Abstract
During the past decade, femtosecond pulse direct-laser-written (fs-DLW) waveguides in transparent materials have emerged as an enabling technology for the production of laser-active integrated photonic devices [1]. The thulium (Tm3+) ion is attractive for its eye-safe broadband emission at ~2 µm (3F4 → 3H6 transition). Tm waveguide lasers are interesting for environmental and medical sensing applications. Monoclinic double tungstates (DTs), KRE(WO4)2 where RE = Gd, Y, or Lu, doped with Tm3+ ions, are known as excellent materials for efficient liquid-phase epitaxy (LPE) grown waveguide lasers at ~2 µm [2]. In the present work, the first fs-DLW Tm:DT waveguide laser is realized.
© 2017 IEEE
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