Abstract.
We investigate a thermally tunable integrated narrow-bandwidth interference filter for light in the infrared wavelength region around λ=1550 nm fabricated in a channel waveguide in lithium niobate. The filter is based on a holographically recorded and thermally fixed refractive-index Bragg grating. The device is connected to optical single-mode fibers and works polarization-independent. We measure a peak reflectivity of 95% and a linewidth (FWHM) of 0.09 nm. By temperature-controlling the peak wavelength of the filter is tuned. For the linear thermal expansion coefficient of lithium niobate along the c axis the value α33=(4.5±0.5)×10-6 K-1 is obtained. Permanent illumination of the filter with incoherent light allows us to adjust the peak reflectivity.
Dedicated to Prof. K. Ringhofer on the occasion of his 60th birthday.
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Received: 1 April 1999 / Published online: 24 June 1999
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Hukriede, J., Kip, D. & Krätzig, E. Thermal tuning of a fixed Bragg grating for IR light fabricated in a LiNbO3:Ti channel waveguide . Appl Phys B 70, 73–75 (2000). https://doi.org/10.1007/s003400050011
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DOI: https://doi.org/10.1007/s003400050011