Dissipative coupling-induced magnon-polariton lasing and amplification

The study of dissipative coupling has recently attracted considerable attention due to its ability to enable inimitable functions in light-matter interaction systems. Here we investigate the magnon-polariton lasing and amplification in a dissipatively coupled cavity magnonic system, where the cavity mode and magnon mode are coupled through a common dissipative channel (i.e., an open waveguide). Conventionally, dissipative coupling was achievable in the weak regime with system cooperativity less than one. By compensating the loss of the cavity mode, we substantially reduce its linewidth, facilitating the achievement of strong dissipative coupling regime. Also, our experimental results elucidate a clear pathway to implement the dissipative coupling-induced magnon-polariton lasing with two passive modes. When compared to other systems, the magnon mode offers the advantage of being highly flexible and tunable. By adjusting the magnon mode frequency and cavity linewidth compensation rate, we exhibit precise control over the laser output, enabling amplification of specific modes within certain frequency ranges. Our study offers a practical implementation of tunable magnon-polariton lasers and establishes a platform for advancing the field of gain-driven non-Hermitian cavity magnonics.