The BaMgF 4 single crystal is grown by Bridgman method. The third-order nonlinear refractive indices along three crystallographic axes are determined by Z-scan technique with femtosecond laser. The largest one that has a value of 2.35ϫ 10 −18 m 2 / W is along the c-axis and the corresponding third-order nonlinear susceptibility is 1.24ϫ 10 −12 esu. This value is compared with LiNbO 3 through self-phase modulation effect. Furthermore, the mechanism and the possible applications of the relatively large third-order nonlinear refractive indices are also discussed at last.
The nonlinear refraction and nonlinear absorption phenomena are investigated in BaMgF(4) single crystal using the Z-scan technique in the ultraviolet region with a pulsed laser at 400 nm with 1 ps pulse duration. The remarkable nonlinear absorption behavior is identified to be three-photon absorption under the experimental conditions. In addition, both nonlinear refraction and nonlinear absorption have relatively large values and possess small anisotropy along three different crystallographic axes. The large values of nonlinear refractive index are demonstrated through the self-phase modulation effect.
The three independent second-order nonlinear optical coefficients of BaMgF 4 are determined by the Maker fringe method with a nanosecond pulsed Nd:YAG laser at 1064 nm wavelength. All the results are relative to the reference crystal congruent LiNbO 3. The largest element in a second-order nonlinear optical matrix of BaMgF 4 is d 32 , with the value of 0.36 pm∕V.
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