Crystals May Be Key to a Practical Yellow Laser

A practical yellow laser could bring significant innovation to the fields of biomedical optics, spectroscopy and astronomy. Obtaining yellow laser light, however, requires bulky, inefficient equipment like organic dye or copper vapor lasers.

Now, a research team in India, using off-the-shelf technology—and just the right crystals—reports extraction of ultrafast yellow radiation in the 570-to-596-nm range and with excellent beam quality from a CR2+:ZnS laser

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https://www.osa-opn.org/home/newsroom/2020/september/crystals_may_be_key_to_a_practical_yellow_laser/