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Title: Gaussian beam profile shaping apparatus, method therefor and evaluation thereof

Patent ·
OSTI ID:872120
 [1];  [1];  [1]
  1. Albuquerque, NM
+ Show Author Affiliations

A method and apparatus maps a Gaussian beam into a beam with a uniform irradiance profile by exploiting the Fourier transform properties of lenses. A phase element imparts a design phase onto an input beam and the output optical field from a lens is then the Fourier transform of the input beam and the phase function from the phase element. The phase element is selected in accordance with a dimensionless parameter which is dependent upon the radius of the incoming beam, the desired spot shape, the focal length of the lens and the wavelength of the input beam. This dimensionless parameter can also be used to evaluate the quality of a system. In order to control the radius of the incoming beam, optics such as a telescope can be employed. The size of the target spot and the focal length can be altered by exchanging the transform lens, but the dimensionless parameter will remain the same. The quality of the system, and hence the value of the dimensionless parameter, can be altered by exchanging the phase element. The dimensionless parameter provides design guidance, system evaluation, and indication as to how to improve a given system.

Research Organization:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
US 5864430
OSTI ID:
872120
Country of Publication:
United States
Language:
English

References (8)

Diffractive Optical Elements For Use In Infrared Systems journal June 1989
Multifaceted Laser Beam Integrators: General Formulation And Design Concepts journal November 1988
Kinoform phase plates for focal plane irradiance profile control journal January 1994
Laser beam profile shaping with interlaced binary diffraction gratings journal January 1982
Method for converting a Gaussian laser beam into a uniform beam journal March 1981
Geometrical transformations in optics* journal January 1974
Holographic conversion of a Gaussian beam to a near-field uniform beam journal January 1991
Transforming a circular laser beam into a square or trapezoid--almost journal January 1992

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Related Subjects

gaussian
beam
profile
shaping
apparatus
method
evaluation
maps
uniform
irradiance
exploiting
fourier
transform
properties
lenses
phase
element
imparts
design
input
output
optical
field
lens
function
selected
accordance
dimensionless
parameter
dependent
radius
incoming
desired
spot
shape
focal
length
wavelength
evaluate
quality
control
optics
telescope
employed
size
target
altered
exchanging
remain
hence
value
provides
guidance
indication
improve
phase element
input beam
focal length
fourier transform
beam profile
output optical
gaussian beam
transform lens
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