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The superradiant laser, based on the clock transition between the electricground state $^1$S$_0$ and the metastable state $^3$P$_0$ of fermionicalkaline-earth(-like) atoms, has been proposed to be a new promising lightsource with linewidth being the order of millihertz. However, due to the small$^1$S$_0$-to-$^3$P$_0$ transition strength, the steady-state power in thatsystem is relatively low ($\sim 10^{-12}$W). In this work, we propose analternative superradiant laser scheme based on a Raman-transition-inducedcoupling between the $^3$P$_0$ and $^3$P$_1$ states in bosonicalkaline-earth(-like) atoms, and achieve a laser with linewidth $\lesssim2\pi\times1$Hz and power $\gtrsim 10^{-10}$W ($\sim 10^{3}$ photons in steadystate) at a small pumping cost. The Raman beams play two significant roles inour scheme. First, the coherence between the dark and bright states induced bythe Raman beams produce a new local minimum in the pumping-linewidth curve withpumping rate lower than $2\pi \times 10$kHz, which is beneficial for continuousoutput. Second, the Raman beams mix the long-lived $^3$P$_0$ state into thelasing state and thus reduce the linewidth. Our work greatly improves theoutput performance of the superradiant laser system with coherence induced byRaman transitions and may offer a firm foundation for its practical use infuture.

Coherence-Assisted Superradiant Laser with Hz Linewidth and $10^{-10}$W Power