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A lithium-scandium sulfate with second-harmonic generation response and deep-ultraviolet transparency
Zi-Long Geng1,2, Hong-Xin Tang1, Rui-Biao Fu1
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China. furb@fjirsm.ac.cn.
Dalton Transactions (Cambridge, England : 2003)
|October 12, 2023
Summary
Researchers developed a new beryllium-free nonlinear optical crystal, Li(H2O)2Sc(SO4)2. This deep-UV transparent material exhibits a notable second-harmonic generation (SHG) response and a cutoff edge below 190 nm.
Area of Science:
- Materials Science
- Crystallography
- Optics
Background:
- Nonlinear optical (NLO) crystals are crucial for frequency conversion in lasers.
- Developing new NLO materials with deep-ultraviolet (deep-UV) transparency and improved performance is an ongoing challenge.
- Beryllium-containing compounds have historically been used but pose toxicity concerns.
Purpose of the Study:
- To synthesize and characterize a novel beryllium-free NLO crystal.
- To investigate the optical properties, including deep-UV transparency and second-harmonic generation (SHG) performance.
- To explore the crystal structure and its relation to NLO properties.
Main Methods:
- Single crystal X-ray diffraction for structural analysis.
- Optical spectroscopy (UV-Vis) to determine the transmission edge.
- Powder SHG measurements to evaluate nonlinear optical efficiency.
Main Results:
- A new layered crystal, Li(H2O)2Sc(SO4)2, was successfully synthesized.
- The crystal structure reveals a 2D framework of [Sc(SO4)2] decorated by [LiO2(H2O)2] groups.
- It exhibits a phase-matching SHG response of 0.7 × KDP and a deep-UV cutoff edge below 190 nm.
Conclusions:
- Li(H2O)2Sc(SO4)2 is a promising beryllium-free deep-UV transparent NLO material.
- Its unique layered structure contributes to its desirable optical properties.
- This discovery opens avenues for new NLO applications in the deep-UV spectral region.
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