DPSS Lasers for Raman Spectroscopy and Microscopy
What is Raman Spectroscopy?
Raman spectroscopy is a powerful analytical technique used to identify and characterise materials based on the way their molecules vibrate.
If a beam of light is directed onto a molecule, most of the light bounces off the molecule unchanged (called Rayleigh scattering). However, a tiny fraction of the light interacts with the molecule in a specific way, causing its vibrational state to change. This interaction alters the wavelength of the scattered light, giving rise to the Raman signal.
The unique pattern of these shifted wavelengths, known as the Raman spectrum, acts like a fingerprint for each molecule.
Advantages of Raman Spectroscopy:
Non-Destructive
Unlike some techniques, Raman spectroscopy doesn't damage the sample. This makes it ideal for studying delicate materials or biological samples.
Wide range of applications
Raman spectroscopy can be used to analyze a vast array of materials, from liquids and solids to gases and even living cells.
Fast and informative
Raman spectra can be obtained quickly, providing valuable information for research and quality control.
Here are some real-world examples of Raman spectroscopy in action:
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Analysing gemstones.
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Studying polymers.
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Investigating biological samples.
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Identifying counterfeit pharmaceuticals.
Raman spectroscopy is a versatile and powerful tool that continues to play a vital role in various scientific fields, from materials science and chemistry to biology and medicine.
Why lasers are crucial to Raman Spectroscopy
Monochromatic light
Raman scattering is a relatively weak phenomenon. Lasers provide a highly monochromatic (single-wavelength) light source, crucial for distinguishing the small Raman shift from the much stronger Rayleigh scattered light. Accuracy of that wavelength is imperative - Skylark NX lasers have an ultra-stable wavelength.
High intensity
The intensity of the Raman signal is directly proportional to the intensity of the incident light. Lasers offer high power and focus, significantly amplifying the weak Raman signal for better detection. NX lasers have an ultra-stable output power.
Spatial coherence
Lasers are spatially coherent, meaning their light waves are all in sync. This coherence allows for better focusing and collection of the scattered light, improving the overall sensitivity of the measurement. NX lasers have an ultra-narrow linewidth.
DPSS Lasers
Diode-pumped solid-state lasers combine the compactness of diode lasers with the higher power of traditional solid-state lasers, making them a versatile option.
Skylark Lasers are ideal for Raman Spectroscopy
Our single frequency continuous wave laser sources at 320, 349 and 532 nm offer unrivalled wavelength stability and a narrow linewidth. Our lasers have high degrees of spectral purity (>70 dB) with the added benefit of a narrow linewidth <1 MHz. Skylark lasers can be tailored for more demanding applications reaching high output powers on a small footprint. Applications such as:
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Materials inspection and characterisation
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Nonlinear optical imaging
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Confocal microscopy
