Profiles of ETM11 and ETM14, latest ETM coating by LMA

Document #:

LIGO-T1400717-v5

Document type:

T - Technical notes

Abstract:

The pair of ETMs coated by LMA has been delivered to Caltech and has been measured by LIGO. Characteristics of those mirrors have been studied. Overall, their performance is better than previous coatings. The spiral patterns are down by 2~4. The pair seems to degrade the CD, but the effect is tolerable.

Files in Document:

• ETM11 and ETM14 look fine. Better analysis. (T1400717-v5.pdf, 2.6 MB)

Other Files:

• Word version (T1400717-v5.docx, 4.5 MB)

Topics:

• Modelling
• Core Optics

Authors:

• Hiro Yamamoto

Keywords:

ETM11 ETM14 LMA coating spiral pattern

Notes and Changes:

Extensive comparison of PSDs before and after coating is added

Referenced by:

• LIGO-E1500098: ETM11 Coating, spherical aberration waiver
• LIGO-E1500099: ETM14 Coating, spherical aberration waiver
• LIGO-E1500147-v1: aLIGO, Waiver Log