A tunable, single-frequency, solid-state ring laser includes a solid-state laser material (1) pumped by laser-diode light (5) and at least one additional external piece (2) which reflects the intra-cavity lasing light in a closed loop such that the plane of polarization is changed in an appropriate amount to compensate for magneto-optic change (Faraday rotation) of the plane of polarization, which occurs either inside the solid-state material or in one of the external pieces which traversed by the intra-cavity lasing beam. At least one of the external elements has the ability to change the optical path length of the intra-cavity lasing beam in order to tune the laser frequency by means of mechanical movement, electro-optic properties, magneto-optic properties, or some combination of the above properties.
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