The major suppliers for 915/976 nm single mode pump laser diodes are companies which developed their businesses at the end of the nineties for fiber amplifiers used in the Telecom market (EDFAs: Erbium Doped Fiber Amplifiers). They are used to pump single clad active fibers (see Figure 4). These fiber coupled laser diodes are generally able to reach between 300 mW and 1.5 W of output power. This type of laser diode is generally assembled in a butterfly package with a TEC cooler integrated into the package (the trend today being towards smaller form factors). They can be separated into two major families:ġ- Single mode fiber coupled laser diodes where the light coming from a small edge-emitting laser diode is focused into a ~6 µm fiber core. Pump laser diodes that are used for fiber lasers are fiber coupled device generally based on AlGaAs III-V semiconductor technology emitting in the 800-1000 nm range (most often 915 or 976 nm – see absorption spectrum Figure 3).
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