1,721,047 research outputs found
Enhanced light backscattering in thermally poled plasmonic nanocomposite and its application to vapour sensing
No full textWe show theoretically that gold nanoparticles embedded in glass can exhibit enhanced light backscattering in presence of leaky waveguide and report on selective vapour sensing in thermally poled nanocomposite in which this concept is implemented
Efficient conversion to radial polarization in the two-micron band using a continuously space-variant half-waveplate
No full textWe demonstrate efficient conversion of a linearly-polarized Gaussian beam to a radially-polarised doughnut beam in the two-micron band using a continuously space-variant half-waveplate created by femtosecond writing of subwavelength gratings. The low scattering loss (<0.07) of this device indicates that it would be suitable for use with high power lasers
In-fiber devices via laser direct writing
No full textIntense ultrashort light pulses allow modifying material with high spatial precision. This can be effectively exploited for developing various in-fiber devices. Here we will discuss several examples of this approach
High power radially-polarized Yb-doped fiber laser
No full textA simple technique for directly generating a radially-polarized output beam from an ytterbium-doped fiber laser using an intracavity spatially-variant waveplate is reported. The laser yielded 32W of output with a corresponding slope efficiency of 65.8% in a radially-polarised beam with beam propagation factor ~2.1 and polarization purity >95%
Femtosecond laser induced vortex anisotropy
No full textAnisotropic bubble chain structures are produced by ultrashort pulse laser irradiation in silica glass. Vortex anisotropy is observed in the irradiated volume
Ultrafast laser processing of glass: from new phenomena to applications
No full textUltrafast laser processing of glass reveals new phenomena. Reviewed are recent demonstrations of 5D optical memory, vortex polarisation converters employing self-assembled nanostructuring, ultrafast laser calligraphy and polarization writing control using pulses with tilted front
Polarization diffraction grating produced by femtosecond laser nanostructuring in glass
No full textWe demonstrate polarization sensitive diffractive optical element fabrication by femtosecond direct writing in the bulk of silica glass. Modulation of the anisotropic properties is produced by controlling light-induced self-assembled nano-gratings
Beyond conventional 3D ultrafast laser material processing
No full textMaterial processing with ultrafast lasers has attracted considerable interest due to a wide range of applications from laser surgery and integrated optics to optical data storage, 3D micro- and nano-structuring [1,2]. A decade ago it has been discovered that under certain irradiation conditions ordered sub-wavelength structures with features smaller than 20 nm can be formed in the volume of silica glass [3]. The effect of nanograting formation has attracted considerable interest with proposals of applications ranging from nanofluidics [4,5] to polarization control devices [6]
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