Abstract
We demonstrate a room-temperature high-power frequency comb source covering the spectral region from 2 to 2.15μm. The source is based on a femtosecond erbium-fiber laser operating at 1.55μm with a repetition rate of 250MHz, wavelength-shifted up to 2.06μm by the solitonic Raman effect, seeding a large-mode-area holmium (Ho) fiber amplifier pumped by a thulium (Tm) fiber laser emitting at 1.94μm. The frequency comb has an integrated power of 2W, with overall power fluctuations as low as 0.3%. The beatnote between the comb and a high-spectral-purity, single-frequency Tm-Ho laser has a linewidth of 32kHz over 1ms observation time, with a signal-to-noise ratio in excess of 30dB.
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