研究目的
Investigating the use of random phase plates (RPPs) for high-energy sub-picosecond lasers to achieve uniform intensity distribution in the focus.
研究成果
The implementation of an RPP at a short-pulse laser facility is technically feasible and provides a far-field intensity distribution as expected. This method shows no significant drawbacks for the laser and has been successfully implemented at the PHELIX laser facility.
研究不足
The main drawback associated with this particular RPP design is a reduction of the maximum allowed energy by nearly a factor of 2 because of phase discontinuities in the near-field.
1：Experimental Design and Method Selection:
The study involves implementing an RPP near the beginning of the amplifier and image-relaying it throughout the laser amplifier to achieve a uniform intensity distribution in the focus.
2：Sample Selection and Data Sources:
The PHELIX laser facility is used for experimental validation.
3：List of Experimental Equipment and Materials:
Includes a random phase plate (RPP), high-energy sub-picosecond lasers, and focusing optics.
4：Experimental Procedures and Operational Workflow:
The RPP is inserted in lieu of the standard serrated apodizer, and the beam is tilted to select its first order via the first telescope and a spatial filter.
5：Data Analysis Methods:
The intensity distribution of the beam at full energy is analyzed, and the far-field intensity distribution is recorded.
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