Portable LIBS, (Laser Induced Breakdown Spectroscopy) systems are capable of real-time material analysis without sample preparation. LIBS systems focus a high peak power laser pulse onto a targeted material to produce a laser spark or plasma. Elemental line spectra is created, collected and analyzed by a fiber spectrophotometer. The line spectra emission data is quickly displayed on a laptop computer display. "Eye-safe" Class I lasers provide for practical in-situ LIBS applications such as detection of malignant skin tissues without the need for eye-protection goggles. This is due to the fact that Megawatt peak power Q-switched lasers operating at 1.54um in the narrow spectral window between 1.5um and 1.6um are approximately 8000 times more "eye-safe" than other laser devices operating in the visible and near infrared.
Fundamental studies on laser ignition have been performed by the US Department of Energy under ARES (Advanced Reciprocating Engines Systems) and by the California Energy Commission under ARICE (Advanced
Reciprocating Internal Combustion Engine). These and other works have reported considerable increases in fuel efficiencies along with substantial reductions in green-house gas emissions when employing laser spark ignition. Practical commercial applications of this technology require low cost high peak power lasers. The lasers must
be small, rugged and able to provide stable laser beam output operation under adverse mechanical and
environmental conditions. New DPSS (Diode Pumped Solid State) lasers appear to meet these requirements. In this work we provide an evaluation of HESP (High Efficiency Side Pumped) DPSS laser design and performance with regard to its application as a practical laser spark plug for use in internal combustion engines.
A method of writing long period grating and a model to explain light coupling between fundamental mode and cladding mode are presented. One athermal hermetic sealing approach is proposed to form hermetic sealing long period fiber grating. A long period fiber grating was designed and written for this experiment. Low temperature glass solder was introduced to seal around the fiber. The sealing and optical performance testing results are discussed.
Next generation networks capable of carrying converged telephone, television (TV), very high-speed internet, and very high-speed bi-directional data services (like video-on-demand (VOD), Game etc.) strategy for Fiber To The Home (FTTH) is presented. The potential market is analyzed. The barriers and some proper strategy are also discussed. Several technical problems like various powering methods, optical fiber cables, and different network architecture are discussed too.
Conventional optical packaging technologies cannot provide low-loss coupling among various mode-mismatched optoelectronic devices in a cost-effective manner. Our approach based on polymeric waveguide technology provides a unique solution that can alleviate the existing coupling losses among various optoelectronics components, including optical fibers, laser diodes, and photodetectors. In this work, the 3D tapered waveguide coupler was simulated to match MT connectors. According to this MT stand-off design, we fabricated and tested waveguide couplers in molded MT-RJ fiber connect ferrules and integrated optical cross-connects with fiber MT-like connectors. Three fabrication technologies for low-loss polymeric waveguides are also discussed here.
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