Method for removing tilt control in adaptive optics systems

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871512

Salmon, Joseph Thaddeus ^[1]

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1. Livermore, CA

A new adaptive optics system and method of operation, whereby the method removes tilt control, and includes the steps of using a steering mirror to steer a wavefront in the desired direction, for aiming an impinging aberrated light beam in the direction of a deformable mirror. The deformable mirror has its surface deformed selectively by means of a plurality of actuators, and compensates, at least partially, for existing aberrations in the light beam. The light beam is split into an output beam and a sample beam, and the sample beam is sampled using a wavefront sensor. The sampled signals are converted into corresponding electrical signals for driving a controller, which, in turn, drives the deformable mirror in a feedback loop in response to the sampled signals, for compensating for aberrations in the wavefront. To this purpose, a displacement error (gradient) of the wavefront is measured, and adjusted by a modified gain matrix, which satisfies the following equation: G'=(I-X(X.sup.T X).sup.-1 X.sup.T)G(I-A)

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5745309
• OSTI ID: 871512
• Country of Publication: United States
• Language: English

Related Subjects

method
removing
tilt
control
adaptive
optics
systems
operation
whereby
removes
steps
steering
mirror
steer
wavefront
desired
direction
aiming
impinging
aberrated
light
beam
deformable
surface
deformed
selectively
means
plurality
actuators
compensates
partially
existing
aberrations
split
output
sample
sampled
sensor
signals
converted
corresponding
electrical
driving
controller
drives
feedback
loop
response
compensating
purpose
displacement
error
gradient
measured
adjusted
modified
matrix
satisfies
following
equation
i-x
-1
i-a
deformable mirror
wavefront sensor
feedback loop
electrical signals
output beam
electrical signal
light beam
sample beam
steering mirror
corresponding electrical
sampled signal
method removes
desired direction
tilt control
adaptive optics
/359/250/356/