Mirror Thermoelastic Deflection in the LIGO Optical Surface Absorption Measurement System

Document #:

LIGO-T970212-v1

Document type:

T - Technical notes

Abstract:

Calculation of the transient thermoelastic response of a high relectance mirror in an optical cavity used for material contamination measurements.

The Optical Contamination Facility (formerly the OTF, Optical Test Facility) consists of 3 vacuum chambers with high-finesse, resonant optical cavities used to test the effect of outgassing from materials/assemblies on optical properties (absorption, scatter @1064nm) over time.

basic description: P990032

original block diagram: D1001800

new block diagram: D1800215

compendium of all materials/assemblies tested to date (includes RGA results as well): E1000193

Files in Document:

• T970212-00.pdf (77.8 kB)

Other Files:

• OCF mirror transient deflection.JPG (170.3 kB)
• OCF optic transient thermoelastic response.nb (5.9 MB)
• OCF optic transient thermoelastic response.pdf (6.5 MB)
• OCF2.wbpz (48.3 MB)

Topics:

• Document Migration from the old DCC

Authors:

• Dennis Coyne

Keywords:

Absorption Measurement Mirrors_(Mirrors_For_Optics) Optics

Notes and Changes:

New calculations of the high reflectance transient surface temperature, and thermally induced deflection, for the mirrors used in the optical contamination facility/cavity using Ansys and an analytical model (for 1 watt absorbed power).