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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.59: Poster

Mittwoch, 3. April 2019, 17:30–20:00, Poster E

Towards mode locking with a membrane saturable absorber mirror — •Ana Ćutuk, Roman Bek, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart

  Although providing several superior laser properties,  the vertical external-cavity surface-emitting laser (VECSEL) is limited to a certain range of laser wavelengths. An improvement can be made by removing the Bragg reflector and sandwiching the active region between heat spreaders and using another external dielectric mirror in the cavity instead. This membrane external-cavity surface-emitting laser (MECSEL) now allows for an extension of laser wavelengths and therefore new applications. A similar procedure can also be transferred to semiconductor saturable absorber mirrors (SESAMs) for mode-locked laser operation in order to extend the application range even further.

We present the concept of a membrane saturable absorber mirror (MESAM). Instead of a semiconductor DBR, a simple dielectric mirror is used as a cavity end mirror. The absorber active region containing two GaInP quantum wells is wet-chemically released from the substrate and then bonded onto the dielectric mirror in order to simulate a SESAM device. The MESAM is employed in a v-shaped VECSEL cavity to achieve pulsed laser emission in the red spectral range. Current investigations focus on achieving stable mode-locked operation and on the characterization of the MESAM nonlinear reflectivity.