Multi-kilowatt peak power nanosecond Er-doped fibre laser

Abstract

 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.

Monolithic high-average-power linearly polarized nanosecond pulsed fiber laser with near-diffraction-limited beam quality

“…Email: zhoupu203@163.com to satisfy the application demand. So, the master oscillator power amplifier (MOPA) configuration is usually employed for high power scaling [22,[24][25][26] . In 2014, Su et al realized a kW-level ns fiber MOPA, which is the highest output power of the all-fiberized ns fiber laser with a random polarization up to now [26].…”

“…However, the output power of the methods directly based on either -switching or external modulation is generally too low to satisfy the application demand. So, the master oscillator power amplifier (MOPA) configuration is usually employed for high power scaling [22, 24–26] . In 2014, Su et al.…”