Abstract
Growth of Yb:S–FAP [Yb3+:Sr5(PO4)3F] crystals is being studied for 1.047μm laser operation. These crystals are not yet routinely available and the growth of high optical quality, low loss crystals poses a challenge due to a number of crystal growth issues, including, cloudiness, bubble core defects, anomalous absorption, low-angle grain boundaries, and cracking. At this time, a growth process has been formulated to simultaneously eliminate or greatly diminish each of the defects to yield high quality material. Laser slabs of dimension 4.0×6.0×0.75cm are being fabricated from sub-scale pieces using the diffusion bonding technique.
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