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A diode pumped Pr 3+ :LiYF 4 laser at 639.5 nm has been demonstrated. With an incident pump power of 920 mW, the maximum red output power was 272 mW. Moreover, intracavity second harmonic gen eration (SHG) has also been achieved with a maximum ultraviolet power of 23 mW by using a β BaB 2 O 4 (BBO) nonlinear crystal. To the best of our knowledge, this is the first report on continuous wave ultraviolet generation by intracavity frequency doubling Pr 3+ :LiYF 4 laser.

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