Redetermination of the second-order nonlinear optical coefficients of BaMgF4
BaMgF4 (BMF) has the potential to serve as a platform material for vacuum-ultraviolet (VUV) nonlinear optics owing to its ferroelectricity and high UV transparency down to 130 nm. However, the second-order nonlinear optical coefficients reported for BMF span approximately one order of magnitude, hindering a reliable assessment of its potential for nonlinear optical applications. Here, we redetermined these coefficients by combining Maker fringe, wedge, and single-pass second-harmonic-generation measurements at a fundamental wavelength of 1064 nm. Our results establish that all the second-order nonlinear optical coefficients of BMF lie in the range of 0.01-0.04 pm/V. We determined d31 to be 0.035 pm/V, which is among the largest coefficients of BMF, while it has been underestimated relative to the other coefficients in previous studies. Although d31 is not the largest coefficient, the use of its long corresponding coherence length is beneficial for quasi-phase matching, particularly for VUV generation, where the fabrication of lower-order quasi-phase-matching structures is crucial.