. GECO Scanning Autocorrelator.

Scanning Autocorrelator



  • 10 fs – 10 ps pulse duration range
  • 500 nm – 2000 nm wavelenght range
  • Capable to measure outputs from oscillators and OPAs


Operation of GECO is based on noncollinear second harmonic generation in a nonlinear crystal, producing an intensity auto­correlation trace directly related to the input beam pulse duration. There are four filters and two nonlinear crystals available to cover the full 500 nm – 2000 nm range. Filters are placed on an easily changeable wheel with magnetic fixing.

The beam to GECO is directed with the periscope which can be arranged in either polarization-maintaining or polarization-rotating setup, allowing easy measurement of vertically or horizontally polarized pulses. The beam is then split by a broadband metallic beamsplitter, and both beams are directed to a concave mirror, which focuses and combines the beams into a nonlinear crystal, producing a sum-frequency signal of two beams. The intensity of generated sum-frequency is directly related to temporal overlap between two fundamental pulses. By varying the timing difference with a stepping motor GECO can acquire a full intensity autocorrelation trace.

Parameter Value
Input wavelength range 500 – 2000 nm
Temporal resolution 3.33 fs/step, down to 0.3 fs/microstep
Measurable pulse width 10 fs – 10 ps
Minimum average power of radiation 2 – 200 mW @ 1 – 1000 kHz
Detector Si photodiode

Products List

. GECO Scanning Autocorrelator.