From the article > Full Width at Half Maximum (FWHM). The FWHM increases slowly and at continually slowing pace with increasing time. Notably, even after some

From the article > Full Width at Half Maximum (FWHM). The FWHM increases slowly and at continually slowing pace with increasing time. Notably, even after some ten minutes, the linewidth has increased from 40 µm to merely 90 µm