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Raman spectrophotometry

Raman spectrophotometer

When light is incident on a material, a portion of the light is scattered. Scattered light contains light with the same wavelength as the incident light (Rayleigh scattered light) and that with different wavelengths (Raman scattered light). Raman spectroscopy is a method for examining the characteristics of Raman scattered light, which have wavelengths different from those of incident light, to determine the molecular or crystal structure of substances. Raman spectroscopy allows measurement of most inorganic compounds, organic matter, solids, liquids, gases, and so on without special pretreatment.

Example of Raman spectrophotometer configuration

Light source

A laser light source with narrow spectral width and high wavelength stability is used as a light source for Raman spectroscopy.

Spectrometer

The spectrometer disperses Raman scattered light. A polychromator with a diffraction grating is typically used.

Detector

Since Raman scattered light is extremely faint, a detector with high sensitivity is required. It is also favorable to simultaneously detect the multiple wavelengths that are dispersed, and for this reason, a linear image sensor is used. The appropriate sensor needs to be selected to match the measurement wavelength (wavenumber) range by considering the wavelength of the laser light source.

Measurement example

Raman spectrum of polystyrene plate (using spectroscopic module C13560 without SERS substrate)

Recommended products

Raman spectroscopic module

This is a ultra-compact Raman spectroscopic module that incorporates a 785-nm-laser, a mini-spectrometer, compact optical system, and other Hamamatsu original technologies. Measurement with Raman light enhanced 1,000 to 1,000,000 times is possible by using the dedicated SERS substrate J13856-01. The module is USB bus power driven and can be controlled from a PC using the included sample software. You can select the laser output from 5 mW, 10 mW, and 15 mW.
The laser output and module shape can also be customized.

Mini-spectrometers

The mini-spectrometers are provided in a compact, thin case that houses optical elements, image sensor, and driver circuit. Spectrum data can be acquired by guiding measurement light into a mini-spectrometer through an optical fiber and transferring the measured results to a PC via the USB connection. Several types are available for Raman spectroscopy.
 
C14214MA
- Spectral response range: 790 to 1050 nm
- Spectral resolution (half width): 0.4 nm typ.
- Number of pixels: 2048 ch
- Size (W×D×H): 100 × 60 × 12 mm
 
C13054MA
- Spectral response range: 790 to 920 nm
- Spectral resolution (half width): 0.4 nm typ.
- Number of pixels: 512 ch
- Size (W×D×H): 80 × 60 × 12 mm
 
C11713CA
- Spectral response range: 500 to 600 nm
- Spectral resolution (half width): 0.3 nm typ.
- Number of pixels: 2048 ch
- Size (W×D×H): 120 × 70 × 60 mm

InGaAs linear image sensor

This is an InGaAs linear image sensor designed for Raman spectroscopy measurement using a 1064-nm-laser. Designed specifically for measuring the Raman spectral range, the cutoff wavelength has been reduced from that of the previous product (G11508-512SA) to achieve low dark current.

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