This study explores the effects of femtosecond laser pulses on Zinc Selenide (ZnSe), Germanium (Ge), and Silicon (Si), emphasizing laser-induced breakdown and the formation of Laser-Induced Periodic Surface Structures (LIPSS). Employing a 5.8 µm wavelength light at a 9 µJ per pulse energy, we document the ablation and structural changes in 5 mm thick samples. Our findings highlight the distinct responses of these materials to ultrafast, intense energy pulses, particularly noting the formation of LIPSS on ZnSe with a periodicity ∼1.5 times the wavelength of the incident light. These insights contribute to the broader understanding of material behavior under extreme laser conditions, offering avenues for advanced material patterning and surface engineering.
Raman spectroscopy is a powerful spectroscopic tool for remote and minimally invasive detection and chemical
identification of molecular species. Visible or infrared laser systems are often employed primarily due to their
great availability. Ultraviolet (UV) Raman spectroscopy offers several critical advantages over visible and infrared
systems, but is often limited by a high maintenance cost and low reliability of the laser system. We have
constructed a UV Raman spectroscopic system using a mercury capillary lamp with capabilities to capture
Raman spectra from 0 cm−1 to 4000 cm−1. The system’s low acquisition and maintenance cost, portability, high
sensitivity and specificity combined with minimal sample preparation make it ideal for the growing demands in
increased food quality and safety.
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