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We present a novel MEMS application aimed at laser based gas sensing. A low-cost MEMS based external intensity modulator for a laser diode source has been realised and applied to photoacoustic spectroscopy. By using a MEMS based modulator, pure intensity modulation of the laser emission is achieved without the accompanying wavelength modulation which occurs with diode current modulation. This reduces...
Ultrasound is a valuable tool for the detection of damage in structures and the characterization of material properties. Its detection is conventionally done by piezoelectric transducers, however fiber-optic sensors can operate over a greater range of frequencies and also yield information on the direction of wave propagation. The interaction between fiber sensors and ultrasound both demonstrates...
The evanescent field coupling between a singlemode optical fibre, side polished close to the core and a high index, multimode, planar waveguide overlay has been investigated as a means of realising inline modulators without interruption of the fibre. Oils of known refractive index and thin layers of polished lithium niobate have been used in the role of the overlay and an electro-optic inline intensity...
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