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Real-time stimulated Raman spectroscopy with a non-collinear optical parametric oscillator
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Researchers developed a fast, tunable Raman spectroscopy system to detect microplastics in real time using a non-collinear optical parametric oscillator. The technique could enable live water quality monitoring for microplastic contamination in flow systems.
Ultrafast detection of microplastic particles is becoming a vital problem, as these particles are found in water sources worldwide. Ideally, a live analysis in flow is desirable to directly monitor the water quality for contaminations. Therefore, coherent Raman spectroscopy techniques require fast and broadband tunable lasers to address all relevant spectral regions of the investigated samples. In our work, we combine a high power non-collinear optical parametric oscillator with a real-time stimulated Raman scattering spectroscopy setup. The light source is continously tunable from 700 nm to 1030 nm in less than 10 ms, delivering an average output power of more than 500 mW with sub-ps pulses. We show the immediate observation of mixing processes and the detection of microplastic particles in water solution with a spectral window of more than 2000 cm-1.
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Researchers developed a dual-laser Raman strategy that simultaneously captures backscattering and transmission signals from two 532 nm lasers to quantify microplastics directly in water without filtration or drying, achieving roughly 1.5- to 3-fold greater signal stability and accurate real-time particle counting at 0.1-second temporal resolution.
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Researchers developed a novel system using Raman spectroscopy combined with optical line tweezers to simultaneously analyze the shape and chemical composition of microplastics flowing through a channel. The technique can capture and characterize particles as small as 500 nanometers, offering a potential tool for real-time monitoring of microplastics in water environments.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.