Collaborating for Success! Building a Digital Learning Object Repository

At the Florida State College at Jacksonville, the Library and the Center for e-Learning collaborated to build a searchable repository of digital learning objects for faculty to easily locate and upload into their courses. In this program, the presenters will address how to create instructional information for online students in a format that is understandable, usable and accessible. Additionally, they will outline the way they developed an authoritative system of tagging and organizing these resources

Laser‐Assisted Vas Anastomosis: A Preliminary Report

A new technique is described for performing vas anastomoses in experimental animal (rats). A low‐power CO2 laser appears to be effective in welding together the cut ends of the divided vas deferens

Performance Predictions for the Adaptive Optics System at LCRD's Ground Station 1

NASA's LCRD mission will lay the foundation for future laser communication systems. We show the design of the Table Mountain ground station's AO system and time series of predicted coupling efficiency

Conceptual Design of the Adaptive Optics System for the Laser Communication Relay Demonstration Ground Station at Table Mountain

The Laser Communication Relay Demonstration will feature a geostationary satellite communicating via optical links to multiple ground stations. The first ground station (GS-1) is the 1m OCTL telescope at Table Mountain in California. The optical link will utilize pulse position modulation (PPM) and differential phase shift keying (DPSK) protocols. The DPSK link necessitates that adaptive optics (AO) be used to relay the incoming beam into the single mode fiber that is the input of the modem. The GS-1 AO system will have two MEMS Deformable mirrors to achieve the needed actuator density and stroke limit. The AO system will sense the aberrations with a Shack-Hartmann wavefront sensor using the light from the communication link's 1.55 microns laser to close the loop. The system will operate day and night. The system's software will be based on heritage software from the Palm 3000 AO system, reducing risk and cost. The AO system is being designed to work at r(sub 0) greater than 3.3 cm (measured at 500 nm and zenith) and at elevations greater than 20deg above the horizon. In our worst case operating conditions we expect to achieve Strehl ratios of over 70% (at 1.55 microns), which should couple 57% of the light into the single mode DPSK fiber. This paper describes the conceptual design of the AO system, predicted performance and discusses some of the trades that were conducted during the design process