Abstract
We have discovered interesting temperature anomalies of the second-harmonic generation (SHG) in novel LiKB4O7 single crystals. We have found that the maximal SHG signal exists at a temperature equal to about 230–240 K. The maximally achieved second-order susceptibility was equal to about 1.4 pm/V at a 1064-nm laser wavelength and was achieved at the sizes of crystallites of less than 80 nm. At sizes of about 1200 nm, the second-order optical properties are commensurable with the second-order susceptibilities of the bulk crystallites and are equal to about 0.6 pm/V. The observed size sensitivity of the effect may reflect the substantial role of the nanoconfined effects.
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