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Q: Quantenoptik und Photonik

Q 56: Festkörperlaser I

Q 56.9: Vortrag

Dienstag, 8. März 2005, 18:30–18:45, HU 1072

Tailored Pulse Trains from a Mode-Locked SBS-Laser for Materials Processing Purposes — •Philip Kappe, Martin Ostermeyer, and Ralf Menzel — University of Potsdam/ Institute of Physics/ Chair of Photonics/ Am neuen Palais 10/ 14469 Potsdam

We present a Nd:YAG-laser simultaneously emitting pulse structures on microsecond, nanosecond and picosecond timescales. Within a pump pulse of several 100 µs duration a non-linear mirror based on stimulated Brillouin scattering (SBS) generates several Q-switch pulses. The phase conjugating effect of the SBS-reflector also provides a compensation of phase distortions generated inside the laser rod, resulting in transverse fundamental mode operation. Additional acusto-optic loss modulation inside the resonator leads to mode-locking. As a result each Q-switch pulse is subdivided into several picosecond pulses [1].

The temporal output parameters of the laser such as pulse duration, pulse separation and number of pulses per pulse train as well as pulse energies can be easily adjusted by varying the pump parameters and the resonator loss. Energies of up to 2 mJ for the mode-locked pulses with durations between 220 and 800 ps are demonstrated. The wide variability of the laser’s temporal output parameters as well as its high beam quality make it a splendid tool for fundamental research in laser materials processing.

[1] P. Kappe, M. Ostermeyer, R. Menzel, Active Mode-Locking of a Phase Conjugating SBS-Laser-Oscillator, accepted for publication in Appl. Phys B.