PGS Family

The NIR Specialists

PGS Family

Plane grating spectrometer

  • Introduction

    The plane grating spectrometers are designed for application in the NIR range for specific measuring tasks. These compact and robust modules measure even thick layers with stable wavelength high resolution and the highest precision, even under extreme process conditions. InGaAs (indium-gallium-arsenide) is used as a detector material. The special combination of aspheric collimator and a focusing lens maintain a good, flat field correction of the spectral imaging.

    Components of the PGS family

    • Blazed plane gratings
    • Aspheric lenses
    • Mono-fiber with slit as optical input
    • Cooled InGaAs photodiode array as opto-electronic output
    • Interfaces, processing software and support
  • Highlights

    Benefits

    • Compact without movable parts
    • Permanently aligned
    • Robust even in harsh environments
    • Fast and simultaneous read-out
    • Permanently calibrated
    • High dynamic range
    • High light sensitivity
    • High reproducibility
    • Low temperature drift
  • Design
    • Central body made of aluminum alloy
    • Input fiber and detector are permanently connected to central body, providing excellent stability
    • Mechanically ruled or holographical exposed plane gratings 
    • The grating surface is designed capture the light of a fiber with NA of up to 0.37
  • Video
  • Specification
      PGS 1.7 - 256   PGS 1.7 - 512 PGS 2.0 - 256  PGS 2.2 - 256 
    Optical entrance Infrasil-quartz glass  Diameter: 0.6 mm Infrasil-quartz glass  Diameter: 0.6 mm Infrasil-quartz glass  Diameter: 0.6 mm Infrasil-quartz glass  Diameter: 0.6 mm
    Input round Length: 300 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling Length: 300 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling Length: 300 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling Length: 300 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling
    Output linear Slit width: 80 µm  Slit width: 80 µm  Slit width: 80 µm  Slit width: 80 µm 
    Edge Filter 950 nm 950 nm 1,350 nm 950 nm
    Gratings Plane grating,
        484 l / mm, blazed for approx. 1.2 µm    		 Plane grating,
        484 l / mm, blazed for approx. 1.2 µm    		 Plane grating,
        484 l / mm, blazed for approx. 1.4 µm    		 Plane grating,
        300 l / mm, blazed for approx. 1.4 µm
    Diode array Hamamatsu S9203-256, 256 pixel Sensor Unlimited Inc. SU512LD-1.7 T1, 512 pixel   Hamamatsu G9206, 256 pixel Hamamatsu G9206, 256 pixel
    Spectral range 960-1,690 nm 960-1,690 nm 1,340-2,000 nm 1,000-2,150 nm
    Wavelength accuracy 1 nm 1 nm 1 nm 1 nm
    Temperature induced drift < 0.012 nm/K < 0.012 nm/K < 0.012 nm/K < 0.012 nm/K
    Mean spectral pixel pitch Δ λ pixel ≈ 3 nm Δ λ pixel ≈ 1.5 nm Δ λ pixel ≈ 3 nm Δ λ pixel ≈ 5 nm
    Resolution Δ λ FWHM ≈ 8 nm  Δ λ FWHM ≈ 6 nm  Δ λ FWHM ≈ 8 nm  Δ λ FWHM ≈ 16 nm 
    Stray light ≤ 0.1 % as transmission of 10 mm water at 1,405 nm (exposure from halogen lamp)  ≤ 0.1 % as transmission of 10 mm water at 1,405 nm (exposure from halogen lamp)  ≤ 0.1 % as transmission of 10 mm water at 1,405 nm (exposure from halogen lamp)  ≤ 0.1 % as transmission of 10 mm water at 1,405 nm (exposure from halogen lamp) 
    Operating temperature 0-40 °C (standard, depending on cooling electronic)  0-40 °C (standard, depending on cooling electronic)  0-40 °C (standard, depending on cooling electronic)  0-40 °C (standard, depending on cooling electronic) 
    Minimal bending radius of fiber for storage and transport
    		 50 mm 50 mm 50 mm 50 mm
    Minimal bending radius in operation (for  wavelength accuracy) 100mm 100mm 100mm 100mm
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    PGS NIR

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