Abstract: Systems and methods are disclosed for tracking the content of building information models. Embodiments include various computer-implemented methods for the tagging of BIM information, and for the monitoring of modification events involving BIM information. In addition, activities involving physical elements associated with BIM information are tracked. Providers of BIM content can tag content prior to distribution, enabling an internet-based service to track usage, enabling improved service to consumers of that BIM content. Designers can tag BIM content and BIM elements for tracking during the useful life of a building. Internet based messaging protocols can be used for communication between web services, client services and client applications. Monitoring and communication services function unattended. The system includes integration with BIM design applications, as well as stand-alone, end user system applications and browser interfaces. Analytic tools can be used to report on the tracking data.

Abstract: The present invention is directed to the creation of optical waveguiding devices from standard optical fibers by the creation of zones of permanently altered refractive index characteristics therein. A high intensity femtosecond laser beam is focused at a predetermined target region in the fiber so as to soften the glass material at the target region. After aligning the focal region with the target region in the fiber there will be relative movement between the focal region and the fiber, which has the effect of sweeping the focal region across the fiber in a predetermined path, so as to create a secondary waveguide path. A portion of the light traveling along the core is removed from the core along the secondary waveguide path such that the device can be utilized as an attenuator, an optical tap, or a polarimeter.

Abstract: The present invention is directed to the creation of zones of permanently altered refractive index characteristics in glass waveguiding devices, including optical fibers and optical waveguides pre-existed in a glass substrate. Such zones in which the refractive index has been permanently altered are created in glass using a very high intensity laser beam which is produced by focusing the light output from an ultrafast pulsed laser at a predetermined target region in the glass. The preferred laser is a Ti:Sapphire amplified, frequency-doubled Erbium-doped fiber laser system, providing light pulses of approximately 100 femtosecond duration, each with an energy of between about 1 nanojoule and 1 millijoule, and preferably at a pulse repetition rate of between 500 Hz and 1 GHz. The repetition rate is chosen to deliver pulses faster than the thermal diffusion time over the dimensions of the volume element being modified.