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Holmium fibre lasers are required for remote sensing, LIDAR and some medical applications [1]. In addition, pulsed Holmium fibre lasers also offer an attractive power scalable alternative to Ho:YAG and Ho:YLF lasers for pumping mid-infrared optical parametric oscillators (OPOs). In these applications it is necessary to operate at a high peak power (>20 kW) with minimal spectral broadening (<2...
Custom spatial laser profiles such as annular beams have advantages over Gaussian beam profiles for applications including materials processing [1-3], fibre optic communications [4], reduction of nonlinear effects in fibre lasers [5] and optical trapping [6, 7]. Conversion to a desired higher order mode can be done using bulk optics [1-6], however, for some applications a monolithic, integrated solution...
We present novel techniques for the processing of fibre end face and cladding surfaces using a 9.6 μm CO2 laser. We investigate the effects of pulse duration on process parameters.
We fabricated Er-Yb codoped tellurite spheres for strong upconversion WGM lasing with Q up to 27,000 for 15μm diameter and achieved the index sensitivity of 8.8nm/RIU. Strong amplitude modulation in the modes was also observed.
In order to understand the interaction between femtosecond pulses and complex fiber optic taper profiles, measurement of the transmission alone is insufficient. We have developed a new technique that measures the wavelength spectrum, phase and intensity of the reflected femtosecond pulse as a function of position along the fiber optic taper, with a sub-millimeter resolution.
We demonstrate controlled, adiabatic tapering of pressurized bismuth hexagonal microstructured optical fibers, enabling holes of diameters < 300 nm, with controlled collapse, and core sizes < 1 μm using an elliptical CO2 laser beam profile.
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