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I have never seen a direct diode exceed 538nm ever in writing. 560nm is dream land for stable semiconductors atm. 539-598nm is a semiconductor void as far as I'm aware from researching.
Edit: And why is there a DPSS on a diode only list?
Edit 2: Research has been done with quantum wells with the same material CO2 lenses are made out of (ZnSe). That is all I've found. ~560-561nm. One referenced a picosecond diode. So not ordinary semiconductor tech to say the least.
www.researchgate.net
Edit: And why is there a DPSS on a diode only list?
Edit 2: Research has been done with quantum wells with the same material CO2 lenses are made out of (ZnSe). That is all I've found. ~560-561nm. One referenced a picosecond diode. So not ordinary semiconductor tech to say the least.

ZnSe-based laser diodes for the 560 nm spectral region | Request PDF
Request PDF | ZnSe-based laser diodes for the 560 nm spectral region | Reports the fabrication, the optimization and the operational characteristics of ZnSe-based laser diodes with quarternary ZnCdSSe quantum wells... | Find, read and cite all the research you need on ResearchGate

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