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Ultraviolet loss measurements on germanosilicate fibre samples showing an intense absorption, centred at 242 nm, with an associated fluorescence at 413 nm are presented. The first direct observation is reported of the bleaching of this 240 nm band under the action of ultraviolet irradiation, evidence which is consistent with the Kramers-Kronig model for the photosensitive refractive index change in...
Conventional molecular beam epitaxy (MBE) has been used to grow extremely high-quality single quantum wells in the GaInAs/AlInAs materials system. GaInAs wells varying in thickness from 6.7 ? to 122? are clearly resolved in the 4K photoluminescence spectrum. Emission from the narrowest quantum well was observed at 897.3 nm, which we believe is at a shorter wavelength than any previously reported for...
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