Functional crystal materials can achieve energy conversion because of their unique physical characteristics. With developments in science and technology, functional crystal materials have become important in many fields. For instance, potassium dihydrogen phosphate (KH
2PO
4, KDP) single crystal is a multifunctional material that possesses excellent nonlinear optical characteristics, effective photoelastic coefficients, and acousto-optic figures. KDP crystal is the first choice for multi-dimensional acousto-optical device [
1,
2] and currently the only material suitable for laser frequency conversion and electro-optic switch applications in high-power laser systems [
3]. Mercury cadmium telluride (HgCdTe, MCT) single crystal is the most significant material for infrared optoelectronic devices and MCT-based high performance infrared devices, and is widely used in the fields of aeronautics and astronautics [
4]. Cadmium zinc telluride (CdZnTe, CZT) single crystal is the most promising material for the fabrication of room temperature radiation detectors [
5,
6] and is also widely used as the perfect substrates for growing epitaxial layers of MCT crystal [
7]. CaF
2 single crystal is extensively applied in deep ultraviolet photolithography, solid-state lasers, and high-energy radiation detection [
8]. BaF
2 single crystal with high transparency for infrared and visible light is often used in CO
2 laser hatch and infrared optical systems [
9]. Ammonium dihydrogen phosphate (NH
4H
2PO
4, ADP) single crystals whose crystal structure is similar to KDP also possess excellent nonlinear optical characteristics [
10].