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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] 

Autokorrelator GECO

Scanning Autokorrelator GECO



Der Scanning Autokorrelator GECO ist ein nützliches Werkzeug zur Justage von Femtosekunden-Lasersystemen. GECO zeichnet sich durch einen breiten Messbereich für Pulslängen von 10fs bis 20ps aus. Der messbare Wellenlängenbereich des GECO beträgt 500-2000nm


Bezeichnungen der Tabs

  • Beschreibung
  • Spezifikationen
  • Abmessungen
  • Bilder
Tab 1


  • Measures pulse duration in 10 fs – 20 ps range
  • Single set of optics for 500 – 2000 nm range
  • High resolution voice coil driven delay line
  • Non‑collinear intensity and collinear interferometric autocorrelation traces
  • Onboard pulse‑analysis software for pulse duration measurements
  • Integrated controller and computer
  • Non‑dispersive polarization control
  • FROG and FTIR ready

Operation of GECO autocorrelator is based on noncollinear second harmonic generation in a nonlinear crystal, producing intensity autocorrelation trace directly related to the input beam pulse duration. One arm of the fundamental pulse is delayed by means of a magnetic linear positioning stage, providing fast, reliable motion with < 0.15 fs resolution. GECO can acquire a full intensity autocorrelation trace of 10 fs to 20 ps pulses and covers the full 500 nm to 2000 nm wavelength range.

GECO features noncollinearity angle adjustment and can be simply transformed to a collinear setup, allowing to perform interferometric autocorrelation measurements which are useful for pulses in 10 fs range. Both arms of the autocorrelator have the same dispersion parameters for the most accurate results. It is also possible to switch GECO to Michelson interferometer configuration by simply replacing and removing a few elements, allowing the user to perform FTIR or other desired measurements.

Tab 2

 Performance specification

Input wavelength range, nm 500 – 2000
Temporal resolution  0.13 fs / step
Measurable pulse width   10 fs – 20 ps
Minimum average power of radiation  2-200 mW @1-1000 kHz 
Scan rate 5 scans/second @1-1000kHz
Detector  Si photodiode
Tab 3

Dimensions, mm

Full dimensions 197 W x 295 L x 218 H
Housing    197 W x 220 L x 90 H
Beam interception height 70 - 180
Weight 3,7 kg
Tab 4

Tab 4 Inhalt

Tab 5
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GECO external view 
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Geco new dimensions 
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GECO dimensions 
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