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High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 υm wavelength region



Florian B. Adler, Scott A. Diddams


We present a 2-υm frequency comb based on a reliable mode-locked Er:fiber laser with 100 MHz repetition rate. After shifting the spectrum of the amplified Er:fiber comb to longer wavelengths, a single-clad Tm/Ho:fiber is used as a self-pumped pre-amplifier to generate a coherent and broadband spectrum centered at 1.93 υm. Subsequently, a cladding-pumped Tm:fiber amplifier boosts the system to a maximum output power of 4.8 W at 1.96 υm. After compression in a compact grating compressor, our Er:fiber/Tm:fiber hybrid system delivers as much as 2.9 W with a pulse duration of 141 fs. The system’s comb properties are examined via heterodyne measurement.
Optics Letters


fiber amplifiers, fiber lasers, frequency combs, frequency noise, infrared lasers, nonlinear optics, supercontinuum generation, Thulium-doped lasers, ultrashort pulses


Adler, F. and Diddams, S. (2012), High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 υm wavelength region, Optics Letters (Accessed July 22, 2024)


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Created May 1, 2012, Updated February 19, 2017