Abstract
The dispersive mirrors with a third order dispersion (TOD) of about −10000 fs3 at the wavelength of 1040 nm and a compensation bandwidth of 20 nm are designed and fabricated with ion beam sputtering (IBS) technique. A good agreement between the measured and calculated group delay dispersion (GDD) and TOD of the mirror is achieved. These mirrors are employed in a Yb-doped femtosecond nonlinear amplification fiber laser system to compensate the residual TOD in the system. We show that after TOD compensation, the system outputs 44 fs laser pulses with little wing at 26.6 W output average power and 531 nJ pulse energy, corresponding to 10.8 MW peak power.
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