Transmission Gratings

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 - UV

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

 

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.

General Specifications
Substrate material - Schott B270
Thickness - 3mm nominal
Dimensional tolerances - 0.5mm
Thickness tolerances - 0.5mm

 

 

Transmission Gratings - Visible
Size (mm) 12.7 x 12.7 12.7 x 12.7 (AR) 25 x 25 25 x 25 (AR) 30 x 30 30 x 30 (AR) 50 x 50 50 x 50 (AR) 12.5 x 25 12.5 x 25 (AR) 25 x 25 25 x 25 (AR)
Groove Spacing / Blaze Angle
300 g/mm  17.5° 3-9801 3-9901 3-9802 3-9902 3-9803 3-9903 3-9804 3-9904 3-9805 3-9905 3-9806 3-9906
600 g/mm 28.7° (VIS) 3-9807 3-9907 3-9808 3-9908 3-9809 3-9909 3-9810 3-9910 3-9811 3-9911 3-9812 3-9912
600 g/mm 22° (VIS) 3-9813 3-9913 3-9814 3-9914 3-9815 3-9915 3-9816 3-9916 3-9817 3-9917 3-9818 3-9918
830 g/mm 29.87° 3-9819 3-9919 3-9820 3-9920 3-9821 3-9921 3-9822 3-9922 3-9823 3-9923 3-9824 3-9924
1200 g/mm 36.9° 3-9825 3-9925 3-9826 3-9926 3-9827 3-9927 3-9828 3-9928 3-9829 3-9929 3-9830 3-9930

PRICE ($) *

59.00 79.00 89.00 119.00 99.00 129.00 165.00 195.00 69.00 89.00 129.00 159.00

 

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

 

 

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.

 

General Specifications
Material - Schott B270
Size - 25 mm square maximum
Thickness - 3 mm nominal
Tolerances - ± 0.5 mm


 

 

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

Transmission Grating Beamsplitters
He-Ne DIFFRACTED ORDER
TYPICAL DISTRIBUTION @ 632.8 nm (%)
12.7 x 12.7 mm CATALOG NO. PRICE ($) 25 x 25 mm CATALOG NO. PRICE ($)
L/MM -2 -1 0 +1 +2        
70 - - 41 32 - 4-1270 109.00 4-2570 229.00
80 5 25 25 25 5 4-1280 109.00 4-2580 229.00
92 - 20 45 20 - 4-1292 109.00 4-2592 229.00
110 - 25 28 25 - 4-1211 109.00 4-2511 229.00

 

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