We experimentally prove that a Cr 4+ -doped Y 3 Al 5 O 12 (YAG) crystal exhibits saturable absorption in visible wavelengths at 639, 607, and 521 nm. From z -scan measurements, the saturation energies measured using laser pulse widths of 25 and 66 ns at 639 nm are estimated to ∼11.5 and 21.2 mJ/cm 2 , respectively. Therefore, the absorption response time will be shorter than these pulse widths. Using the Cr 4+ :YAG saturable absorber, we demonstrate for the first time, to the best of our knowledge, the passive Q-switched and the Q-switched mode-lock Pr 3+ -doped LiYF 4 (YLF) lasers at 639 nm pumped by an InGaN diode laser.
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Abe et al. (2013) studied this question.
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