1,721,016 research outputs found
A 11.5 W Yb:YAG planar waveguide fabricated via pulsed laser deposition
No full textDataset for the figures in Grant-Jacob, James A, Beecher, Stephen J, Parsonage, Tina L, Hua, Ping, Mackenzie, Jacob I, Shepherd, David P and Eason, Robert W (2015) An 11.5 W Yb:YAG planar waveguide laser fabricated via pulsed laser deposition. Optical Materials Express
Data collection method: Optical spectrum analyzer (Ando AQ6317).</span
Characterising energy transfer upconversion in Nd-doped Vanadates at elevated temperatures
No full textThe Energy Transfer Upconversion (ETU) macroparameter is measured for Nd-doped GdVO4 and YVO4 samples at temperatures ranging from Room Temperature (RT) to 450K, by means of a simple and automated z-scan technique. Furthermore, the ground state absorption cross section into the 2H9/2+4F5/2 energy levels is characterised for both crystals over the same range of temperatures. The 808nm pi-polarisation absorption cross section is found to decrease from (58.6+-0.2) pm2 to (30.9+-0.6) pm2 for Nd:YVO4 and (54.0+-0.3) pm2 to (25.7+-0.5) pm2 for Nd:GdVO4, from RT to 450K. Over the same range the ETU coefficient decreases from (3.2+-0.7) e-16 cm3/s to (1.8+-0.4) e-16 cm3/s and (5.0+-0.5) e-16 cm3/s to (3.4+-0.2) e-16 cm3/s for nominally 0.5at.% and 1.0at.% Nd:YVO4 respectively, and (3.3+-0.5) e-16 cm3/s to (0.8+-0.2) e-16 cm3/s and (5.5+-0.5) e-16 cm3/s to (3.1+-0.3) e-16 cm3/s for 0.5at.% and 1.0at.% Nd:GdVO4
Characterising energy transfer upconversion in nd-doped vanadates at elevated temperatures
No full textAll the data displayed in the paper is present in this database with clear reference to the figure and/or the content of the spreadsheet. Units are explicitly stated for every data set and a brief description of the content is present where required.
Dataset supports:
Cante, S., Beecher, S. J., & Mackenzie, J. (2017). Characterising energy transfer upconversion in Nd:YVO4 at elevated temperatures. Paper presented at OSA Laser Congress, Nagoya, Japan.
Cante, S., Beecher, S. J., & Mackenzie, J. (2017). Characterising energy transfer upconversion in Nd-doped Vanadates at elevated temperatures. Optics Express. </span
Characterising energy transfer upconversion in Nd:YVO<sub>4</sub> at elevated temperatures
No full textEnergy Transfer Upconversion and 4F3/2 energy level absorption cross sectionare measured in Nd:YVO4 at temperatures ranging from 300 K to 450 K. The ETU coefficient decreases from (34.5±6.5) x 10-17 cm3/s to (3.0±2.0) x 10-17 cm3/s
Radially-polarised beam amplification in an Yb:YAG thin-slab architecture
No full textRadially-polarised beams are attracting growing interest owing to their unique properties and numerous applications, including materials processing. Power-scaling whilst preserving the polarisation-purity of radially-polarised beams is challenging, with efforts predominantly focused on cylindrically-symmetric systems.We explore an alternative strategy for power-scaling radially-polarised beams using a thin slab amplifier geometry, which, to the best of our knowledge, has not been previously investigated. We show that very high radial polarisation-purity can be maintained in an architecture that can be operated at high powers.A radially-polarised seed-source was constructed using an Yb:YAG rod in a plane-parallel configuration, pumped by a capillary delivery-fiber which provided effective overlap with the LG01 mode. By tuning the cavity length and utilising thermally-induced birefringence, a robust multi-Watt LG01 mode was generated with an excellent radial polarisation-purity of 15dB and good beam quality M2=2.2.The Yb:YAG slab was pumped by a diode-bar producing a highly-elongated inversion region. The seed was amplified in a double-pass configuration, using a cylindrical lens to spatially-match the inversion. The output beam was re-collimated by the cylindrical lens, and compensation for the Gouy phase-shift was made using a half-waveplate.At 50W of incident pump power we obtained a small-signal gain of 7.5dB and a power-gain of 4.5dB for 1.45W seed power. At maximum pump power the radial polarisation-purity was maintained at 15dB, whilst the beam quality was degraded slightly to M2=2.3. Further optimisation of slab design and pump geometry will be discussed in addition to power scaling the system to higher output powers necessary for numerous applications
Dataset for Method for generating high purity Laguerre-Gaussian vortex modes paper
No full textDataset for:
Clarkson, W. et al (2019). Method for Generating High Purity Laguerre-Gaussian Modes. IEEE Journal of Quantum Electronics 55(5).</span
Amplification of a radially-polarised beam in an Yb:YAG thin slab
No full textAmplification of an axially-symmetric, doughnut-shaped radially-polarised beam at 1030nm in a diode-bar-pumped double-pass thin Yb:YAG slab amplifier architecture without degradation in polarisation purity is demonstrated. Preliminary experiments yielded a small-signal gain of 9dB for 50W of incident pump power while maintaining the polarisation purity of the seed beam
Method for generating high purity Laguerre-Gaussian modes
No full textGeneration of a donut-shaped first-order Laguerre-Gaussian (LG01) vortex mode via a method designed to yield high mode purity is reported. Our approach utilises a novel twin-spot end-pumping scheme to directly excite the first order Hermite-Gaussian (HG01) mode in a solid-state laser, followed by a novel astigmatic mode converter based on spherical (concave) mirrors aligned at oblique incidence. A simple theoretical model for the mode converter is derived and from this the design approach is explained along with the potential benefits compared to conventional schemes based cylindrical-lens astigmatic mode converters, particularly for power scaling. As a proof-of-principle and to confirm the benefits of this scheme in terms of high mode purity we have applied it to an end-pumped Nd:YVO4 laser to generate a (LG01) beam with a controllable sense of azimuthal phase and hence orbital angular momentum. A method for characterising the resulting beam based on analysis of the spiral interference pattern derived with the aid of a Mach-Zehnder interferometer is described and yields a value for the LG01 mode purity of 94%. Common sources of mode impurity are identified and the prospects for scaling to higher power whilst maintaining high mode purity are considered
Dataset for direct bonding diamond to zinc selenide
No full textDataset supports:
Stenhouse, H. G., Beecher, S. J., & Mackenzie, J. I. (2017). Direct bonding diamond to zinc selenide. Optical Materials Express, 7(8), 2922-2927. </span
Direct bonding diamond to zinc selenide
Full text linkWe report direct bonding of 5mm dia x 500μm thick polycrystalline CVD-grown diamond to 25mm dia x 4mm ZnSe via a plasma-assisted technique. In addition, diamond to C-cut sapphire bonding is demonstrated via the same approach. Durability of the diamond/ZnSe bond is tested over a temperature range -40 to 150 ºC and under various ramp rates, demonstrating strong adhesion over the majority of the bond up to a temperature of 80 ºC. Optical transmission at a wavelength of 1μm shows near ideal transmission when compared to bare ZnSe. Heatspreading performance of the bonded composite is investigated using a pump-probe arrangement, demonstrating at least two-orders of magnitude reduction in the thermal-lens power compared to ZnSe alone
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