DMc150 Double Monochromator
Diffraction Gratings
A range of gratings are available depending on the spectral range of consideration. Diffraction gratings are supplied in pairs, on kinematic mounts to permit easy installation in the DMc150 without compromising the wavelength calibration.
| Grating | Line density (g/mm) | Grating type & Blaze wavelength | Maximum wavelength range (nm) |
|---|---|---|---|
| 2400 | Plane holographic, 250nm blaze | 200-600 | |
| 1800 | Plane holographic, 250nm blaze | 200-800 | |
| 1800 | Plane ruled, 500nm blaze | 200-800 | |
| GA-G1512R0U4 | 1200 | Plane ruled, 400nm blaze | 300-1,100 |
| 1200 | Plane ruled, 500nm blaze | 300-1,100 | |
| 1200 | Plane ruled, 750nm blaze | 450-1,100 | |
| 830 | Plane ruled, 1.2µm blaze | 650-1,700 | |
| GA-G1506R1U25 | 600 | Plane ruled, 1.25µm blaze | 800-2,400 |
| 600 | Plane ruled, 1.6µm blaze | 800-2,400 |
A filter wheel is located behind the entrance slit of the DMc150 to accommodate a shutter and long pass filters as required for the spectral range of operation. A six position filter wheel, for 25mm diameter filters is fitted as standard. An eight position filter wheel, for 22mm diameter filters is required where more positions are required.
| Spectral range | Required OS filter |
|---|---|
| <400 nm | Under standard conditions- none required |
| Under purged operation | OS310 |
| 400-700nm | |
| 700-1250nm | |
| 1250-2000nm | |
| 2000-3600nm |
Slit Configuration
The DMc150 can be configured in the compact, in-line or dual layouts. In the latter case a solenoid-driven programmable swing away mirrors (SAM), controlled by the internal drive electronics, is fitted for port selection.
Slit Type
The dimension of the largest of the entrance/ exit slits defines the bandwidth of the monochromator. Fixed, micrometer variable and motorised variable slits are offered, with a slit height of 20mm. For tuneable light source applications a range of exit slit apertures are available. Please enquire for further information.
| Slit type | Features |
|---|---|
| Fixed slits (FSS) | - Manually controlled - Spring leaf to ensure the correct placement of the slit |
| Micrometer variable slits (VSS) | - Manually controlled - Bi-lateral slits - Variable from 10µm to 10mm |
| Motorised variable slits (MVSS) | - PC control via USB - Driven via internal monochromator electronics or external MAC electronics bin - Comprising stepping motor driven bi-lateral slits - Variable from 10µm to 10mm |