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US 10,594,106 B2Granted
Symmetric out-of-plane configurations of diffractive gratings and method
AssigneeLawrence Livermore National Security, LLC
InventorsEmily F. Link, David A. Alessi, Leon C. Haefner, Jerald A. Britten
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Abstract
Grating pair architectures used for short pulse stretching, compression and pulse shaping are enabled for use at arbitrary use angles without inducing spatial frequency chirp. These symmetric out-of-plane diffractive grating arrangements are capable of adding or removing spatial, temporal and angular chirp at any incidence angle.
Claims20
An apparatus, comprising:
- a first grating pair comprising a first reflection grating and a second reflection grating, wherein said first reflection grating has a first plane defined as the plane that is both perpendicular to the grooves of said first reflection grating and includes the normal of said first reflection grating and wherein said second reflection grating is parallel to said first reflection grating;
- a fully symmetric mirror image configuration of said first grating pair;
- and
- means configured to direct an input beam of electromagnetic radiation outside of said first plane and onto said first reflection grating to produce a first diffracted beam that is conically diffracted, wherein said first diffracted beam will propagate from said first reflection grating and then onto said second reflection grating, wherein said second reflection grating comprises a line spacing configured to diffract said first diffracted beam to produce a second diffracted beam that is collimated, wherein said second diffracted beam has more spatial chirp than said input beam, wherein said second reflection grating is configured to direct said second diffracted beam into said fully symmetric mirror image configuration of said first grating pair to produce an output beam having less spatial chirp than said second diffracted beam.
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A method, comprising:
- providing a first grating pair comprising a first reflection grating and a second reflection grating, wherein said first reflection grating has a first plane defined as the plane that is both perpendicular to the grooves of said first reflection grating and includes the normal of said first reflection grating and wherein said second reflection grating is parallel to said first reflection grating;
- providing a fully symmetric mirror image configuration of said first grating pair;
- and
- directing an input beam of electromagnetic radiation outside of said first plane and onto said first reflection grating to produce a first diffracted beam that is conically diffracted, wherein said first diffracted beam will propagate from said first reflection grating and then onto said second reflection grating wherein said second reflection grating comprises a line spacing configured to diffract said first diffracted beam to produce a second diffracted beam that is collimated, wherein said second diffracted beam has more spatial chirp than said input beam, wherein said second reflection grating is configured to direct said second diffracted beam into said fully symmetric mirror image configuration of said first grating pair to produce an output beam having less spatial chirp than said second diffracted beam.
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Dependencies are inferred from the claim text.