daguin
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Why are blue diodes at 473nm so underpowered and expensive?
You need to read more. You are talking about two different things in the same question. There are BLUE diodes, but they are still very expensive. Most of the affordable blue laser systems available to us are DPSS modules, NOT diodes.
This thread is about violet (blu-ray) diodes that are being sold as blue diodes.
Peace,
dave