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Título
Femtosecond-laser-written hexagonal cladding waveguide in Tm:KLu(WO_4)_2: µ-Raman study and laser operation
Autor(es)
Materia
Channeled waveguides
Femtosecond laser writing
Laser beams
Laser modes
Laser operation
Waveguide lasers
Fecha de publicación
2017-12
Citación
Esrom Kifle, Pavel Loiko, Xavier Mateos, Javier Rodríguez Vázquez de Aldana, Airan Ródenas, Uwe Griebner, Valentin Petrov, Magdalena Aguiló, and Francesc Díaz, "Femtosecond-laser-written hexagonal cladding waveguide in Tm:KLu(WO4)2: µ-Raman study and laser operation," Opt. Mater. Express 7, 4258-4268 (2017)
Resumen
We report on the fabrication, µ-Raman characterization, and continuous-wave laser operation of a channel waveguide with a hexagonal optical-lattice-like cladding fabricated in monoclinic Tm:KLu(WO4)2 crystal by femtosecond direct laser writing. µ-Raman spectroscopy indicates preservation of the crystalline quality in the core region and an anisotropic residual stress field. When pumped by a Ti:Sapphire laser at 802 nm, the Tm:KLu(WO4)2 buried channel waveguide laser generated 136 mW at 1843.7 nm with a slope efficiency of 34.2% and a threshold as low as 21 mW, which are the record characteristics for femtosecond-laser-written Tm crystalline waveguide lasers. The variation of the output coupling resulted in discrete wavelength tuning of the laser emission from 1785 to 1862 nm. The propagation losses in the waveguide are ~1.2 ± 0.3 dB/cm.
URI
DOI
10.1364/OME.7.004258
Colecciones
- ALF. Artículos [297]
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