Fused-silica gratings broaden diffraction applications

July 1, 2007
Conventional diffraction gratings are typically replicated in polymer from high-quality and expensive master gratings.
Th 0707lfw Newsbksilica

Conventional diffraction gratings are typically replicated in polymer from high-quality and expensive master gratings. Because many polymers are not optically suited for transmission and have poor thermal stability and limited lifetime, these replicated gratings are usually coated with metals and used in reflection mode. But by taking conventional photoresist-patterning techniques one step further and using semiconductor-etching technology, scientists at Ibsen Photonics (Farum, Denmark) are fabricating low-cost, high-quality transmissive diffraction gratings in fused silica, taking advantage of silica’s optical transparency from the deep-UV to the near-IR, its high-temperature and long-lifetime performance, and its close to 100% diffraction efficiency even with high grating resolution and line spacings from 450 to 3000 lines/mm.

The Ibsen technique uses a holographic stepper to first fabricate a grating pattern in photoresist, but transfers the pattern to bulk silica with a reactive ion-etch process that produces a 100% dielectric component free of both polymers and metals. These fused-silica diffraction gratings are particularly suited to laser-pulse-compression applications (where high-power tolerance is required), as well as to more compact spectrometer designs due to their transmissive mode of operation. Contact Torben Jacobsen at [email protected].

About the Author

John Wallace | Senior Technical Editor (1998-2022)

John Wallace was with Laser Focus World for nearly 25 years, retiring in late June 2022. He obtained a bachelor's degree in mechanical engineering and physics at Rutgers University and a master's in optical engineering at the University of Rochester. Before becoming an editor, John worked as an engineer at RCA, Exxon, Eastman Kodak, and GCA Corporation.

Sponsored Recommendations

Request a quote: Micro 3D Printed Part or microArch micro-precision 3D printers

April 11, 2024
See the results for yourself! We'll print a benchmark part so that you can assess our quality. Just send us your file and we'll get to work.

Request a free Micro 3D Printed sample part

April 11, 2024
The best way to understand the part quality we can achieve is by seeing it first-hand. Request a free 3D printed high-precision sample part.

How to Tune Servo Systems: The Basics

April 10, 2024
Learn how to tune a servo system using frequency-based tools to meet system specifications by watching our webinar!

Precision Motion Control for Sample Manipulation in Ultra-High Resolution Tomography

April 10, 2024
Learn the critical items that designers and engineers must consider when attempting to achieve reliable ultra-high resolution tomography results here!

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!