Abstract

The spectroscopic properties and tunable laser performances of the orthorhombic perovskite Tm:GdScO₃ crystal grown by the Czochralski method are comparatively studied for polarization along different crystallographic axes. The polarized emission spectrum of Tm:GdScO₃ along the b-axis exhibits, to the best of our knowledge, the broadest bandwidth among all the single Tm³⁺-doped bulk gain media, indicating the strong inhomogeneous line broadening of Tm³⁺ ions in GdScO₃ and thus leads to a broad and smooth gain spectrum. Tunable laser operation with a tuning range as broad as 321 nm from 1824 nm to 2145 nm is achieved, which indicates its potential for few-optical-cycle pulse generation in the 2-µm spectral range.

© 2023 Optica Publishing Group

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