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In page Optical amplifier:

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Solid-state amplifiers are optical amplifiers that use a wide range of doped solid-state materials (Nd: Yb:YAG, Ti:Sa) and different geometries (disk, slab, rod) to amplify optical signals. The variety of materials allows the amplification of different wavelengths, while the shape of the medium can distinguish between those more suitable for energy or average power scaling.[1] Beside their use in fundamental research from gravitational wave detection[2] to high energy physics at the National Ignition Facility they can also be found in many of today's ultra short pulsed lasers.[citation needed]