Fire drill!? Don't worry we still got our spot size measurements.
We continued doing more knife-edge scans at different input focal distances, just to see if we could get any better results with smaller astigmatism. Unfortunately, we weren't very successful. We could not obtain any results for the x scans at 204mm or 205mm. However, we were able to obtain results from our y scans at 204mm and 205mm that continued the pattern that we would have expected to see due to our previous results at smaller IFDs. We then graphed all of our data points in excel using our designated computer at XOS to see the trend in our data easier. According to our results, the IFD of 203mm had the least astigmatism and spot size. Then we ran official scans to get the real spot size. These scans were run at a preset time of 10 seconds and took much longer. The higher preset time was to achieve a much high background ratio. We also had to focus on a very narrow section of the the original curve when finding the correct range of values to scan at. Our official spot sizes: horizontal- 69.5 microns, vertical- 51.85 .
No comments:
Post a Comment