778.1 nm distributed feedback lasers for Rb two-photon atomic systems with sub-4 kHz linewidths
APL Photonics
9,
056114
(2024)
A new epitaxial layer design with a double mode expander layer, high refractive index claddings, and an aluminum-free active area has …
E. Di Gaetano, B. Keliehor, K. Gallacher, P. F. Griffin, M. Sorel, E. Riis, D. J. Paul