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SWIR Bandpass Filters

Self-blocking SWIR Bandpass Filters for Spectral Sensing and Imaging

Materion Balzers Optics SWIR bandpass filters stand out by their unique self-blocking filter design, combining wide blocking and high passband transmittance in a single all-dielectric interference coating. All filters are deposited by plasma-assisted processes and show extreme stability in terrestrial and space environments. They can be completed with our broad band dichroic beamsplitters.

Self-blocking SWIR Bandpass Filters for Spectral Sensing and Imaging

Benefits

Self-blocking filter design with blocking range over full detector response
High transmittance in passband
Long-term shift-free spectral performance
Excellent environmental stability

Applications

Spectral sensing and imaging with InGaAs or HgCdTe (MCT) detectors
NIR Raman spectroscopy
Plasma diagnostics and Emission spectroscopy
Fiber Optics Transmission measurements
Global remote sensing
Atmospheric greenhouse gas monitoring

Technical Data

Passband wavelength

Custom-made

Blocking

1100 to 2100 (2700) nm, OD3 or better
(depending on requirements)

Transmittance

> 85% outside blockband

Angle of Incidence

Standard 0°, different AOI on request

Substrate Material

Fused silica, BK7 or BK7G18 (radiation resistant)

Dimensions

Standard size Ø 25 mm, thickness up to 3 mm,
other dimensions on request

Parallelism

< 3 arcmin

Surface Defects

5/3 x 0.16

Environmental Stability

Temperature –100 °C to +300°C
Gamma and proton radiation
Elevated humidity
Hard, all-dielectric coatings

Self Blocking Filter Coating

Fig. 1: Design spectral transmittance, passband

Fig. 1: Design spectral transmittance, passband

Fig. 2: Measured log spectral response (inte-grated blocking band response 0.42%)

Fig. 2: Measured log spectral response (inte-grated blocking band response 0.42%)

Fig. 3: Measured spectral characteristics of BP1610 and BP2190, measured CWL 1611.1 and 2190.9nm (expected design CWL 1610/2190nm)

Fig. 3: Measured spectral characteristics of BP1610 and BP2190, measured CWL 1611.1 and 2190.9nm (expected design CWL 1610/2190nm)

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