Transmission Grating

Transmission Grating

UV, VIS and IR Transmission Diffraction Gratings

A transmission grating offers a basic simplicity for optical designs that can be beneficial in fixed grating applications such as spectrographs (aka optical spectrometer). The incident light is dispersed on the opposite side of the grating at a fixed angle. Transmission gratings are very forgiving for certain types of grating alignment errors.

By necessity, a transmission grating requires relatively coarse groove spacings to maintain high efficiency. As the diffraction angles increase with finer spacing, the refractive properties of the materials used limit the transmission at the higher wavelengths and performance drops off. The grating dispersion characteristics, however, lend themselves to compact systems utilizing small detector arrays. The gratings are also relatively polarization insensitive.

This line of blazed transmission gratings was designed for optimum performance in the visible and NIR spectrum, offering different levels of dispersion. In most cases, the efficiency is comparable to that of reflection gratings typically used in the same region of the spectrum.  Zero order data is included in all performance curves for those interested in beam splitting applications.

UV Transmission Gratings are produced on fused silica substrates providing superior diffraction efficiencies as low as 235 nm. Zero order data is included in all performance curves for those interested in beam splitting applications.

An AR coating can be applied to the non diffracting surface of our visible Transmission gratings which increase diffraction efficiencies by reducing first surface reflection losses. Our standard AR coatings are designed to increase efficiency of the grating in the 400-800nm range. Please contact Optometrics for other spectral ranges.

Optometrics develops hybrid grating and optical filter for holographic weapons sight.

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  • 1200 Groove, UV Transmission Grating, 12.5 X 25 mm, 2 mm Thick

    Transmission Grating Specifications | G1200TU26.7QB

    Grooves Per mm

    1200

    Groove Angle

    26.74°

    Substrate

    Fused Silica

    Size (mm)

    12.5 X 25 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 1200 Groove, UV Transmission Grating, 12.5 X 25 mm, 2 mm Thick

    Transmission Grating Specifications | G1200TU36.9QB

    Grooves Per mm

    1200

    Groove Angle

    36.87°

    Substrate

    Fused Silica

    Size (mm)

    12.5 X 25 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 1200 Groove, UV Transmission Grating, 25 X 50 mm, 2 mm Thick

    Transmission Grating Specifications | G1200TU26.7TB

    Grooves Per mm

    1200

    Groove Angle

    26.74°

    Substrate

    Fused Silica

    Size (mm)

    25 X 50 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 1200 Groove, UV Transmission Grating, 25 X 50 mm, 2 mm Thick

    Transmission Grating Specifications | G1200TU36.9TB

    Grooves Per mm

    1200

    Groove Angle

    36.87°

    Substrate

    Fused Silica

    Size (mm)

    25 X 50 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 1200 Groove, VIS Transmission Grating, 12.5 X 25 mm, 3 mm Thick

    Transmission Grating Specifications | G1200TV36.9QCM

    Grooves Per mm

    1200

    Groove Angle

    36.87°

    Substrate

    AR Coated B-270

    Size (mm)

    12.5 X 25 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 1200 Groove, VIS Transmission Grating, 25 X 50 mm, 3 mm Thick

    Transmission Grating Specifications | G1200TV36.9TC

    Grooves Per mm

    1200

    Groove Angle

    36.87°

    Substrate

    B-270

    Size (mm)

    25 X 50 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 1200 Groove, VIS Transmission Grating, 25 X 50 mm, 3 mm Thick

    Transmission Grating Specifications | G1200TV36.9TCM

    Grooves Per mm

    1200

    Groove Angle

    36.87°

    Substrate

    AR Coated B-270

    Size (mm)

    25 X 50 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Optical Coating

    MgF2

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 300 Groove, NIR Transmission Grating, 12.5 X 25 mm, 3 mm Thick

    Transmission Grating Specifications | G300TN24.8QC

    Grooves Per mm

    300

    Groove Angle

    24.84°

    Substrate

    B-270

    Size (mm)

    12.5 X 25 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 300 Groove, NIR Transmission Grating, 12.5 X 25 mm, 3 mm Thick

    Transmission Grating Specifications | G300TN31.7QC

    Grooves Per mm

    300

    Groove Angle

    31.67°

    Substrate

    B-270

    Size (mm)

    12.5 X 25 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²

  • 300 Groove, NIR Transmission Grating, 25 X 50 mm, 3 mm Thick

    Transmission Grating Specifications | G300TN24.8TC

    Grooves Per mm

    300

    Groove Angle

    24.84°

    Substrate

    B-270

    Size (mm)

    25 X 50 mm

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    Grooves Parallel

    Short

    Scratch/Dig

    60-40

    Clear Aperture

    90%

    Edge Angle

    90° ±0.50°

    Perpendicularity

    90° ±0.50°

    Operating Temperature Range

    -50° C to +125° C

    Damage Threshold: Pulsed

    350 mJ /cm², 200 nano sec. pulse

    Damage Threshold: CW laser

    40 watts/cm²