Nonfeedback control of chaos in a microchip solid-state laser by internal frequency resonance

Stabilization of a chaotic laser mode to high-period orbits is experimentally and numerically accomplished in a Nd:YVO₄ microchip solid-state laser subject to frequency-shifted optical feedback by applying a pump modulation at well defined conditions. Various periodic orbits, which do not exist in the original chaotic attractor, can be extracted from one chaotic oscillation by varying the pump modulation parameters. Characteristics of the periodic temporal wave form generation can be interpreted by internal frequency resonance among the relaxation oscillation frequencies, the Doppler-shifted frequency of optical feedback, and the pump modulation frequency.