We present a novel optical and mechanical design of an autocorrelator which allows unmatched compactness. The device, capable of measuring laser pulses in the femtosecond regime, consists of the minimum number of elements, resulting in little distortion in pulse shape. A Mach–Zehnder interferometer provides operation for a wide range of input beam directions, making this autocorrelator a reliable tool for femtosecond lasers diagnostics.

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