VPH Transmission Gratings: High Efficiency & Design Flexibility

21 Apr 2022

Each Wasatch Photonics volume phase holographic (VPH) grating produced is an original, with consistent performance from one grating to the next. Our proprietary processes minimize stress, resulting in low wavefront distortion, and our stringent adherence to quality ensures minimal scatter.

By imaging the grating holographically, we retain tremendous flexibility in design as well as precise parameter control, allowing us to generate very high quality, highly custom diffraction gratings in volumes of 1 or 1000 pieces. The finished grating is sealed between two optical windows, resulting in a rugged, scratch-resistant product that can be easily handled and cleaned. Learn more about the advantages of VPH gratings

We offer more design technologies

• Standard/enhanced gratings: Optimized for s-, p-, or average polarization. We can design gratings with >94% measured efficiency across the full operating band for pulse compression.
• Dickson gratings: Highly efficiency in both s- and p-pol over a 20-60 nm bandwidth. These designs can be angle tuned for astronomy, and fabricated in large dimensions. We are the original patent holders! You may find our gratings in astronomical telescopes, OCT diagnostic instruments, and handheld Raman scanners.
• HD gratings: We developed and patented this design to provide high efficiency and low polarization dependency over 200+ nm bandwidths. We are the only provide of HD VPH gratings, serving the Raman spectroscopy and OCT markets in both research and industry.

Defining the design parameters

Once the ideal design technology has been chosen for a given application, our R&D team works with you to further optimize the design parameters for your specific research or OEM product needs, drawing on experience with a wide variety of projects over 2 decades:

• Wavelength: 300 nm to 2500 nm, narrowband or broadband
• Polarization: single polarization (s- or p-), or unpolarized light
• Dispersion: spatial frequencies up to 4000 lines/mm
• Angle of Incidence: options for desired operation & diffraction angle
• Grating size: 25 or 50 mm diameter standard, as well as square and rectangular gratings for pulse compression, spectroscopy, and astronomy. Sizes as small as 10×10 mm in volume, and up to 300 mm in dimension for astronomy, large imaging arrays, and hyperspectral spectrographs.
• Substrates: a wide variety of substrate types, from 1 mm to up to 25 mm thick for large format astronomy gratings.
• Custom geometries: grisms (grating-prism hybrid) and other

Full design control, expert advice

We understand the performance tradeoffs to be considered for a wide range of applications, from pulse compression, spectroscopy, and imaging to OCT, lidar, and telecommunications. Contact us to discuss your needs today.