We report widely tunable (∼260 nm) Tm3+ and Ho3+ doped fluorozirconate (ZBLAN) glass waveguide extended cavity lasers with close to diffraction limited beam quality (M2∼1.3). The waveguides are based on ultrafast laser inscribed depressed claddings. A Ti:sapphire laser pumped Tm3+-doped chip laser continuously tunes from 1725 nm to 1975 nm, and a Tm3+-sensitized Tm3+:Ho3+ chip laser displays tuning across both ions evidenced by a red enhanced tuning range of 1810 to 2053 nm. We also demonstrate a compact 790 nm diode laser pumped Tm3+-doped chip laser which tunes from 1750 nm to 1998 nm at a 14% incident slope efficiency, and a beam quality of M2∼1.2 for a large mode-area waveguide with 70 μm core diameter.
|Number of pages||9|
|Publication status||Published - 20 Oct 2014|