Using an improved borosilicate glass with small third-order optical nonlinearities, i.e., nonlinear refractive index (NLRI)
and nonlinear absorption coefficient (NLAC), as the matrix and comparative glass, two types of Ho3+-doped glass are
prepared with a solid-phase smelting process at a relatively low temperature, and their third-order optical nonlinearities
are measured by the closed-aperture Z-scan technique using nanosecond laser pulses at 532nm wavelength. It is found
that the matrix glass possesses a positive third-order NLRI and a positive third-order NLAC, and both the third-order
NLRI and NLAC of Ho3+-doped glasses are one order larger than those of the matrix glass, respectively. Also, an open-aperture
Z-scan experiment and an optical limiting experiment further demonstrate that the Ho3+-doped glasses have a
high third-order NLAC. All the experimental results show that this Ho3+-doped glasses have good protection
performance for the 532nm-laser.
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