Small-size two-channel spectrum analyzer SL40 Duo

The SL40 Duo series spectrometers manufactured by SOL instruments are small-size two-channel spectrum analyzers comprising two independent spectral channels of spectrograph and an embedded linear detector. The spectrographs have a focal length of 40 mm and an aperture ratio of 1/4.9. Diffraction gratings with different numbers of lines can be used in any spectrograph to allow adjustment both of the spectral range to be detected and the obtained spectral resolution.

The SL40 Duo spectrometer is a compact, reliable and easy to operate spectrum analyzer. To run the device you just need to connect it to the USB port of your PC and start the control program SpectraSP, which is a powerful software to carry out an extensive analysis of the obtained spectra.

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Description of compact spectrometer SL40 Duo

Small-size two-channel spectrum analyzer SL40 Duo

The SL40 Duo spectrometers are small-size two-channel spectrum analyzers. SL40 Duo comprises two independent spectral channels of spectrograph, which are arranged in one housing, and an embedded linear detector. Each of the spectrographs is designed on the original optical schematic with aspheric mirrors and achromatic objective lenses. The spectrographs have a focal length of 40 mm and aperture ratio 1/4.9.

Diffraction gratings with different numbers of lines can be used in any of the two channels to allow adjustment both of the spectral range to be detected and the obtained spectral resolution.

The diffraction gratings in both channels can be very accurately rotated using the adjusting screws, which allows you to set the required spectral ranges on the detectors.

The focal plane of each spectrograph, where a spectrum is formed, coincides with the plane of photosensitive elements of the embedded linear detector. The spectrum length, produced by each channel is a half of the detector length. The linear detector provides simultaneous spectra detection of both spectrographs.

One two-channel optical fiber (one input and two outputs), two single channel optical fibers or condensers can be used for delivery of light to SL40 Duo. With the two-channel optical fiber the light beam is divided into two equivalent channels to enter the input port of each spectrograph. Light of the same light source is detected in two channels of the spectrometer. The use of two single-channel optical fibers allows the light from two different light sources to be simultaneously delivered to the device and be detected.

SL40 Duo is a compact, reliable and easy to operate spectrum analyzer. To run the spectrometer you just need to connect it to USB port of PC and start the control program SpectraSP. SpectraSP is a powerful software to carry out different analysis of the obtained spectra. The spectrometer is powered through the computer’s USB port.

Optical scheme of SL40 Duo

Optical scheme of spectrometer SL40 Duo

SOL instruments methodical materials:

Features of SL40 Duo

  • Aspheric collimator mirrors, and a single-module unit with built-in detector
  • High spectral resolution with a small-size spectral device

  • The ability to accurately rotate diffraction gratings followed by automatic recalibration along the wavelength
  • High long-term stability, and a wide wavelength range from UV to near IR

Applications of SL40 Duo

  • Wavelength control of tunable laser
  • Spectral analysis of different radiation sources
  • Photometric measurements
  • Measurement of luminescent and Raman spectra

Specification of compact spectrometers of SL40 Duo series

Optical system

Optical scheme:original mirror-lens
F/number:1/4.9
Focal length:40 mm
Collimator mirror:aspherical
Lens:achromatic
Diffraction grating size:12 x 10 mm
Input:fiber optic or optical condenser
Overall sizes:117 х 80 х 40 mm
Weight:470 g
  • Optical scheme: original mirror-lens
  • F/number: 1/4.9
  • Focal length: 40 mm
  • Collimator mirror: aspherical
  • Lens: achromatic
  • Diffraction grating size: 12 x 10 mm
  • Input: fiber optic or optical condenser
  • Overall sizes: 117 х 80 х 40 mm
  • Weight: 470 g

Optical characteristics

Diffraction grating:600 l/mm1200 l/mm
Blazing wavelength:650 nm280 nm
Reciprocal linear dispersion (average):34.9 nm/mm17.8 nm/mm
Spectral resolution:< 0.8 nm< 0.45 nm
Detectable range:450 nm230 nm

Grating 600 l/mm

  • Blazing wavelength: 650 nm
  • Reciprocal linear dispersion (average): 34.9 nm/mm
  • Spectral resolution: less than 0.8 nm
  • Detectable range: 450 nm

Grating 1200 l/mm

  • Blazing wavelength: 280 nm
  • Reciprocal linear dispersion (average): 17.8 nm/mm
  • Spectral resolution: less than 0.45 nm
  • Detectable range: 230 nm

