Optical purification of crystals
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United States of America Patent
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May 7, 2013
Grant Date -
Aug 5, 2010
app pub date -
Jan 18, 2008
filing date -
Jan 30, 2007
priority date (Note) -
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Abstract
Method for preparing a purified crystal for use in an optical component, from an impure crystal having impurities or crystal defects capable of causing a specific absorption of incident light, includes heating the impure crystal to a temperature at which ions in the crystal are mobile and provide conductivity. A part of the crystal is illuminated with an electromagnetic purifying beam having a frequency in or near a visible frequency range so as to optically excite and migrate charges in the crystal, the charges being compensated by a counter-migration of the ions so as to be fixed in place thereafter so as to provide a purified crystal zone. The crystal is cooled to a future operating temperature.
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