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We propose a solid-state based superradiance laser which is almostinsensitive to the cavity mirror vibration. Therefore, it can compete with thebest frequency-stable local oscillators. The long coherence time and the largeoptical density of rare-earth-ions (REIs) doped solids are employed to find aregime to demonstrate a steady-state laser emission with linewidth smaller thanthe atomic decay rate. The experimental parameters are discussed andintracavity photon number and laser linewidth are calculated based on themean-field theory. A procedure for measuring absolute laser linewidth isproposed.

A naturally trapped rare-earth doped solid-state superradiant laser clock