Phase and birefringence aberration correction

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870506

Bowers, Mark ^[1]; Hankla, Allen ^[2]

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1. Modesto, CA
2. Livermore, CA

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 the effects of all birefringent and material aberrations in the system.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Oakland, CA)
• Patent Number(s): US 5535049
• OSTI ID: 870506
• Country of Publication: United States
• Language: English

Related Subjects

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/