Abstract
β-Barium borate (β-BaB2O4, β-BBO) films were deposited on fused silica substrates by spin coating poly(vinyl pyrrolidone) (PVP)-modified metallo-organic solutions. Film thicknesses of more than 500 nm were obtained by a single spin-coating step followed by O2 plasma and thermal treatments. Crack formation was effectively suppressed by the introduction of PVP. Samples annealed at 650 °C exhibit high transparency over a wide wavelength range (1100 nm−210 nm) and have a preferred orientation corresponding to the (006) crystallographic direction. The increased thickness of the BBO films provided a >10-fold increase in the second harmonic generation (SHG) efficiency when compared to BBO layers fabricated without the addition of PVP and O2 treatment. The precursor gels are readily amenable to contact lithography leading to patterned β-BBO films.
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