Raman Workstation
For Raman spectroscopy from ultraviolet 325nm to one micron infrared, single stage instruments are very effective. Equipped with good holographic notch or very-sharp edge filters they reject to about 300 or 350cm-1 shifts. Any spectra with larger shifts are easily measured.
Single stage instruments are simple. They are great for university and analytical spectroscopy. The reduced complexity accommodates teaching or diverse users and applications. Throughput of weak Raman light is improved by reduction of optical elements. McPherson's Raman Spectroscopy Workstation has excellent stray light rejection and is ideal for Raman spectroscopy in the Visible and Near Infrared.
Photo below left shows the Raman Workstation. Below right, the Model 125 macro sample chamber. The Model 125 Sample Handling System is useful for Raman and PL applications. It is available with an optional cryostat for cooling samples. It features an oversized collection lens system with locations for 1" dia notch filter and rotatable (film) polarizer. The sample holder has XYZ adjustments and holds micro capillaries, mini test tubes and the provided clip holds textiles, foils & solid samples.
Specifications
| Focal Length | 350mm (optionally 667 or 1000mm) |
| Slit Locations | Axial standard, Lateral optional |
| Slits | continuously adjustable from 0.01 to 4mm wide; 2 to 20mm high |
| f / No. | f/4.8 |
| Dispersion | 1.5nm/mm with 1800g/mm |
| Resolution | 1.5cm^-1 at 500 nm*** |
| Grating Size | (2X) 68*68mm; select from many gratings incl original (master) high fidelity holographic gratings |
| Drive Mechanism | High accuracy / high repeatability sine bar |
| Step Size | 0.0002nm |
| Wavelength Accuracy | +/-0.2nm (on counter, with 1200g/mm grating) |
| Wavelength Reproducibility | +/- 0.005nm (with 1200 G/mm grating) |
| Focal Plane | 30-mm, multiply dispersion by the width of detector for range |
| Wavelength Range | refer to grating of interest for range |
| Grating | Mechanical Range | CCD Coverage** | Resolution*** |
| 300 | 0 to 5000nm | 200-nm | 8cm-1 |
| 600 | 0 to 2500nm | 100-nm | 4cm-1 |
| 1200 | 0 to 1200nm | 50-nm | 2cm-1 |
| 1800 | 0 to 600nm | 33-nm | 1.5cm-1 |
* To work through a wide range, eg. 185 to 1000nm efficiently, more than one grating may be required.
**1-nm corresponds to about...
40cm-1 at 500nm
15cm-1 at 750nm
*** Resolution relative to 500nm, scanned with 10um wide slit