Abstract
There have recently been several reports of high-power semiconductor laser sources consisting of a master oscillator monolithically integrated with a power amplifier [1-5]. We report here on a device of this type which gives, to our knowledge, the best combination of high output power and narrow spectral linewidth yet reported for a 1.5 pm semiconductor laser device. Such devices are of interest for intersatellite and fibre optic coherent communications systems and could also find application in RF analogue optic fibre links.
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