Abstract

Monolithic multi-wavelength diode lasers are of great interest in application fields such as THz-generation or shifted excitation Raman difference spectroscopy. Combining the laser light of multiple laser resonators placed next to each other on the same chip is necessary to realize multi-wavelength laser emission from a common output aperture. This can be obtained by implementing bent waveguides, which launch the laser light into a Y- [1] or MMI-coupler [2]. However, bent waveguides can introduce additional waveguide losses, which potentially reduce the overall laser efficiency. Therefore, it is of great interest to determine the losses introduced by different bent waveguide designs.

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