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In this Thesis we investigate a new operating regime in a longitudinal multimode laser (MML) cavity for achieving phase-diffusion quantum random number generation(PD-QRNG). The scheme is based on intermode beating patterns, which are actively randomized under gain switching conditions. Despite the complexity of their relationship, the phases and beating can be theoretically calculated and predictions are confirmed experimentally. We have developed a prototype of a dual-mode fiber laser system, confirming that the proposed design is suitable for stable MML-PD-QRNG.
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