Third-order Nonlinear Optical Properties Of CuMoO₄-ZnMoO₄ Composites

Nonlinear optics focuses on the interaction between laser and matter.Laser technology is constantly developing in innovation,which makes the research of nonlinear optical（NLO）more and more perfect.The research on NLO materials has also attracted more and more attention of scientists.The development and research of materials with stronger NLO effects are of great value to the development and application of a series of optoelectronic devices such as laser,optical modulators and all-optical switches.Metal molybdate（MMo O₄）is a very common salt,and exhibit several natural molybdate crystals in natural world.In addition,Chinese molybdenum mineral resources are very rich.Based on this powerful advantage,the development and utilization of MMo O₄ materials with excellent properties become more important and meaningful.In this paper,we research the third-order NLO properties of CuMoO₄ nanomaterial and CuMoO₄-Zn Mo O₄ composite material.In this thesis,CuMoO₄ nanomaterial was synthesized by a simple,safe and effective ultrasound method.The samples were characterized by scanning electron microscope,X-ray diffraction,Raman spectra.The results indicate that the average thickness of CuMoO₄nanomaterial is about 30 nm,and the structure is irregular flower shape with smooth surface.The X-ray diffraction and Raman spectra proved that CuMoO₄ nanomaterial was successfully synthesized.Then,the CuMoO₄-Zn Mo O₄ composite material was synthesized by a hydrothermal method,in which the CuMoO₄ was used as the precursor.The CuMoO₄-Zn Mo O₄composite material was characterized by the above methods.The results exhibit that Zn Mo O₄nanomaterial grow on CuMoO₄ nanomaterial flakes and entangle with each other,which can greatly increase the surface area of the material.The Raman spectra proved that CuMoO₄-Zn Mo O₄ composite material was successfully synthesized.The CuMoO₄ nanomaterial and CuMoO₄-Zn Mo O₄ composite material were dispersed in methyl acrylates to fabricate the organic glasses with different amounts by a heat casting method,respectively.The third-order NLO properties of CuMoO₄ and CuMoO₄-Zn Mo O₄were measured by an open-aperture and closed-aperture Z-scan technique.The experimental data were fitted and analyzed with the theoretical equations.The final results indicate that CuMoO₄ nanomaterial exhibits strong saturable absorption（SA）and self-focusing effects.As a saturable absorber,it has potential application prospects in mode-locked and Q-switch lasers.The CuMoO₄-Zn Mo O₄ composite material exhibits strong reverse saturable absorption（RSA）,self-defocusing effects and excellent optical limiting characteristics and has potential application value in laser protection and optical switch.