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Power scaling of cryogenic Yb : LiYF 4 lasers

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Abstract

We demonstrate a cryogenically cooled Yb:LiYF4 (Yb:YLF) laser with 224W linearly polarized output power (pump-power limited) and a slope efficiency of 68%. The beam quality is characterized by an M21.1 at 60W output and M22.6 at 180W output. This level of average laser power is approximately 2 orders of magnitude higher than demonstrated previously in cryogenic Yb:YLF. Yb:YLF is attractive for femtosecond pulse generation because of its wide gain bandwidth, and this demonstration shows the potential for high-average-power subpicosecond pulse lasers.

© 2010 Optical Society of America

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