VPH Hyperspectral Imaging Transmission Gratings

Enabling compact, broad bandwidth, diffraction-limited optical designs
Courtesy of European Space Agency

Gold Standard Gratings for Hyperspectral Imaging

High efficiency, low abberations

Since transmissive VPH gratings offer the optical designer many advantages, VPH gratings are widely considered the gold standard for high-performance hyperspectral imaging (HSI) systems, particularly for industrial and remote sensing applications.

Wasatch VPH gratings are more efficient and scatter much less than reflective ruled gratings whilst being more robust to handling vs surface relief gratings. Thereby enabling HSI instruments that are smaller in size, with lower aberration and easier to align. Online shop gratings are available or you can choose to collaborate with our expert team on OEM designs from 300–2500 nm.

Features & Benefits

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    Exceptional first-order diffraction efficiency for greater sensitivity and faster imaging rates
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    Patented broad-bandwidth grating designs
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    Near-zero ghosting and scatter for reduced stray light
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    Low wavefront error for clearer images
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    Robust design for easy cleaning and handling
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    NIR imaging capability up to 2500 nm

Wasatch Photonics VPH gratings deliver superior efficiency and low-scatter performance for high-precision transmissive spectroscopy.

Typical Hyperspectral Imaging Grating Specifications

WP-250/1250-xx

WP-600/600-xx

WP-1800/532-xx

WP-600/1550-xx

Nominal Wavelength

900–1800 nm

450–750 nm

450–650 nm

1300–1800 nm

Efficiency (ave pol)
≥ 70% at 1310 nm

≥ 80% at 633 nm

≥ 88% at 532 nm
≥ 90% at 1550 nm
Spatial Frequency
250 ± 0.5 lines/mm
600 ± 0.5 lines/mm
600 ± 0.5 lines/mm

600 ± 0.5 lines/mm

Angle of Incidence

9° @ 1250 nm

10.4° @ 600 nm
28.6° @ 532 nm
27.7° @ 1550 nm
Sizes Available (-xx)
30 mm Ø x 3.0 mm
25.4 mm Ø x 3.0 mm
50.8 mm Ø x 6.0 mm
25.4 mm Ø x 3.0 mm
50.8 mm Ø x 6.0 mm

25.4 mm Ø x 3.0 mm
50.8 mm Ø x 6.0 mm

Wavefront Distortion
Standard: < λ/5 rms | Enhanced: < λ/10 rms (@ 632.8 nm)
Surface Quality

60–40 scratch-dig

AR Coating

Standard: R < 1.0% | Enhanced: R < 0.5% (over bandwidth)

Design Graphs

Misty Johnson

Misty Johnson is responsible for taking care of our grating customers at the Logan, Utah, facility. She has been a member of the Wasatch Photonics team since 2009. By understanding her customers’ needs and goals, as well as the current grating market, Misty is able to provide a superior level of customer support. As Account Manager, she acts as a liaison between customers and Wasatch Photonics’ manufacturing department making sure that the lines of communication are always open.

Customer support is an integral part of Wasatch Photonics commitment to customers. Whether you are in the market to purchase a single grating, inquiring as a distributor, or purchasing large volume, Misty will guide you seamlessly through the custom design process. Misty strives to build trust and strong long term relationships with Wasatch Photonics customers. She brings 20 years’ experience as customer support manager from a number of manufacturing and service companies.