A laser type in a flow cytometer with a wavelength of about 560nm. The green and yellow laser are more effective at exciting PE and its tandems than the traditional blue laser. The yellow laser is also often used to excite the “fruit” dyes like mCherry.
For more information, please review this journal article:
Telford W, Murga M, Hawley T, et.al. (2005). DPSS yellow-green 561-nm lasers for improved fluorochrome detection by flow cytometry. Cytometry. 68A: 36-44