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Abstract. Permanent refractive-index gratings are generated by thermal fixing of holograms in photorefractive lithium niobate channel waveguides. The guides are fabricated by successive indiffusion of titanium stripes and thin layers of copper. After high-temperature recording with green light, refractive-index modulations exceeding ��n=810-5 for light of the telecommunication wavelength 1550nm appear...
Abstract. The new concept of the creation of an acousto-optic tunable filter (AOTF) with super-resolution and small size is discussed. The advantage of the device is based on the use of a novel type of multi reflector beam expander that produces a highly collimated optical beam (angular spread about 100ppm), tilted with a change in optical wavelength. The proposed AOTF, 1cm in length, can have an...
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