22 April 2005 120-W linearly polarized single-mode Yb-doped fiber laser and 60-W green by SHG
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We report a 120 W, linearly polarized, single-mode Yb-doped fiber laser operating at 10 MHz pulse repetition rate. To produce narrow linewidth and high peak power, a fiber oscillator power amplifier (FOPA) configuration is used. With an Yb-doped large mode area (LMA) fiber, the FOPA has generated up to 2.4 kW peak power and less than 20 pm linewidth without the onset of nonlinear effects at 5 ns pulse duration. 120 W average output power corresponding to a slope efficiency of 71% with respect to the launched power has been generated. The beam quality is 1.1 times diffraction-limited and the polarization extinction ratio is better than 95%. No linewidth broadening beyond the 20 pm instrumental resolution or nonlinear effects are observed at 120 W output power. The diffraction-limited beam quality from the FOPA allows us to use LBO crystals to achieve efficient second harmonic generation (SHG) without “gray tracking” problems. The frequency doubling of 110 W FOPA output has generated 60 W, near-diffraction-limited, linearly polarized green output. With two LBO crystals at noncritical phase-matching, a maximum of 54.5% doubling efficiency has been demonstrated. The overall electrical efficiency to green output is 10%.
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Anping Liu, Anping Liu, Marc A. Norsen, Marc A. Norsen, Roy D. Mead, Roy D. Mead, "120-W linearly polarized single-mode Yb-doped fiber laser and 60-W green by SHG", Proc. SPIE 5709, Fiber Lasers II: Technology, Systems, and Applications, (22 April 2005); doi: 10.1117/12.591836; https://doi.org/10.1117/12.591836

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