Board-level digital camera

Optical sensor type:high sensitivity, CMOS S13496
Number of active pixels:4096
Pixel size:7 μm x 200 μm
Spectral response:200 – 1070 nm
Max readout speed:software-driven: 1; 2; 3 or 5 MHz
Exposure time:from 11 μs up to 6 s (5 MHz)
Antiblooming:exists
Electronic shutter function:exists
Analog-digital converter (ABC):16 bit
Readout noise RSM:< 4.3 counts ADC (1 MHz); < 5 counts ADC (5 МHz)
Dynamic range:> 10000
Binning:1 x 2; 1 x 4
Synchronization:trigger IN and OUT, SHUTTER
  • Optical sensor type: high sensitivity, CMOS S13496
  • Number of active pixels: 4096
  • Pixel size: 7 μm x 200 μm
  • Spectral response: 200-1070 nm
  • Max readout speed: software-driven, 1; 2; 3 or 5 MHz
  • Exposure time: from 11 μs up to 6 s (5 MHz)
  • Antiblooming: exists
  • Electronic shutter function: exists
  • Analog-digital converter (ABC): 16 bit
  • Readout noise RSM: less than 4.3 counts ADC (1 MHz); less than 5 counts ADC (5 МHz)
  • Dynamic range: greater than 10000
  • Binning: 1 x 2; 1 x 4
  • Synchronization: trigger IN and OUT, SHUTTER

Fiber optics

Configuration:two-channel (1 input, 2 output); single-channel (1 input, 1 output)
Material:UV silica
Diameter:400 μm
Length:Standard: 0.5; 1; 2 m. Optionally – any other length is available.
  • Configuration: two-channel (1 input, 2 output); single-channel (1 input, 1 output).
  • Material: UV silica.
  • Diameter: 400 μm.
  • Length: Standard: 0.5; 1; 2 m. Optionally – any other length is available.

Software SpectraSP

Spectrum visualization mode:separated / joined
Scan modes:single spectrum / multi spectra
Cyclic (scan) mode:non-stop / counter
Accumulation:summing / averaging
Processing of peaks:find / measure of width and intensity / report
Smooth spectrum:exists
Photometry mode:transmission / absorption
Integration in wavelength range:exists
Real-time wavelength measurement:exists
Data compatibility with MS Excel:exists
  • Spectrum visualization mode: separated / joined
  • Scan modes: single spectrum / multi spectra
  • Cyclic (scan) mode: non-stop / counter
  • Accumulation: summing / averaging
  • Processing of peaks: find / measure of width and intensity / report
  • Smooth spectrum: exists
  • Photometry mode: transmission / absorption
  • Integration in wavelength range: exists
  • Real-time wavelength measurement: exists
  • Data compatibility with MS Excel: exists

Overall dimensions of spectrometer SL40 Duo

Dimensions of spectrometer SL40 Duo

Registration of Raman spectra using the SL40 Duo spectrometer

Spectrometer SL40 Duo from SOL instruments is an excellent solution for recording Raman spectra. Two channels of the device can be optimized either for simultaneous operation with two lasers or for obtaining twice higher spectral resolution.

Laser, nmGrating, L/mmSpectral range, сm⁻¹Spectral resolution, сm⁻¹
78590031908.8 – 6.3
785120022605.9 – 3.8
632.7120036659.9 – 7.0
632.7180020555.4 – 3.0
532180032558.5 – 5.5
4881800399510.6 – 7.1
488240025256.6 – 3.6
4052400418510.9 – 7.0
  • Laser 785 nm, grating 900 L/mm: spectral range 3190 сm⁻¹, spectral resolution 8.8-6.3 сm⁻¹
  • Laser 785 nm, grating 1200 L/mm: spectral range 2260 сm⁻¹, spectral resolution 5.9-3.8 сm⁻¹
  • Laser 632.7 nm, grating 1200 L/mm: spectral range 3665 сm⁻¹, spectral resolution 9.9-7.0 сm⁻¹
  • Laser 632.7 nm, grating 1800 L/mm: spectral range 2055 сm⁻¹, spectral resolution 5.4-3.0 сm⁻¹
  • Laser 532 nm, grating 1800 L/mm: spectral range 3255 сm⁻¹, spectral resolution 8.5-5.5 сm⁻¹
  • Laser 488 nm, grating 1800 L/mm: spectral range 3995 сm⁻¹, spectral resolution 10.6-7.1 сm⁻¹
  • Laser 488 nm, grating 2400 L/mm: spectral range 2525 сm⁻¹, spectral resolution 6.6-3.6 сm⁻¹
  • Laser 405 nm, grating 2400 L/mm: spectral range 4185 сm⁻¹, spectral resolution 10.9-7.0 сm⁻¹

