Omni-λ300Di / Omni-λ500Di / Omni-λ180Di double monochromator / spectrograph
WaveQuanta

Omni-λ180Di, 300Di, 500Di Double Monochromators, Stray Light to 1×10⁻⁹

Omni-λ300Di / Omni-λ500Di / Omni-λ180Di
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Double monochromators for very low stray light (subtractive mode) or higher resolution (additive mode).

These double monochromators/spectrographs combine two finely aligned monochromators in one housing. In subtractive dispersion mode they reduce stray light for weak-signal work such as Raman spectroscopy; in additive mode the dispersion is doubled for high-resolution measurements. The Omni-λ300Di and Omni-λ500Di support both modes, while the Omni-λ180Di is a dedicated subtractive double monochromator.

Key Features

  • Omni-λ300Di and Omni-λ500Di operate in either additive or subtractive dispersion mode
  • Stray light 1 × 10⁻⁹ in subtractive mode and 1 × 10⁻⁷ in additive mode
  • Additive mode doubles the focal length to 640 mm (300Di) or 1000 mm (500Di) for 0.04 nm or 0.025 nm resolution
  • Triple grating turret with 68 × 68 mm gratings spanning UV to NIR
  • Motorized or manual slits from 0.01 to 3 mm, plus a 24 mm wide motorized middle slit
  • All-in-one housing for easy transport and installation; USB 2.0 software control
  • Omni-λ180Di: subtractive double monochromator with stray light below 10⁻⁹ for UV–VIS–NIR work

Typical Applications

  • Low-wavenumber Raman spectroscopy (laser line rejection)
  • Tunable monochromatic light sources with broadband lamps
  • Detector spectral responsivity calibration, especially in the UV
  • High-resolution spectral measurements
  • Weak-signal detection requiring low stray light

Model Overview

Model Mode Focal Length (mm) Aperture Resolution (nm) Dispersion (nm/mm) Stray Light Size (mm)
Omni-λ300Di Additive 640 F/4.2 0.04 1.15 1×10⁻⁷ 825 × 500 × 281
Omni-λ300Di Subtractive 320 F/4.2 0.08 2.29 1×10⁻⁹ 825 × 500 × 281
Omni-λ500Di Additive 1000 F/6.5 0.025 0.75 1×10⁻⁷ 825 × 600 × 281
Omni-λ500Di Subtractive 500 F/6.5 0.05 1.49 1×10⁻⁹ 825 × 600 × 281
Omni-λ180Di Subtractive – – – – below 10⁻⁹ –

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Models: Omni-λ180Di, Omni-λ300Di, Omni-λ500Di · Contact WaveQuanta for a quote, configuration advice and lead time.

Configuration Two monochromators in one housing, additive or subtractive dispersion
Wavelength Accuracy ±0.2 nm (300Di, 500Di)
Wavelength Repeatability ±0.025 nm (300Di, 500Di)
Step 0.005 nm (300Di, 500Di)
Optical Axis Height 146 mm (300Di, 500Di)
Grating Size 68 × 68 mm (300Di, 500Di)
Grating Mount Triple grating turret (300Di, 500Di)
Slit Width 0.01–3 mm, motorized or manual
Slit Height 2, 4 or 14 mm, selectable
Middle Slit 24 mm wide, motorized (300Di, 500Di)
Interface USB 2.0, software controlled
Spectral Coverage UV–VIS–NIR (grating dependent)
Omni-λ180Di Subtractive mode, stray light below 10⁻⁹, USB 2.0, all-in-one design
Test Conditions 1200 g/mm @ 435.8 nm; resolution with 10 µm slit width and 4 mm slit height
Specification Sheet PDF — Download
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Omni-λ300Di / Omni-λ500Di / Omni-λ180Di double monochromator / spectrograph
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Product Family: Monochromators & Spectrographs (5 variants)

Product ▴▾ SKU Size ▴▾ Clear Aperture ▴▾ Operating Wavelength ▴▾
Omni-λ180Di, 300Di, 500Di Double Monochromators, Stray Light to 1×10⁻⁹ Current Omni-λ300Di / Omni-λ500Di / Omni-λ180Di — — —
Omni-iSpecT VPH Raman Spectrograph, F/2.3, 532 nm and 785 nm Versions Omni-iSpecT — — —Contact
Triple Monochromator for Raman, Subtractive and Additive Dispersion Stages Triple Monochromator — — —Contact
HiperS-320i Aberration-Free Imaging Spectrometer, 320 mm, On-Axis Turret HiperS-320i — — —Contact
Omni-λ Series Monochromators and Spectrographs, 200–750 mm Focal Length Omni-λ Series — — —Contact