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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] 

S150 - versatile

S150 - versatile compact spectrometer


The compact spectrometers of series S150 provide a wide range of gratings and detectors to meet the specific user requirements and allow matched selection of spectral range and resolution. S150-II versions have two built-in gratings, which can be easily selected by a shutter. All devices are fiber-coupled, operate by USB without external power supply and come with user-friendly software.


Bezeichnungen der Tabs

  • Description
  • Specifications
  • Spectrum
  • Pictures
Tab 1


  • High resolution – up to 15pm
  • Compact design
  • No need for an external power source
  • Choice of spectral ranges and resolutions tailored to your requirement

The S150 spectrometer is designed to analyse spectra of CW and pulsed laser light sources. Due to its relatively low aperture ratio and high spectral resolution the S150 perfectly suits for wavelength measurements of lasers, diodes and other sources emitting high-power optical signals.

The spectral range and resolution (i.e. grating lines density) are chosen at the time of placing your order. For your convenience the SPECIFICATIONS lists the average values of grating dispersion, spectral resolution and multichannel array bandpass corresponding to a certain grating. Contact a SOLAR LS specialist for more precise calculation of parameters for your instrument.

The S150 may contain a CCD detector based on either one of three non-cooled linear image sensors (see the SPECIFICATIONS). The TCD1304 linear image sensor is the most popular due to its high sensitivity and narrow pixels capable of providing high spectral resolution.

The S150 is convenient and easy to use: it is calibrated by the manufacturer, does not contain any movable parts, is controlled and powered from the computer via the Full-Speed USB interface.

The S150 can be triggered from your light source with standard TTL trigger pulses via connector BNC-58. The S150 is also able to produce TTL trigger pulses.

The S150 delivery set contains a USB control cable, direct and reverse synchronisation cables and UV optical fiber. Light input with the optical fiber provides flexible arrangement of your instrumentation system. The spectrometer is able to operate without the optical fiber, with analysed light steered directly to its input slit.

To meet both of the conflicting demands, high resolution and wide operation range, within a single compact device we have developed the two-channel spectrometer S150-II.

The optical bench design of the S150-II two-channel spectrometer provides possibility of installing either two of diffraction gratings listed in the SPECIFICATIONS, with alternate recording of channels spectral ranges.

Yet the optical bench of the S150-II spectrometer does not contain any movable parts. The only moving element is a shutter which interrupts the optical beam in one of the channels. The shutter is moved from one channel to the other (changing the spectral operation range of the S150-II spectrometer) manually by a simple turn of the two-position switch.

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 S150 Optical scheme

The S150 Optical Schematic

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S150-II Optical scheme 

The S150-II Optical Schematic

Having chosen proper diffraction gratings for two channels of the S150-II spectrometer you are able to observe either:

  • two spectral intervals with the same resolution located at different spectrum regions within the operation range of two identical diffraction gratings (analogue to two identical S150 spectrometers);
  • wide spectral interval (up to 200-1100 nm) with resolution of 0.5nm and a selected narrow spectrum range with resolution up to 0.015 nm (analogue of two S150 spectrometers with different gratings), as well as other combinations of spectral ranges at your choice.
Tab 2
Optical bench Czerny-Turner
Focal Length, mm 150
F/Number 1 :12
Entrance slit width, mm height, mm 0.018 3
Diffraction grating one of the following (two for the S150-II)
lines/mm 200 300 400 600 1200 1800 1800 2ndorder 1800 3rdorder
Reciprocal dispersion (average), nm/mm 33 21.5 16 10.5 5 3.3 1.4 0.8
Spectral Resolution (average), nm1) 0.66 0.44 0.32 0.21 0.1 0.06 0.025 0.015
Spectral range, nm 200-1100 200-1100 200-1100 200-1100 200-1100 200-800 200-450 200-350
Multichannel array bandpass, nm 920 620 460 310 150 95 40 23
Computer Interface Full-Speed USB
Optical Input UV Optical Fiber 0.6 (0.4)mm diameter, 1m lengh SMA-905 connector
Dimensions, mm 155 x 200 x 105
Weight, kg 2,5

1) Spectral resolution of the S150 spectrometer is indicated for the detection system based on the TCD1304 linear image sensor.

LINEAR IMAGE SENSOR TCD1304 3648 pixels pix.size 8mm TCD1205 2048 pixels pix.size 14mm S8378-1024 1024 pixels pix.size 25mm
Active area size, mm 29.18 x 0.2 28.67 x 0.2 25.6 x 0.5
Min. exposure time, ms 7.3 4.1 2.0
Max. exposure time, s1) 0.5 4.0 5.0
Max. S/N for 1 Scan 400 : 1 400 : 1 1000 : 1
Antiblooming2) no yes yes
Dynamic Range 900 : 1 1000 : 1 3500 : 1
Photo sensitivity, V/lux×s3) 160 80 22 (HS) 4.4 (LS)
Readout noise, ADC counts 18 14 16 (HS) 3) 4.4 (LS)
ADC Resolution 14 bit, 16384 counts
Synchronization IN/OUT
Requirements to external trigger pulse  
- polarity Positive
- amplitude, V 3-15
- pulse duration FWHM, µs 5-20
- connector BNC-58
Parameters of the trigger pulses  
- polarity Positive
- amplitude, V 4-5
- pulse duration FWHM, µs 10

1) Max. exposure time is the time when the dark signal reaches 10% of the dynamic range at +25°C ambient.

2) Antiblooming is a sensor feature eliminating charge overflow from exposed pixels to surrounding pixels.

3) The S8378-512 linear image sensor provides possibility of control over sensitivity mode: high (HS) or low (LS).

Tab 3


The S150 spectrometer with the diffraction grating 1800 lines/mm, operating in the 3rd spectral order within the range 200-350nm (width of the simultaneously recorded spectral interval is 23nm) allows resolving lines of Hg 313.184nm and 313.155nm, with distance between lines 29pm. A fragment of the respective spectrum is shown below.

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Fragment of emission spectrum of the mercury lamp recorded by the S150 spectrometer with the 1800 lines/mm grating

Tab 4

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