In this paper, the KBe₂BO₃F₂(KBBF) crystal has been demonstrated to be a super nonlinear optical crystal. Firstly, KBBF has excellent nonlinear optical properties including a widest phase-matching wavelength region, a widest temperature bandwidth and highest damage threshold in all nonlinear optical crystals. Secondly it has superior capability to produce deep-UV second harmonic generation. For example, it can produce 153nm with 0.5mW output power, 120mW 177.3nm as well as 191nm cw laser at mW level. Finally, some important applications are introduced especially in the advanced deep-UV laser angle- and spin- resolved photoemission spectrometers and deep-UV laser photon-electronic emission microscope et. al.

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