Single-polarization ultra-large-mode-area Yb-doped photonic crystal fiber.
We report on an ytterbium-doped single-transverse-mode rod-type photonic crystal fiber that combines the advantages of low nonlinearity and intrinsic polarization stability. The mode-field-area of the fundamental mode is as large as 2300 microm(2). An output power of up to 163 W with a degree of polarization better than 85% has been extracted from a simple fiber laser setup without any additional polarizing element within the cavity than the fiber itself. The beam quality has been characterized by a M(2) value of 1.2. The single-polarization window ranges from 1030 to 1080 nm, hence possesses an excellent overlap with the gain profile of ytterbium-doped silica fibers. To the best of our knowledge this fiber design has the largest mode-field-diameter ever reported for polarizing or even polarization maintaining rare-earth-doped double-clad fibers.
Friedrich-Schiller University, Institute of Applied Physics, Albert-Einstein-Str. 15, 07745 Jena, Germany. schmidt.oliver@uni-jena.de
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O
Schmidt
J
J
Rothhardt
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T
Eidam
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Röser
J
J
Limpert
A
A
Tünnermann
K P
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Hansen
C
C
Jakobsen
J
J
Broeng
D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008422:Materials Testing; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D015018:Ytterbium / Q000737:chemistry*
D015018:Ytterbium