Berlin 2005 – scientific programme

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K: Kurzzeitphysik

K 5: Neue Verfahren / Hochdruckphysik

K 5.4: Talk

Wednesday, March 9, 2005, 12:00–12:20, HU 3092

Low jitter laser source at arbitrary low repetition rates for electro-optical sampling — •Vadim Eisner, Holger Quast, Christian Meuer, and Dieter Bimberg — Technische Universität Berlin, Institut für Festkörperphysik, Sekretariat PN 5-2, Hardenbergstrasse 36, 10623 Berlin

For a number of time resolved optical measurement techniques such as electro-optical sampling, low jitter ultra-short optical pulses at low repetition rates are precondition. The generation of such pulses from a gain-switched semiconductor laser diode (LD) is desirable. Unfortunately, when the repetition rate of the optical pulse is less than the frequency of the relaxation oscillation of LD, typically several GHz, timing jitter appears conspicuously. In this talk, a new set-up to generate low jitter single mode laser pulses at arbitrary repetition rates using a pulsed distributed feedback (DFB) laser diode for external injection seeding will be presented. Based on simple gain-switching technique, picosecond pulses are generated. However, femtosecond pulses are needed to characterise high-performance devices in the 100 GHz range and beyond with an electro-optical measurement system. Therefore a compression scheme has been developed. It consists of a linear pulse compression based on the compensation of the red chirp and a non-linear pulse compression based on soliton compression. We presently obtained pulses of less than 300 fs FWHM at a repetition rate of 400 MHz.