Laser squared: A two-domain photon-phonon laser

https://phys.org/news/2023-07-laser-squared-two-domain-photon-phonon.html

"low-frequency flexural acoustic wave using forward stimulated Brillouin scattering, interaction photons and phonons within 2-mode fiber... while phonon laser power confined inside cavity, Stokes optical laser output of coupler... threshold pump power photon laser 180 mW... forward intermodal stimulated Brillouin scatteringcoupled lasing 2 different physical domains within same cavity... optomechanics, multidomain lasers, optical and acoustic tweezers, mechanical sensing, generate microwaves, quantum processing"