Abstract -We report a 2-stage diode-pumped Er-doped fibre amplifier operating at the wavelength of 1550 nm at the repetition rate of 10-100 kHz with an average output power of up to 10 W. The 1st stage comprising Er-doped fibre was core-pumped at the wavelength of 1480 nm whereas the 2nd stage comprising doubleclad Er/Yb-doped fibre was clad-pumped at the wavelength of 975 nm. The estimated peak power for the 0.4-nm full width at half maximum (FWHM) laser emission at the wavelength of 1550 nm exceeded 4 kW level. The initial 100-ns seed diode laser pulse was compressed to 3.5 ns as a result of the 34-dB total amplification. The observed 30-fold efficient pulse compression reveals a promising new nonlinear optical technique for generation of high power short pulses for applications in eye-safe ranging and micromachining.
An engineering technique for ultra-jet diagnostics of the state parameters of complex profiles surface layer of polymer composite materials which are obtained by winding or laying is proposed. The possibility of increasing the accuracy of obtaining express-diagnostics results under varying conditions of interaction of the hydro-ultra jet with the test surface is shown.
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