Hargrove-Fork-Pollack 1964 mode-locking: phase-coherent superposition of N longitudinal modes -> pulse train Delta_t = T_rt / N; sub-fs Ti:Sapphire (Spence-Sibbett-Sleat 1991).
Hargrove-Fork-Pollack 1964 mode-locking: phase-coherent superposition of N longitudinal modes -> pulse train Delta_t = T_rt / N; sub-fs Ti:Sapphire (Spence-Sibbett-Sleat 1991).