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TY - UNPB AU - Choporova, Y. AU - Gerasimov, V.V. AU - Getmanov, Ya.V. AU - Knyazev, B.A. AU - Kulipanov, G.N. AU - Shevchenko, O.A. AU - Vinokurov, N.A. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - Recent Advances in Terahertz Photonics and Spectroscopy at Novosibirsk Free Electron Laser J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - The Novosibirsk free electron laser facility (NovoFEL) operates in the spectral range from 5 to 240 micrometer. High power, narrow linewidth and frequency tunability enable a wide variety of experiments. NovoFEL has eleven user stations open to local and external users. In this paper, we survey selected experiments in photonics performed recently at the facility, such as ellipsometry, holography, surface plasmon polaritons study, pump-probe spectroscopy, and the investigation of the Talbot effect. Additionally, this paper will focus on another field of terahertz (THz) photonics, the transformation of (FEL) radiation into modes different from a Gaussian. Optical elements for intense THz waves differ from classical optical elements. Diffractive optical elements (DOEs) become beneficial for beam manipulation. For instance, in biological experiments a uniform irradiation of substances might be necessary; beams with radial polarization may be required in experiments on the generation of plasmons on wires; pencil-like or "nondiffractive" Bessel beams could be applied to radioscopy of extended objects, etc. A brief overview of THz beam transformations with DOEs will be given. PB - JACoW Publishing CP - Geneva, Switzerland ER -