Laser Diode Fiber Optic Coupling

The laser has a beam diameter of 0 81 mm and divergence 1 0 mrad.

Laser diode fiber optic coupling.

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. Laser diodes are available with an fc st or sc receptacle or with core diameters of 3 200 µm for the fiber coupled versions. 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. 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.

A demonstration of how to couple a laser in free space into an optical fiber. Fiber coupling vs distance 0 5 10 15 20 25 1 51 7 1 92 1 2 32 5 distance mm fiber coupling fiber coupling fig 11. 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 typical coupling efficiencies for elliptical laser diode beam shapes is 40 for single mode and 80. 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. A demonstration of how to couple a laser in free space into an optical fiber. Fibers are field replaceable.

Fiber coupling vs distance the manufacturer of the laser diode mitsubishi specifies that the maximum fiber coupled power is 0 8mw 16 efficiency at a position of 1 9mm from the ball lens. Note that fiber coupling does always lead to a loss in optical output power. While all of toptica s diode lasers can be combined with toptica s versatile fiber launch. The fiber has a core diameter of 50 µm and an na of 0 20.

The rp photonics buyer s guide contains 74 suppliers for fiber coupled diode lasers. 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 end is either open or terminated with an optical connector both pc and apc polishing can be done. In fact for confocal micoscopy setups the coupling of a laser diode head into a polarization maintaining single mode fiber is nearly a must.

Our range of laser diodes with fiber connection and optical plugs is extensive. Different kinds of microlenses are fabricated on fiber tips in order to maximise laser to fiber coupling.