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Diamond Radiator Development. Brendan Pratt University of Connecticut GlueX Collaboration Meeting, Jefferson Lab, February 2012. Recap from 2011. Excimer Laser refurbished Translation Stage Vacuum Chamber Constructed Optics and Railing Purchased

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diamond radiator development

Diamond Radiator Development

Brendan Pratt

University of Connecticut

GlueX Collaboration Meeting, Jefferson Lab, February 2012

recap from 2011
Recap from 2011
  • Excimer Laser refurbished
  • Translation Stage
  • Vacuum Chamber Constructed
  • Optics and Railing Purchased
  • Chiller (allows for rep rate >3Hz, max 50Hz)
  • External Triggering circuit designed and built
  • Data Acquisition Card for pulse measurement
  • LabView program written
  • Made our first cuts into Diamond in October 2011
results from 2011
Results From 2011

Skewed Spot due to Spherical Abberations in Optics

old optics
Old Optics
  • Single Fused Silica focusing lens creates large spherical aberrations in spot.
new optics
New Optics

Finally, the light is focused

Through L3, a fused silica lens

With a large radius of curvature (34.5mm)

Onto the target

First the laser beam is expanded

Setting L1 and L2’s focal lengths at the

Same point

The “Point” is then imaged through

L2, creating a parallel beam

L1

L2

L3

results
Results
  • This is where I’ll put a picture of a single blast site.
using raster program
Using Raster Program

10 steps @

0.05mm increments

14 rows @ 0.05mm increments

slide8
0.5mm

0.9mm

0.7mm

slide9
Trenches show 0.05mm step

After each carriage return

single horizontal cut
Single Horizontal Cut

Milling Depth

0.8mm

summary
Summary
  • Laser is operating at above ablation energies for hours of run time
  • Automation of milling cycle is complete
  • Beam spot has been “cleaned” of spherical aberrations
  • Will begin milling 20micron diamonds within the next 6 months.
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