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Steady-state bistable lasing and hysteretic mode hops of two adjacent longitudinal modes are measured in a homogeneously broadened cw laser system: a cw rotational Raman laser in H2. As the pump laser’s frequency is cyclically tuned, the mode hops between two adjacent longitudinal Stokes modes show hysteresis. Theoretical modeling of the hysteresis effect indicates that the gain of the subthreshold Stokes mode is suppressed by a Raman-assisted multiwave mixing process. The theoretical calculation agrees well with the experimental measurement.
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Meng et al. (2004) studied this question.
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