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Dual-wavelength operation of a diode-pumped Yb:YAP laser using a 1 mm-thick birefringent filter was demonstrated. Multiple wavelength pairs with wavelength separation ranging from 1.8 nm up to 11.3 nm could be generated. The gain balancing for oscillating wavelength pairs was based on the differential loss around a single transmission peak of the filter. In this regime of operation, separation of the wavelength pairs was not limited to the free-spectral range of the filter. This laser can be used to generate THz radiation using a photomixing technique.
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R. Akbari, J. Xu, X. Xu, A. Major, "Diode-pumped Yb:YAP laser with dual-wavelength output," Proc. SPIE 11664, Solid State Lasers XXX: Technology and Devices, 116641A (5 March 2021); https://doi.org/10.1117/12.2582441