Laser Diode Fiber Optic Coupling

The used fibers and techniques differ very much for different diode lasers.

Laser diode fiber optic coupling.

Core diameter and numerical aperture we mentioned how the numerical aperture depends on the relationship between the index of the core and the cladding and that this directly relates to the angular. The fiber has a core diameter of 50 µm and an na of 0 20. An even more important restriction is that the angle from the lens to the fiber θ 2 must be less than the na of the optical fiber. Let s consider coupling the light from a r 30990 hene laser into an f msd fiber.

Laser processing of as cast nab with nominal composition cu 8 5al 5ni 4 5fe wt was carried out with a fiber coupled 3 5 kw laserline diode laser. The laser has a beam diameter of 0 81 mm and divergence 1 0 mrad. Many diode lasers are thus sold in fiber coupled form with robust fiber coupling optics e g a permanent laser welded fiber attachment built into the laser package. The beam was delivered via a 1 mm diameter optic fiber terminated with a 200 mm collimating and focussing optic attached to a motoman up20 robot see figure 20 5a.

Fiber coupling part 2 of 2 in the last blog post of our laser diode fundamentals series we discussed the basics of fiber optics concentrating on two key parameters. Optical communication devices are an important foundation of the information industry.