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Providing insights into an advanced microscopy technique for polymer-based nanofabrication, this book covers all aspects of the direct laser writing, interpretations in detail of the concept of low one-photon absorption microscopy, as well as single-emitter/photonic devices coupling problems. Starting with the theory of focusing electromagnetic wave, the book goes on to treat various experimentally working conditions, i.e. medium with the mismatched refractive index and absorption, for calculating the intensity distribution at the focusing region. Experimental demonstrations show how a ultra low absorption property opens up a new trend for cost-effective 3D imaging and nanofabrication.