Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1996-09-10
1999-01-26
Spyrou, Cassandra
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
359562, 359162, 372 9, 21912169, G02B 2746, H01S 310, B23K 2600
Patent
active
058644300
ABSTRACT:
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.
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Dickey Fred M.
Holswade Scott C.
Romero Louis A.
Chang Audrey
Grafe V. Gerald
Sandia Corporation
Spyrou Cassandra
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