230-mW diode-pumped single-frequency Er : Yb laser at 1.5 mu m

We report on a diode-pumped Er:Yb laser able to generate a single-frequency output power in excess of 200 mW at both 1.53 mum and 1.56 mum and over 300 mW in multimode operation. The tuning characteristics of the source are reported and discussed, The relative intensity noise presents in all configurations a peak value lower than -92 dB/Hz and its level decreases below - 160 dB/Hz for frequencies higher than 8 MHz.