Our HES Spectrometers
The Benefits of Our HES Spectrometers
Traditional spectrometers use a slit to allow light to pass into the instrument and focus on the target substance. Our spectrometers are different: we use optical fibres of 1 mm – 3 mm, although a 5 mm is possible.
Using a fibre rather than a slit aids transmission; where light is usually lost, it is retained and, therefore, can be focused on the target. More light on the target delivers a stronger signal, particularly helpful when measuring substances with weak Raman signals.
ISI’s standard HES spectrometer offers a 100-fold increase in throughput over current conventional systems. This increased throughput can lead to a superior signal-to-noise ratio (SNR) for a given observation over a Czerny Turner instrument. The HES spectrometer contains no moving parts and yet offers the advantages of a Michelson Interferometer with the spectral properties of a traditional diffraction grating-based device, such as a Czerny Turner spectrometer.
Product Specifications
HES Spectrometer
The high throughput/etendue of our HES spectrometers results in the instruments being ideal for low light applications and makes it possible to couple the devices via a large multimode optical fibre. They are, therefore, easy to use with a large optical telescope, unlike Czerny Turner systems with comparable resolution. Our HES spectrometers are capable of stand-off measurements at a range of 2-3 meters.
The spectrometer is available as a stand-alone instrument or a fibred-coupled Raman spectrometer, typically with a 500 mW 785 nm laser.
Detectors are available according to the end-user requirements, from ultra-low light, cooled CCD to simple CMOS devices.
- HES 1001 – 1mm fibre and standard detector. Ideal for brighter or less challenging measurements.
- HES 2002 – 2mm fibre and superior detector allow long integration times. Ideal for difficult or standoff measurements or samples that give off weaker signals.
- HES3003 – 3 mm fibre and photon-counting CCD ideal for biological applications.
Specification
| Feature | Detail |
| Operating range | 50-4000 cm-1 dependent on detector choice |
| Resolution | < 2 cm-1 |
| Fibre coupled | SMA (FC/PC available) |
| Fibre aperture | 1 mm (standard) up to 5 mm |
| Fibre NA | 0.22 |
| Detector | Choice available |
| Power | Detector dependent |
| Mass | < 2 kg |
Applications for our HES instruments:
- Raman spectroscopy
- Transmission Raman spectroscopy
- Emission spectroscopy
- Fluorescence spectrometry
- Reflectance spectrometry
- Astronomical applications