Optical Materials Express · 2017 · 29 citations · 33 references
Natural SciencesMaterials EngineeringMaterials ScienceOptical MaterialsOpticsPhotonicsLaser OpticsLaser PhysicsLaser SpectroscopyOptical WaveguidesRaman SpectroscopyUltrafast OpticsContinuous-wave LasersCrystalline StructureFemtosecond Laser PulsesLaser CladdingLaser ThresholdWaveguide FabricationWaveguide LasersWavelength Tuning
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.
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Writing waveguides in glass with a femtosecond laser
K.M. Davis, Kiyotaka Miura, Naoki Sugimoto et al. · Optics Letters · 1996 · 2.6K citations
Natural Sciences, Materials Engineering, Materials Science +17