When a gain medium applies a strong Laser beam, the gain is saturated, i.e., reduced to some extent. Under certain circumstances, the Saturation can be inhomogenous, meaning it can be stronger around the Wavelength of the Laser Beam than at other wavelengths. Inhomogenous saturation can arise when different laser ions in the gain medium can occupy different lattice sites (assuming a solid-state medium); commonly occurs in glasses. Inhomogenous saturation in a laser can influence the optical Spectrum of the laser output and restrict wavelength tuning range.
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