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A Lithium Calcium Borate Nonlinear Optical Crystal with Deep-UV Cutoff Edge and Moderate Second-Harmonic Generation
Xianghao Kong1, Zherui Yu1, Ning Jia2,3
1State Key Laboratory of Crystal Materials, Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystals, Tianjin University of Technology Tianjin 300384, China.
Inorganic Chemistry
|May 18, 2026
Summary
Researchers developed a new deep-ultraviolet nonlinear optical crystal, LiCaB9O15 (LCBO), offering excellent performance for short-wave UV applications. This novel material exhibits a deep-UV cutoff and good optical properties.
Area of Science:
- Materials Science
- Crystallography
- Optics
Background:
- Designing deep-ultraviolet (DUV) nonlinear optical (NLO) crystals with balanced performance is challenging.
- Existing DUV NLO materials often lack optimal comprehensive properties.
Purpose of the Study:
- To report a new mixed alkali and alkaline-earth metal polyborate NLO crystal, LiCaB9O15 (LCBO).
- To investigate the structural and optical properties of LCBO for potential DUV NLO applications.
Main Methods:
- Spontaneous nucleation synthesis of LiCaB9O15.
- X-ray diffraction analysis to determine crystal structure (chiral orthorhombic space group P212121).
- Optical property measurements (UV cutoff, bandgap, second-harmonic generation (SHG), birefringence).
- First-principles calculations to understand optical characteristics.
Main Results:
- LCBO crystal synthesized with a deep-UV cutoff edge below 200 nm and a large bandgap of 5.7 eV.
- Observed moderate second-harmonic generation (SHG) response (0.8 × KDP) and birefringence (0.033 at 1064 nm).
- Unique 3D framework structure formed by spiral [B3O7] groups identified as key to optical properties.
Conclusions:
- LiCaB9O15 (LCBO) is a promising candidate for short-wave UV NLO applications.
- The study expands structural diversity in metal polyborate chemistry.
- The B-O sp hybrid orbitals in [B3O7] groups are crucial for LCBO's optical characteristics.
