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AA-M. Scanning Real-Time Autocorrelator for Microscopy

● External and internal photodetectors
● Scan rate 0.1-20 Hz
● USB connection and software in the standard package
● Bypass function for internal detector beam path
● Fringe-resolved autocorrelation function

    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.

    The autocorrelator may cover various wavelength ranges, as well as combine 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 20 fs to 12 ps 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.


Biological Imaging

  • Two-Photon (Multiphoton) Microscopy (TPE)

  • SHG/THG (second/third harmonic generation) microscopy

Time-Resolved Ultrafast Studies

  • Optical Coherence Tomography

  • Fluorescence Spectroscopy of Biological Markers

  • Pump-Probe Spectroscopy

Laser Systems Design, Integration and Amplification

Ultrafast Laser Diagnostics, Accessories and Components

  • Femtosecond Oscillator Pulse Duration Measurement

  • Femtosecond Pulse Duration Measurement and Dispersion Characterization

  • Comparison of Dispersion Values, Determining Dispersion of Various Optical Elements

  • Femtosecond and Picosecond Pulse Duration and Near Contrast Measurement

  • Femtosecond and Picosecond OPA Pulse Duration and Near Contrast Measurement



Possible full wavelength range*

450-3200 nm


(exchangeable photodetectors/beam splitter sets)

V**: 450-700 nm

R1: 700-1300 nm

R2: 1300-2000 nm

Input pulse duration range

20 fs -12 ps 

Number of photodetectors for one range

two (internal and external for sample position)

Input pulse repetition rate

>10 kHz

Typical sensitivity (Pav*Ppeak)

100 mW2

Input polarization

linear, horizontal (vertical upon request)

Scan rate

0.1-20 Hz

Linear distortion


Collinear (interferometric and intensity) autocorrelation


PC connection

USB, Windows PC acquisition and analysis software 

is included in the standard package

Necessary equipment

Windows PC platform or an oscilloscope

Signal source and detector

Two-photon conductivity in semiconductor


210x164x132 mm (optical unit)

225x190x45 mm (control unit)

70х55х16.5 mm (external photodetector)

* - the autocorrelator may cover one, two or all three subranges with exchangeable photodetectors/beam splitter sets

 (1, 2 or all 3 sets may be included in the package depending on required laser source specifications);

** - the 450-700 nm subrange may only be purchased with the main unit order.