Substrate Information

PGL diffraction gratings are manufactured using a variety of substrate sizes, shapes, and materials, determined by optical and mechanical performance requirements of the final product.

Generally rectangular shapes are preferred for end-use and production reasons. For reflection gratings with good diffracted wavefront performance, the thickness should be nominally about 1/6 of the transverse dimensions, with a maximum thickness of 100 mm.

Fused silica is an ideal material choice for most applications due to its excellent stiffness and thermal expansion coefficient combined with its availability, manufacturability, and reasonable cost. For the most demanding wavefront error requirements, especially in thermally sensitive applications, ultralow-expansion materials like CLEARCERAM-Z® and ZERODUR® are also good choices. Other materials are possible but typically require compromise on some aspects of performance, or cost, or both.

Substrate Grooves

PGL utilizes grooves on the sides of its rectangular substrates to facilitate handling during manufacturing as well as final mounting of the gratings. The following groove profiles are standard for PGL. Other groove profiles are possible but generally add cost and lead time to the grating manufacturing process.

6 mm Round / 10 mm Thick

Substrate thickness ≥ 10 mm and weight ≤ 5 lbs

6 mm Round / 14 mm Thick

Substrate thickness ≥ 14 mm and weight ≤ 10 lbs

6 mm Round / 20 mm Thick

Substrate thickness ≥ 20 mm and weight ≤ 10 lbs

10 mm Round / 25 mm Thick

Substrate thickness ≥ 25 mm and weight ≤ 20 lbs

10 mm Round / 40 mm Thick

Substrate thickness ≥ 40 mm and weight ≤ 20 lbs

10 mm Round Deep / 40 mm Thick

Substrate thickness ≥ 40 mm and weight ≥ 20 lbs

10 mm Round Deep / 75 mm Thick

Substrate thickness ≥ 75 mm and weight ≥ 20 lbs

20 mm x 14 mm Rectangular / 75 mm Thick

Substrate thickness ≥ 75 mm and weight ≥ 20 lbs

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|sales@plymouthgrating.com

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