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Self-mode-locking of optically pumped vertical-external-cavity surface-emitting lasers

Foto: AG Koch/AR-I
Working on the setup of a pulsed VECSEL

Our vertical-external-cavity surface-emitting lasers (VECSELs) are promising laser devices made of semiconductor structures. Nowadays, the pulsed operation is also achieved without using the common semiconductor saturable absorber mirror (SESAM). This novel technique is known as self-mode-locking (SML) and received great attention from the research community in this field in recent years. Yet, not a widely spread laser type, SML VECSELs are expected to be very useful for various applications, such as nonlinear microscopy and others, that require pulsed laser light.

Within our research, we want to improve the applicability of self-mode-locked operation and to improve the performance of our lasers.

We offer you project work related to the optimization of SML VECSELs. The task is to shorten the pulse duration by certain techniques and to increase the peak power of mode-locked VECSELs for applications.

What will you learn in our team: You will use sophisticated optoelectronic devices in order to characterize the VECSEL, and you will become acquainted with laser design aspects and analyzing tools. Your first practical experience in the field of laser research and development will equip you with insight and understanding regarding application-oriented work in the field of photonics.

Feel free to contact us: Dr. Arash Rahimi-Iman

Diagram: M. Gaafar