Automated Spotsize Measurement Brian Lenahan Melisa Moore Advised by: Dr. Duco Jansen
Proposal and Expectations Measure the spotsize of a laser Accurate within 10 microns Suitable for 0.1-25mm diameter beam Fully automated 2/24/99
Why We Measure Spotsize Irradiance [W/mm2] Evaluate new materials Gaussian beam profile 2/24/99
Gaussian FEL profile proven to be Gaussian Consistent property of the FEL 2/24/99
Experimental Setup 2/24/99
Spotsize Algorithm Straight-Edge Technique Algorithm b-1 = 0.552 (x10-x90) d = 2Ö2 b-1 wl = d/2 2/24/99
LabVIEW Programming language with graphical interface Common utility for data acquisition & instrument control 2/24/99
Front Panel Layout 2/24/99
Work Completed Reviewed LabVIEW Tutorial & example programs Top - Down Engineering Modified drivers for EPM 2000 and MM 3000 Resolved hardware problems Resolved resolution errors Established communication between the equipment and computer Constructed portable spotsize measurement platform 2/24/99
Current Work Combining individual drivers into overall algorithm Develop movement specifications 2/24/99
Future Work Develop accuracy specifications Resolve any programming complications Produce working model 2/24/99
References LabVIEW Tutorial LabVIEW Reference Manual EPM2000 and MM3000 user manuals Duco Jansen, VU BME professor Hans Pratisto, VU BME post-doc BME 290d Optics Lab handouts 2/24/99