On-Chip Optics Makes Continuous Visible Light from Low-Power Infrared

If you shine a red laser pointer through a glass window you wouldn't expect it to come out blue on the other side, but with a much brighter beam it just might. At high intensities light energy tends to combine and redistribute, so that red light really can produce blue.

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<p><a href="http://www.physorg.com/news100355022.html">On-Chip Optics Makes Continuous Visible Light from Low-Power Infrared</a></p> <p>If you shine a red laser pointer through a glass window you wouldn't expect it to come out blue on the other side, but with a much brighter beam it just might. At high intensities light energy tends to combine and redistribute, so that red light really can produce blue. </p>