A single-mode GaAlAs laser is frequency stabilized by keeping the injection current and the voltage across the laser constant. A long-term frequency stability of 7 × 10−8 and a reproducibility of 3 × 10−7 were obtained.
Ludvigsen, H., Holmlund, C., Ikonen, E., Junttila, M-L., Ikonen, E., Junttila, M-L., & Ludvigsen, H. (1992). Frequency stabilization of a GaAlAs semiconductor laser by voltage control. Applied Optics, 31(18), 3384-3386. https://doi.org/10.1364/AO.31.003384