Transmission Gratings

Transmission Gratings

A transmission grating offers a basic simplicity for optical designs that can be beneficial in fixed grating applications such as spectrographs. The incident light is dispersed on the opposite side of the grating at a fixed angle. Transmission gratings are very forgiving for some 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 the finer spacings, 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.

Transmission Gratings: Visible & NIR

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.

Transmission Gratings: UV

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.

Anti-reflective Coatings

Anti-reflective coatings 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. Other anti-reflection coating spectral ranges are available, contact Optometrics to discuss your specific needs.

Product SKUs

  • 300 Groove, NIR Transmission Grating, 30 mm Sq., 3 mm Thick

    Efficiency Curve
    300/24.8 Degree Tx Grating
    G300TN24.8JC
    $139.00
    2 in stock
    Add to cart

    Transmission Grating Specifications | G300TN24.8JC

    Grooves Per mm

    300

    Groove Angle

    24.84°

    Substrate

    B-270

    Size (mm)

    30 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    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, 30 mm Sq., 3 mm Thick

    Efficiency Curve
    300/31.7 Degree Tx Grating
    G300TN31.7JC
    $139.00
    1 in stock
    Add to cart

    Transmission Grating Specifications | G300TN31.7JC

    Grooves Per mm

    300

    Groove Angle

    31.67°

    Substrate

    B-270

    Size (mm)

    30 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    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, 50 mm Sq., 3 mm Thick

    Efficiency Curve
    300/24.8 Degree Tx Grating
    G300TN24.8MC
    $203.00
    2 in stock
    Add to cart

    Transmission Grating Specifications | G300TN24.8MC

    Grooves Per mm

    300

    Groove Angle

    24.84°

    Substrate

    B-270

    Size (mm)

    50 mm sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    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, 50 mm Sq., 3 mm Thick

    Efficiency Curve
    300/31.7 Degree Tx Grating
    G300TN31.7MC
    $203.00
    2 in stock
    Add to cart
  • 300 Groove, UV Transmission Grating, 12.7 mm Sq., 2 mm Thick

    Efficiency Curve
    300/8.6 Degree UVTx Grating
    G300TU8.6CB
    $83.00
    5 in stock
    Add to cart

    Transmission Grating Specifications | G300TU8.6CB

    Grooves Per mm

    300

    Groove Angle

    8.63°

    Substrate

    Fused Silica

    Size (mm)

    12.7 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    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, UV Transmission Grating, 25 mm Sq., 2 mm Thick

    Efficiency Curve
    300/8.6 Degree UVTx Grating
    G300TU8.6GB
    $138.00
    5 in stock
    Add to cart

    Transmission Grating Specifications | G300TU8.6GB

    Grooves Per mm

    300

    Groove Angle

    8.63°

    Substrate

    Fused Silica

    Size (mm)

    25 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    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, UV Transmission Grating, 30 mm Sq., 2 mm Thick

    Efficiency Curve
    300/8.6 Degree UVTx Grating
    G300TU8.6JB
    $169.00
    3 in stock
    Add to cart

    Transmission Grating Specifications | G300TU8.6JB

    Grooves Per mm

    300

    Groove Angle

    8.63°

    Substrate

    Fused Silica

    Size (mm)

    30 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    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, UV Transmission Grating, 50 mm Sq., 2 mm Thick

    Efficiency Curve
    300/8.6 Degree UVTx Grating
    G300TU8.6MB
    $287.00
    Available on backorder
    Add to cart

    Transmission Grating Specifications | G300TU8.6MB

    Grooves Per mm

    300

    Groove Angle

    8.63°

    Substrate

    Fused Silica

    Size (mm)

    50 mm sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    2 mm

    Thickness Tolerance

    ±0.5 mm

    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, VIS Transmission Grating, 12.7 mm Sq., 3 mm Thick

    Efficiency Curve
    300/17.5 Degree Tx Grating
    G300TV17.5CC
    $67.00
    Available on backorder
    Add to cart

    Transmission Grating Specifications | G300TV17.5CC

    Grooves Per mm

    300

    Groove Angle

    17.46°

    Substrate

    B-270

    Size (mm)

    12.7 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    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, VIS Transmission Grating, 12.7 mm Sq., 3 mm Thick

    Efficiency Curve
    Performance Comparison Various Tx Gratings
    G300TV17.5CCM
    $83.00
    9 in stock
    Add to cart

    Transmission Grating Specifications | G300TV17.5CCM

    Grooves Per mm

    300

    Groove Angle

    17.46°

    Substrate

    AR Coated B-270

    Size (mm)

    12.7 mm Sq.

    Size Tolerance

    ±0.5 mm

    Thickness

    3 mm

    Thickness Tolerance

    ±0.5 mm

    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

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