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Linearly polarized high-power fiber lasers with monolithic PM-LMA-fiber and LMA-grating based cavities and their use for nonlinear wavelength conversion

: Khitrov, V.; Samson, B.; Manyam, U.; Tankala, K.; Machewirth, D.; Heinemann, S.; Liu, C.; Galvanauskas, A.


Durvasula, L.N. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber lasers II: Technology, systems, and applications : 24 - 27 January 2005, San Jose, California, USA
Bellingham/Wash.: SPIE, 2005 (SPIE Proceedings Series 5709)
ISBN: 0-8194-5683-7
Photonics West Conference <2005, San Jose/Calif.>
Conference Paper
Fraunhofer ILT ()

We report our recent progress in designing and manufacturing new, completely monolithic, linearly polarized, continuous wave (CW) fiber lasers that provide more than 300W of output power in a near diffraction limited, single transverse mode, spectrally stabilized output beam having a narrow line-width. The demonstrated design is simple and practical: The monolithic laser cavity may consist of only a coil of polarization maintaining (PM), large mode area (LMA) active fiber having a fiber Bragg grating (FBG) at one end and a fiber cleave at the other end. Proper selection of the coil diameter enables gain in only one polarization mode so as to provide the linearly polarized output. Fiber lasers built using this novel technique do not require any external polarizing components or the use of polarizing fiber. Such compact and robust fiber lasers are suitable for a variety of applications, such as multi-kW power scaling through coherent beam combining, nonlinear wavelength c onversion processes using a variety of nonlinear materials, etc.