Clarkson, W.A., Neilson, A.B. and Hanna, D.C.
Explanation of the mechanism for acousto-optically induced unidirectional operation of a ring laser
Optics Letters, 17, (8), . (doi:10.1364/OL.17.000601).
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A mechanism is proposed for the nonreciprocal behavior of a traveling-wave acousto-optic Q switch, whose use can provide an effective way to enforce unidirectional and hence single-frequency operation of a ring laser. Simple energy and momentum conservation considerations show that the Bragg condition is satisfied at different angles of incidence for the two counterpropagating beams, which leads to a difference in their diffraction losses. The loss difference, measured directly for a diode-pumped Nd:YAG ring laser, yielded values in close agreement with calculated values. Implications of these results for both single-frequency cw and Q-switched operation of diode-pumped solid-state ring lasers are discussed.
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