Robust synthesis method improves dielectric-mirror design

March 1, 2011
Many significant breakthroughs in ultrafast-laser technology have been made possible by improvements in ultrafast laser optics, specifically in the development of thin-film dielectric coatings and processes.

Many significant breakthroughs in ultrafast-laser technology have been made possible by improvements in ultrafast laser optics, specifically in the development of thin-film dielectric coatings and processes. Despite these improvements, electron-beam evaporation, magnetron sputtering, and other fabrication techniques are still prone to deposition errors. In an effort to minimize those errors and improve dielectric-mirror design, researchers from Ludwig-Maximilians-Universität München (Munich, Germany), Ultrafast Innovations (Garching, Germany), and Moscow State University (Moscow, Russia) have developed a new robust synthesis method that can be used to design dispersive mirrors that are impossible to produce using conventional needle optimization techniques.

The robust synthesis method is essentially a generalization of very efficient needle optimization and gradual evolution techniques, and is based on a simultaneous optimization of spectral characteristics of multiple designs located in a small neighborhood of the main or pivotal design. Using the method and a conventional needle optimization technique, the research team fabricated dispersive mirrors operating from 690–890 nm with a dispersion of -300 fs2 at 800 nm. The mirror fabricated using the robust synthesis method had much lower sensitivity to deposition-layer thickness errors and exhibited much-less-pronounced resonance errors. Contact Vladimir Pervak 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

Digitizer system available in seven different models

Nov. 26, 2023
The Star-Hub digitizer system can be used with any cards from the M5i.33xx PCIe digitizer family.

High-speed cameras offer UV-extended capability

Nov. 25, 2023
The Phantom T3610, T2410, and TMX high-speed cameras (TMX 7510/6410/5010) are available in a UV variant.

Linear voice coil motors offer peak force of 2.20 N

Nov. 24, 2023
The LVCM-013-032-02M and LVCM-013-032-02 are 12.7 mm diameter linear voice coil motors.

Image sensor has use in home and professional security

Nov. 23, 2023
The OS08C10 image sensor features both staggered high dynamic range (HDR) and single exposure dual analog gain (DAG).

Voice your opinion!

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