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Polarization smoothing in a convergent beam.
David H Munro1, Shamasundar N Dixit, A Bruce Langdon
1Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA. munrol@llnl.gov
Applied Optics
|January 14, 2005
Summary
A new flat birefringent plate design offers polarization smoothing for high-power lasers, mimicking wedge performance in converging beams. This optic is ideal for the National Ignition Facility
Area of Science:
- Laser Physics
- Optical Engineering
Background:
- Polarization smoothing is crucial for high-power laser facilities like Omega and Nova.
- Previous methods utilized birefringent wedges in collimated beams.
- The National Ignition Facility (NIF) requires polarization control in converging beams.
Purpose of the Study:
- To introduce a novel polarization smoothing optic for converging laser beams.
- To adapt polarization smoothing techniques for the National Ignition Facility's final optics assembly.
Main Methods:
- Investigated the use of a flat birefringent plate in a converging beam.
- Designed the plate to closely mimic the polarization-smoothing effect of a wedge.
- Explored Z-cut crystal orientations for the flat plate design.
Main Results:
- A flat birefringent plate can effectively achieve polarization smoothing in converging beams.
- The proposed design is suitable for placement after the final focus lens at NIF.
- The optical axis configuration in the new design differs from traditional wedges.
Conclusions:
- The flat birefringent plate offers a viable solution for polarization smoothing in converging beams at NIF.
- This optic enhances laser performance by ensuring uniform polarization.
- The design represents an advancement in optical engineering for inertial confinement fusion facilities.