Research of mode selection in a coiled Yb3+ doped multimode double clad fiber laser
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Received Date:
2006-09-19
Accepted Date:
2007-01-25
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Abstract
In order to realize the monomode output in large core multimode double-clad fiber laser to suppress the nonlinear effects in high power double-clad fiber lasers,mode selection by bending the large core multimode double-clad fiber to a suitable radius was used.Theoretical analysis and experiments about mode selection in large core multimode double-clad fiber laser were demonstrated in this paper.Factors that influence the laser bending loss and output mode,such as inner-clad refractive index,core radius,laser wavelength,bending radius,were obtained.Monomode output was obtained from multimode double-clad fiber laser by bending the homemade Yb3+-doped large core multimode fiber.The laser has a fundamental mode output with power of 9W,conversion efficiency of 17.3%.The research is useful in mode selection from large core multimode double-clad fiber laser.
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