Gemini 180

Double monochromator

The Gemini 180 is a fully automated, double additive grating scanning monochromator. The incorporation of toroidal optics provides for optimum throughput and spectral resolution. The Gemini 180 functions as a high power, high purity light source for Fluorescence, detector characterization, and microscope illumination when coupled with one of our Xe Light Sources. It is ideal for applications that require low stray light such as:

  • Transmission
  • Absorbance
  • Reflectance
  • Fluorescence
Segment: Scientific
Manufacturing Company: HORIBA Scientific

Key Benefits of the Gemini 180 Monochromator:

  • Ultra-low stray light rejection of 10-9
  • Excellent for high purity tunable illumination
  • Fully automated
  • Monochromator or imaging spectrograph
  • USB interface





There is a wide selection of gratings to choose from depending on optical requirements.  Gratings are 50 mm x 50 mm for the Gemini 180. There are three different types of gratings available; classically ruled, holographic, and blazed holographic. There is also a flat mirror that may be ordered for the dual grating turret option. Please click on the link below to view all our grating options.

View Gratings

Computer Control

In addition to wavelength control the Gemini 180 has an optional automated turret control and automated control of the optional internal five position filter wheel. There are multiple software platforms to choose from for spectrometer control and acquisition. Please click on the link below to view all our software choices.

View Software

Optical Accessories

The Gemini 180 is compatible with many optical accessories to create your custom solution.  Please click on the link below to view some of our optical accessories.

View Accessories


Focal Length180 mm
Mechanical Range0-1400 nm
Grating Size50 mm x 50 mm
Resolution0.15 nm
Wavelength Accuracy± 0.5 nm
Repeatability± 0.1 nm
Spectral Dispersion (@500 nm)2.1 nm/mm
Stray Light1 x 10-9
BandpassContinuously adjustable from 0 to 15 nm (1200 gr/mm grating)
Wavelength ScanningDirect digital stepper-motor drive (worm drive)
Scan Speed160 nm/s
Step Size0.06 nm
Computer InterfaceUSB 2.0
DimensionsLength46.2 cm (18.2 in)
Width41.7 cm (16.4 in)
Height19.1 cm (7.5 in)
Weight18.1 kg (40 lb)

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