Er:YLF diode pumped solid-state laser with high optical efficiency and brightness was designed, built and tested. Pulsed
multi-frequency generation at a number of wavelengths in 2.66-2.85 μm range was theoretically analyzed and
experimentally investigated. An effective computational model used for Er:YLF laser optimization that accounts for the
generating spectrum was developed.
A custom designed compact, high brightness diode laser array stack was designed and manufactured using
proprietary methods that are robust and suitable for low cost manufacturing. The diode laser stack consisted of four 10
mm-wide diode laser bars having lasing wavelength of 970 - 980 nm mounted onto high performance submounts
separated by approximately 1mm. Each diode laser bar had a 50% fill factor. The cooling methodology employed used a
combined passive and active scheme and not the traditional more expensive and more complicated standard microchannel
coolers used for high duty cycle applications. The total combined optical power attained from the diode array
stack was close to 1 kW for current levels up to 220 A, limited only by the capability of the power supply.
In this paper, we summarize the performance results for this diode laser array and analyze the maximum
expected optical performance as a function of operating current and pulse width and junction temperature limit.
Image-based digital documents are composed of multiple pages, each of which may be composed of multiple components such as the test, pictures background, and annotations. We describe the image structure and software architecture that allows the DjVu system to load and render the required components on demand while minimizing the bandwidth requirements, and the memory requirements in the client. DjVu document files are merely a list of enriched URLs that point to individual files (or file elements) that contain image components. Image components include :text images, background images, shape dictionaries shared by multiple pages, OCRed text, and several types of annotations. A multithreaded software architecture with smart caching allows individual components to be loaded and pre-decoded and rendered on-demand. Pages are pre-fetched or loaded on demand, allowing users to randomly access pages without downloading the entire document, and without the help of a byte server. Components that are shared across pages (e.g. shape dictionaries, or background layers) are loaded as required and cached. This greatly reduces the overall bandwidth requirements. Shared dictionaries allow 40% typical file size reduction for scanned bitonal documents at 300dpi. Compression ratios on scanned US patents at 300dpi are 5.2 to 10.2 times higher than GroupIV with shared dictionaries and 3.6 to 8.5 times higher than GroupIV without shared dictionaries.
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