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In page Green:
"As of mid-2011, direct green laser diodes at 510 nm and 500 nm have become generally available,[5] although the price remains relatively prohibitive for widespread public use. The efficiency of these lasers (peak 3%)[citation needed] compared to that of DPSS green lasers (peak 35%)[citation needed][6] may also be limiting adoption of the diodes to niche uses.
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