High power red laser generation by second harmonic generation with GTR KTP cryst
In this Letter, a gray-tracking-resistant—potassium titanyl phosphate (GTR-KTP) crystal is used for intracavity frequency doubling red laser generation for the first time. Under the 808 nm LD pump power of 180 W, as high as 12.5 W of red laser output is obtained with the optimum repetition rate of 7
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