MIMOW. Wellenlaengenstabilisierung von Strahlungsquellen fuer interferometrische Sensoren Abschlussbericht

Abstract

An integrated-optical wavelength sensor for detecting wavelength shifts of light sources as laserdiodes, superluminescentdiodes and Nd:YAG lasers is reported. The output signal can be used to stabilize the light source. The basic element of the integrated-optical wavelength sensor is an asymmetric Mach-Zehnder-interferometer. The amount of its phase sensitivity is determined by the path length difference between the interferometer arms. Because of the temperature dependence of the effective refractive index and the thermal expansion of the substrate, the sensor also shows a temperature sensitivity. For the realization of a special sensor application, e.g. wavelength sensor, the compensation of thermally induced phase shifts would be desirable. Thus purpose requires some difference of the thermal coefficients. Based on the electro-optic material LiNbO_3 and the waveguide fabrication technique of annealed proton-exchange (APE) a methode was developed to compensate thermally induced phase shifts. It was shown that the temperature compensation can be reached by insertion of a not annealed (PE) segment with another thermo-optic coefficient than the annealed proton-exchanged channel waveguide. (orig.)SIGLEAvailable from TIB Hannover: F00B583+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman