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31 March 1997 Fiber phase conjugator as reflecting mirror in an MOPA arrangement
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Using stimulated Brillouin scattering (SBS) in glass fibers as phase-conjugating process, the field of applications of SBS phase-conjugators can be expanded, because fibers offer a low power threshold and a stable behavior even at high peak and average input powers. We have developed a new kind of phase-conjugator consisting of multimode quartz fibers with core diameters between 50 and 400 micrometers . In contrast to commonly used toxic liquids or gases under high pressure as SBS-materials, fibers are harmless to the environment and can be handled easily. Such fiber SBS-mirrors were characterized with respect to the phase conjugating parameters like threshold, reflectivity and fidelity. We achieved reflectivities of more than 50 percent, 93 percent fidelity, and less than 2 kW power threshold at 1 micrometers wavelength. A depolarization of the light could be reduced to less than 0.5 percent by proper configuration of the fiber. High power densities of more than 50 MW/cm2 do not damage the phase conjugator. These new phase conjugators were applied in high-power Nd:YALO-MOPA-systems for the first time. Good beam quality at an average output power of more than 100 W was achieved at 1.08 micrometers wavelength.
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Hans Joachim Eichler, Andreas Haase, Jens Kunde, Baining Liu, and Oliver Mehl "Fiber phase conjugator as reflecting mirror in an MOPA arrangement", Proc. SPIE 2986, Solid State Lasers VI, (31 March 1997); doi: 10.1117/12.270009;

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