Laser Diode Fiber Optic Coupling

Laser diode to fiber couplers are available in different diameters.

Laser diode fiber optic coupling.

Fiber optics are widely used in laser technology because of their ability to trap light and guide it from one location to another without experiencing. Our range of laser diodes with fiber connection and optical plugs is extensive. The output fiber can be terminated with different output connectors as desired. The pigtail style laser diode to fiber coupler provides higher coupling efficiencies and lower backreflection levels than receptacle style couplers as well as better stability.

The fiber has a core diameter of 50 µm and an na of 0 20. In fact for confocal micoscopy setups the coupling of a laser diode head into a polarization maintaining single mode fiber is nearly a must. This coupling is critical in all three axes x y and z. In this case the focus is behind the surface of the fiber so much of the beam energy is being coupled.

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. 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. Let s consider coupling the light from a r 30990 hene laser into an f msd fiber. The typical coupling efficiencies for elliptical laser diode beam shapes is 40 for single mode and 80.

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. Approaches differ for coupling edge and surface emitting leds into optical fiber and the lagrange invariant plays an important role in designing fiber coupling optics. The focused spot of the laser diode was then coupled into an optical fiber. The fiber end is either open or terminated with an optical connector both pc and apc polishing can be done.

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. Note that fiber coupling does always lead to a loss in optical output power. Laser diodes are available with an fc st or sc receptacle or with core diameters of 3 200 µm for the fiber coupled versions.

The used fibers and techniques differ very much for different diode lasers. 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. The laser has a beam diameter of 0 81 mm and divergence 1 0 mrad.