  Lasers that operate in the visible wavelength range and can be easily
integrated on a chip together with photonic integrated circuits are of
particular interest for biophotonic applications. We present a new class of
laser sources that emit at 600 nm wavelength and can be efficiently integrated
on the $\mathrm{Si}_3\mathrm{N}_4$ platform using low-cost fabrication
techniques. The $\mathrm{Si}_3\mathrm{N}_4$-organic hybrid lasers are optically
pumped from top without the need of a precise alignment. We investigate
different laser geometries based on spiral shaped ring resonators and
distributed feedback resonators. We discuss the laser properties with a focus
on their application in the field of bioscience.
