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7 July 1997 Ground-based vapor crystal growth experiments
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We report on a novel computer-controlled experiment set-up for growing organic nonlinear optical (NLO) crystals by effusive- ampoule physical vapor transport (EAPVT). In this approach, incongruent or impurity vapor components are continuously removed from the vicinity of the growing crystal to vacuum. This results in considerably higher transport rates than are obtained in closed ampoule arrangements. As a consequence, crystal growth can be conducted with reduced temperature gradients, which is important for the growth of structurally perfect crystals. We present design considerations for an EAPVT apparatus, its construction, and its application to the growth of single crystals of 4-(N,N-dimethylamino)-3- acetamidonitrobenzene (DAN), an organic NLO material. The insight gained from this ground-based experimental work was used for the design of the flight hardware used aboard the U.S. Space Shuttle.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Maria Ittu Zugrav and Franz Rosenberger "Ground-based vapor crystal growth experiments", Proc. SPIE 3123, Materials Research in Low Gravity, (7 July 1997);


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