Abstract
This chapter introduces a class of deep-UV (DUV) nonlinear optical (NLO) crystals, the fluoride-based beryllium borates MBe2BO3F2 (M=K, Rb, Cs), especially KBe2BO3F2 (KBBF), beginning with how KBBF was selected as a potential DUV NLO crystal in the 1990s. The relationship between its microscopic structure and macroscopic optical properties is discussed. Its crystal growth, optical properties, capability to produce DUV lasers, and applications are described. DUV lasers based on KBBF crystal devices have been successfully used in several advanced scientific instruments, such as high-resolution photoemission spectrometers. Additionally, two related compounds, RbBe2BO3F2 and CsBe2BO3F2 are also introduced. The crystals' growth and optical properties are reviewed separately.
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