A Gires-Tournois interferometer (GTI) is a reflecting Fabry-Perot interferometer which has a 100% reflecting mirror on the back surface. In principle, for light entering from the front, there is no loss in reflection from the structure, although the device is dispersive. The group velocity dispersion can be used to compress ultrashort optical pulses by compensating the chirp often found in such pulses.1 The GTI has been used to compress pulses from a variety of chirped mode-locked laser sources and has also been used intracavity to compensate for dispersion internal to the cavity of a mode-locked semiconductor laser.2

© 1990 Optical Society of America

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