Bulk internal bragg gratings and optical devices

摘要: The present invention provides devices including photosensitive bulk glass bodies (38), containing Bragg gratings (30). Preferably the (38) are batch meltable alkali boro-alumnio-silicate. device comprises an input optical waveguide collimator(20) for collimating light beam (22) from (24) to provide unquided wavelength range bands (μR, μn); internal grating (26) a transparent medium (28) with modulated refractive index (30); at least one output coupler (32) outputting band and substrate structure securing said relative collimator (20) (32), disposed in unguided wherein (μn) is transmitted through wavelenght (μR) reflected by (26).