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The general ring laser operation model is adopted for the large gyroscopes C-II and G. An extended set of auxiliary sensors information is used for the long time period data modeling and ring laser behavior analysis with respect to the ideal case. Both instrumental errors and orientational effects are estimated and compensated where possible. The instrumental stability improved approximately for one order of magnitude for timeseries with duration of up to 70 days. This makes small periodic signals of geophysical interest accessible in the presence of instrumental drift. Basic considerations for the application of ring laser in seismology are presented. The design principles of the GEOsensor, a rotational measurement system for seismology, are demonstrated along with a comparison of rotational seismograms taken from different ring lasers as a proof of concept. The various Sagnac frequency extraction methods are analyzed and compared. As a result the key technology for obtaining rotational seismograms developed. The appropriate data acquisition approach has been chosen with respect to the requirements in seismology and is described. The procedures of the GEOsensor ring laser component installation, beam path alignment and experimental setup are described. The comparison of the GEOsensor data with rotational signal from G and linear signal from standard seismometer are provided. The value of the GEOsensor as a complex stand-alone seismological station is discussed. Für die Korrektur der Rohmessungen der großen Ringlaser C-II und G wird das allgemeine Ringlasermodell verwendet. Über die Messung zusätzlicher Systemparameter konnten verschiedene Freiheitsgrade des Ringlasermodells weiter eingegrenzt werden. Damit ist in der Modellausgleichung eine Verringerung der Sensordrift von ca. 1 Größenordnung für Zeitreihen von bis zu 70 Tagen Länge erzielt worden. Somit werden auch noch kleine Signale von geophysikalischem Interesse in Anwesenheit von instrumenteller Drift zugänglich. Grundlegende Betrachtungen für die Anwendung von Ringlasern in der Seismologie werden dargestellt. Daraus leitet sich ein Sensorkonzept für einen Rotationssensor in der Seismologie ab, welches hier beschrieben wird.