High throughput double monochromator DM160
Model DM160 from SOL instruments is a high throughput double monochromator with dispersion subtraction, F/number of 3.5 and focal length of 160 mm. DM160 is completely automated: there is an on-board CPU to control the gratings, choose the necessary light filter and control the integral shutter. The device is controlled by means of the specially developed software.
The distinctive features of the automated double monochromator of the DM160 series are: high aperture, extremely low level of stray light, high spectral resolution, full control from a PC, as well as an integrated light filters unit for eliminating the highest orders of diffraction.
Description of double monochromator DM160
Automated monochromator DM160
The DM160 model is a high throughput double monochromator with dispersion subtraction, F/number of 3.5 and focal length of 160 mm.
DM160 monochromator is a completely automated device using the on-board CPU to control the gratings, choose the necessary light filter and control the integral shutter.
The device is controlled by means of the specially developed software, on-board CPU uses RS-232-interface for connection with the computer.
Due to the use of only four optical elements and the intermediate slit, the DM160 possess an extremely low stray light and high spectral resolution.
The DM160 double monochromator is designed on the linear scheme, input and output ports are arranged in one line and in one height. The entrance and exit slits mounted in the input and output ports respectively, as well as the intermediate slit, are adjusted manually. There are four fixed slit widths corresponding to four values of the spectral interval (for the central wavelength of 1100 nm). You should move the switcher vertically to set the necessary spectral interval.
Optical scheme of DM160
Features of DM160
- Concave diffraction gratings with a variable spacing of lines
- Extremely low stray light, high spectral resolution, highly motorized, computer controlled
- Embedded motorized unit of order sorting light filters
Applications of DM160 monochromator
- Tunable filter with a narrow bandwidth and extremely low stray light
- Transmittance and reflectance measurement in ultraviolet to visible spectral ranges
- Excitation monochromator for the fluorescence measurements
- Raman measurements
Specification of high throughput automated monochromator DM160
Optical system
| Optical scheme: | original, with dispersion subtraction |
| F\number (entrance): | 1/3.6 |
| Focal length (output): | 160 mm |
| Stray light (halogen lamp with 350 nm cut-off filter): | < 0.01 % |
| Stray light (20 nm from laser line): | 10-7 |
- Optical scheme: original, with dispersion subtraction
- F\number (entrance): 1/3.6
- Focal length (output): 160 mm
- Stray light (halogen lamp with 350 nm cut-off filter): less than 0.01 %
- Stray light (20 nm from laser line): 10-7
Drive
| Motor: | micro stepper |
| Drive: | warm |
| Step size: | 3.375 arc seconds |
| Precision: | ± 1 step |
| Maximal speed: | 10 000 steps/s |
- Motor: micro stepper
- Drive: warm
- Step size: 3.375 arc seconds
- Precision: ± 1 step
- Max. speed: 10000 steps/s
Optics
| Reciprocal linear dispersion for first monochromator (wavelength 546 nm): | 5.2 nm/mm |
| Reciprocal linear dispersion for double monochromator: | 0 nm/mm |
| Spectral resolution: (width of entrance and intermediate slits 0.22 mm) | 1.3 nm |
| Repeatability: | ± 0.1 nm |
| Wavelength accuracy: | ± 0.25 nm |
| Average scanning step: | 0.025 nm |
- Reciprocal linear dispersion for first monochromator (wavelength 546 nm): 5.2 nm/mm
- Reciprocal linear dispersion for double monochromator: 0 nm/mm
- Spectral resolution (width of entrance and intermediate slits 0.22 mm): 1.3 nm
- Repeatability: ± 0.1 nm
- Wavelength accuracy: ± 0.25 nm
- Average scanning step: 0.025 nm
Gratings
| Type: | ruled, concave, with a variable line density |
| Line density: | 1200 l/mm |
| Blaze wavelength: | 280 nm |
| Size of grating: | 40 х 40 х 10 mm |
| Operating wavelengths range: (efficiency of grating is greater than 40%) | 190 – 560 nm |
- Type: ruled, concave, with a variable line density
- Line density: 1200 l/mm
- Blaze wavelength: 280 nm
- Size of grating: 40 х 40 х 10 mm
- Operating wavelengths range (efficiency of grating is greater than 40%): 190-560 nm
Spectral slits
| Control of slits: | manually operated |
| Width of slits: | 4 fixed positions |
| entrance and intermediate slits: | 0.22; 0.54; 1.1; 1.6 mm |
| output slit: | 0.44; 1.08; 2.2; 3.2 mm |
| Height of slits: | 6 mm |
- Control: manually operated
- Width: 4 fixed positions
- Width of entrance and intermediate slits: 0.22; 0.54; 1.1; 1.6 mm
- Width of output slit: 0.44; 1.08; 2.2; 3.2 mm
- Height: 6 mm
Integrated shutter
| Shut time: | ~100 ms |
| Maximal frequency: | 1 Hz |
| Control: | on-board CPU or TTL-signals from the external device |
- Shut time: ~100 ms
- Maximal frequency: 1 Hz
- Control: on-board CPU or TTL-signals from the external device
Dimensions, power requirements
| Overall sizes (L х W х H): | 419 х 140 х 175 mm |
| Weight: | 8 kg |
| Electric requirements: | 100 – 230 V, 50/60 Hz |
| Power consumption: | 20 W |
- Overall sizes (L х W х H): 419 х 140 х 175 mm
- Weight: 8 kg
- Electric requirements: 100-230 V, 50/60 Hz
- Power consumption: 20 W
Control
| Central control: | on-board CPU |
| External control: | PC |
| External interface: | Ethernet |
- Central control: on-board CPU
- External control: PC
- External interface: Ethernet
Double monochromator DM160 is a fully automated device. The embedded controller exercises a regular control of execution of the control commands of mechanisms of the device that enter from external control unit. Besides, the internal controller operates ADC board that can be used optionally.
External control is performed from the computer using the special DevCtrl software.
Dimensional drawing of the monochromator DM160
