Abstract
We demonstrate the third-order nonlinear optical properties of () and -switched lasers with as the saturable absorber for the first time to our knowledge. The third-order nonlinear properties, including the optical Kerr nonlinearity and saturable absorption, were systematically measured and analyzed in detail by using a Z-scan technique. The measured data show that has a large nonlinear refractive index, ground-state absorption cross section, and excited-state absorption cross section in contrast to (). With a Nd:YGG crystal as the gain medium and a crystal as the saturable absorber, the passively -switched laser was performed. The shortest pulse width and largest pulse energy were achieved at the absorbed pump power of 8 W with the values of 9.1 ns and 26.1 μJ, respectively, corresponding to the average output power of 0.87 W and peak power of 2.9 kW. The results indicate that is an available and promising optical switcher for pulsed lasers.
© 2015 Optical Society of America
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