Search Menu
Photonics Media Photonics Marketplace Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook

Richardson Provides Grating for Discovery Channel Telescope

Facebook Twitter LinkedIn Email Comments
Richardson Gratings is providing a large mosaic echelle grating for the Extreme Precision Spectrometer (EXPRES), an instrument for the 4.3-m Discovery Channel Telescope outside Flagstaff, Ariz.

The telescope is designed to detect Earth-like planets as part of Yale University's 100 Earths Project. Researchers aim to search nearby stars for rocky plants on which liquid water may exist, locating areas suitable for life.

The grating was fabricated as a monolithic aluminum-coated replica from two matched gratings on the same echelle master. It has 31.6 grooves per millimeter with a nominal blaze angle of 75°.

The peak unpolarized diffraction efficiency meets or exceeds 60 percent for diffracted orders peaking between 400 and 700 nm. Spectral resolving power was measured to exceed 600,000 at 633 nm, with spatial resolution better than 4 arcsec. The overall diffracted wavefront demonstrates irregularity from a plane wavefront of less than 0.1 waves at 633 nm.

Founded in 1947, Richardson Gratings designs and manufactures standard and custom diffraction gratings for use in analytical instrumentation, lasers and tunable light sources, fiber-optic telecommunications networks and photolithographic systems, as well as for researchers, astronomers and educators. It is part of Newport Corp.

Photonics Spectra
Feb 2016
The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.
BusinessAmericasNew YorkRochesterRichardson Gratingsopticsastronomylight speed

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2020 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, [email protected]

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.