6篇
您的检索式：作者名="Walter Perrie"
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| 1 | Diffractive Multi-beam Ultra-fast Laser Micro-processing Using a Spatial Light Modulator(Invited Paper)显示文摘Multi-beam ultra-fast laser parallel microprocessing using spatial light modulation is demonstrated in this paper.Diffractive multi-beam patterns are generated with a spatial light modulator(SLM),which is driven by computer generated holograms(CGHs).The CGHs calculated by appropriate algorithms are displayed on the SLM to split an input laser beam to a number of beamlets and digitally manipulate their positions and intensity.The undesired damage by the energetic zero order beam can be avoided by either installing a 4f optical system to block the zero order at the Fourier plane or adding a Fresnel zone lens on the CGH to defocus the zero order at the processing plane.The surface ablation of materials using multi-beam patterns synchronised with a scanning galvanometer system shows flexible and high throughput parallel processing.By tightly focusing the diffractive beams with an objective into transparent materials,high speed dynamic femto-second laser two-dimensional(2D) and three-dimensional(3D) internal structuring is also presented.The results demonstrate the high precision micro-processing with higher efficiency,showing the potential for ultra-fast laser parallel processing in real industrial applications. | Walter Perrie S. P. Edwardson E. Fearon G. Dearden K. G. Watkins | 2009 | 中国激光2009，36，12： | 4 |
| 2 | Drinking water aluminium and bioavailability 显示文摘 | Steve Reiber Walter Kukull Perri Standisk-Lee | 1995 | J AWWA1995，87，5： | 2 |
| 3 | High speed uniform parallel 3D refractive index micro- structuring of poly(methylmethacrylate) for volume phase gratings显示文摘 | Dun Liu Zheng Kuang Walter Perrie | 2010 | Applied Physics B Lasers and Op- tics2010，101，4： | 1 |
| 4 | Are endometrial polyps true cancer precursors?显示文摘 | Tamar Perri Kurosh Rahimi Agnihotram V. Ramanakumar Karen Wou Dragana Pilavdzic Eduardo L. Franco Walter H. Gotlieb Alex Ferenczy | 2010 | American Journal of Obstetrics and Gynecology2010，，： | 1 |
| 5 | Psf2 plays important roles in normal eye development in Xenopus laevis 显示文摘 | Walter BE Perry KJ Fukui L | 2008 | Mol Vis2008，19，14： | 1 |
| 6 | Two-photon absorption and stimulated emission in poly-crystalline Zinc Selenide with femtosecond laser excitation显示文摘The optical nonlinearity in polycrystalline zinc selenide(ZnSe),excited with 775 nm,1 kHz femtosecond laser pulses was investigated via the nonlinear transmission with material thickness and the Z scan technique.The measured two photon absorption coefficientβwas intensity dependent,inferring that reverse saturated absorption(RSA)is also relevant dur-ing high intensity excitation in ZnSe.At low peak intensity I<5 GW cm^(-2),we findβ=3.5 cm GW^(-1) at 775 nm.The spec-tral properties of the broad blueish two-photon induced fluorescence(460 nm-500 nm)was studied,displaying self-ab-sorption near the band edge while the upper state lifetime was measured to be τ_(e)~3.3 ns.Stimulated emission was ob-served when pumping a 0.5 mm thick polycrystalline ZnSe sample within an optical cavity,confirmed by significant line narrowing fromΔλ=11 nm(cavity blocked)toΔλ=2.8 nm at peak wavelength λ_(p)=475 nm while the upper state life-time also decreased.These results suggest that with more optimum pumping conditions and crystal cooling,polycrystal-line ZnSe might reach lasing threshold via two-photon pumping atλ=775 nm. | Qianliang Li Walter Perrie Zhaoqing Li Stuart P Edwardson Geoff Dearden | 2022 | Opto-Electronic Advances2022，5，1： | 0 |
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