The ground-state and excited-state absorption cross sections of a Cr5+:YVO4 single crystal were determined by the intensity-dependant transmission measurements to be(2.0±0.4)×10-18 cm2 and less than 0.1×10-18 cm2 at 1.08 μm, respectively. The bleaching relaxation time of the Cr5+:YVO4 crystal was estimated to be 3.5±1.5 ns. Passive Q-switching of a diode-pumped Yb3+:YVO4 laser with the Cr5+:YVO4 saturable absorber was realized.
Zolotovskaya, S., Yumashev, K. V., Kuleshov, N. V., Matrosov, V. N., Matrosova, T. A., & Kupchenko, M. I. (2006). Absorption saturation properties and laser Q-switch performance of Cr5+-doped YVO4 crystal. Applied Physics B: Lasers and Optics, 86(4), 667 - 671. https://doi.org/10.1007/s00340-006-2521-6