Raman spectroscopy is an analytical technique used to identify and quantify the chemical composition and structure of a sample by the analysis of scattered light.
Wavelength - The strength of the Raman signal is directly dependent on the wavelength of the laser source, where lower wavelengths will produce stronger Raman signals, as well as allowing for higher spatial resolution. It is important, however, to balance this observation with the occurrence of background fluorescence, prevalent in many materials throughout the UV-visible spectrum, and the possibility of sample damage at high energy. These effects most often cause a compromise in the wavelength of the source used, where longer wavelengths, such as 532 nm, 785 nm, and 1064 nm, in combination with highly sensitive detectors, allow for the widest range of samples to be measured.
Spectral Linewidth & Purity - The spectral linewidth of the laser source should also be considered, as it will limit the possible resolution of the Raman measurement as well as the minimum energy change that can be determined. It is important for the laser selected to have a linewidth below the overall resolution of the Raman spectrometer, on the order of picometers. For high-resolution spectroscopy, this is critical and requires linewidths below 1 MHz. High spectral purity will also increase the signal-to-noise ratio from the measurement.
Beam Quality - The beam quality is related to the possible spatial resolution. Here, single transverse mode beams (TEM00) are vital for confocal Raman Spectroscopy, in particular, allowing for high spatial control in all three axes, improving spatial resolution, and decreasing background effects.
Brandnew can provide butterfly fiber coupled diode laser source for raman spectroscopy.
Model 1: 100mW 532nm
Center Wavelengths 532nm
14-Pin, Hermetically Sealed Butterfly Package
Integrated Isolator, Thermoelectric Cooler (TEC), Thermistor, and Monitor Photodiode
Typical Linewidths as Narrow as 1 MHz
Model 2: 600mW 785nm
Wavelength-Stabilized
600mW output power
785nm wavelength
105µm fiber core diameter
Narrow Bandwidth <0.12nm
Model 3: 800mW 1064nm
Optional built-in thermistor
Compact structure, good heat dissipation performance
Small size and light weight
±0.5nm wavelength tolerance
More details, pls contact us via Email or Whatsapp:
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Email: info@brandnew-china.com