I came across "we used Nd:YAG laser achromats" in a paper, and I was wondering what exactly is the purpose of achromats here. The paper in question is "Dynamics of laser-induced cavitation bubbles near an elastic boundary" by Brujan et. al., and the relevant part of the text is:
...a Nd:YAG laser achromat (f = 200 mm) to allow a large focusing angle together with a large distance between focus and cuvette walls. A second Nd:YAG laser achromat (f = 125 mm) focused the laser pulses into the glass cuvette. Achromats were used for beam collimation and focusing to minimize spherical aberrations...
I understand the main point behind achromats for general optics - to reduce or eliminate chromatic aberrations for different wavelengths (for visible light typically red and blue, so the green and the rest of visible spectrum ends up mostly fine too).
However, what is the point behind using these elements for laser light? This light is essentially monochromatic anyway. I also found http://catalog.rossoptical.com/catalog/doublets-and-triplets/laser-achromats/ that says their laser achromats "have been corrected for spherical aberration, coma and astigmatism.". No emphasis on chromatic aberrations for laser light either.
So, what is the purpose of "laser achromat" in this context? Is the point reducing that bit of chromatic aberration for mostly monochromatic light, or are they somehow inherently better for those other aberrations than other lenses?