The buildup dynamics of a homogeneously broadened continuous-wave Ti:sapphire laser is experimentally investigated for the first time to our knowledge. The average output power of the laser exhibits relaxation oscillation behavior initially and approaches the steady-state value in ≈20 µs. Concurrently, the longitudinal-mode spectrum evolves from a multicluster spectral distribution (tentatively attributed to the spectral windowing effect of the Brewster-angle-cut Ti:sapphire crystal as a birefringent filter) to a single cluster at 787.5 nm. The spectral narrowing (which is due to gain competition in the homogeneously broadened medium), however, takes ≈500 µs. Physical mechanisms that explain qualitatively the two distinctive time scales are presented.
© 1992 Optical Society of America
Ci-Ling Pan, Jahn-Chung Kuo, Chin-Der Hwang, Jia-Min Shieh, Y. Lai, C.-S. Chang, and Kaung-Hsiung Wu, "Buildup dynamics of the spectrum and the average output power of a homogeneously broadened continuous-wave Ti:sapphire laser," Opt. Lett. 17, 994-996 (1992)