نتایج جستجو برای: optical testing
تعداد نتایج: 598956 فیلتر نتایج به سال:
Wenrui Cai, Dae Wook Kim, Ping Zhou, Robert E. Parks, James H. Burge College of Optical Science, University of Arizona, 1630 E. University Blvd., Tucson, AZ, USA 85721 [email protected] Abstract: Two different approaches (systematically and randomly rotating the CaliBall to calibrate a Fizeau interferometer transmission sphere) are demonstrated with similar calibration results. Thus, the ...
In recent years, we have presented results on the development of erasable gratings in silicon to facilitate wafer scale testing of photonics circuits via ion implantation of germanium. Similar technology can be employed to develop a range of optical devices that are reported in this paper. Ion implantation into silicon causes radiation damage resulting in a refractive index increase, and can th...
This paper describes an innovative packaging technique for versatile backside optically testing chips that require wire bonding. Since both electrical connections to the device under test and optical access through the silicon substrate are required, the sample preparation for testing the chip becomes a key issue. In fact, the thinned die is very fragile and a specific holder is necessary. The ...
Three simple and low-cost configurations of handheld scanning probes for optical coherence tomography have been developed. Their design and testing for dentistry applications are presented. The first two configurations were built exclusively from available off-the-shelf optomechanical components, which, to the best of our knowledge, are the first designs of this type. The third configuration in...
in this paper, based on the coupled-mode and carrier rate equations, a dynamic model and numerical analysis of a multi quantum well (mqw) chirped distributed feedback semiconductor optical amplifier (dfb-soa) all-optical flip-flop is precisely derived. we have analyzed the effects of strains of qw and mqw and cross phase modulation (xpm) on the dynamic response, and rise and fall times of the ...
As part of the IMAC Technology Center a exhibition of continuously scanning laser, digital image correlation and photogrammetry modal testing will be presented. This paper is the “kick off paper” in a special session on these optical testing methods which offer the possibility of very high spatial resolution with 3 to 6 degrees of freedom at each spatial point and which have tremendously reduce...
BACKGROUND This study investigated prescription spectacles ordered from online vendors and delivered directly to the public for compliance with the optical tolerance and impact resistance requirements for eyewear dispensed in the United States. METHODS Ten individuals ordered 2 pairs of spectacles from each of 10 of the most visited Internet vendors, totaling 200 eyewear orders. Spectacles or...
Abstract: WDM transmission performance can be monitored efficiently by blind signal separation methods based on higher-order statistics for WDM-channel extraction. Relative to a recent method, our procedure has reduced complexity, no stability problems, and better performance. c © 2002 Optical Society of America OCIS codes: (060.4510) Optical communications; (070.6020) Signal processing; (070.6...
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