Título
Watt-level ultrafast laser inscribed thulium waveguide lasers
Autor(es)
Fecha de publicación
2020-08
Citación
Kifle, E., Loiko, P., Romero, C., Vázquez de Aldana, J. R., Aguiló, M., Díaz, F., Camy, P., Griebner, U., Petrov, V., & Mateos, X. (2020). Watt-level ultrafast laser inscribed thulium waveguide lasers. Progress in Quantum Electronics, 72, 100266. https://doi.org/10.1016/j.pquantelec.2020.100266
Resumen
We report on the first watt-level ultrafast laser inscribed Thulium waveguide (WG) lasers. Depressed-index buried channel WGs with a circular cladding (type III) are produced in monoclinic Tm3+:KLu(WO4)2 crystals. Laser operation is achieved under conventional (3H6 → 3H4) and in-band (3H6 → 3F4) pumping. In the former case, employing a Raman fiber laser emitting at 1679 nm as pump, the continuous-wave Tm channel WG laser generated 1.37 W at 1915–1923 nm with a record-high slope efficiency of 82.7% (with respect to the absorbed pump power), a threshold of only 17 mW and a spatially single-mode output with linear polarization. The WG propagation losses were 0.2 ± 0.3 dB/cm. Passive Q-switching of Tm channel WG lasers is achieved using Cr2+:ZnS and Cr2+:ZnSe saturable absorbers. With Cr2+:ZnS, record-short pulses of 2.6 ns/6.9 μJ at a repetition rate of 8.0 kHz were generated. The developed WGs are promising for compact GHz mode-locked lasers at ~2 μm.
URI
ISSN
0079-6727
DOI
10.1016/j.pquantelec.2020.100266
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