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Two dimensional (2D) ternary chalcogenides, a significant class of optoelectronic materials, exhibit distinctive structures and possess exceptional physical and chemical properties. In this study, a novel 2D ternary chalcogenide, Ta2NiTe5, is synthesized using the liquid‐phase exfoliation technique to create a high‐quality saturable absorber (SA). The nonlinear optical characteristics of the prepared Ta2NiTe5 nanosheets, ranging from 500 nm to 3.0 µm, are investigated using the P‐scan and open‐aperture Z‐scan methods. Furthermore, the stable passively Q‐switched lasers based on the Ta2NiTe5‐SA device are realized with a minimum pulse width of 326 ns, 2.18 µs, and 850 ns at 1.0, 2.0, and 3.0 µm wavelengths, respectively. The findings not only provide further evidence of the promising potential of 2D ternary chalcogenides as an SA for the achievement of broadband pulsed lasers, but also pave the way for promoting their potential applications in optoelectronic devices. [ABSTRACT FROM AUTHOR]

Materials with multiple nonlinear-optical responses have been investigated widely in recent years. Here, we report a hybrid system with both giant multiphoton absorption (MPA) and efficient third harmonic generation (THG) excited by near-infrared femtosecond laser pulses. The hybrid material consists of both CsPbBr3 quantum dots and metal–organic framework microparticles. The two-, three-, four-, and five-photon absorption cross-sections of the hybrid material are three orders of magnitude greater than those of CsPbBr3 micro-crystals. The effective χ(3) values are three orders of magnitude greater than those of α-quartz. Our findings demonstrate a new avenue to realize photo-stable, high-order MPA, and THG in microparticles synthesized using a cost-effective method. [ABSTRACT FROM AUTHOR]

Recently, there have been intensive and extensive research works on perovskites because of their excellent electrical and optical properties. This review is focused on their multiphoton absorption (MPA) and applications. All the MPA coefficients or cross‐sections reported in the literature are summarized. Many experimental data show that the MPA strengths of nanoscale perovskites are several orders of magnitude greater than their bulk counterparts. The second‐ and third‐order quantum perturbation theories predict that, while the two‐band transitions play a significant role in 3D crystals of perovskites, the exciton‐light interactions dominate in the case of 2D perovskites. Other influencing factors on the MPA magnitudes are also discussed. Their potential applications are also highlighted in laser‐frequency upconversion and sub‐bandgap photodetection. [ABSTRACT FROM AUTHOR]