chemical solution contained in the sample. Normal single optical path system has a sensitivity of 0.5%.The process of the double optical path method increases the opportunities that the visible collimated beam is absorbed, which raise the detection sensitivity of the system to a sensitivity of 0.1%. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 868–871, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23249 [ABSTRACT FROM AUTHOR]

In this paper, we demonstrate a new technology in which we use the near infrared (NIR) electro-optical device and projection method to measure the numerical aperture (NA) of NIR fiber. Using the optical coupler to let the NIR light enter into an optical fiber, the projection pattern is then measured at the distance of L, where the length L and the diameter W of the projection pattern area on screen is recorded. The NA of NIR fiber is computed from the recorded data. This is a fast method for testing NA and can measure the NA deviation to an accuracy of 0.01. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 582–584, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23161 [ABSTRACT FROM AUTHOR]

This article demonstrates a new optical technique, which we apply to the collimating system to measure the parallel degree of CMOS (Complementary Metal-Oxide Semiconductor) image sensor bumping. We research and develop the new adjustable auto-collimating system to simplify the testing of CMOS board alignment and to increase the image quality of the cell phone camera. This method is a non-contact method for testing and can detect the parallel degree deviation to an accuracy of 0.5°. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2283–2285, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22717 [ABSTRACT FROM AUTHOR]