Laser Diode Fiber Optic Coupling

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.

Laser diode fiber optic coupling.

The fiber has a core diameter of 50 µm and an na of 0 20. 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. Optical communication devices are an important foundation of the information industry. 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. 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 laser has a beam diameter of 0 81 mm and divergence 1 0 mrad. 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.

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