![]() The recent development of two new-type NLO borate crystals, β-BaB 2O 4 and LiB 3O 5, is described. Suggestions are put forward for searching for and developing other promising new NLO materials in the borate series. On the basis of these structural criteria, we have been successful in developing some new high-quality NLO materials, including the LiB 3O 5 crystal as an excellent NLO material. As a result, the SHG effects will decrease in the order (2) The SHG coefficients can be adjusted to a certain extent by suitable arrangement of the three-and four-coordinated B atoms, such as (BO 3) 3- and (BO 4) 5-, (B 3O 6) 3- as opposed to(B 3O 7) 5- and (B 3O 8) 7-. A simple synthetic method was designed, in which the Sonogashira coupling reaction and 2+2 cycloaddition click reaction with high yield were performed on 1-bromopyrene to obtain several novel pyrene derivatives. Known UV NLO crystals mainly focus on crystals containing cations, but covalent crystals have rarely been reported. Moveover, in the planar group, the larger the electronic population in the conjugated 7c-orbital system, the greater the SHG effects will be. Nonlinear optical (NLO) crystals are the vital components of laser science and technology, as they can convert lasers in common wavelengths into new wavelength bands for ultraviolet (UV), IR, and even terahertz laser output. (1) The planar six-membered ring (B 3O 6) 3- and the planar trigonal (BO 3) 3 group, each possessing a conjugated 7t-orbital system, are far more favourable for producing larger SHG coefficients than the non-planar tetrahedral (BO 4) 5- group. have a distinct crystal structure, which is anisotropic with respect to. These structural criteria have good prospects of wider applications in searching and developing for other new types of NLO crystal materials. Nonlinear optical (NLO) materials play a major role in nonlinear optics and in. Through these calculations, a series of structural criteria serving as useful guidelines for searching and developing new NLO crystals in borate series are presented. On this basis, borate ions of various structure types are classified and systematic calculations are carried out for the NLO susceptibilities of some typical borate crystals with good prospects of applications in opto-electronics. ![]() Comparisions between these theoretical values and the experimental values made both on powdered crystals and on single crystals suffice to show the feasibility of the theoretical treatment and calculation methods. nonlinear optical signal processing, and quantum information technologies. Calculations have been made for the second harmonic generation (SHG) coefficients of a few typical NLO crystals. set of downloadable PowerPoint slides and glossary of terms for each chapter. The discovery of β-BaGa 4Se 7 can also provide new insights into the rational design of IR NLO crystals based on the predictable structural rearrangement.Starting from a general quantum-mechanical perturbation theory on the nonlinear optical (NLO) effect in crystals, this review gives a systematic presentation of the basic concepts and calculation methods of the ‘anionic group theory for the NLO effect of crystals’ and a brief discussion of the approximations involved. These indicate that β-BaGa 4Se 7 is a promising IR NLO crystal. More importantly, this material can exhibit exceedingly excellent NLO properties, including strong SHG response (5 × AgGaS 2), wide transmission range (0.44–20 μm) and high laser damage threshold (680 MW cm −2, 20 × AgGaS 2), as well as stable physicochemical properties. The stability and functional properties of the material were simulated by first-principles calculations, and eventually it was also successfully synthesized via a high-temperature solid-state reaction in a sealed silica tube. Phosphates as UV NLO crystals are limited in practical applications due to their weak second-harmonic generation (SHG) response. Herein, a high-performance IR NLO crystal, β-BaGa 4Se 7, has been successfully predicted and synthesized by the optimal rearrangement of the NLO-active basic structure units. Abstract Ultraviolet nonlinear optical (UV NLO) crystals are the key and basic materials for solid-state lasers. Balancing the key performance metrics, such as a large second harmonic generation (SHG) response and a wide band gap, is an extremely important but intractable challenge for the development of infrared (IR) nonlinear optical (NLO) materials. This is particularly true with the nonlinear optical (NLO) crystals, which can expand the spectral ranges of solid-state lasers from ultraviolet (UV) to infrared (IR) through a second harmonic generation (SHG) or optical parametric oscillation (OPO) process. ![]() Rationally designing new inorganic materials with specific functional properties is a fascinating challenge.
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