Solid state source for generating intense light for photodynamic therapy and photomedicine
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United States of America Patent
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Aug 11, 1998
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N/A
app pub date -
Jan 24, 1997
filing date -
Jan 24, 1997
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Abstract
This invention teaches an optical source (10) for performing photomedicine. The optical source includes a Nd:YLF laser (12) having an output providing light having a wavelength of 1.053 micrometers; a frequency doubler (13) that is optically coupled to the laser output for converting a portion of the light to frequency doubled light, the frequency doubler having an output providing frequency doubled light having a wavelength of 526.5 nm; and, coupled to the output of the frequency doubler, a unit (14) for shifting the frequency doubled light to light having a wavelength of about 630 nm. In a presently preferred embodiment of this invention the shifting unit includes a device for performing stimulated Raman scattering of the frequency doubled light for creating the third Stokes line at 630.1 nm. The device includes a crystal comprised of a R.sub.x (MO.sub.3).sub.y compound and means for establishing a multi-pass or resonant cavity optical configuration through the crystal. By example, the crystal is comprised of one of Ba(NO.sub.3).sub.2, KNO.sub.3, Ca(O.sub.3), Pb(NO.sub.3).sub.2, and NaNO.sub.3.
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