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
(140.0140) Lasers and laser optics : Lasers and laser optics
(160.5690) Materials : Rare-earth-doped materials
(190.5650) Nonlinear optics : Raman effect
(350.5340) Other areas of optics : Photothermal effects
Anton Rayner, Madeleine Hirsch, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop, "Distributed Laser Refrigeration," Appl. Opt. 40, 5423-5429 (2001)