This paper presents the results of a laser interference microscopy study of the morphology and dynamical properties of myelinated nerve fibres. We describe the principles of operation of the phase-modulated laser interference microscope and show how this novel technique allows us to obtain information non-invasively about the internal structure of different regions of a nerve fibre. We also ana...

The paper describes the impact of selective laser melting factors including using a nanosecond fibre laser, powers, scanning speed, and thickness layer, on relative density micro hardness Vickers IN 601 samples was studied. Selective (SLM) is commonly used powder bed fusion metal additive manufacturing (AM). Recent advances in have attracted significant industrial interest, especially for produ...

AIMS To investigate the effects of artefacts on scanning laser polarimetry of the retinal nerve fibre layer. METHODS Six eyes of six normal volunteers and an artificial nerve fibre layer were examined using the nerve fibre analyser II. The retinal nerve fibre layer thickness (RNFLT) was measured in each of four 90 degree quadrants, superior (S), temporal (T), inferior (I), and nasal (N), at 1...

A photonic crystal vertical-cavity surface-emitting laser with a spectral width of 0.16 nm and a 3dB small signal modulation bandwidth of 16.2 GHz is demonstrated. Separation of optical and current apertures enables a narrow spectral width and an extremely low operating current density of ∼ 1 kA/cm simultaneously. It can potentially be used as a high-reliability laser source that enables error-...

Mode-locked fibre laser as a dissipative system is characterized by rich forms of soliton interaction, which take place via internal energy exchange through noisy background in the presence of dispersion and nonlinearity. The result of soliton interaction was either stationary-localized or chaotically-oscillated soliton complexes, which have been shown before as stand-alone in the cavity. Here ...

A hybrid OFDM-baseband (BB) signal and three-band OFDMwireless channels using the 2.5 GHz bandwidth directly modulated laser and 10 GHz bandwidth electroabsorption modulated laser in a passive optical network (PON) is investigated. Each 16-QAM OFDM wireless and 64-QAMOFDM-BB signals can achieve 11.2 and 15 Gbit/s traffic data rates, respectively, in 20 km fibre transmissions. Moreover, the netw...

Continuing developments in homodyne laser interferometer systems [1] are improving both their measurement performance capability and their ease of installation. This paper gives an overview of such a system and explains several of the key design features. Firstly, an overview of the optical detection scheme is given. Secondly, a novel method for improving the Sub Divisional Error (SDE) in a Col...

In this paper we present an in-ground intrusion detection system for security applications. Here, an optical fibre pressure switch is directly connected to a standard digital input of a programmable logic controller (PLC). This is achieved using an intensiometric detection system, where a laser diode and Fibre Bragg Grating (FBG) are optically mismatched, resulting in a static dc offset from th...