EMF Delivers Enhanced Coating for Multi-Agency Space Telescope

Expert tooling and handling augment precision re-coating


A Harsher Environment

EMF large format coating
Space Surveillance Telescope – Courtesy Photo by DoD, VIRIN: 161021-D-ZZ999-999

When the decision was made to move a government-sponsored astronomical telescope to a new facility thousands of miles away, the program chose to re-coat the mirrors with a more durable coating. The telescope had originally gone online in 2011 so its major optics had already been coated several times, and the new environment was expected to be much harsher. L-3 Technologies (now L3Harris Technologies), the prime contractor on the project, asked EMF to bid.

Due diligence in selecting a coating provider is a lengthy process for most large format optics, and it was notably so with this project because the optics were irreplaceable. The sheer size of the optics – a small mirror six feet in diameter weighing 1,800 lbs, and the other at eight feet in diameter and 2,400 lbs combined with their system design – necessitated highly specialized tooling equipment and handling procedures to move them in and around a facility without causing damage. After months of due diligence that involved capabilities surveys, interviews, and site visits, EMF was awarded the contract.

Collaboration and Transparency

Usually, when an optic is shipped to a coater it disappears only to reemerge once the work is completed. However, EMF embraces collaboration and the transparency customers earn for throughout every step of the coating process. In this project, the multi-agency program management and mission-critical nature of the optics meant that program stakeholders were on-site and involved in every step of the process, which EMF easily accommodated. The internal and external teams worked closely to establish and execute a plan to safely strip and precisely re-coat each mirror within an aggressive timeline. 

Looking Ahead of the Curve

More than 80 years of experience with large format optics has taught the team to expect the unexpected. EMF’s robust processes allow it to capture and swiftly pivot to address unexpected developments that could otherwise derail a project. This project had more than a few, not the least of which were:

  • A tooling redesign, when undisclosed requirements came to light.
  • The discovery of a chemical compatibility concern.
  • Heightened requirements to review and document every movement of and around the optics.

Throughout it all, and as is demonstrated on every project, EMF kept lines of communication with all stakeholders open while staying solution-oriented and nimble in an evolving environment.

Ultimately, EMF’s commitment to process paid off – the project was completed on time and to full spectral and environmental requirements. Anecdotal comments such as “that’s the best coating we have ever seen on that optic,” held extra weight considering the mirrors had been coated by others on at least three separate occasions. Since departing EMF’s facility, the telescope has been transported to its new location and successfully achieved ‘first light’. It is expected to return to full operation in 2022.

We have two successfully coated optics. The prolonged coating life will allow the telescope to operate its mission longer, with less downtime. Telescope downtime is a critical component of the mission’s success.

Highly technical programs have challenges, but its how those challenges are resolved that really make programs successful.In this case, we had issues, but thru the hard, persistent work of EMF, the challenges were overcome. Thank you for EMF’s commitment to success.”

Steve Mix, Project Team Leader, L-3 Technologies
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