PMID- 33985065
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20210514
IS  - 1094-4087 (Electronic)
IS  - 1094-4087 (Linking)
VI  - 29
IP  - 9
DP  - 2021 Apr 26
TI  - Non-uniform adaptive angular spectrum method and its application to neural 
      network assisted coherent beam combining.
PG  - 13269-13287
LID - 10.1364/OE.423057 [doi]
AB  - Increasing the number of laser beams that can be coherently combined requires 
      accurate and fast algorithms for compensating phase and alignment errors. The 
      paper proposes to use a Fully Connected Artificial Neural Network (FCANN) to 
      correct the beam positioning perturbations by evaluating the beam shifts and 
      tilts from two images taken at slightly different locations. Then, since it is 
      practically impossible to have a large enough experimental dataset to train the 
      neural network, this approach required developing an accurate and fast simulation 
      method to evaluate the beam propagation in arbitrary directions, overcoming the 
      limitations occurring when the computation must be repeated a large number of 
      times. The numerical approach is a variant of the Angular Spectrum (AS) method, 
      called Non Uniform ADaptive Angular Spectrum (NUADAS) method, which relies on the 
      combination of non-uniform and adaptive Fourier transform algorithms to allow the 
      computation of an arbitrary field distribution in a plane that is shifted and 
      tilted with respect to the source. The parallel implementation of the NUADAS 
      method is discussed and the numerical and experimental validations are presented. 
      Then, an FCANN is trained using the synthetic dataset generated with the NUADAS 
      method and the results are discussed, demonstrating the viability of the proposed 
      approach not only for coherent beam combing, but also in other beam alignment 
      applications.
FAU - Mirigaldi, Alessandro
AU  - Mirigaldi A
FAU - Carbone, Maurizio
AU  - Carbone M
FAU - Perrone, Guido
AU  - Perrone G
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Opt Express
JT  - Optics express
JID - 101137103
SB  - IM
EDAT- 2021/05/15 06:00
MHDA- 2021/05/15 06:01
CRDT- 2021/05/14 01:01
PHST- 2021/05/14 01:01 [entrez]
PHST- 2021/05/15 06:00 [pubmed]
PHST- 2021/05/15 06:01 [medline]
AID - 450162 [pii]
AID - 10.1364/OE.423057 [doi]
PST - ppublish
SO  - Opt Express. 2021 Apr 26;29(9):13269-13287. doi: 10.1364/OE.423057.