The rapid development of deep-UV (DUV) all-solid-state laser sources greatly depends on the nonlinear optical (NLO) crystals with good performances. In this work, from the point of view of the structure-property relationship we comprehensively investigate the developing spaces of the NLO borates that are the sole NLO crystals used to produce harmonic generation in the UV and DUV spectral regions. The microscopic structural units, energy band gaps, linear and nonlinear optical properties of numerous borate compounds with diverse structural features are compared and summarized. The results clearly demonstrate that the KBe₂BO₃F₂ (KBBF) crystal almost achieves the theoretical limits of DUV NLO borates. It is anticipated that any other borate that can match KBBF would be hardly discovered for producing the coherent light output below the wavelength of 190nm only with Second Harmonic Generation (SHG) method. The future prospect of exploring new DUV NLO borates is not optimistic.

1. PRESENTATION: Explorations of deep-ultraviolet nonlinear optical borates: approaching to the end, Zip archive data, at least v2.0 to extract, 0MB

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