5.3 W cw output power from a Master Oscillator Power Amplifier at 1083 nm

摘要

A master-oscillator power-amplifier system at λ=1083nm with 5.3 Watt output power and a narrow spectral linewidth was realised. The master oscillator was a distributed Bragg reflector (DBR) laser with a 3-μm wide ridge waveguide (RW) and a total length of 2 mm. The power amplifiers were a 4 mm long antireflection coated tapered laser diodes with 500 μm or 1000 μm long straight RW sections. At a temperature of 40℃ and an injection current of 160 mA, the DBR laser had a wavelength of 1083 nm. The emitted light of the DBR laser was focused into the tapered amplifier with a seed power of up to 36 mW. At 10℃ and at a current through the tapered amplifier of 8.6 A, a maximum output power of 5.3 W was measured. Over the full operating range single longitudinal mode operation at a wavelength of λ=1083 nm was maintained with a side mode suppression ratio better than 35 dB. The vertical far field angle was below 22° (FWHM).