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 3/26/99
Why We Measure Spotsize Irradiance [W/mm2] Evaluate new materials Gaussian beam profile 3/26/99
Gaussian FEL profile proven to be Gaussian Consistent property of the FEL 3/26/99
Experimental Setup 3/26/99
EPM 2000 3/26/99
MM 3000 3/26/99
Spotsize Algorithm Straight-Edge Technique Algorithm b-1 = 0.552 (x10-x90) d = 2Ö2 b-1 3/26/99
LabVIEW Programming language with graphical interface Common utility for data acquisition & instrument control 3/26/99
Front Panel Layout 3/26/99
Work Completed Reviewed LabVIEW Tutorial & example programs Modified drivers for EPM 2000 and MM 3000 Resolved hardware problems Resolved resolution errors Established communication between the equipment and computer Combined the EPM 2000 and MM 3000 into overall VI design Completed preliminary testing 3/26/99
Preliminary Testing 3/26/99
Current Work Refining programs Developing full automation 3/26/99
Future Work Develop accuracy specifications More testing Produce working model 3/26/99
References LabVIEW Tutorial LabVIEW Reference Manual EPM2000 and MM3000 user manuals Duco Jansen, VU BME professor Hans Pratisto, former VU BME post-doc BME 290d Optics Lab handouts 3/26/99