ETM08 and ETM09 Pinhole in HR

Document #:

LIGO-E1500121-v1

Document type:

E - Engineering documents

Abstract:

ETM08 H1-x ~200ppm peak transmission at a radius of 38mm
ETM09 L1-y ~900 ppm peak transmission at a radius of 33mm
Probe beam spot size 1mm
Back of the envelope estimate is ~sub ppm loss for the arm cavity.
The diameter of the pinhole on ETM09 is estimated at 10-20 micrometers based on
the divergence of the beam coming out the back.

Accepted at
https://services.ligo-wa.caltech.edu/integrationissues/show_bug.cgi?id=101

Files in Document:

• Bug 101_Pinhole transmission in ETM08 and ETM09.pdf (161.0 kB)

Topics:

• Quality Assurance
• Subsystem Test
• Core Optics

Authors:

• GariLynn Billingsley

Keywords:

ETM08 ETM09

Referenced by:

• LIGO-E1500131: ETM08 HR coating waiver
• LIGO-E1500132: ETM09 HR coating waiver
• LIGO-E1500147-v1: aLIGO, Waiver Log