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We present a THz investigation of histo-pathological samples including the larynx of a pig and a human liver with metastasis. Our measurements show that different types of tissue can be clearly distinguished in THz transmission images, either within a single image or by a comparison of images obtained for different frequency windows. This leads to the problem that images obtained for different frequencies inherently have a different spatial resolution. An image obtained from two such images by a simple mathematical operation may contain artefacts. We discuss measures to deal with this problem. Furthermore, we investigate the possibility of improving the spatial resolution of THz images. Finally, we present a cw THz imaging system based on a photomixer and an external cavity semiconductor laser that allows for simultaneous two-mode operation. The cw system is less expensive and more compact than conventional time-domain imaging systems.

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1 o confidence level. below 2.7-10*4 by the present experiment. These limits are given at a dilatation factor. The fourth order limit of this deviation is set sets a second order limit of 1.1·10'6 for any deviation from the time of v = 6.4% c. A precision of AV/V < 9.1O·9 has been obtained, which as a test of the time dilatation factor Y = (1-{32)*1/2 at an ion velocity 7Li+ the Doppler shift has been measured by saturation spectroscopy theory of relativity. With an optical A type three level system of allows for precision experiments testing the limits of the special Laser spectroscopy at the heavy ion storage ring TSR in Heidelberg ABSTRACT GSI, Darmstadt