Beam-shaping design for multi-wavelength diode laser stack system coupled into optical fiber for biomedical applications

Multispectral diode laser sources are extensively used for a variety of applications involving the identification small objects based on their spectral signature. Although power scaling single emitters is severely limited, they easily stackable as bars and stacks, allowing combination wavelengths levels required each application. However, critical drawback given by this topology asymmetry between fast slow axes in beam profile, leading to poor quality possibly fiber coupling efficiency. In regard, suitable shaping maximize smallest possible core. work, we propose an innovative method homogenization six 8-bar stacks at from 790 nm 980 nm. We performed realistic simulations examine with, when possible, commercially available components. Fast-axis collimating (FAC) lenses twisters designed Zemax remodel far-field emitted bar. The stack halved vertical axis using polarization combiners, then three quartz-plate combine rearrange beams coming pair horizontal eliminate lightless regions. A multispectral obtained reflective dichroic mirrors effectively coupled into optical with core diameter 1 mm numerical aperture (N.A.) 0.5 doublet cylindrical lenses. maximum density ∼ 0.73 MW/cm 2 calculated output 89 %. number can benefit proposed topology, particular biomedical probes identified potential candidates implementation system.