Design & Modeling

PGL employs sophisticated, state-of-the-art design tools for modeling diffraction grating and thin-film coating performance. These are vital not only for determining initial designs, but also for considering manufacturing tolerances which drive costs as well as for aiding the manufacturing process itself.

Well-established commercial design packages like OptiLayer™ for thin-film coating design and GSolver™ for grating design are used. PGL has also developed its own custom grating design software for maximum flexibility and speed. This software enables complex grating profiles to be modeled in a straightforward way, incorporating calculations of phase, polarization, and electric field enhancement. It is also capable of modeling two-dimensional (2D) gratings.

The example to the right shows how diffraction efficiency (DE) and normalized electric-field squared for an MLD grating depend on certain grating parameters (like depth and duty cycle) as well as use parameters (like wavelength and angle of incidence).

DE vs. Depth and Duty Cycle
(Wavelength = 1053 nm; AOI = 77.2º)

DE vs. Wavelength and AOI
(Depth = 460 nm; DC = 40%)

Max |E|2 vs. Depth and Duty Cycle
(Wavelength = 1053 nm; AOI = 77.2º)

Max |E|2 in the Grating
(Depth = 460 nm; DC = 40%)

Plymouth Grating Laboratory is dedicated to making the highest-quality diffraction gratings available today. Our focus is on lasers and laser systems. PGL gratings offer exceptionally high diffraction efficiency and laser damage threshold, combined with superior wavefront error and uniformity over large areas. This performance is made possible by PGL’s exclusive use of the Nanoruler, based on the proprietary Scanning Beam Interference Lithography technology developed at MIT, and PGL’s industry-leading process expertise. The company occupies 20,000 sq. ft. of dedicated manufacturing, engineering, and office space in Carver, MA, just outside of Plymouth, and about 45 miles south of Boston.

5 Commerce Way, Carver, MA 02330, USA|+1.508.503.1719|

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