Abstract
A new noncentrosymmetric cadmium indium borate, Cd4InO(BO3)3 (CIBO) has been successfully developed via a standard solid-state reaction. Its crystal structure was confirmed by the single crystal X-ray diffraction, which shows that CIBO belongs to the non-centrosymmetric and polar space group Cm. Its structure contains the distorted InO6 and CdOn (n = 6, 8) polyhedra, which link together by sharing an edge or corner to build a three dimensions framework with BO3 triangles accommodated in tunnels. Benefiting from the approximately parallel configuration of BO3 triangles, CIBO exhibited a strong second harmonic generation (SHG) effect (3 × KDP), and moderate birefringence of 0.077@1064 nm. Further optical and thermal characterizations suggest that CIBO possesses a wide transparent window and good thermal stability. Theoretical calculation reveals that the macroscopic SHG coefficients of CIBO results from the synergistic effect of the parallel arrangement of BO3 groups and d10 Cd2+ cation.
Highlights
Nonlinear optical (NLO) crystals that can expand the wavelength of a solid-state laser by second-harmonic generation (SHG) have been applied at the forefront of scientific and technological research, such as medicine, scientific research, civil industries, etc. [1,2,3,4]
CIBO exhibits a large SHG response about three times that of KDP and a moderate birefringence of 0.077@1064 nm, which mainly originated from the well arrangement and high density of BO3 groups, as well as the d10 Cd2+ cation
The IR and UV−Vis−IR diffuse reflectance spectra indicated that CIBO possess BO3 groups and a wide transparent region, respectively
Summary
Nonlinear optical (NLO) crystals that can expand the wavelength of a solid-state laser by second-harmonic generation (SHG) have been applied at the forefront of scientific and technological research, such as medicine, scientific research, civil industries, etc. [1,2,3,4]. Nonlinear optical (NLO) crystals that can expand the wavelength of a solid-state laser by second-harmonic generation (SHG) have been applied at the forefront of scientific and technological research, such as medicine, scientific research, civil industries, etc. Only non-centrosymmetric (NCS) crystalline materials can exhibit the SHG response [5,6]. As for the properties, NLO crystals need to possess a large SHG response and moderate birefringence, which are essential to realize phase-matching (PM) in the desired wavelength range and obtain high laser conversion efficiency [7,8,9]. Exploring new NLO materials with a large SHG response and moderate birefringence were of enormous current academic and commercial interest
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