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Branch Point Mitigation of Thermal Blooming Phase Compensation Instability
Paperback
ISBN13: 9781025129310
Publisher: Hutson Street Press
Published: May 22 2025
Pages: 268
Weight: 0.84
Height: 0.56 Width: 6.14 Depth: 9.21
Language: English
Thermal blooming can have a major impact on high-energy laser (HEL) beam propagation in the atmosphere. In theory, an adaptiveoptics (AO) system can mitigate the nonlinear optical effects induced by thermal blooming; however, when a single deformable mirror is used for phase-only compensation, analysis predicts the possibility of instability. This instability is appropriately termed phase compensation instability (PCI) and arises with the time-dependent development of spatial perturbations found within the HEL beam. These spatial perturbations act as local hot spots that produce negative-lens-like optical effects in the atmosphere. An AO system corrects for the hot spots by applying positive-lens-like phase compensations. In turn, this increases the strength of the thermal blooming and leads to a runaway condition, i.e. positive feedback in the AO control loop. This study uses a series of computational wave-optics experiments to explore the conditions for insipient PCI. Horizontal propagation is modeled with the effects of extinction, thermal blooming, and turbulence for a focused Gaussian beam. In addition, a nominal AO system is used for phase compensation from a point source beacon. Results show that the development of branch points under strong thermal blooming reduces the possibility of PCI.
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Branch Point Mitigation of Thermal Blooming Phase Compensation Instability
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Spencer, Mark F.
Branch Point Mitigation of Thermal Blooming Phase Compensation Instability
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