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LISA space optics and interferometry cleanroom

LISA space optics and interferometry cleanroom

Location: 133a

Close-up picture of fully bonded LISA Pathfinder optical bench

The space optics and interferometry cleanroom (ISO class 7, with class 3 laminar flow cabinets) is where precision-aligned, robust, ultra-stable optical components and assemblies for LISA Pathfinder were assembled, integrated, verified and tested. The labs are currently used for the development, construction and testing of space-flight technologies for the ESA-led LISA Mission. For LISA Pathfinder, a gravitational wave detector technology demonstration mission, optical benches were constructed here using the hydroxide catalysis bonding technique to manufacture quasi-monolithic optical components, sub-assemblies and benches. This work required optical components to be aligned and bonded with high precision (<4 micrometre and <10 microradian). Now, for the larger quantities of optical sub-assemblies required for LISA, this high precision bonding is achieved with an automated alignment and component placement system. Through engagement with these activities, the labs are well equipped to engage in commercial, industrial or aerospace of similar optical assemblies.

The lab houses:

  • Computer controlled coordinate measurement machine (DEA Global Image) with 1×0.7×0.5 m measurement volume, Renishaw probe. Accuracy <10 microns over measurement volume
  • Two six axis micro-manipulating Physik Instrument M-824 Hexapods
  • Multiple servo-controlled 1064 nm Nd:YAG light sources and associated passive and active optics and measurement devices.
  • Hydroxide-catalysis bonding facilities, including class 3 laminar flow cabinets.
  • High precision automated HCB interferometric alignment and placement tooling.
  • Space-qualified optical and structural adhesive facilities (two-part and UV cure).
  • Thermal cycling and thermal vacuum cycling facility, -10°C to +50°C. Vacuum chamber with internal dimensions 600mm diameter and depth 500mm. Pumped by an oil-free turbo pump (Edwards STP301) and thermally driven by a Julabo FP50HE. The chamber has multiple optical and electrical feedthroughs.