Title page for ETD etd-11082011-115541

Type of Document Dissertation
Author Fricke, Tobin Thomas
Author's Email Address tobin.fricke@ligo.org
URN etd-11082011-115541
Title Homodyne Detection for Laser-Interferometric Gravitational Wave Detectors
Degree Doctor of Philosophy (Ph.D.)
Department Physics & Astronomy
Advisory Committee
Advisor Name Title
González, Gabriela Committee Chair
Blackmon, Jeff Committee Member
Joel, Tohline Committee Member
Johnson, Warren Committee Member
Shipman, Stephen Dean's Representative
  • optics
  • gravitational waves
Date of Defense 2010-10-14
Availability unrestricted
Gravitational waves are ripples of space-time predicted by Einstein's

theory of General Relativity. The Laser Interferometer

Gravitational-wave Observatory (LIGO), part of a global network of

gravitational wave detectors, seeks to detect these waves and study

their sources.

The LIGO detectors were upgraded in 2008 with the dual goals of

increasing the sensitivity (and likelihood of detection) and proving

techniques for Advanced LIGO, a major upgrade currently underway. As

part of this upgrade, the signal extraction technique was changed from

a heterodyne scheme to a form of homodyne detection called DC readout.

The DC readout system includes a new optical filter cavity, the output

mode cleaner, which removes unwanted optical fields at the

interferometer output port.

This work describes the implementation and characterization of the new

DC readout system and output mode cleaner, including the achieved

sensitivity, noise couplings, and servo control systems.

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