AA-M. Scanning Real-Time Autocorrelator for Microscopy

Scanning interferometric autocorrelator with a fast delay line is designed for usage in multiphoton microscopy applications. The unit is equipped with both internal and external photodetector units and is capable of pulse duration measurement at sample position.
Possible full wavelength range* 450-2000 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 <1%
Collinear (interferometric and intensity) autocorrelation yes
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
Dimensions 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.

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.

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