Abstract
A 250-µm-diameter fiber of ytterbium-doped ZBLAN
(fluorine combined with Zr, Ba, La, Al, and Na) has been cooled
from room temperature. We coupled 1.0 W of laser light from a
1013-nm diode laser into the fiber. We measured the temperature of
the fiber by using both fluorescence techniques and a
microthermocouple. These microthermocouple measurements show that
the cooled fiber can be used to refrigerate materials brought into
contact with it. This, in conjunction with the use of a diode laser
as the light source, demonstrates that practical solid-state laser
coolers can be realized.
© 2001 Optical Society of America
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