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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] 

Autocorrelator AA-M

Scanning Autocorrelator AA-M for Multiphoton Microscopy


The AA-M scanning autocorrelator is designed for femtosecond pulse measurement and control during experiments incorporating a microscope or another optical device in the beam path. The autocorrelator measures the duration at the microscope's input as well as at its output at the sample position providing smooth operation and precise experimental results.


Bezeichnungen der Tabs

  • Description
  • Specifications
  • Pictures
Tab 1


  • input pulse duration 20-12000 fs
  • External and internal photodetectors
  • Scan rate 0.1-20 Hz
  • Linear distortion <1%
  • USB connection
  • All-reflective optics
  • Position measurement
  • Fringe-resolved autocorrelation function
  • Frictionless movement
  • Bypass function


  • Multiphoton microscopy
  • Femtosecond pulse duration measurement before and after the pulse undergoes optical dispersion in a microscope or any other optical device
  • Comparison of dispersion values, determining dispersion of various optical elements
The AA-M provides two simultaneous measurement points: one at the focal plane of the microscope and the other being the point where the optical head of the device is placed, i.e. somewhere before the microscope input. The comparison of the pulse duration value obtained in these two measurements determines the pulse broadening introduced due the dispersion of the microscope’s optical elements. In most cases of application of ultra-short pulses in microscopy it is essential to characterize the temporal and spatial profile of the beam in the focal spot of the microscope. These measurements are vital for any experiment as the shorter is the pulse the higher is the efficiency of the nonlinear imaging process (2-photon excitation) and less excitation energy is needed for successful experiment. Such beam characterization is also necessary when determining exposition of the sample. It ensures image optimization and correct intensity level estimation, as incorrect values may even lead to sample damage. Different models of the autocorrelator cover several wavelength ranges, with the AA-MM model combining the ranges by using 3 interchangeable sets of photodetectors and optics. Two separate ranges can also be covered upon request. Input pulse duration ranges from 20fs to 12ps for easy monitoring of different laser systems. The device features USB interface and can be easily hooked up to a PC with Windows OS. The software is supplied with the device and comprises several useful tools. The acquired pulse duration data can be visualized, stored or exported to a .txt or .dat file. Autocorrelation function and final FWHM pulse duration in femtoseconds are calculated and displayed in real-time. Moreover, Gaussian or sech^2 fitting options are enabled, intensity function may also be observed. The statistical viewer feature allows the comparison of data acquired from several separate pulse measurements.
Tab 2
Wavelength range, nm 450-700 (AA-MV)
700-1300 (AA-M)
1300-2000 (AA-MR)
450-2000* (AA-MM)
Number of photodetectors two (incl. one external)
Pulse duration range, fs 20-12000
Input repetition rate >10 kHz
Sensitivity 100 mW2
Input polarization, linear horizontal (vertical upon request)
Scanning rate, Hz 0.1-20
Linear distortion, % <1%
Collinear (interferometric and intensity) autocorrelation yes
PC connection USB
Necessary equipment PC with Windows OS or oscilloscope
Fiber input (optional) FC/PC or FC/APC (other types available upon request)
Signal source and detector Two-photon conductivity in semiconductor
Dimensions, mm 210x164x132 (optical head)
225x190x45 (electronic unit)
70x55x16.5 (external photodetector)
* - model AA-MM may cover either all three ranges (450-2000 nm) or two separate ranges (i.e. 450-1300 or 700-2000) with interchangeable optics and photodetectors (3 or 2 sets included).


Tab 3

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Tab 5
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AA-M Product 
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AA-M dimensions 
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AA-M dimensions 
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AA-M Spektrum 
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AA-M acquisition software Irtac 
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