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We numerically investigated the characteristics of diode-end-pumped passively Q-switched solid-state Cr:LiSAF lasers. A Cr:YSO crystal is used as an intra-cavity saturable absorber. Our obtained results indicate the influences of resonator and pumping parameters on the characteristics of passively Q-switched solid-state Cr:LiSAF laser. Particularly, our numerical investigations are done in respect to the Cr:LiSAF laser medium of a very wide gain spectrum from 700 nm to 920 nm. Using a CW diode pumping at 670 nm and a Cr:LiSAF crystal of 3 mm long and 1 at.%, a stable generation of Q-switching nanosecond Cr:LiSAF laser pulse at 850 nm is obtainable with a pulse energy of about 2 mili-joule. Key word: Cr:LiSAF, Cr:YSO, passively Q-switch laser Nguyen Van Hao, Nguyen Dinh Hoang, Ngo Khoa Quang, Dao Duy Thang, Nguyen Dai Hung 28 caused by A2→T2 transitions, the laser emission spectrum is red-shifted to be peaked near 850 nm. The some of the important material properties of Cr:LiSAF and Cr:YSO parameters are listed in Table 1 and Table 2. Table 1. Material properties of Cr:LiSAF [5] Chemical formula Cr: LiSrAlF6 Crystal system rhombohedral, uniaxial Main absorption peaks 440 nm and 650 nm (peaked at ~830 nm) Emission spectrum 700 nm to 1100 nm Peak laser wavelength ~ 850 nm Peak emission cross-section ~ 4.8 × 10cm Fluorescence lifetime at 25oC ~ 67 μs Refractive index 1.41 Table 2. Material properties of Cr:YSO [14] Chemical formula Cr:Y2SiO5 Crystal system monoclinic, biaxial Lattice constants a = 10.41 Å, b = 6.72 Å, c = 12.49 Å, β = 102o39’ Cr atoms/mole % ~ 9.7 × 10/cm Refractive index 1.8 Main absorption peaks 390 nm, 595 nm, 695 nm, and 750 nm Emission spectrum 1000 nm to 1500 nm (peaked at ~1250 nm) Fluorescence lifetime at 25oC ~0.7 μs Density 4.6 g/cm

Characteristics of Diode End-Pumped Passively Q-Switched Solid-State Cr 3+:LiSAF Laser