Abstract
Solid-state lasers doped with TM+3 have demonstrated broad tunability over the range 1.88–2.15 μm.1,2 These lasers are useful for medical applications owing to the strong absorption peak in liquid water at 1.94 pm. Tunability has been accomplished with active tuning elements, typically biréfringent filters, in the laser cavity. For simplicity, however, it would be desirable to operate the laser at or near the 1.94-μm absorption peak without an active filter. Here we report tunabilty of a Tm+3:YALO laser to the 1.94-μm absorption peak without the use of a filter element. The tunability is effected by controling the relative magnitude of the quasithree-level reabsorption loss compared to the output transmission loss. To our knowledge this is the first demonstration of a cw 2-μm Tm+3:YALO laser.
© 1992 Optical Society of America
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