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The detection of ultra high energetic cosmic neutrinos provides a uniquemeans to search for extragalactic sources that accelerate particles to extremeenergies. It allows to study the neutrino component of the GZK cut-off in thecosmic ray energy spectrum and the search for neutrinos beyond this limit. Dueto low expected flux and small interaction cross-section of neutrinos withmatter large experimental set-ups are needed to conduct this type of research.Acoustic detection of cosmic rays may provide a means for the detection ofultra-high energetic neutrinos. Using relative low absorption of sound inwater, large experimental set-ups in the deep sea are possible that are able todetect these most rare events, but it requires highly sensitive hydrophones asthe thermo-acoustic pulse originating from a particle shower in water has atypical amplitude as low as a mPa. It has been shown in characterisationmeasurements that the fibre optic hydrophone technology as designed andrealised at TNO provides the required sensitivity. Noise measurements and pulsereconstruction have been conducted that show that the hydrophone is suited as aparticle detector.

Fibre laser hydrophones for cosmic ray particle detection