Useful for cutting in a line (although fs pulse length is overkill for most applications), not so efficient for surface modifications over large areas.

For enhanced absorbance, alternative technologies that come to mind could be electrodeposition with additives that preferentially bind specific crystal faces, nanoimprint lithography+etching. I was personally involved in developing an electroless deposition technology that created "black gold" that had broadband absorbance across NIR and visible wavelengths. That sucker was black, and easy to make!