DM160 Monochromator

The DM 160 is a high throughput double monochromator with dispersion subtraction, with F/number 3.5 and focal length 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.

DM160 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 1100 nm). You should move the switcher vertically to set the necessary spectral interval.




  • Concave diffraction gratings with a variable spacing of lines
  • Extremely low stray light
  • Highly motorized
  • Embedded motorized unit of order sorting filters



  • Tunable filter with a narrow bandwidth and extremely low stray light
  • Transmittance and reflectance measurement in UV to VIS range
  • Excitation monochromator for the fluorescence measurements
  • Raman measurements



SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. DM160 optich SH orang



SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. book-2

Theory & Instructions
1. Spectral Instrument. Basic Concepts and Characteristics.
2. Spectral Devices. A Spectral Device Selection. 
3. Spectra Detection. Detector Selection.


Optical system:

Optical scheme: Original, with dispersion subtraction
F\number: 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


Motor: micro stepper
Drive: warm
Step size: 3.375 arc seconds
Precision: ± 1 step
Max. speed: 10 000 steps/s


Type: Ruled, concave, with a variable line density
Line density: 1200 l/mm
Blaze wavelength: 280 nm
Size: 40 х 40 х 10 mm
Operating wavelengths range (efficiency of grating > 40%): 190 – 560 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

Spectral slits

Control: manually operated
Width: 4 fixed positions
Entrance and intermediate: 0.22; 0.54; 1.1; 1.6 mm
Output: 0.44; 1.08; 2.2; 3.2 mm
Height: 6 mm

Integrated shutter

Shut time: ~100 ms
Max. frequency: 1 Hz
Control: On-board CPU or TTL-signals from the external device

Dimensions, power requirements

Overall sizes (LхWхH): 419 х 140 х 175 mm
Weight: 8 kg
Electric requirements: 100 – 230 V, 50/60 Hz
Power consumption: 20 W


Central: on-board CPU
External: PC
External interface: Ethernet


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.

Dimensional drawing:


DM160 overall sizes