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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 k Hz. Within the red laser power variation range between the maximum to 70%, a temperature tolerance is measured to be 35°C. The results prove that GTR-KTP should be a potential nonlinear crystal for red laser generation.
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 k Hz. Within the red laser power variation range between the maximum to 70%, a temperature tolerance is measured to be 35 ° C. The results prove that GTR-KTP should be a potential nonlinear crystal for red laser generation.