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Quantum limited optical phase detection in a high power suspended interferometer

IP.com Disclosure Number: IPCOM000128058D
Original Publication Date: 1999-Dec-31
Included in the Prior Art Database: 2005-Sep-14
Document File: 6 page(s) / 21K

Publishing Venue

Software Patent Institute

Related People

Lantz, Brian Thomas: AUTHOR [+3]

Related Documents

http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-135: URL

Abstract

The LIGO project (Laser Interferometer Gravitational-Wave Observatory) is currently engaged in the construction of a new observatory to measure gravitational radiation from astrophysical sources. The first generation of interferometric gravitational wave antennas is scheduled to come on-line in 2001. With an initial noise level of 3x10 -23 strain/vH-z

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 This record is the front matter from a document that appears on a server at MIT and is used through permission from MIT. See http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-135 for copyright details and for the full document in image form.

Quantum Limited Optical Phase Detection in a High Power Suspended Interferometer

by

Brian Thomas Lantz
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology February, 1999
SIGNATURE OF author: [[signature omitted]]

Department of Physics

February, 1999
CERTIFIED BY: [[SIGNATURE OMITTED]]

Rainer Weiss Department of Physics Thesis Supervisor ACCEPTED BY: [[SIGNATURE OMITTED]]

Thomas J. Greytak Professor, Associate Department Head for Education Department of Physics ARCHIVES MASSACHUSETTS INSTITUTE OF TECHNOLOGY LIBRARIES

Massachusetts Institute of Technology Page 1 Dec 31, 1999

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Quantum limited optical phase detection in a high power suspended interferometer

Quantum Limited Optics! Phase Detection in a High Power Suspended Interferometer

by

Brian Lantz

Submitted to the Department of Physics in February 1999, in partial fulfillment of the requirements for the degree of Doctor of Philosophy

Abstract

The LIGO project (Laser Interferometer Gravitational-Wave Observatory) is currently engaged in the construction of a new observatory to measure gravitational radiation from astrophysical sources. The first generation of interferometric gravitational wave antennas is scheduled to come on-line in 2001. With an initial noise level of 3x10-23strain/vH-z

at frequencies around 200Hz, these antennas represent the most sensitive instruments ever constructed for the detection of gravitational radiation, To achieve the required sensitivity, the antennas are configured as recycled Michelson Interferometers with Fabry-Perot cavities in the Michelson arms.

One of the fundamental limits associated with an instrument of this type is the ability to detect differential phase shifts between the beams returning to the beamsplitter from the Fabry-Perot arm cavities. To achieve the planned sensitivity to gravitational radiation, this detection should be limited only by photon courting statistics ("shot noise") at a level of 8x10- 11radians/vHz between 150Hz and lOkHz

The goal of this work is to develop and demonstrate the techniques which are necessary to achieve this optical phase sensitivity. A prototype recycled Michelson interferometer was constructed which reached an optical phase sensitivity of 12x10-11 radians/vHz above 600 Hz.

This thesis describes the methods used to achieve this optical phase sensitivity, and details the lessons learned from operating the prototype instrument. We pay particular attention to interferometric control of suspended optics, laser frequency control, and thermal lensing.

Thesis Supervisor: Rainer Weiss Title: Professor of Physics

Acknowledgments

To Rai, who talked with me one S...