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

We present a 2 μm 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 μm. Subsequently, a cladding-pumped Tm:fiber amplifier boosts the system to a maximum output power of 4.8 W at 1.96 μm. After compression in a compact grating compressor, our amplified 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.

[1]  Farzin Amzajerdian,et al.  High-energy 2μm Doppler lidar for wind measurements , 2007 .

[2]  Carsten Langrock,et al.  Supercontinuum generation in quasi-phase-matched LiNbO3 waveguide pumped by a Tm-doped fiber laser system. , 2011, Optics letters.

[3]  Konstantin L. Vodopyanov,et al.  Broadband degenerate OPO for mid-infrared frequency comb generation. , 2011, Optics express.

[4]  Jun Ye,et al.  Mid-infrared Fourier transform spectroscopy with a broadband frequency comb. , 2010, Optics express.

[5]  S. Diddams,et al.  High-power broadband laser source tunable from 3.0 μm to 4.4 μm based on a femtosecond Yb:fiber oscillator. , 2011, Optics letters.

[6]  P. Schunemann,et al.  Mid-IR frequency comb source spanning 4.4-5.4 μm based on subharmonic GaAs optical parametric oscillator. , 2011, Optics letters.

[7]  Michael E. Webber,et al.  Diode-laser absorption measurements of CO2, H2O, N2O, and NH3 near 2.0 μm , 1998 .

[8]  I. Coddington,et al.  Spectroscopy of the methane {nu}{sub 3} band with an accurate midinfrared coherent dual-comb spectrometer , 2011 .

[9]  I. Coddington,et al.  Coherent dual-comb spectroscopy at high signal-to-noise ratio , 2010 .

[10]  Jun Ye,et al.  Phase-stabilized, 1.5 W frequency comb at 2.8-4.8 microm. , 2009, Optics letters.

[11]  M. Fermann,et al.  230-kW peak power femtosecond pulses from a high power tunable source based on amplification in Tm-doped fiber. , 2005, Optics express.

[12]  Jeffrey Y. Beyon,et al.  Novel nonlinear adaptive Doppler-shift estimation technique for the coherent Doppler validation lidar , 2007 .

[13]  Jeffrey A. Squier,et al.  Fourth-order-dispersion limitations of aberration-free chirped-pulse amplification systems , 1997 .

[14]  Oscar E. Martínez,et al.  3000 times grating compressor with positive group velocity dispersion: Application to fiber compensation in 1.3-1.6 µm region , 1987 .

[15]  Scott A. Diddams,et al.  Molecular fingerprinting with the resolved modes of a femtosecond laser frequency comb , 2007, Nature.

[16]  Julien Mandon,et al.  Fourier transform spectroscopy with a laser frequency comb , 2009 .

[17]  T. C. Briles,et al.  Optical frequency comb spectroscopy. , 2011, Faraday discussions.

[18]  Jun Ye,et al.  References and Notes Supporting Online Material Broadband Cavity Ringdown Spectroscopy for Sensitive and Rapid Molecular Detection , 2022 .

[19]  Analysis of trace impurities in semiconductor gas via cavity-enhanced direct frequency comb spectroscopy , 2010, 1003.1314.

[20]  Rick Trebino,et al.  Frequency-resolved optical gating with the use of second-harmonic generation , 1994 .

[21]  Gianluca Galzerano,et al.  1.6-W self-referenced frequency comb at 2.06 μm using a Ho:YLF multipass amplifier. , 2011, Optics letters.

[22]  Young‐Jin Kim,et al.  Er-doped fiber comb with enhanced fceo S/N ratio using Tm:Ho-doped fiber , 2009, CLEO/QELS: 2010 Laser Science to Photonic Applications.

[23]  Alfred Leitenstorfer,et al.  Synthesis of a single cycle of light with compact erbium-doped fibre technology , 2010 .

[24]  Jun Ye,et al.  Cavity-enhanced direct frequency comb spectroscopy: technology and applications. , 2010, Annual review of analytical chemistry.

[25]  P. Maddaloni,et al.  Mid-infrared fibre-based optical comb , 2006 .