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Characterization of nonlinear lensing effects in semiconductor disk lasers

A pulsed light from semiconductor disk lasers (SDLs) can be commonly achieved with a semiconductor saturable absorber mirror (SESAM). Alternatively, a novel technique known as self-mode-locking (SML) enables the pulsed operation of such lasers without SESAMs. In such a device, pulsing is understood to arise from a nonlinear-lens effect in the chip structure. Yet, not a widely spread laser type, SML SDLs 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 our understanding of the self-mode-locked operation and of the effects involved in the stable pulsing of our lasers.

We offer you project work related to the characterization of the nonlinear-lens effect in the laser chip. The task is to perform z-scan measurements and to identify a power-dependent refractive index change in the chip. The nonlinear effect will be probed by optical experiments including ultrafast spectroscopy methods.

What will you learn in our team: You will use sophisticated optoelectronic devices in order to characterize the SDLs, and you will become acquainted with spectroscopic methods and analyzing tools. Your first practical experience in the field of laser research and development will equip you with insight and understanding regarding fundamental science in the field of photonics.

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