Historically it has been extremely difficult to adapt steel honeycomb optical tops to meet the rigorous requirements of vacuum chamber applications. Engineers have sacrificed the rigidity, flatness, damping and convenience of optical tops for baked, vacuum compatible machined structures of aliminium and stainless steel. Until now.
TMC has combined their inherently clean CleanTop® design with several new proprietary design features, cleaning methods, and a vacuum pump-down procedure developed for the University of Texas' Petawatt laser Project to achieve a level of vacuum compatibility previously unattainable. Though this new design does not require baking (and is incompatible with baking), engineers at the University of Texas Petawatt Laser have achieved 8 x 10-7 Torr in a 7-foot diameter, 380 cubic foot chamber containing a 14-foot long CleanTop Optical Top.
Closely correlated with their vacuum compatibility is the fact that these tops only out-gas extremely small amounts ensuring they do not damage optics (because attaining the target vacuum level would be of little value if the top emitted enough contamination to damage optics). The top for the Petawatt Laser application was demonstrated to cause less than 0.1% loss in optical transmission of a test optic.
- Patented CleanTop® II clean optical top design
- Stainless steel honeycomb core
- Stainless steel CleanTop cups
- Vacuum compatible core geometry
- Vent fittings on table end-wall
- Special cleaning of process materials
- Cleaning and packing in accordance with strict standards of NIF Project (National Ignition Facility at Lawrance Livermore National Labs)
- Special pump-down procedure used in conjuntion
- Developed in cooperation with the University of Texas Petawatt Laser Project
A 14-foot long TMC vacuum compatible CleanTop II Optical Top mounted in a
7-foot diameter, 380 cubic foot vacuum chamber (shown with Siskiyou large,
vacuum compatible, round optics mounts). Photo courtesy of Texas Centre for
High Intensity Laser Science (The Texas Petawatt Laser) at the University of Texas Austin.