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As a former owner of a 561nm - It's green and yellow. Depends on what colors saturate your eyes beforehand. Really, it is its own color - chartreuse.
And yes, typically 561nm is DPSS from Nd:YAG's 1122/1123nm line being doubled. Not terribly efficient, and even less practical for anything outside medical/DNA sequencing.
Old review here (color was corrected to as accurate to real life as I could get) - http://laserpointerforums.com/f40/50mw-561nm-pgl-iii-c-review-83748.html
And yes, typically 561nm is DPSS from Nd:YAG's 1122/1123nm line being doubled. Not terribly efficient, and even less practical for anything outside medical/DNA sequencing.
Old review here (color was corrected to as accurate to real life as I could get) - http://laserpointerforums.com/f40/50mw-561nm-pgl-iii-c-review-83748.html