Blue laser pointers, which became available around 2006, have the same basic construction as DPSS green lasers.
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In the early 1990s the Institute of High Pressure Physics at the Polish Academy of Sciences in Warsaw (Poland), under the leadership of Dr. Sylwester Porowski developed technology to create gallium nitride crystals with high structural quality and fewer than 100 defects per square centimeter — at least 10,000 times better than the best sapphire-supported crystal.
NYPD Blue | Toronto Blue Jays | Blue Peter | Blue | Blue Ridge Mountains | Blue Öyster Cult | Blue Note Records | laser | Blue Heelers | Pokémon Red and Blue | Winnipeg Blue Bombers | Blue Nile | Blue's Clues | ''Pokémon Red'' and ''Blue'' | Blue Man Group | Vida Blue | The Blue Danube | Rhapsody in Blue | blue plaque | Blue Mountain State | Blue Cheer | Blue Bloods | Blue Beetle | Ateneo Blue Eagles | Project Blue Book | Laser | Blue Hill, Maine | Operation Blue Star | Kind of Blue | Blue Bloods (TV series) |