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Q: Fachverband Quantenoptik und Photonik

Q 19: Ultrashort Laser Pulses: Generation III

Q 19.5: Vortrag

Dienstag, 9. März 2010, 15:00–15:15, F 342

Optical synchronization of femtosecond fiber lasers using a saturable absorber — •Till Walbaum, Petra Gross, and Carsten Fallnich — Institute for Applied Physics, University of Münster, Corrensstr. 2, 48149 Münster

Synchronizing the repetition frequency of pulsed lasers is of interest for data transmission and for pump-and-probe experiments. Furthermore, transfering stability from one laser to another can be useful for frequency metrology, allowing measurements at different locations using the same frequency comb. Due to their fast response time, opical methods should be superior to electronic means.

We set up two separate Erbium fiber lasers in a master-slave-configuration, each mode-locked via nonlinear polarization rotation. Synchronization is achieved using a shared saturable absorber mirror in a free space section. Numerical simulations are used to investigate the interplay of the externally pumped SAM and the NPR-mode-locking mechanism.

In the experiment, depending on the position of intracavity polarization controllers in the slave laser, locking ranges of up to 411 Hz can be achieved. We show that, using a stabilized master laser, stability of the repetition rate can be transfered to the slave laser, and that the difference of the carrier envelope offset frequencies can be measured and changed by detuning the length of the slave laser in locked state.