In the last few years, several authors have reported low-threshold stimulated Brillouin scattering (SBS) and lasing using ultrahigh quality Q whispering-gallery-mode (WGM) optical resonators [1,2]. This simple technique appears as a very promising solution for applications in telecommunications or microwave photonics and opens up a new mean to develop compact narrow-linewidth lasers and ultralow phase noise microwave signal generators . So far, Brillouin lasing has been demonstrated in silica and calcium fluoride (CaF2) WGM resonators [1,2].
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