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´Digital In-line Holographic Microscope for Ice Crystals´ originates from the dissertation of Peter Amsler. The purpose of the doctorate was to improve the knowledge of the optical properties of cloud constituents and hence of the clouds themselves. A special interest lied and still lies on the different habits of ice crystals and their ability to depolarise light. Therefore, there was a need for an imaging system capable of displaying 2 or even 3 D shapes of hydrometeors. In this work, the way from general considerations towards the building of the instrument is described in the first 4 chapters. Chapter 5 depicts the necessary steps towards testing thoroughly the imager and results displaying the role of ice crystal shape and number distributions in a certain environment are shown in chapter 6 and 7. The last sections comprise a short consideration about the multidimensional characteristic of holographic imagers.

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Peter Amsler, born 1972, made an apprenticeship as audio- videoengineer, before studying physics at ETH Zurich.After this, he was awarded a doctorate at the Institute forAtmospheric- and Climate Science at ETH Zurich to the theme´Digital Holographic Microscopes for Ice Crystals´.

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