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Co-Phasing an Array of Segmented Las...

Mitchell, Eric William.

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Co-Phasing an Array of Segmented Lasers Via Interferometry and Heterodyne Phase Locking Methods.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Co-Phasing an Array of Segmented Lasers Via Interferometry and Heterodyne Phase Locking Methods./
Author:	Mitchell, Eric William.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	62 p.
Notes:	Source: Masters Abstracts International, Volume: 82-07.
Contained By:	Masters Abstracts International82-07.
Subject:	Optics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28261542
ISBN:	9798557041928

Co-Phasing an Array of Segmented Lasers Via Interferometry and Heterodyne Phase Locking Methods.
Mitchell, Eric William.

Co-Phasing an Array of Segmented Lasers Via Interferometry and Heterodyne Phase Locking Methods. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 62 p.

Source: Masters Abstracts International, Volume: 82-07.

Thesis (M.S.)--The University of Arizona, 2020.

This item must not be sold to any third party vendors.

The Breakthrough Starshot Initiative aims to launch a nanocraft at 20 percent the speed of light to Proxima Centauri b. The spacecraft will be accelerated with a1064 nm laser beam of 100 GW propagated from a launch projector of several kilometers in diameter. The projector architecture will be a dense co-phased array of two-meter telescopes transmitting the light from many thousands of laser power amplifiers slaved to a single master oscillator (MO). The resulting system will produce a diffraction-limited beam at a distance of 0.3 AU. Implementation of adaptive optics in the segmented beam propagation systems is essential to overcome atmospheric aberration and phase jitter between the lasers. This work proposes the use of coherent beam combination and heterodyne phase-locking methods to measure and correct phase errors between the drive lasers at the projection apertures. Optical path length differences must be measured and corrected to below λ/10 to properly phase the sub-apertures. A small portion of the light will be sampled from the output of each amplifier and coherently mixed with frequency-shifted reference light from the MO, then demodulated to measure the phase error. The error signal is fed back to a phase correction element to correct for the phase jitter in closed-loop.In this work, we demonstrate heterodyne phase locking of a simple two-beam output experiment. The stability and frequency response of the closed-loop system is analyzed. Finally, methods for system improvement and scalability to a larger coherently combined laser array are discussed.

ISBN: 9798557041928Subjects--Topical Terms:

517925
Optics.
Subjects--Index Terms:

Breakthrough Starshot Initiative

Co-Phasing an Array of Segmented Lasers Via Interferometry and Heterodyne Phase Locking Methods.
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300 $a 62 p.
500 $a Source: Masters Abstracts International, Volume: 82-07.
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506 $a This item must not be sold to any third party vendors.
520 $a The Breakthrough Starshot Initiative aims to launch a nanocraft at 20 percent the speed of light to Proxima Centauri b. The spacecraft will be accelerated with a1064 nm laser beam of 100 GW propagated from a launch projector of several kilometers in diameter. The projector architecture will be a dense co-phased array of two-meter telescopes transmitting the light from many thousands of laser power amplifiers slaved to a single master oscillator (MO). The resulting system will produce a diffraction-limited beam at a distance of 0.3 AU. Implementation of adaptive optics in the segmented beam propagation systems is essential to overcome atmospheric aberration and phase jitter between the lasers. This work proposes the use of coherent beam combination and heterodyne phase-locking methods to measure and correct phase errors between the drive lasers at the projection apertures. Optical path length differences must be measured and corrected to below λ/10 to properly phase the sub-apertures. A small portion of the light will be sampled from the output of each amplifier and coherently mixed with frequency-shifted reference light from the MO, then demodulated to measure the phase error. The error signal is fed back to a phase correction element to correct for the phase jitter in closed-loop.In this work, we demonstrate heterodyne phase locking of a simple two-beam output experiment. The stability and frequency response of the closed-loop system is analyzed. Finally, methods for system improvement and scalability to a larger coherently combined laser array are discussed.
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