## An experimental study of optical phase fluctuations in a random refractive field |

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### Contents

Theoretical Development | 9 |

Experimental Apparatus | 43 |

Experimental Results and Comparison with | 96 |

### Common terms and phrases

absolute phase power acousto-optic modulator amplifier amplitude aperture autocorrelation Ax/u bandwidth beam wave beamsplitter calibration carrier cm/sec coherence function Comparison computed convection convection interval curves downstream electronic experimental frozen flow assumption function for longitudinal heated grid index of refraction inertial subrange integral relations isotropic laser laser beam laser heterodyne interferometer longitudinal beam separations low frequency Mach-Zehnder interferometer mean flow velocity modulator noise power optical path phase demodulated phase fluctuation phase function phase measurements phase noise phase perturbations phase power spectrum phase signals phase spectrum Phase structure function photocathode photomultiplier photon pitot tube power-law presented in Fig probe beam propagation radians Relative phase power Reynolds number Richard Lynne rolloff scale Shao-Chi Lin simple power-law slope spectra statistical temperature field temperature fluctuations temperature power spectrum temperature spectrum temperature structure function tion translator assembly transverse beam separations turbulence tunnel values wavenumbers