New line of replicated gratings, specifically designed for use in transmission...

Transmission gratings offer 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, transmission gratings require 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.

Transmission Gratings - NIR
Size (mm)	12.7 x 12.7	25 x 25	30 x 30	50 x 50	12.5 x 25	25 x 50
Groove Spacing / Blaze Angle
300 g/mm  31.7°	3-9201	3-9202	3-9203	3-9204	3-9205	3-9206
300 g/mm  24.8°	3-9207	3-9208	3-9209	3-9210	3-9211	3-9212
PRICE ($) *	59.00	89.00	99.00	165.00	69.00	129.00

 

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Transmission Gratings - UV

New UV Transmission Gratings are available in standard sizes. They are manufactured with carefully selected UV materials allowing for optimal performance down to 235 nm. Zero order data is included in all performance curves for those interested in beam splitting applications.

General Specifications
Substrate material	-	UV grade fused silica
Thickness	-	2mm nominal
Dimensional tolerances	-	± 0.5mm
Thickness tolerances	-	± 0.2mm

 

Transmission Gratings - UV
Size (mm)	12.7 x 12.7	25 x 25	30 x 30	50 x 50	12.5 x 25	25 x 50
300 g/mm  8.6°	3-9401	3-9402	3-9403	3-9404	3-9405	3-9406
600 g/mm  22°	3-9411	3-9412	3-9413	3-9414	3-9415	3-9416
600 g/mm  17.5°	3-9421	3-9422	3-9423	3-9424	3-9425	3-9426
800 g/mm  19.4°	3-9431	3-9432	3-9433	3-9434	3-9435	3-9436
1200 g/mm  36.9°	3-9441	3-9442	3-9443	3-9444	3-9445	3-9446
1200 g/mm  26.7°	3-9451	3-9452	3-9453	3-9454	3-9455	3-9456
PRICE ($) *	65.00	95.00	115.00	199.00	75.00	149.00

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Transmission Grating Beamsplitters

Transmission grating beamsplitters are commonly used for laser beam division and multiple laser line separation in visible wavelengths. The transmitted beam is diffracted into multiple orders.

Optometrics transmission grating beamsplitters consist of an index matched epoxy replica on a polished glass substrate for a high total efficiency. These beamsplitters were designed specifically for useful division of He-Ne lasers.

Several gratings are available offering different dispersion and power distributions. The diffraction angle for any wavelength may be calculated using the grating equation for normal incident light.

Used for He-Ne laser beam division and multiple laser line separation in visible wavelengths, the transmitted beam is diffracted into multiple orders.

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