Leslie Laycock

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An enzyme system which converts ornithine to proline was partially purified from extracts of cells of Clostridium botulinum and of Clostridium PA 3670 by fractionation with ammonium sulfate and by dialysis in the presence of 0.01 m ornithine. Nicotinamide adenine dinucleotide (NAD) was the only cofactor required for maximal activity of the partially(More)
We report on recent progress in the field of visible light communications including direct modulation of blue laser devices at data rates beyond 10 Gbit/s, and the transmission of 2.5 Gbit/s OOK data through water. We also discuss the advantages of operating with single mode laser devices and matched filtering at the receiver in the context of applications(More)
Seven hundred and one 10- to 13-year-old schoolchildren from 20 schools in the Hunter region of New South Wales were asked questions about the future. The questionnaire, which was in two main sections, commenced with general, open-ended questions about the children's expectations, hopes and wishes. It then moved to more specific questions which were(More)
A controllable self-Raman laser using an adaptive optics (AO)-based control loop featuring an intracavity deformable mirror is reported. This method has the potential to alleviate thermal lensing within the Raman and laser gain media, and enable solid-state Raman lasers to reach new power levels. A proof-of-concept experiment using a Nd:YVO4 self-Raman(More)
Several adaptive-optics techniques, based on the active modification of the optical properties of the laser cavity, were used to significantly reduce the time-to-full-brightness of solid-state lasers. Resonator re-configuration was achieved using a mechanical translation stage and both multi- and single-element deformable bimorph mirrors. Using these(More)
Fresh extracts of cells of Clostridium botulinum reduced a limited amount of ornithine to delta-aminovaleric acid, but at high substrate concentrations a considerable amount of an amino compound accumulated which was neutral at pH 4.2. Aging of the extracts at -10 C or freezing and thawing resulted in the loss of the ability to produce delta-aminovaleric(More)
A novel ultrashort-pulse laser cavity configuration that incorporates an intracavity deformable mirror as a phase control element is reported. A user-defined spectral phase relation of 0.7 radians relative shift could be produced at around 1035 nm. Phase shaping as well as pulse duration optimization was achieved via a computer-controlled feedback loop.