Welcome to the market leader in ultrafast pulse diagnostics. With a history of more than 30 years in designing and manufacturing autocorrelators, APE Berlin have led the way in commercializing this technology and in creating reliable, robust and easy to use devices. More than 4000 instruments have been shipped worldwide, with customers in more than 60 countries, thousands of research laboratories and many industrial applications.

Revealing Pre-pulses, Post-pulses, Pedestals, Satellites

With a high dynamic range of 107, the pulseCheck SM Type 2 is ideally suited for the characterization of high-intensity, high-repetition rate laser pulses, such as the used in material processing or in ultra-high intensity light-matter interaction experiments.

Pulse Quality Online Monitoring & Data Logging

High contrast measurements with the Autocorrelator pulseCheck SM Type 2 autocorrelator provide information about how far in time and intensity the main pulse is accompanied by pre-pulses, post-pulses and pedestals.

Pulse Characterization with Frequency-resolved Optical Gating

Second Harmonic Generation FROG is the most popular spectrometer-less frequency-resolved optical gate method. Most of APE’s pulseCheck autocorrelators optionally integrate FROG and enable complete pulse characterization. The addition of a dedicated nonlinear crystal module and special software opens the door to complete spectral and temporal pulse characterization. The FROG option allows the pulseCheck to measure the spectral and temporal bandwidth and phase with just a few adjustments to the autocorrelator.

Spectral Phase Interferometry for Direct Electric-field Reconstruction

Our Spider – Spectral Phase Interferometry for Direct Electric-field Reconstruction – family is designed for phase resolved ultrafast pulse measurements. FC (Few Cycle) Spider offers a precision tool for the complete characterization of ultrashort laser pulses with just a few electric field cycles — sub 5 fs pulse width. For less broadband pulses Spider with grating stretcher is the best choice for pulses between 15 fs and 500 fs at ~ 0.8 µm or 1 µm central wavelength.


Measures laser pulse duration in an optical microscope system. The Carpe autocorrelator allows the pulse duration measurement directly at the microscope sample position. This information allows the precise optimization of e.g. dispersion compensators or pulse compressors, which are used in nonlinear microscopy to achieve the shorted possible pulse duration and best signals in the microscope.