Outstanding nonlinear optical properties of all-inorganic perovskite CsPbX (X=Cl, Br, I) precursor solutions and polycrystalline films.

In this work, we systematically explore the third-order nonlinear optical properties of all-inorganic CsPbX (X = Cl, Br, I) perovskite precursor solutions and thin films using femtosecond and nanosecond laser pulses. We show that these samples possess strong two-photon absorption (TPA) and reverse saturable absorption (RSA), which depend on the excitation wavelength. The obtained nonlinear absorption and refraction coefficients for precursor solutions are followed by the relation CsPbCl > CsPbBr > CsPbI for the 800 and 1,064 nm excitation wavelengths, whereas this relation became reverse in the case of 355 and 400 nm laser pulses.

Enhanced Higher Harmonic Generation in Modified MAPbBrCl Single Crystal by Additive Engineering.

Mixed-halide perovskite materials (MHSCs) hold significant interest in photonics applications owing to their inherent advantages, including tunable bandgap properties, remarkable defect tolerance characteristics, and facile processability. These attributes position MHSCs as up-and-coming materials for various applications. However, the commercialization of these materials is severely affected by external factors, such as humidity and oxygen.

Aromatic Additives Boost the Terahertz Properties of Mixed Halide Perovskite Single Crystals.

Mixed halide perovskite (MHP) materials are promising candidates for photonic applications, owing to their tunable bandgap and pronounced optoelectronic properties. However, phase segregation in these materials severely impacts their scalability. The additive engineering (AE) strategy in the growth of most perovskite crystals (PSCs) has proven more effective.

High-Order Harmonics Generation in MoS Transition Metal Dichalcogenides: Effect of Nickel and Carbon Nanotube Dopants.

The transition metal dichalcogenides have instigated a lot of interest as harmonic generators due to their exceptional nonlinear optical properties. Here, the molybdenum disulfide (MoS) molecular structures with dopants being in a plasma state are used to demonstrate the generation of intense high-order harmonics. The MoS nanoflakes and nickel-doped MoS nanoflakes produced stronger harmonics with higher cut-offs compared with Mo bulk and MoS bulk.

Measurement of Optical Properties of CHNHPbX (X = Br, I) Single Crystals Using Terahertz Time-Domain Spectroscopy.

Organometallic lead bromide and iodide perovskite single crystals (PSCs) are potential candidates for terahertz applications. Herein, we performed terahertz time-domain spectroscopy (THz-TDS) in the frequency range of 0.1-3.

Harmonics Generation in the Laser-Induced Plasmas of Metal and Semiconductor Carbide Nanoparticles.

Carbon-containing plasma is an attractive medium for generation of harmonics of laser pulses in the extreme ultraviolet range. We ablate two metal carbide (BC and CrC) nanoparticles and silicon carbide (SiC) nanoparticles and generate harmonics after propagation of 35 fs pulses through the laser-induced plasmas. We analyze the spectra, spectral shifts, and splitting of harmonics from nanoparticles-contained plasmas, which demonstrate the chirp-related harmonic cut-off scaling.

High-order harmonics generation in nanosecond-pulses-induced plasma containing Ni-doped CsPbBrperovskite nanocrystals using chirp-free and chirped femtosecond pulses.

We demonstrate high-order harmonic generation in Ni-doped CsPbBrperovskite nanocrystals ablated by nanosecond pulses using chirp-free 35 fs, and chirped 135 fs pulses in the case of single-color pump (800 nm) and a two-color pump (800 and 400 nm). We analyzed the spectral shift, cut-off, and intensity distribution of harmonics in the case of chirped drving pulses compared to chirp-free pulses. It is shown that the presence of Ni dopants and CsPbBrplasma components improves the harmonics emission.

High-order harmonics generation in the laser-induced lead-free perovskites-containing plasmas.

High-order harmonics generation in the laser-induced plasmas produced on the surfaces of lead-free perovskites is studied. We analyze the harmonics generation in (CHNH)CuCl and (CHNH)CuBr plasmas during their ablation by the femtosecond, picosecond, and nanosecond pulses. The modifications of the high-order harmonics spectra are studied using the -color pump scheme (800 nm and 400 nm, 40 fs pulses).