DDHR Grating Spectrometer
The DDHR (double-diffraction high-resolution) grating spectrometer gives the unique opportunities in terms of high etendue, fine spectral resolution and extremely high sensitivity to solve spectral-analytical problems even in the most challenging conditions.

  • Very high spectral resolution λ/Δλ up to 105
  • High etendue: F/7, slit height 10mm
  • Matrix detector EMCCD camera Andor Ixon Ultra DU-897 (sensitivity - dozen photons)
  • Large spectral range coverage λ/d from 0.65 to 1.4
  • Excellent stray light rejection
  • Compact design
  • High image quality

The spectrometer can be equipped with EMCCD camera Andor Ixon Ultra DU-897 where the amplification occurs when a charge in output register is clocked and has sufficient energy to create another electron-hole pair, - an analogue of avalanche amplification regulated up to single photon sensitivity.

Key advantages


  • The large dispersion and high throughput grating spectrometer operates in the first order of diffraction.
  • The angular dispersion invariant to wavelength tuning is the advantage offered by the mount.
  • In a condition of enhanced angular dispersion specific to the large diffraction angles, the spectral resolving power is no more limited by aberration image blur that results in use of a short focal length imaging optics permitting simplicity and compactness of the design.
  • The spectrometer flux luminosity is compared with Fabry–Perot interferometer of the same resolving power!
  • The use of the first diffraction order permits to combine the large angular dispersion and a broad free spectral range under the neighboring orders negligible overlap.

Main characteristics

CharacteristicMinTypicalMax
Grating, groove/mm240018001200
Spectral Range, nm300-700400-900600-1350
Focus, mm300
F#F/7
Slit height, mm10
Relative dispersion, nm/mm0.150.20.3
Limited Spectral resolution (slit 0.02 mm)0.0030.0040.006

Comparison with Jobin Yvon polychromators

ModelTHR10001000MU1000 (double)1250MDDHR
CompanyJobin YvonJobin YvonJobin YvonJobin YvonSpectral Tech
Focus, mm1000100010001250300
F#F/7.5F/8F/8F/9F/7
Relative dispersion, nm/mm0.80.80.40.650.2
Limiting spectral resolution (slit 0.02mm)0.0080.0080.0040.0060.005

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