title: High-power frequency comb in the range of 2-2.15  μm based on a holmium fiber amplifier seeded by wavelength-shifted Raman solitons from an erbium-fiber laser.
abstract: We demonstrate a room-temperature high-power frequency comb source covering the spectral region from 2 to 2.15 μm. The source is based on a femtosecond erbium-fiber laser operating at 1.55 μm with a repetition rate of 250 MHz, wavelength-shifted up to 2.06 μm by the solitonic Raman effect, seeding a large-mode-area holmium (Ho) fiber amplifier pumped by a thulium (Tm) fiber laser emitting at 1.94 μm. The frequency comb has an integrated power of 2 W, 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 32 kHz over 1 ms observation time, with a signal-to-noise ratio in excess of 30 dB.
authors.forename: Nicola
authors.initials: N
authors.lastname: Coluccelli
authors.forename: Marco
authors.initials: M
authors.lastname: Cassinerio
authors.forename: Alessio
authors.initials: A
authors.lastname: Gambetta
authors.forename: Paolo
authors.initials: P
authors.lastname: Laporta
authors.forename: Gianluca
authors.initials: G
authors.lastname: Galzerano
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006695:Holmium / Q000737:chemistry*; D007259:Infrared Rays; D053844:Lasers, Solid-State; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*
chemical_list: D006695:Holmium