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.

Laser diode fiber optic coupling.

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. 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 fiber has a core diameter of 50 µm and an na of 0 20. 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 1 of 2 fiber coupled diode lasers have become commonplace since the telecom boom of the 1990s but many people still don t fully understand the intricacies of the fiber coupling process itself. Optical communication devices are an important foundation of the information industry. Let s consider coupling the light from a r 30990 hene laser into an f msd fiber. The laser has a beam diameter of 0 81 mm and divergence 1 0 mrad.

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