NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
ISS-Crystal Growth of Photorefractive Materials (BSO): Critical Design Issues for Optimized Data Extraction from Space ExperimentsRealization of the full potential of photorefractive materials in device technology is seriously impeded by our inability to achieve controlled formation of critical defects during single crystal growth and by difficulties in meeting the required degree of compositional uniformity on a micro-scale over macroscopic dimensions. The exact nature and origin of the critical defects which control photorefractivity could not as yet be identified because of gravitational interference. There exists, however, strong evidence that the density of defect formation and their spatial distribution are adversely affected by gravitational interference which precludes the establishment of quantifiable and controllable heat and mass transfer conditions during crystal growth. The current, NASA sponsored research at MIT is directed at establishing a basis for the development of a comprehensive approach to the optimization of property control during melt growth of photorefractive materials, making use of the m-g environment, provided in the International Space Station. The objectives to be pursued in m-g research on photorefractive BSO (Bi12SiO20) are: (a) identification of the x-level(s) responsible for photorefractivity in undoped BSO; (b) development of approaches leading to the control of x-level formation at uniform spatial distribution; (c) development of doping and processing procedures for optimization of the critical, application specific parameters, spectral response, sensitivity, response time and matrix stability. The presentation will focus on: the rationale for the justification of the space experiment, ground-based development efforts, design considerations for the space experiments, strategic plan of the space experiments, and approaches to the quantitative analysis of the space experiments.
Document ID
20010073729
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Hyers, Robert W.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Motakef, S.
(Cape Simulations, Inc. Newton, MA United States)
Witt, A. F.
(Massachusetts Inst. of Tech. MA United States)
Wuensch, B.
(Massachusetts Inst. of Tech. MA United States)
Whitaker, Ann F.
Date Acquired
August 20, 2013
Publication Date
January 21, 2001
Subject Category
Solid-State Physics
Meeting Information
Meeting: Conference on International Space Station Utilization
Location: Cocoa Beach, FL
Country: United States
Start Date: October 16, 2001
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available