We report the synthesis of Ag–Au alloy nanoparticles (NPs) by post-irradiation of mixed colloidal Ag and Au NPs by a nanosecond pulse laser in the presence of an external electric field (EEF). In our study, size, optical, and plasmonic properties of colloidal Ag–Au alloy NPs were investigated. A colloid of individual Ag and Au NPs were separately prepared by nanosecond pulsed laser ablation in distilled water. An appropriate volume of these colloidal NPs samples was mixed and post-irradiated with the same pulsed laser beam in the presence of a uniform electric field, resulting in the formation of Ag–Au alloy NPs. The synthesized colloidal alloy NPs were characterized using scanning electron microscopy and UV–vis absorption spectroscopy. The results indicate that the EEF can reduce significantly the Ag–Au alloy formation time. The results also show that the wavelength of the localized surface plasmon resonance of alloy NPs decreased by the applied electric field.
In this paper, we present results of experimental investigation of the thermal lens effect in ethanol by a dual beam arrangement. The influence of thermal lens strength on a probe beam passing through this thermal lens medium was analyzed. Thermal lens was induced by focusing the beam of a high power diode laser in ethanol and the profile of a He-Ne laser as a probe beam was inspected. The comparison of the He-Ne laser beam profile in the condition of various diode laser beam powers shows that the beam quality of the probe can be significantly affected and the its deformed profile depends on the strength of thermal lens effect.
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