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Thorlabs: Autocorrelator for Femtosecond Lasers

Autocorrelator Alignment A1 780

  • Ultrafast Pulse Width Characterization for 650 - 1100 nm
  • For Pulses from 40 fs to 1 ps, or Pulses Down to 15 fs with Precompensation
  • Selectable Gain up to 70 dB to Accommodate Large Range of Input Powers
  • Interferogram Signal Output through BNC
  • Scan Rate of 5 Hz
  • Compact Footprint: 6.90" x 5.53" x 4.82"

Thorlabs' FSAC Interferometric Autocorrelator provides approximate pulse width measurements in the 650 - 1100 nm wavelength range. Well suited for diagnostics of femtosecond Ti:Sapphire lasers, it consists primarily of a modified Michelson interferometer with a nonlinear detector at the output.

A BNC connector outputs the autocorrelation signal, which can be viewed on any oscilloscope with >1.5 MHz bandwidth. An example of the direct output from the FSAC is shown in the graph to the right. A photodiode amplifier with selectable gain from 0 dB to 70 dB provides compatibility with a large range of optical input powers, up to a maximum average power of 150 mW.

Intuitive, easy-to-reach controls on the outside of the enclosure allow the user to optimize the resolution and fringe contrast. The controls for the delay arm enable a full scan range of 50 fs to 10 ps (i.e., ±25 fs to ±5 ps), and a micrometer tunes the detector's position for maximum signal.

Interferometric Autocorrelator G1 780

This interferometric autocorrelation was obtained using teh Thorlabs Octavius® laser.  Precompensating Mirrors were used to chirp the beam prior to entering the autocorrelator.

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