When forced to operate as unidirectional devices, many solid-state ring lasers can yield a reliable single mode output. Unidirectional operation is possible only if a sufficiently large loss-difference exists between the two counter- propagating beams. This is generally achieved by incorporating a Faraday isolator in the ring cavity. In order to minimize cavity losses, in low gain diode-pumped solid-state lasers, it is convenient to make use of the small Faraday effect which occurs in the laser medium itself.1

© 1991 Optical Society of America

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