Abstract
In this paper, we report on fiber lasers of transversal-single-mode pulses that have a peak power of 10kW and pulse width of 1.5ns, operating in the 1550nm band. The laser consists of dual stage Er doped fiber amplifiers that uses a newly developed Er doped fiber (EDF) designed for high power pulse amplification. Small normalized frequency of the pulse wavelength of less than 1 enables the EDF to have a large mode field diameter for reducing non-linearity and high transmission loss over 1600 nm for reducing stimulated Raman scattering. Output pulse beams focused on a spot diameter of 11 and 4pm is capable of optical intensity of 10 and 80GW/cm2 respectively.
