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Fiber coupled laser diodes: this tutorial provides an overview of the technical properties of fiber-coupled laser diodes. The various laser diode families such as DFB laser diodes or multi-emitter high power laser diodes will be described in this tutorial. Laser diodes are everywhere today.
Pump laser diodes that are used for fiber lasers are fiber coupled device generally based on AlGaAs III-V semiconductor technology emitting in the 1000800-nm range (most often 915 or 976nm – see absorption spectrum Figure 3).
QPC Lasers products range from sub-watt single-mode PM fiber coupled diodes for LIDAR and communications to multi-mode fiber-coupled modules with outputs in the hundreds of watts for medical, materials processing and pumping applications.
Goal: learn how to couple a laser beam from free-space into a singlemode optical fiber. • Choose the right lens: need to match the NA and spot size to the core size of the fiber. • Perform alignment: can take a long time if you use bruce-force. Can be done very quickly with some “tricks”.
This tutorial describes the technical properties of several families of fiber-coupled laser diode like DFB laser diodes or multi-emitter fiber coupled laser diodes.
The diagram below shows a schematic example of how the core of the fiber should be aligned to the laser diodes active area. Butt coupling is the simplest method of laser diode fiber coupling, but also the least efficient because no effort is made to match the fiber’s numerical aperture.
Lumentum L4-series diode lasers offer up to 10 W of power from a 105 μm fiber. The L4 is a revolutionary platform based on a long history of existing fiber-coupled L2 and L3 packages, incorporating a highly reliable design into a scalable commercial product.
