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Title: Phase and birefringence aberration correction

A Brillouin enhanced four wave mixing phase conjugate mirror corrects phase aberrations of a coherent electromagnetic beam and birefringence induced upon that beam. The stimulated Brillouin scattering (SBS) phase conjugation technique is augmented to include Brillouin enhanced four wave mixing (BEFWM). A seed beam is generated by a main oscillator which arrives at the phase conjugate cell before the signal beams in order to initiate the Brillouin effect. The signal beam which is being amplified through the amplifier chain is split into two perpendicularly polarized beams. One of the two beams is chosen to be the same polarization as some component of the seed beam, the other orthogonal to the first. The polarization of the orthogonal beam is then rotated 90.degree. such that it is parallel to the other signal beam. The three beams are then focused into cell containing a medium capable of Brillouin excitation. The two signal beams are focused such that they cross the seed beam path before their respective beam waists in order to achieve BEFWM or the two signal beams are focused to a point or points contained within the focused cone angle of the seed beam to achieve seeded SBS, and thus negate themore » effects of all birefringent and material aberrations in the system.« less
Inventors:
 [1];  [2]
  1. (Modesto, CA)
  2. (Livermore, CA)
Issue Date:
OSTI Identifier:
870506
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5535049
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
phase; birefringence; aberration; correction; brillouin; enhanced; wave; mixing; conjugate; mirror; corrects; aberrations; coherent; electromagnetic; beam; induced; stimulated; scattering; sbs; conjugation; technique; augmented; befwm; seed; generated; main; oscillator; arrives; cell; signal; beams; initiate; effect; amplified; amplifier; chain; split; perpendicularly; polarized; chosen; polarization; component; orthogonal; rotated; 90; degree; parallel; focused; containing; medium; capable; excitation; path; respective; waists; achieve; contained; cone; angle; seeded; negate; effects; birefringent; material; medium capable; signal beam; beam path; cell containing; polarized beam; stimulated brillouin; brillouin scattering; amplifier chain; phase conjugate; coherent electromagnetic; wave mixing; cell contain; conjugate mirror; /359/

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