Diffraction gratings for the SL40 Duo spectrometer: size 12 x 10 x 3 mm

Line density, mm⁻¹Blaze wavelength, nm*Reciprocal linear dispersion, nm/mmSpectral range, in which efficiency of the grating is more than 40%, nmSimultaneously registered
spectral range, nm
24002707.87185 – 540100
180027011.2185 – 540145
18005009335 – 1000115
120028017.7190 – 560230
120040016.9270 – 800220
120050016.1335 – 1000210
120060015.2400 – 1200195
120075013.5500 – 1500180
60028037.1190 – 560480
60035036.7235 – 700475
60045036.1300 – 900470
60065034.9435 – 1300450
60075034.2500 – 1500445
40028056.3190 – 560730
30035075.2235 – 700975
30050074.5335 – 1000965
30060074400 – 1200960
30070073.4470 – 1400950
200350113.6235 – 7001475
200500112.9335 – 10001465
200700112470 – 14001450

Gratings with line density
2400 mm-1

  • Blaze wavelength = 270 nm; *reciprocal linear dispersion = 7.87 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 185-540 nm; simultaneously registered spectral range = 100 nm.

Gratings with line density
1800 mm-1

  • Blaze wavelength = 270 nm; *reciprocal linear dispersion = 11.2 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 185-540 nm; simultaneously registered spectral range = 145 nm.
  • Blaze wavelength = 500 nm; *reciprocal linear dispersion = 9 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 335-1000 nm; simultaneously registered spectral range = 115 nm.

Gratings with line density
1200 mm-1

  • Blaze wavelength = 280 nm; *reciprocal linear dispersion = 17.7 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 190-560 nm; simultaneously registered spectral range = 230 nm.
  • Blaze wavelength = 400 nm; *reciprocal linear dispersion = 16.9 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 270-800 nm; simultaneously registered spectral range = 220 nm.
  • Blaze wavelength = 500 nm; *reciprocal linear dispersion = 16.1 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 335-1000 nm; simultaneously registered spectral range = 210 nm.
  • Blaze wavelength = 600 nm; *reciprocal linear dispersion = 15.2 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 400-1200 nm; simultaneously registered spectral range = 195 nm.
  • Blaze wavelength = 750 nm; *reciprocal linear dispersion = 13.5 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 500-1500 nm; simultaneously registered spectral range = 180 nm.

Gratings with line density
600 mm-1

  • Blaze wavelength = 280 nm; *reciprocal linear dispersion = 37.1 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 190-560 nm; simultaneously registered spectral range = 480 nm.
  • Blaze wavelength = 350 nm; *reciprocal linear dispersion = 36.7 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 235-700 nm; simultaneously registered spectral range = 475 nm.
  • Blaze wavelength = 450 nm; *reciprocal linear dispersion = 36.1 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 300-900 nm; simultaneously registered spectral range = 470 nm.
  • Blaze wavelength = 650 nm; *reciprocal linear dispersion = 34.9 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 435-1300 nm; simultaneously registered spectral range = 450 nm.
  • Blaze wavelength = 750 nm; *reciprocal linear dispersion = 34.2 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 500-1500 nm; simultaneously registered spectral range = 445 nm.

Gratings with line density
400 mm-1

  • Blaze wavelength = 280 nm; *reciprocal linear dispersion = 56.3 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 190-560 nm; simultaneously registered spectral range = 730 nm.

Gratings with line density
300 mm-1

  • Blaze wavelength = 350 nm; *reciprocal linear dispersion = 75.2 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 235-700 nm; simultaneously registered spectral range = 975 nm.
  • Blaze wavelength = 500 nm; *reciprocal linear dispersion = 74.5 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 335-1000 nm; simultaneously registered spectral range = 965 nm.
  • Blaze wavelength = 600 nm; *reciprocal linear dispersion = 74 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 400-1200 nm; simultaneously registered spectral range = 960 nm.
  • Blaze wavelength = 700 nm; *reciprocal linear dispersion = 73.4 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 470-1400 nm; simultaneously registered spectral range = 950 nm.

Gratings with line density
200 mm-1

  • Blaze wavelength = 350 nm; *reciprocal linear dispersion = 113.6 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 235-700 nm; simultaneously registered spectral range = 1475 nm.
  • Blaze wavelength = 500 nm; *reciprocal linear dispersion = 112.9 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 335-1000 nm; simultaneously registered spectral range = 1465 nm.
  • Blaze wavelength = 700 nm; *reciprocal linear dispersion = 112 nm/mm; spectral range, in which efficiency of the grating is more than 40% = 470-1400 nm; simultaneously registered spectral range = 1450 nm.

* At the blaze wavelength.