Abstract
For many applications in telecommunication, sensing and spectroscopy reliable all-solid state laser light sources are desirable. The great variety of ionic species of the lanthanides with which the host material of fiber lasers may be doped enables to cover the spectral range between 0.9 and 3 pm. Besides tunability a high output power is often desirable calling for an adoption of the fiber design on the beam parameter product of high power diode laser arrays used as pump sources. The recently developed double clad fibers [1] fulfil these demands. The extraction efficiency of these fibers is very high (>90%) but the absorption of the pump light is considerably low due to the unavoidable appearance of gallery modes.
© 1996 Optical Society of America
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