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Laser Sources differ from traditional illumination sources because they produce coherent light. The illumination spectrum is often narrow band with line widths as narrow as tens of megahertz and divergence as low as fractions of milliradians. Lasers are either utilized in free space, steered with traditional optics, or the source is coupled into a fiber. In a fiber coupled orientation, the emitting fiber tip is mounted at the location of beam delivery, reducing the need for steering optics. When a laser is fiber coupled, a cone of light is produced instead of a collimated beam.
Polarization refers to the direction with which the electric field of light waves oscillate, which is perpendicular to the direction of propagation. Light waves can be linearly, circularly, elliptically, or randomly polarized. For more information about polarization read Introduction to Polarization.
Laser sources may be polarized due to anisotropy (a material property that is different in different directions) in the laser gain material, directionally dependent polarization losses in the laser resonator, or the use of birefringent optical materials. Some laser sources are unpolarized (e.g. fiber lasers). The polarization state of a laser can also be used to reduce unwanted and potentially dangerous reflection from high-power sources as some materials reflect or absorb light in certain polarizations states over others.
Many laser applications including some interferometry, optical amplification and modulation, nonlinear frequency conversion, and incoherent and coherent polarization beam combining (polarization coupling), depend on the state of polarization in order to function.
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