Widely tunable in-band-pumped Tm:CaF 2 laser

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In-band pumping of Tm:LiYF 4 channel waveguide: a power scaling strategy for ∼2 μm waveguide lasers

International audienceWe report on a novel power scaling strategy for thulium waveguide (WG) lasers relying on in-band pumping by high-brightness Raman fiber lasers (RFLs) and the use of liquid-phase-epitaxy-grown fluoride crystalline thin films for better thermal management. Thulium channel WGs are produced by microstructuring the Tm3+:LiYF4/LiYF4 epitaxies via diamond-saw dicing. They are pumped by a RFL based on an erbium master oscillator power amplifier and a GeO2-doped silica fiber and emit polarized output at 1679 nm. A CW in-band-pumped (H63→F43) Tm3+:LiYF4 WG laser generates up to 2.05 W of a linearly polarized single-transverse-mode output at 1881 nm with a slope efficiency of 78.3% and a laser threshold of only 12 mW (versus the absorbed pump power)

In-band pumped Tm,Ho:LiYF4_4 waveguide laser

International audienceA 4.5 at.% Tm, 0.5 at.% Ho:LiYF 4 planar waveguide (thickness: 25 μm) grown by Liquid Phase Epitaxy is in-band pumped by a Raman fiber laser at 1679 nm (the 3 H 6 → 3 F 4 Tm 3+ transition). A continuous-wave waveguide laser generates a maximum output power of 540 mW at 2051nm with a slope efficiency of 32.6%, a laser threshold of 337 mW and a linear laser polarization (π). This represents the highest output power extracted from any Tm,Ho waveguide laser. No parasitic Tm 3+ colasing is observed. The waveguide propagation losses are determined to be as low as 0.19 dB/cm

Tm 3+ and Ho 3+ colasing in in-band pumped waveguides fabricated by femtosecond laser writing

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Ultrafast laser inscribed waveguide lasers in Tm:CALGO with depressed-index cladding

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