PGS

The spectrometers of the PGS family are designed for use in the NIR. InGaAs (indium-galliumarsenide) is used as a detector material in this wavelength range. The special combination of aspheric collimator and focusing lens allows the use of plane gratings optimized for the NIR, while maintaining good flat field correction of the spectral imaging.

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Product Info

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

benefits

design

specifications

	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)	100 mm	100 mm	100 mm	100 mm

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