Patent ID: 7764719

Claim:
A fiber laser system capable of simultaneously generating linearly-polarized laser radiation with peak powers from 10 kW to 500 kW, wavelengths of 1015-1085 nm, pulses with durations of 100 ps to 10 ns, pulse train repetition rates of 1 kHz to 10 MHz, average powers of 10-300 W, spectral bandwidth less than 0.5 nm, and a predominately single spatial mode, the fiber laser system comprising: a master oscillator configured to generate linear polarized infrared laser radiation with wavelengths of 1015-1085 nm, pulses with durations of 100 ps to 10 ns, pulse train repetition rates of 1 kHz to 10 MHz, spectral bandwidth less than 0.5 nm, and a predominately single spatial mode; a polarization-maintaining optical isolator optically coupled to the master oscillator; and a fiber amplifier system optically coupled to the optical isolator and including a power amplifier configured to amplify the linear polarized infrared laser radiation transmitted through the optical isolator, the power amplifier comprising: a polarization-maintaining, large-mode-area, multiple-clad Yb-doped gain fiber having a core, an inner cladding, and at least an outer cladding; one or more diode pump lasers emitting pump light of nominal wavelength of 976 nm; and a pump coupler configured to couple the pump light into the inner cladding of the gain fiber.