The frequency doubling of a 110-W linearly polarized diffraction-limited Yb-doped fiber oscillator power amplifier (FOPA) has generated 60-W near-diffraction-limited M^2 < or = 1.33 linearly polarized green output. The FOPA produces as much as 2.4kW of peak power and less than 20-pm linewidth at a 10-MHz repetition rate and 5-ns pulse duration without the onset of nonlinear effects. With two lithium triborate crystals at noncritical phase matching, a maximum of 54.5% doubling efficiency has been demonstrated. The overall electrical efficiency to the green portion of the spectrum is 10%.
© 2005 Optical Society of America
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4480) Lasers and laser optics : Optical amplifiers
(190.2620) Nonlinear optics : Harmonic generation and mixing
Anping Liu, Marc A. Norsen, and Roy D. Mead, "60-W green output by frequency doubling of a polarized Yb-doped fiber laser," Opt. Lett. 30, 67-69 (2005)