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Dual-wavelength Yb:YAP laser with tunable wavelength separation

We demonstrated continuous-wave dual-wavelength operation of a Yb:YAP laser with intracavity birefringent element. The laser produced a wide range of wavelength pairs with spectral separation from 1 nm up to 35 nm. The average output power reached up to 800 mW. Dual-wavelength radiation was generated owing to the broad gain bandwidth of the Yb:YAP crystal and custom design of a birefringent filter.