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It is well known that this year is the 60th anniversary of the first laser operation by Ted Maiman on 16 May 1960. To celebrate this important event, HPL initiates to organize a feature collection of articles to recognize the 60th anniversary. For this purpose, we invite pioneers in the laser area to contribute review, commentary or research articles on laser development and applications.
The acceleration of polarized electrons, positrons, protons and ions in strong laser and plasma fields is a very attractive option for obtaining polarized beams in the multi-mega-electron volt range. Recently, there has been subst