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Raman Spectrum
The Raman Principle and the Components of a Raman Spectrometer
When light irradiates a substance, scattering occurs. In the scattered light, in addition to the elastic component with the 
same frequency as the excitation light (Rayleigh scattering), there are components with frequencies lower and higher than the excitation light. This phenomenon is collectively referred to as the Raman effect. The inelastic scattering produced by the interaction between elementary excitations such as molecular vibrations and optical phonons in solids with the excitation light is called Raman scattering. The spectrum formed by combining Rayleigh scattering and Raman scattering is generally called the Raman spectrum.
As a non-destructive spectral analysis technique, Raman scattering is widely used in life sciences and medicine, materials science, chemistry and pharmacy, environmental and forensic science, and emerging technology expansion because it can provide unique "fingerprint" information about molecular vibrations, chemical bond states, and material structures. The application advantages of Raman scattering lie in its non-invasiveness, high resolution, and wide applicability, making it irreplaceable especially in in vivo detection, micro-area analysis, and dynamic process monitoring. In the future, with advancements in laser technology and data processing algorithms, its application boundaries will be further expanded.
Principle of Raman Spectrometer
The Raman spectrometer mainly consists of a Laser light source a Spectrometer , and a Raman probe. It also needs to be equipped with an external optical path, a spectral separation system, information reception, detection, and processing system components. Raman spectrometers are generally classified into integrated Raman spectrometers and combined split-type Raman spectrometer products.
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Lasers for Raman Applications
Lasers used for Raman applications are generally continuous lasers, with typical wavelengths including 257nm, 261nm, 320nm, 360nm, 405nm, 457nm, 473nm, 488nm, 514nm, 532nm, 633nm, 639nm, 671nm, 785nm, 830nm, 1064nm, etc. The key parameters of Raman lasers are spectral linewidth and wavelength stability, so narrow linewidth and single-frequency lasers are generally required. The linewidth has a crucial impact on Raman detection results.
Fiber Spectrometer for Raman Applications
Raman signals are generally weak, so fiber spectrometers are required to have high sensitivity and high quantum efficiency (>80%), with a signal-to-noise ratio greater than 450:1 while simultaneously satisfying long integration times.
Raman Probe
Typical wavelengths for Raman probes include 360nm Raman probe, 405nm Raman probe, 473nm Raman probe, 488nm Raman probe, 514nm Raman probe, 532nm Raman probe, 633nm Raman probe, 639nm Raman probe, 671nm Raman probe, 785nm Raman probe, 830nm Raman probe, and 1064nm Raman probe, etc.
Accessories
Raman Spectrometer Applications
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Pharmaceuticals and Medical Diagnostics | Jewelry appraisal | Chemistry/Biology Research | Medical Identification |
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Textile Printing and Dyeing Industry | Food Safety Testing | Food and Agriculture | Dangerous Goods Inspection |
Raman spectrum diagram (successfully matched)
Natural diamonds | HPHT | CVD | Polystyrene - PS |
Polyethylene terephthalate – PET | High-Density Polyethylene - HDPE | Archaeological porcelain shards | Medicine - Aspirin |
Graphene | Zircon | Polytetrafluoroethylene | Ethanol |
Changchun New Industries Optoelectronics Technology Co., Ltd.
Address: No. 888 Jinhu Road, High-Tech Zone, Changchun, 130103, P.R.China
International Tel:+86-431-85603799
Email: sales@cnilaser.com
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