Low numerical aperture fiber output diode laser module

A low numerical aperture fiber output diode laser module, comprising:

• a case, the case including a base and a cover, wherein the base is provided with a concave part, the concave part having a mesa;
• multiple laser diodes arranged substantially in parallel inside the mesa for emitting light beams extending across the case, wherein each laser diode of said multiple laser diodes includes a laser chip configured with a resonant cavity having an end face, wherein the end face of the resonant cavity forms a specular surface electroplated with a reflective film, and wherein reflectance of the reflective file is ≥20%;
• an optic fiber, the optic fiber having a core optical fiber, wherein the output of the optic fiber is configured with a low numerical aperture, and wherein the optic fiber extends from a lateral side of the case substantially in perpendicular to the light beams;
• and
• an optical lens module arranged inside the concave part of the case, wherein the optical lens module includes multiple fast axis collimating lenses, multiple slow axis collimating lenses and multiple reflecting mirrors, wherein the light beams emitted by the laser diodes are collimated by each of the fast axis collimating lenses and each of the slow axis collimating lenses, and wherein the light beams collimated by the fast and slow axis collimating lenses travel through each of the reflecting mirrors for converging into a convergent light beam traveling in perpendicular to the light beams in a space of the low numerical aperture fiber output diode laser module, and wherein the convergent light beam is coupled with the core optical fiber and directed via a focusing lens to the low numerical aperture, and wherein each of the fast-axis collimating lenses is arranged on the mesa in proximity to a front of each of the laser diodes, wherein each of the slow-axis collimating lenses and each of the reflecting lenses are arranged in the concave part of the base, and each of the slow-axis collimating lenses is arranged in alignment with a respective one of the fast-axis collimating lenses, wherein each of the reflecting lenses is arranged in from of a respective one of the slow-axis collimating lenses, wherein the focusing lens is arranged at a lateral side of the reflecting lenses and is positioned at the lateral side of the concave part of the base, wherein the position of the focusing lens corresponds to the position of the core optical fiber.