Construction and characterization of a universally tunable modulator
Name
297174977-MIT.pdf
Description
Full printable version
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8.47 MB
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Checksum (MD5)
a57fe4a41b12f605a40896d8a80c2a6d
Author(s)
Ackley, Sarah
Advisor(s)
Nergis Mavalvala.
Date Issued
2008
Publisher
Massachusetts Institute of Technology
Abstract
Arbitrary admixtures of amplitude and phase modulated light can be used to generate linear, null-crossing error signals for locking Fabry-Perot cavities that are detuned from resonance by arbitrary amounts. Unfortunately, no commercially available device is capable of producing the desired arbitrary combinations of amplitude and phase modulation. This work pertains to construction and characterization of a Universally Tunable Modulator (UTM), capable of producing just such combinations. The UTM was prototyped by modifying a New Focus 4104 amplitude modulator. With the application of feedback control of fabry-perot cavities in mind, the UTM was characterized using a test cavity to measure error signals. The resulting error signals were then fit to the calculated error signals to give the fractions of amplitude and phase modulation. It was shown that it is possible to produce nearly pure amplitude and phase modulation, as well as intermediate modulation states, using the UTM. The resulting error signals also indicate the UTM's suitability for both on- and off-resonance locking of Fabry-Perot cavities.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
Includes bibliographical references (p. 59-60).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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