Hybride Konzepte für kurz- und ultrakurzgepulste Hochleistungs-Laserstrahlquellen mit dynamisch adaptiver Repetitionsrate und Impulsdauer (English shop)

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This work addresses the realization of adaptive laser sources with high average power in the 100 W range for laser micromaterial processing, whose pulse duration and pulse repetition rate can be dynamically adjusted during operation. This was achieved through the hybrid combination of rapidly modulable InGaAs single-stripe diode lasers for pulse generation with subsequent fiber and solid-state laser amplifiers.

A continuous variability of the pulse duration from 400 ps to 12 ns, with repetition rates in the 100 kHz range, as well as a continuous variability of the repetition rate in the MHz range with pulse durations in the 10 ps range were achieved.

These beam sources enable novel applications, such as the real-time compensation of nonlinear mirror oscillations in laser material processing, whereby burn-in effects are prevented and the need for more complex processing strategies is avoided. This potentially leads to an immense increase in throughput in material processing.

As an example, the suitability of one of the realized systems is demonstrated using a resonant scanner, in which equidistant points are written on a PMMA sample despite the nonlinear deflection velocity. The repetition rate of the laser varies up to 32,000 times per second.