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Raman Spectrum
The Raman Principle and the Components of a Raman Spectrometer
When light shines on a material, scattering occurs. In the scattered light, in addition to the excitation light, In addition to the elastic component (Rayleigh scattering) at the same frequency as the excitation light, there are also components with frequencies lower and higher than that of the excitation light. The latter phenomenon is collectively known as the Raman effect. It arises from elementary excitations such as molecular vibrations or optical phonons in solids interacting with the incident laser light. Interaction Generated Inelastic scattering Known as Raman scattering, generally the Rayleigh scattering The spectrum formed by combining Raman scattering is called a Raman spectrum.
Raman scattering, a non-destructive spectroscopic technique, is widely used across various fields—including life sciences and medicine, materials science, chemistry and pharmaceuticals, environmental and forensic applications, and emerging technological advancements—thanks to its ability to provide unique "fingerprint" information about molecular vibrations, chemical bond states, and material structures. The key advantages of Raman scattering lie in its non-invasive nature, high resolution, and broad applicability, making it particularly well-suited for: Live Detection 、 Microarea Analysis And Dynamic Process Monitoring Irreplaceable in the present. As laser technology and data-processing algorithms advance further in the future, their application boundaries will expand even more.
Principle of Raman Spectrometer
The Raman spectrometer primarily consists of Laser light source 、 Spectrometer And Raman probe It consists of components that also require coordination with external optical paths, a spectroscopic system, and systems for information reception, detection, and data processing. Raman spectrometers are generally categorized into integrated Raman spectrometers and modular, split-type Raman spectrometer products.
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Modular Raman Spectrometer | Portable Raman Spectrometer | Desktop Raman Spectrometer | Confocal Micro-Raman Spectrometer |
The laser used by Raman
Raman spectroscopy typically uses continuous-wave lasers, with common wavelengths of 257nm, 261nm, 320nm, 360nm, 405nm, 457nm, 473nm, 488nm, 514nm, 532nm, 633nm, 639nm, 671nm, 785nm, 830nm, 1064nm And so on. The most critical parameters of a Raman laser are spectral linewidth and wavelength stability, which is why narrow-linewidth and single-frequency lasers are typically required—after all, linewidth has a crucial impact on the accuracy of Raman detection results.
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Narrow-line-width laser | Single-Mode Laser |
Raman's fiber-optic spectrometer
Raman signals are typically weak, so fiber optic spectrometers must have high sensitivity and high quantum efficiency (>80%), with a signal-to-noise ratio exceeding 450:1—and also accommodate relatively long integration times.
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Raman 532–700 nm 、 Raman 785–1100 nm | Raman UV 185-240nm | Raman IR 1000-1550nm |
Raman probe
Typical Raman probe wavelengths include the 360 nm Raman probe, 405 nm Raman probe, 473 nm Raman probe, 488 nm Raman probe, 514 nm Raman probe, 532 nm Raman probe, 633 nm Raman probe, the 639 nm Raman probe, 671 nm Raman probe, 785 nm Raman probe, 830 nm Raman probe, and the 1064 nm Raman probe, among others.
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Standard Pull-Through Probe | Fiber-optic detachable probe | Gun-type Raman probe | Dual-channel Raman probe |
Raman-related accessories
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Raman uses a filter. | Planar Line-Engraved Diffraction Grating | Sample cell | Calibrating light sources, etc. | Support platform |
Typical Raman Application Cases
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Pharmaceuticals and Medical Diagnostics | Jewelry appraisal | Chemistry/Biology Research | Forensic Examination |
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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
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