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Optical fiber couplers with ∼300nm waist diameter are used as compact temperature sensors from room temperature to 661oC, showing an average temperature sensitivity of 55 pm/oC and a maximum sensitivity of 60pm/ oC at the highest temperature.
Gd-doped silica and phosphosilicate fibers were pulled from preforms fabricated using the rod-in-tube technique and the solution doping technique, respectively. Ultraviolet (UV)-B luminescence from trivalent Gd at around 312 nm given by transition from first excited state to ground state were observed under deep UV excitations.
Enhancement of photoluminescence (PL) of Gd3+-doped silica glass densified by rapid thermal treatment (RTT) in the ultraviolet (UV) is investigated. The strong emission at 314 nm is assigned to the 6P7/2 to 8S7/2 transition under excitation of 6Dj, 6Ij, and 6Pj energy levels of the Gd3+. Significant decrease of the loss covering the UV band is observed.
We report the fabrication of a multicore fiber attenuator in which the attenuation of each core is independently set using fs-laser inscription. An exemplar 4-core device with ∼1 dB loss-variation between adjacent cores is demonstrated.
A multi-port microcoil resonator magnetic field sensor based on a microfiber coupler coil resonator (MMCR) is presented. The microfiber coupler coil is fabricated by coiling a four-port microfiber coupler with a uniform waist region around a low index support rod. The MMCR is embedded in a low refractive index polymer to increase the robustness and operation stability. The enhanced sensor response...
580μJ nanosecond pulses at a repetition rate of 25kHz with user-defined temporal pulse shapes and a radially polarized doughnut-shaped spatial mode have been demonstrated in an Yb-doped fiber MOPA system seeded by a super-luminescent diode.
A simple technique for directly generating a radially-polarized output beam from an ytterbium-doped fiber laser using an intracavity S-waveplate is reported. The laser yielded 7W of output with a corresponding slope efficiency of 67%.
Ultrashort light pulses create self-assembled sub-wavelength structures in the bulk of silica glass. Recent progress in applications of this phenomenon ranging from polarization and vortex converters to 5D optical data storage is reviewed.
The Femtoprint project uses femtosecond lasers to develop a printer for micro-/nano-scale systems. Femtoprint provides a large community of users with the capability of producing their own micro-systems, in a rapid-manner without the need for expensive infrastructures and specific expertise.
Material processing with ultrafast lasers has attracted considerable interest due to a wide range of applications ranging 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...
Femtosecond laser writing in glass is controlled by the polarization plane azimuth and intensity front tilt of light pulse. Polarization dependent distribution of extraordinary modifications along the light propagation direction is observed.
We demonstrate how femtosecond laser writing can challenge common beliefs in optics. Recently discovered phenomena of quill writing related to self-assembled nanostructuring in glasses and non-reciprocal laser writing in crystals are reviewed.
Anisotropic sensitivity of isotropic medium to femtosecond laser radiation is observed. The phenomenon is explained by unusual anisotropy at the interface produced by ultrashort light pulses with tilted front and referred as ultrafast light blade.
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