Optical Frequency Comb Spectroscopy Laboratory @ LLUm

Key laser systems

Er:fiber frequency comb

Laser type: Er:fiber frequency comb system, Menlo Systems FC1500-250-WG, with f-2f interferometer
Parameter summary: : 250 MHz, ~150 fs, 1.55 µm (oscillator and amplifier), 1.55-1.9 µm (with nonlinear fibers), 20 mW (oscillator), 400 mW (amplifier)

C_laser 1 Er fiber combpng

High-power Yb:fiber femtosecond laser

Laser type: Yb:fiber femtosecond laser, Menlo Systems Orange High Power
Parameter summary: : 125 MHz, ~100 fs, 1.06 µm, 2 W

C_laser 2 Yb fiber laserpng

High-power Tm:fiber frequency comb

Laser type: Tm:fiber frequency comb system, IMRA America, with f-2f interferometer
Parameter summary: : 125 MHz, ~100 fs, 1.96 µm, 2 W

laser 3 Tm fiber combpng

Difference frequency generation frequency comb

Laser type: Home-built difference frequency generation source pumped by the Yb:fiber femtosecond laser [Optics Letters 42, 1748 (2017)
Parameter summary: : 125 MHz, ~150 fs, tunable between 2.7-4.2 µm, 150 mW

laser 4 DFG combpng

High power continuous wave optical parametric oscillator

Laser type: Continuous wave optical parametric oscillator, Toptica TOPO
Parameter summary: : narrow linewidth 10 kHz, tunable between 1.45-2.07 µm (signal) and 2.19-4 µm (idler), 1 W (signal), 2 W (idler)

laser 5 CW OPOpng

Key experimental stations

Mid-infrared Fourier transform spectrometer

  • Type of experiment: Precision spectroscopy of molecules in gas phase
  • Description: System consisting of the Yb:fiber-pumped difference frequency generation comb source, multipass cells, and a fast-scanning Fourier transform spectrometer with auto-balanced detection.

  • Parameters: Spectral coverage of the comb 2.7-4.2 µm, spectrometer works up to 10 µm with different comb sources; comb-mode limited resolution ~1 MHz.

    Auxiliary equipment: : Multipass cells: Thorlabs HC10L/M-M02 (10 m, 0.7 L), Aerodyne AMAC-76LW (76 m, 0.5 L); Temperature-stabilized 10 cm single pass cell; Beam profiling camera Pyrocam PY-III-HR-C-A-BGP.
  • Contact person:  Aleksandra Foltynowicz

    1 MIR FTSpng

    1 multipass cellspng

    Double-resonance spectrometer

    • Type of experiment: Precision spectroscopy of hot band transitions of molecules in gas phase.
    • Description: A pump-probe system consisting of the CW OPO (pump) and the Er:fiber comb source (probe), enhancement cavities for the probe, a fast-scanning Fourier transform spectrometer with auto-balanced detection.

    • Parameters: Spectral coverage of the probe 1.5-1.9 µm, comb-mode limited resolution ~100 kHz.

    • Auxiliary equipment: : Enhancement cavities for the probe; Lamb-dip cell for stabilization of the pump; Beam profiling camera Pyrocam PY-III-HR-C-A-BGP.
    • Contact person: Aleksandra Foltynowicz
      2 double resonance setuppng

        2 double resonance FTSpng