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We have numerically investigated, for the first time, the optical performance and characteristics of diodeend-pumped passively Cr4+:YSO Q-switched solid-state Cr3+:LiSAF lasers using a rate equation system extended to multi-wavelength. Homogeneously broadened emission spectra of the laser crystal and broad absorption spectra of Cr4+:YSO saturable absorber have been respected in the investigation. A tunable passively Q-switched laser operation is also developed with a birefringent filter plate used as an intracavity selective element. As a result, improved understanding of passively Q-switched Cr4+:YSO solid-state Cr3+:LiSAF lasers has been obtained in broadband and tunable laser operations. Characteristics of the tunable passively Q-switched Cr3+:LiSAF laser were demonstrated to be clearly dependent on wavelength. The spectro-temporal evolution of a single pulse emitted from the passively Q-switched Cr3+:LiSAF laser has been reported.

Numerical Investigations of Laser Diode End-pumped Solid-state Cr\(^{3+}\):LiSAF Lasers Passively Q-switched with Cr\(^{4+}\):YSO Crystal