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A novel method for modulating frequency-doubled blue radiation from an AlGaAs laser diode was developed utilizing the electro-optic effect in a KNbO3 nonlinear crystal. Stable blue radiation was obtained from an external ring resonant cavity containing a KNbO3 crystal. The weakly excited counterpropagating mode in the resonant cavity was re-injected into the laser diode to establish self-locking. Nearly 100% intensity modulation was observed when a 3 kV/cm ac electric field was applied parallel to the c axis of the KNbO3 crystal.
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Senoh et al. (1992) studied this question.
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