As a powerful analytical technique, modern Raman spectroscopy has been widely used in the fields of biomedicine, material science, pharmaceuticals and chemistry.

However, the traditional single-wavelength Raman system in the face of the diversity of samples have greater limitations, while the dual-wavelength Raman system can be used at the same time two different wavelengths of the laser as an excitation source, the sample were irradiated and the collected scattering signals were modulated with two different wavelengths of the laser light modulated by the second harmonic light comparison can be derived from the desired Raman spectra.

784nm & 785nm Dual-Wavelength System
The 784nm & 785nm dual-wavelength configuration provides nearly identical wavelengths (only 1nm difference) , fully utilized its minimal difference, has achieved a great technological breakthrough . Relying on the fine tuning of the ultra-narrow linewidth laser, the spectral resolution of the system has reached a very high level, usually less than 0.1nm. The system is very suitable for the fine structural characterization of carbon materials and the stress analysis of semiconductor materials.

Due to their unique dual wavelength design, the 784nm & 785nm dual-wavelength systems offer unique value and advantages in practical applications. By conducting comparative study on the near-identical Raman spectra of graphene and carbon nanotubes, we can not only make a more in-depth understanding of the nature of the real Raman peaks and their relative intensities and other laws, but also eliminate the instrumental artifacts of the Raman peaks to obtain more reliable experimental data. Additionally, differential Raman spectroscopy can greatly improve the identification of active pharmaceutical ingredients in the pharmaceutical industry.

785nm & 1064nm Dual-Wavelength System

The 785nm and 1064nm dual-wavelength laser system, covers a wide spectral range from the visible to the near-infrared, making it particularly effective in the reduction of background interference in fluorescence. However, the Raman spectrum of 785nm remains the “gold standard” in most materials, obtain a good signal-to-noise ratio, while the 1064nm wavelength, due to its long wavelength, significantly minimizes the interference of fluorescence, especially suitable for the analysis of biological samples, organic compounds and some polymer materials.

It has shown broad adaptability and cost-effectiveness in practical applications. By switching the wavelength between 1064nm and 785nm, we can not only effectively reduce the interference of autofluorescence of tissues, thus greatly improving the clarity of the fingerprint spectra of biomolecules, but also make the detection of most of the routine biomolecules can be completed smoothly. Through the non-destructive and non-invasive analysis of forensic science and artwork at two wavelengths, it is possible to obtain “all-around” information on the composition of the substances contained therein, as well as on the internal microstructure of the artwork.

Future Prospects of Dual-Wavelength Raman Technology

The market demand for dual-wavelength Raman spectroscopy is also increasing as materials and life sciences continue to develop. Through the study of lithium batteries, we will be able to simultaneously on the structure of the electrode material changes and electrolyte decomposition products such as the characterization of multiple features to better study the dynamics of lithium batteries; at the same time, the study of polymers can also be enhanced through the selectivity of different wavelengths of the vibration signals of its specific functional groups, to provide a more comprehensive molecular structure of the information and so on.

Under the background of continuous breakthroughs in laser technology and continuous improvement of detector performance, dual-wavelength and even multi-wavelength Raman systems will be developed, which will greatly promote the development and application of Raman spectroscopy in the future with higher sensitivity, faster acquisition speed and stronger intelligent analysis.

Beijing RealLight has introduced a dual-wavelength narrow-linewidth lasers (784nm & 785nm and 785nm & 1064nm), enabling the use of two excitation wavelengths within a single system. This innovation significantly broadens the scope and flexibility of Raman spectroscopy applications. This product series enables the switching output of two narrow-linewidth, wavelength-stabilized lasers, delivering a range of exceptional precision measurement advantages in dual-wavelength Raman spectroscopy, making them the premier choice for cutting-edge Raman spectroscopy solutions worldwide.

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