Liu R, Hu D, Deng X, Zhao J, Wang W, Dai W, Zhou W, Huang X, Li M, Yang S. Shannon entropy method of small-scale self-focusing assessment in high-power laser systems.
OPTICS EXPRESS 2016;
24:2293-2298. [PMID:
26906805 DOI:
10.1364/oe.24.002293]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Through analysis of near-field beam profiles, we propose a method using Shannon entropy to assess the development of small-scale self-focusing during laser propagation and amplification in high-power laser systems. In this method, the entropy curve that corresponds to increasing B integral displays an evident turning point at which small-scale self-focusing starts to rapidly develop. In contrast to classical methods using contrast, modulation, or power spectral density, the proposed method provides the B integral criterion more clearly and objectively. This approach is an optimization method that can be utilized in the design and operation of high-power laser systems.
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