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Diamond Radiator Thinning Using an Excimer Laser (view source)
Revision as of 22:25, 15 December 2016
, 22:25, 15 December 2016→Laser Beamline
Figure 1 illustrates the arrangement of the ablation set up. A series of quartz plates are positioned immediately in front of the laser aperture so that a small sample of the beam (<5%) is reflected onto two separate energy meters labeled energy meter 1 and energy meter 2. Energy meter 1 is part of the laser’s on board energy feedback system which is used to control the output energy and stabilize the pulse-to-pulse variation to within 5%. Energy meter 2 measures each laser pulse incident on the diamond target during the ablation process.
Figure 1 illustrates the arrangement of the ablation set up. A series of quartz plates are positioned immediately in front of the laser aperture so that a small sample of the beam (<5%) is reflected onto two separate energy meters labeled energy meter 1 and energy meter 2. Energy meter 1 is part of the laser’s on board energy feedback system which is used to control the output energy and stabilize the pulse-to-pulse variation to within 5%. Energy meter 2 measures each laser pulse incident on the diamond target during the ablation process.
[[Image:spherabs.png|right|thumb|300px|Zygo image of pulses made on diamond after passing through a single focusing lens.]] [[Image:goodfocus.png|right|thumb|300px|Zygo image of pulses made on diamond after passing through the three lens system.]]
[[Image:spherabs.png|right|thumb|200px|Zygo image of pulses made on diamond after passing through a single focusing lens.]] [[Image:goodfocus.png|right|thumb|200px|Zygo image of pulses made on diamond after passing through the three lens system.]]
Figure 5a shows two columns of broad asymmetric patterns in a diamond sample cut using only a single lens for a varying number of laser pulses. If the focal spot that created these patterns was rastered over an entire diamond it would result in a radiator with large surface variations rendering it unusable for GlueX.
Figure 5a shows two columns of broad asymmetric patterns in a diamond sample cut using only a single lens for a varying number of laser pulses. If the focal spot that created these patterns was rastered over an entire diamond it would result in a radiator with large surface variations rendering it unusable for GlueX.