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You are here:   » Products » Optical Technologies » Equipment » Spectrometers » ORIEL Spectroscopy Instruments » 1/4 m Imaging Spectrographs MS260i

ORIEL Spectroscopy Instruments

1/4 m Imaging Spectrographs MS260i

Key Features

  • RS-232, USB and GPIB models models
  • High resolution
  • Up to three gratings, with computer controlled grating change
  • Built-in shutter
  • Built-in filter wheel control


1/4 m Imaging Spectrographs MS260i

The MS260i™ ¼ m Imaging Spectrographs are economical, fully automated, multi-grating instruments. We offer single and dual output models with dual and triple grating mounts. All are F/3.9 instruments with a flat, 28 mm image plane for multichannel detectors. Stray light is negligible, re-entrant spectra are eliminated, throughput is high, and spatial and spectral resolution are impressive. And, they are now offered with USB 2.0 interfaces. RS-232 and IEEE-488 interfaces are also still available.

Why The MS260i?
The MS260i™ Spectrographs are an economical alternative to our fully featured, 1/4 m Monochromator and Imaging Spectrograph. To keep costs down, we removed some of the features from the MS257™, without compromising performance. The result is a family of instruments with very good spatial and spectral resolution. The dual grating instrument offers improved resolution, over the triple grating instrument. Spatial resolution is 40 µm for the dual grating model, compared to 50 µm for the triple grating version. The grating mounts are interchangeable, so if you currently have a triple grating MS260i™, you can easily convert it to a dual grating instrument. Simply choose two "Dual Grating Assemblies". These assemblies mount directly to the turret in your MS260i™.

Optical Configuration
A set of computer optimized toroidal mirrors produce accurate images of the input slit in the flat output plane. The superior spatial resolution of the MS260i sets it apart from most other imaging spectrographs; the aberration limited spatial resolution is 40 µm (FWHM), for the dual grating instrument.

Designed for Multi-track Spectroscopy
Multi-track Spectroscopy is the simultaneous recording of multiple spectra. One of the factors limiting the number of spectra which can be recorded simultaneously is the spectrograph’s magnification. MS260i™ uses toroidal mirrors instead of the more common but poorly imaging spherical mirrors. The result is a 1.1 horizontal and 1.6 vertical magnification. It is important to note here that both the dual grating and the triple grating MS260i™ Spectrographs have the same magnifications, and can therefore resolve the same number of tracks from Multi-track Fiber Bundles. However, the image quality from a dual grating MS260i™ is superior to that from a triple grating instrument.

Dual Output Ports
We offer single and dual output port MS260i Imaging Spectrographs. The dual output port instruments give you added versatility without compromise in performance; you can mount a silicon array on one port and an InGaAs array on the other, for extended wavelength measurements. These have a motorized flip mirror to switch between ports; the flip mirror can be controlled via the 74009 Hand Controller or MS260i Command Set.

Stray Light
One of the design criteria for MS260i was to mimimize stray light. It is important that diffracted light not be allowed to reflect from the mirrors, or from the face of a focal plane detector, back onto the grating. This light could then be rediffracted and cause ghost images or stray light at the detector. The wide open optical layout and exaggerated tilt of the exit focal plane of the MS260i ensure that there is zero re-entrant spectra.