Abstract
We report a picosecond fiber MOPA pumped supercontinuum source with 39 W output, spanning at least 0.4-2.25 microm at a repetition rate of 114.8 MHz. The 2m long PCF had a large, 4.4 microm diameter core and a high-delta design which led to an 80% coupling efficiency, high damage threshold and rapid generation of visible continuum generation from the picosecond input pulses. The high and relatively uniform power density across the visible spectral region was approximately 31.7 mW/nm corresponding to peak power density of approximately 12.5 W/nm for the 21 ps input pulses. The peak power density was increased to 26.9 W/nm by reducing the repetition rate to 28 MHz. This represents an increase in both average and peak power compared to previously reported visible supercontinuum sources from either CW pumped or pulsed-systems.
Highlights
Photonic crystal fibers (PCF) with high non-linearities and tailored dispersion profiles have been widely used for supercontinuum generation [1, 2]
Travers et al [3] demonstrated a supercontinuum source pumped by a 400 W CW laser at 1.07 μm with either 50 W average output power in the region of 1.05-2.2 μm or 28 W covering 0.6 – 1.9 μm spectral region with power densities varying between 2 mW/nm in the visible and ~30 mW/nm in the infrared
We present a picosecond fiber MOPA pumped supercontinuum source with high optical-to-optical conversion efficiency of ~68%, covering from 0.4-1.75 μ m with an output power as high as 39 W at an incident pump power of 57 W with relatively uniform spectral power density over 30 mW/nm
Summary
Photonic crystal fibers (PCF) with high non-linearities and tailored dispersion profiles have been widely used for supercontinuum generation [1, 2]. Travers et al [3] demonstrated a supercontinuum source pumped by a 400 W CW laser at 1.07 μm with either 50 W average output power in the region of 1.05-2.2 μm or 28 W covering 0.6 – 1.9 μm spectral region with power densities varying between 2 mW/nm in the visible and ~30 mW/nm in the infrared. We present a picosecond fiber MOPA pumped supercontinuum source with high optical-to-optical conversion efficiency of ~68%, covering from 0.4-1.75 μ m with an output power as high as 39 W at an incident pump power of 57 W with relatively uniform spectral power density over 30 mW/nm
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