Diamond Radiator Fabrication & Assessment Update Brendan Pratt Richard Jones University of Connecticut.

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Presentation transcript:

Diamond Radiator Fabrication & Assessment Update Brendan Pratt Richard Jones University of Connecticut

Outline CHESS RUN UPGRADES NEW RESULTS

CHESS MAY 2014 Visit scheduled for May 28 th -Jun 2 nd Jlab to procure 10 large element6 crystals Have (2) 4.5x4.5mm diamond samples out to Sinmat UConn milled samples (including our inventory of 45 stones)

UPGRADES (software) LabView now runs sweeping raster Moves beam across diamond’s horizontal axis incrementing in y by 0.025mm A run takes about 19 minutes (2.6x2.6mm) Motor acceleration and backlash have been corrected for.

Integrated Arduino based oscillator to control laser pulse train (50Hz) Energy meter records laser energy for each “line” of the diamond All electronics are now encased in aluminum shielding to protect the against large EMP produced by the laser UPGRADES (electronics)

Automatic beam aperture Blocks beam whenever LabView program is not in current use Prevents accidental blemishes caused by misfires of the laser New 45° removable diamond chamber mount Allows for easy removal and replacement from ablation vacuum chamber Keeps diamond in plane with axis of translation UPGRADES (hardware)

A new translation stage was purchased and added to the sharp focusing lens. Allows for sub-micron positioning (12mm overall travel) We can now “chase” the focus as we move farther into the diamond Can now back focus off when reaching <50µm critical thickness UPGRADES (hardware)

Focal Study Cutting rate and beam profile highly dependent on being within the Rayleigh length. Advanced the Z-axis through the focal point while ablating on diamond Zygo images reveal the sharpest focus at 4.8mm (0.0mm farthest from chamber)

Measuring Thickness Knowing how thick your virgin sample is obviously important, but hasn’t been easy to do in the past. Turn diamond samples on edge and image their profiles using the Zygo

U300_25 According to our measurements, this diamond was cut down 275µm. Resulting in an active area that is less than 25µm thick

Thickness Profile Through Diagonal

Surface Variation

U300_20 Diamond Average cut depth >270µm

Surface Variation

Conclusions UConn will be heading down to CHESS in the upcoming week with samples from Sinmat Element 6 Uconn Major upgrades to the ablation facility have been made since the beginning of the Jlab contract The UConn laser ablation facility is producing diamonds with central region thicknesses of <25µm and <1µm surface variation

QUESTIONS?