Viewports (at Room Temperature)

Related subgroups: MIR, IOO, MIF, VAC, CRY, VIS...

Scope

This subsystem provides the optical viewports mounted on the vacuum chambers to pass the optical beams into or from the LCGT in-vacuum interferometer. The optical beams include...

The viewport subsystems that will be dedicated to the cryo-vacuum chambers for the future LCGT are NOT included in the scope of this subsystem so far.

Applicable Documents

• Spec. for vacuum chambers
• Optical Layout Drawing of the LCGT interferometer
• Length Sensing and Control doc
• Alignment Sensing and Control doc
• Optical lever doc
• CCD Monitor doc
• Any...

General Description

We can extract optical beams at the viewports from the interferometer inside the vacuum chamber. The optical beams are for length and alignment sensing and control scheme, optical levers for suspensions, and other monitoring devices (CCD or equivalent video cameras).

Dumping stray light beams?

• AR coating for 1064 nm and 532 nm
• Wedge angle

Details are described in Characteristics section.

Functions

Beams for

• Optical Lever
• Video camera
• Illumination
• Diagnostic
• Squeeze
• (Spare)

Naming Conventions

TBD

Locations

• BS chamber

Requirements

TBD

Characteristics

TBD

Inspection plans

TBD

Links

• LIGO-T1000746-v1, Viewports Subsystem Final Design Document

• LIGO-T1000022-v4, Viewports Subsystem Requirements Document

• LIGO-T1000334-v1, Review Report Interferometer Sensing and Control Final Design