Abstract: A composite all optical-fibre based tapered photonic waveguide (110) including a single or multiple secondary waveguides (120) within or around a primary waveguide (118) is described. The composite optical fibre may also be termed a beam tailoring optical fibre (BT Fibre) (110). In use, at thelarger secondary end (114) both the primary waveguide (118) and the secondary waveguide/s (120) may guide modes at a particular wavelength. However, at the same wavelength, adiabatically tapering down the waveguides (118, 120) reduces the dimensions of the secondary waveguide/s (120) such that all the secondary waveguide/s (120) become effectively non-guiding at the smaller primary end (112), whilst the primary waveguide (118) still guides. In other words, the composite optical fibre is a spatially modulating optical fibre (110).

Abstract: A dosimeter for radiation fields is described. The dosimeter includes a scintillator a light pipe having a first end in optical communication with the scintillator and a light detector. The light pipe may have a hollow core with a light reflective material about the periphery of the hollow core. The dosimeter may further include a light source that generates light for use as a calibrating signal for a measurement signal and/or for use to check the light pipe.

Abstract: A dosimeter for radiation fields is described. The dosimeter includes a scintillator a light pipe having a first end in optical communication with the scintillator and a light detector. The light pipe may have a hollow core with a light reflective material about the periphery of the hollow core. The dosimeter may further include a light source that generates light for use as a calibrating signal for a measurement signal and/or for use to check the light pipe.

Abstract: A dosimeter for radiation fields is described. The dosimeter includes a scintillator a light pipe having a first end in optical communication with the scintillator and a light detector. The light pipe may have a hollow core with a light reflective material about the periphery of the hollow core. The dosimeter may further include a light source that generates light for use as a calibrating signal for a measurement signal and/or for use to check the light pipe.

Abstract: The present disclosure provides in a first aspect a mode-locked laser for generating laser pulses. The mode-locked laser comprises an optical coupler and a first optical path capable of carrying optical signals from and to the optical coupler. The first optical path includes an optical amplifier that is arranged so that saturation of optical amplification causes amplitude modulation of the light. The optical amplifier has a saturation time that is shorter than a pulse transition period of the mode-locked laser and is arranged for recovery of amplifying properties after the saturation within a period of time that is shorter than the pulse transition period of the mode-locked laser. The laser further comprises a second optical path capable of carrying optical signals from and to the optical coupler. The second optical path includes an optical isolator.

Abstract: The present disclosure provides in a first aspect a mode-locked laser for generating laser pulses. The mode-locked laser comprises an optical coupler and a first optical path capable of carrying optical signals from and to the optical coupler. The first optical path includes an optical amplifier that is arranged so that saturation of optical amplification causes amplitude modulation of the light. The optical amplifier has a saturation time that is shorter than a pulse transition period of the mode-locked laser and is arranged for recovery of amplifying properties after the saturation within a period of time that is shorter than the pulse transition period of the mode-locked laser. The laser further comprises a second optical path capable of carrying optical signals from and to the optical coupler. The second optical path includes an optical isolator.

Abstract: A dosimeter for radiation fields is described. The dosimeter includes a scintillator a light pipe having a first end in optical communication with the scintillator and a light detector. The light pipe may have a hollow core with a light reflective material about the periphery of the hollow core. The dosimeter may further include a light source that generates light for use as a calibrating signal for a measurement signal and/or for use to check the light pipe.

Abstract: A dosimeter (100) for radiation fields is described. The dosimeter includes a scintillator (1) a light pipe (2) having a first end in optical communication with the scintillator (1) and a light detector (6). The light pipe (2) may have a hollow core (3) with a light reflective material about the periphery of the hollow core (3). The dosimeter (100) may further include a light source (61) that generates light for use as a calibrating signal for a measurement signal and/or for use to check the light pipe (2).

Abstract: A dosimeter (100) for radiation fields is described. The dosimeter includes a scintillator (1) a light pipe (2) having a first end in optical communication with the scintillator (1) and a light detector (6). The light pipe (2) may have a hollow core (3) with a light reflective material about the periphery of the hollow core (3). The dosimeter (100) may further include a light source (61) that generates light for use as a calibrating signal for a measurement signal and/or for use to check the light pipe (2).

Abstract: An optical waveguide in the form of an optical fibre (10) having at least one longitudinally extending light guiding core region (11) composed at least in part of a polymeric material, a longitudinally extending core-surrounding region (12) composed of a polymeric material, and a plurality of light confining elements (15), such as, for example, channel-like holes, located within the core surrounding region. The light confining elements extend in the longitudinal direction of the core region and are distributed about the core region, and at least a majority of the light confining elements having a refractive index less than that of the polymeric material from which the core-surrounding region is composed. A preform for use in manufacture of the optical waveguide is also disclosed.

Abstract: An optical waveguide in the form of an optical fibre (10) having at least one longitudinally extending light guiding core region (11) composed at least in part of a polymeric material, a longitudinally extending core-surrounding region (12) composed of a polymeric material, and a plurality of light confining elements (15), such as, for example, channel-like holes, located within the core surrounding region. The light confining elements extend in the longitudinal direction of the core region and are distributed about the core region, and at least a majority of the light confining elements having a refractive index less than that of the polymeric material from which the core-surrounding region is composed. A preform for use in manufacture of the optical waveguide is also disclosed.

Abstract: An optical fibre (1) having at least one longitudinally extending light guiding core region (11), a longitudinally extending core-surrounding region (12), and a plurality of light confining elements (15, 16, 17, 18), such as, for example, channel-like holes, located within the core-surrounding region (12). The light confining elements (15, 16, 17, 18) extend in the longitudinal direction of the core region and are located geometrically in zones that surround the core region. The aggregate cross-sectional area defined by the light confining elements within the respective zones increases with increasing radial distance of the zones from the core region. A preform for use in manufacture of the optical fibre is also defined.

Abstract: A method of inducing or enhancing the electro-optic properties of an optically transmissive material such as an optical fiber (1) which comprises applying an electric field by means of electrodes (4) to the optical fiber and subjecting the material to UV radiation (9).