""

doi.org/10.1063/1.1646748
Appl. Phys. Lett.
Photonic Materials

Polman, A., Min, B., Kalkman, J., Kippenberg, T., & Vahala, K. J. (2004). Ultralow-threshold erbium-implanted toroidal microlaser on silicon. Appl. Phys. Lett., 84, 1037–1039. doi:10.1063/1.1646748