PMID- 26560908
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20160212
LR  - 20181023
IS  - 1520-8532 (Electronic)
IS  - 1084-7529 (Linking)
VI  - 32
IP  - 11
DP  - 2015 Nov 1
TI  - Optimal beam focusing through turbulence.
PG  - 1943-51
LID - 10.1364/JOSAA.32.001943 [doi]
AB  - Beam spread and beam wandering are the most perceptible effects of atmospheric 
      turbulence on propagating laser beams. The width of the mean irradiance profile 
      is typically used to characterize the beam spread. This so-called long-term (LT) 
      statistic allows for a relatively simple theoretical description. However, the LT 
      beam size is not a very practical measure of the beam spread because its 
      measurements are sensitive to the movements of the source and detector, and to 
      the large-scale variations of the refractive index that are not associated with 
      turbulence. The short-term (ST) beam spread is measured relative to the 
      instantaneous position of the beam center and is free of these drawbacks, but has 
      not been studied as thoroughly as the LT spread. We present a theoretical model 
      for the ST beam irradiance that is based on the parabolic equation for the beam 
      wave propagation in random media, and the Markov approximation for calculation of 
      the statistics of the optical field, and discuss an approximation that allows 
      introduction of the isoplanatic ST point spread function (PSF). Unlike the LT 
      PSF, the ST PSF depends on the overall beam geometry. This allows optimization of 
      the initial beam field in terms of minimizing the ST beam size at the observation 
      plane. Calculations supporting this conjecture are presented for the simple case 
      of the coherent Gaussian beam, and Kolmogorov turbulence.
FAU - Charnotskii, Mikhail
AU  - Charnotskii M
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Opt Soc Am A Opt Image Sci Vis
JT  - Journal of the Optical Society of America. A, Optics, image science, and vision
JID - 9800943
EDAT- 2015/11/13 06:00
MHDA- 2015/11/13 06:01
CRDT- 2015/11/13 06:00
PHST- 2015/11/13 06:00 [entrez]
PHST- 2015/11/13 06:00 [pubmed]
PHST- 2015/11/13 06:01 [medline]
AID - 327762 [pii]
AID - 10.1364/JOSAA.32.001943 [doi]
PST - ppublish
SO  - J Opt Soc Am A Opt Image Sci Vis. 2015 Nov 1;32(11):1943-51. doi: 
      10.1364/JOSAA.32.001943.