![]() The last couple decades have seen a flurry of research activity around the control of spontaneous emission based on the principles first prescribed by E. Further implications, including an additional order-of-magnitude enhancement in effective coherence by way of control of the relaxation oscillation resonance frequency and enhancement of the intrinsic immunity to optical feedback, highlight the potential of the proposed concept for next-generation, integrated coherent systems. As a result, some two orders of magnitude reduction in quantum noise over the state of the art in semiconductor lasers, corresponding to a minimum linewidth of 1 k H z, is demonstrated. A method of leveraging and “walking” this fine balance to its limit is described. Central to the approach is the recognition of the intimate interplay between spontaneous emission and optical loss. Here, we demonstrate, theoretically and experimentally, the reduction of the quantum phase noise of a semiconductor laser through the direct control of the spontaneous emission into the laser mode, exercised via the precise and deterministic manipulation of the optical mode’s spatial field distribution. ![]() Such a level of access can be exploited for the control of the coherence and dynamic properties of the laser. ![]() ![]() Few laser systems allow access to the light–emitter interaction as versatile and direct as that afforded by semiconductor lasers.
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