Solid-state phonon lasers are crucial quantum transducers that can couple to versatile quantum systems and yet suffer from short-lifetime states due to the noisy environment. Here, we show a scheme to realize dissipation-robust surface-acoustic-wave (SAW) phonon lasing within strain-susceptible silicon-vacancy ($\mathrm{Si}$-$V$) center in diamond. The robustness is achieved by coupling the $\mathrm{Si}$-$V$ qubit to the SAW-phonon mode through transitions in a harmonic ladder of optically prepared long-lived dark states. Moreover, due to the interplay between the SAW-phonon spin and the $\mathrm{Si}$-$V$-qubit spin, as well as the spin-momentum locking of the SAW, we show the phonon-spin-selected unidirectional lasing of coherent SAW phonons. Our results provide an efficient path for the robust solid-state SAW-phonon laser and pave the way toward phonon-spin-mediated hybrid quantum systems.

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• Acoustic wave phenomena
• Color centers
• Lasers
• Quantum interference effects
• Spin-phonon coupling
• Transducers
• Coherent control
• Surface acoustic wave