60-W green output by frequency doubling of a polarized Yb-doped fiber laser.
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 (M2 < or = 1.33) linearly polarized green output. The FOPA produces as much as 2.4 kW 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%.
Liu
Anping
A
Aculight Corporation, Suite 113, 11805 North Creek Parkway South, Bothell, Washington 98011, USA. anping.liu@aculight.com
Norsen
Marc A
MA
Mead
Roy D
RD