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Good read on semiconductor lasers.

joeyss

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dspace.wul.waseda.ac.jp/dspace/bitstream/2065/28772/3/Honbun-4558.pdf

All about what bandgap ranges and WLs and how efficient they are. According to a graph in their green diodes should be about 5% efficient, which is what they are now more or less. Give it a skim
 




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