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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...
Nowadays, the development of broadband ultrafast saturable absoibers (SAs) based on carbon nanostructures (e.g., graphene, SWCNTs) and 2D-materials (e.g., MoS2, topological insulators) for passive Q-switching (PQS) and mode-locking (ML) of near-IR lasers (1–2 μm) is attracting a tremendous interest [1]. For PQS, such absorbers can be integrated into compact bulk (microchip) and waveguide lasers providing...
We studied operation characteristics of a Gd3+ and Lu3+ co-doped Yb:KYW planar waveguide laser, Q-switched by carbon nanotube-based saturable absorbers in two direct interaction and one evanescent-field interaction regimes.
We review our recent results on the fabrication and characterization of Tm 3+ -based waveguide lasers on monoclinic potassium double tungstates. We demonstrated laser oscillation in the CW regime, at ∼1.84μm, in slab and channel waveguides. In addition, using such guiding layers, we have demonstrated passive Q-switching in a slab waveguide laser.
CW mirrorless laser operation at 1840nm at room temperature was observed in buried rib waveguides of KY 0.58 Gd 0.22 Lu 0.17 Tm 0.03 (WO 4 ) 2 fabricated by structuring KY(WO 4 ) substrates by Ar-ion milling and subsequent liquid phase epitaxial growth of the active layer on these substrates. Laser efficiency and laser threshold seems to change...
Waveguide lasing of a Tm:KY(WO4)2 epitaxial layer in a monolithic cavity is reported. The laser was operated at 2 μm in the Q-switched mode using Cr2+:ZnSe as saturable absorber and in the continuous-wave regime.
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