Thermally controlled lenses for lasers
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United States of America Patent
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-
Jan 31, 1995
Grant Date -
N/A
app pub date -
Feb 10, 1994
filing date -
Feb 10, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for controlling the propagation path of a light beam are disclosed. A lens material having a temperature-dependent index of refraction is positioned in the path of the light beam. A heat source is disposed on one face of the lens material and a heat sink is disposed on the opposite face. A controller regulates the distribution of heat to the heat source and the extraction of heat from the heat sink so that a temperature gradient is formed within the lens material. The temperature gradient creates a refractive-index gradient in the lens material, causing a thermal lensing effect. The device may be used in a laser cavity for controlling laser-beam divergence caused by pump-induced thermal lensing in the gain medium.
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