Passive Q-switching of a Tm:YLF laser with a Co2+ doped silver halide saturable absorber Academic Article uri icon

abstract

  • We report a successful passive Q-switching of a Tm:YLF laser operating at λ = 1.9 μm, using a Co 2+ :AgCl 0.5 Br 0.5 saturable absorber. Approximately 200-ns long, 150 μJ pulses were obtained. Increase in pump energy resulted in repetitive pulsing, with a repetition rate approximately proportional to the pump pulse energy. Room-temperature optical transmission saturation curves measured in ∼1-mm thick Co 2+ :AgCl 0.5 Br 0.5 plates yielded a ground state absorption cross section σ g s = ( 7.8 ± 0.5 ) × 10 − 18 c m 2 , and an excited state absorption cross section σ e s = ( 3.3 ± 0.3 ) × 10 − 18 c m 2 , at λ = 1.9 μm. The lifetime of the A 2 ( 4 F) second excited-state of the octahedral O symmetry was τ ∗ = ( 0.6 ± 0.06 ) n s .

publication date

  • January 1, 2017