Transmission Gratings with AR Coating, UV, VIS, NIR

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Optometrics

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.

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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.

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.

AR Coating

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.

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Product SKUs

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

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

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

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Efficiency Curve

G300TN31.7MC
$203.00
Available on backorder
300 Groove, NIR Transmission Grating, 50 mm Sq., 3 mm Thick quantity
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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

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

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

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

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

Transmission Grating Specifications | G300TV17.5CCM

Optical Coating	MgF2	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
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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