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Concave Gratings for Monochromators

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Aberration-corrected concave imaging holographic gratings are the key elements in the design of outstanding, high-performance optical benches, spectrometers and monochromators for critical applications that require high-throughput and best optical purity for applications such as Fluorescence, Absorbance or light source tuning and wavelength selection.

The concave grating does it all: Both the dispersion & diffraction of the light, and the imaging & focusing onto the detector, without the need for additional optics. The simple design guarantees a robust assembly between input, grating and detector, with superb thermal stability, essential for devices used in industrial environments.

Careful design of the gratings at time of conception, precise holographic recording of the master and controlled replication processes in pristine laboratory environment guarantee an optical component that will deliver the best signal purity at the highest throughput possible, consistently, grating after grating, years after years.

Aberration-corrected concave gratings for monochromators are designed to work as scanning devices, between a fixed input and a fixed output. They are used in single and dual-monochromator layouts for scanning of the Excitation and Emission signals in a Fluorescence instrument, or to scan a specific wavelength in an Absorbance setup, or to select a specific band of light when matched to a broadband light source.

Contact our Spectroscopy Team at tec5USA to discuss your project in full confidentiality. We will assist you in identifying the best grating and monochromator solutions, or work to define a Custom grating design, specific to your requirements, geometrical layout, and exclusive to your needs.

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  • Maximum throughput and signal collection between signal input and sensor output.
    No astigmatism with excellent correction of the aberrations, ensuring optimal focusing of the photons onto the sensor or output port (e.g. optical fiber).
  • High efficiency gratings thanks to blazing and ion-etching processes, with a major improvement in SNR performance.
    Superior throughput compared to traditional pseudo-sinusoidal gratings.
  • Ultra-low stray light contribution thanks to thorough and careful controls at every step of the process, from master grating design and holographic recording to high-volume replication.


  • High throughput, simplified monochromator design with only one optical component required.
    Concave gratings deliver both diffraction and focusing onto the sensor or output port without any additional optics.
  • Used for compact, cost-efficient monochromator scanning bench, with smaller layout compared to more traditional Czerny-Turner platforms with extra mirrors.
  • Unsurpassed stray light rejection performance over traditional scanning benches such as Czerny-Turner or Fastie-Ebert.
    The solution of choice for demanding applications like UV-VIS Absorbance, Excitation-Emission Fluorescence or Metrology.
  • Available as grating only, or as a component of a pre-aligned opto-mechanical sub-assembly for cost-efficient OEM integration.


  • Diameter From ≤Ø25 mm to ≥Ø60 mm
  • Focal length From ≤70 mm to ≥220 mm
  • Groove density From ≤400 to ≥2,000 gr/mm
  • Dispersion From ≤2 nm/mm to ≥25 nm/mm
  • Substrate N-BK7, N-ZK7, Fused Silica, Zerodur, etc…
  • Coating Aluminum, Gold, etc.
  • Relative efficiency Up to 80+% thanks to blazing and ion-etching
  • Spectral range UV, UV-VIS, UV-NIR, VIS-NIR, NIR

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