Thus, one can not only better understand the relationship between the microstructure and macroscopic properties of NLO materials, but also more effectively design new NLO materials.īased on this first-principles design system, LIN's group elaborated on the structural design strategies of novel NLO materials in the deep-UV and mid-IR regions, including the regulation of cations and the expansion of anionic groups to enhance the deep-UV NLO performance, and the construction of polar tetrahedral structure to enhance the mid-IR NLO properties. In response to the core issues of this field, they have developed a set of first-principles calculation and analysis tools in recent years to clarify the NLO mechanism.įurthermore, a NLO materials design system has been developed to accurately obtain NLO crystal structural parameters and key NLO properties including band gaps, second harmonic generation effects, birefringence and phase-matching wavelength. Recently, LIN Zheshuai's research group at Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences (TIPC, CAS) has systematically summarized their original contribution to the development of deep-UV and mid-IR NLO crystals. In order to accelerate the improvement of NLO performance, and to meet the needs of high-power lasers, the expansion of theoretical methods to clarify the structure-property relationship of NLO crystals in different spectral regions has become a key issue that must satisfy the requirements of wider-band applications. The famous "China Brand" crystals have met the requirement of laser technology in the ultraviolet (UV) and visible regions. CHEN Chuangtian has been widely applied in the ultraviolet (UV) spectral region today. In the 1980s and 1990s, the anionic group theory proposed by Prof. The development of NLO crystals largely determines the development of laser technology. Nonlinear optical (NLO) crystals are important fundamental materials for current and future optoelectronic technologies.
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