Abstract

Several nonlinear microscopy and spectroscopy techniques like SHG, THG, SRS and CARS benefit from pulsed laser systems with tunable central frequency allowing selective excitation of energy levels [1-4]. We present a fiber laser based pulsed two-arm laser system which is compact, robust, cost-effective and fully automated with regard to the adjustment of the central frequency. Both arms are seeded by the same fiber oscillator at a repetition rate of 80 MHz and can be temporally overlapped by an internal 500 ps delay. One arm is based on the TOPTICA FemtoFiber ultra 780 and emits pulses at a central frequency of 780 nm with a pulse duration of around 1 ps (FWHM) and an average power of 500 mW.

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