TM:Yalo, 1.94-micron, solid state laser

Details TM:Yalo, 1.94-micron, solid state laser TM:Yalo, 1.94-micron, solid state laser

1993-04-28

1995-10-17

Bovernick, Rodney B.

Coherent light generators

Particular active media

Insulating crystal

372 18, 372 20, H01S 316

Patent

active

054597455

ABSTRACT:
A thulium-doped solid state laser is provided capable of operation at a wlength having a shallow absorption depth in tissue. The laser is comprised of a laser cavity defined by first and second reflecting surfaces opposing each other on an optical axis, a thulium-doped YALO crystal disposed in the cavity, and a pump source for pumping the crystal with a pump beam at a preselected wavelength to enable the crystal to emit a most preferred 1.94 micron laser output. The thulium-doped YALO crystal is preferably an a-cut crystal. Such alignment of this material provides a reliable mode at 1.94 microns which has excellent tissue absorption characteristics for medical applications. The length l of the crystal, the concentration N of the dopant and the transmissivity T of the output coupler, which define an expression Nl/T, can be varied as long as the expression Nl/T produces a value which does not exceed about 0.32 centimeters.

REFERENCES:
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patent: 4967416 (1990-10-01), Esterowitz et al.
patent: 4969150 (1990-11-01), Esterowitz et al.
patent: 5003547 (1991-03-01), Esterowitz et al.
patent: 5107509 (1992-04-01), Esterowitz et al.
patent: 5206867 (1993-04-01), Esterowitz et al.

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