LiSr3Be3B3O9F4: a new ultraviolet nonlinear optical crystal for fourth-harmonic generation of Nd:YAG lasers
A new ultraviolet nonlinear optical crystal, LiSr3Be3B3O9F4 (LSBBF), was obtained by the flux method. LSBBF is isostructural to NaSr3Be3B3O9F4 and inherits its brilliant [Be3B3O12F]10− structural units. It exhibits a considerable second-harmonic generation (SHG) intensity (∼2.2 × KDP) and short ultraviolet cut-off wavelength (∼175 nm). Further theoretical calculations revealed that the shortest SHG phase-matching wavelength of LSBBF is down to ∼245 nm. These results indicated that LSBBF has potential to be used for the 266 nm output of the fourth harmonic of Nd:YAG lasers.