Raman Spectrometers
What is Raman Spectroscopy?
Raman is a spectroscopic technique that uses laser light to interact with molecular excitations and determine what a substance or element is composed of. It relies upon the inelastic scattering of photons which produces a weak signal, making the collection of information challenging particularly when the substance to be measured is at distance or can only be given short exposure times. Our Raman spectrometers are particularly effective at making Raman measurements due to their configuration which delivers a higher throughput/etendue than standard instruments.
Raman Spectrometers
HES Raman Spectrometers
Most spectrometers rely on a slit (aperture) to allow light to enter the instrument and reach the target sample. The size of the aperture affects throughput and resolution, with a narrow slit increasing resolution but decreasing signal strength. This typically presents a challenge for Raman measurements where signal strength is already a factor.
Our HES spectrometer range uses a fibre, typically of either 1 ml, 2 ml or 3 ml although up to 5ml is possible. Using a fibre aids transmission as the light that would normally be lost, particularly where a larger aperture is required, is retained. This makes the instrument significantly more sensitive to identifying Raman scatter.
As a result, our ultra-high-throughput/etendue HES spectrometers are ideal for Raman spectroscopy, capable of stand-off measurements at a range of 2 m – 3 m.
Specification
| Feature | Detail |
|---|---|
| Excitation wavelength | 785 nm |
| Laser power | 500 mW |
| Operating range | 200 – 3000 cm-1 Dependent on detector (Assuming 1320 pixels) |
| Resolution | 4 cm-1 |
| Fibre coupling | SMA (FC/PC available) |
| Fibre core diameter | 1 mm |
| Fibre NA | 0.22 |
| Detector | Choice available |
| Power | Detector dependent |
The standard instrument configuration has an excitation laser operating at 785 nm.