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2The 30th International Conference on Advanced Laser Technologies
ALT'23
P-I
Prof. Vladimir Pavelyev Samara University, Samara, Russia
Title: Control of characteristics of high-power terahertz laser beams by methods of diffractive optics
Abstract
Technologies for silicon and diamond transmissive diffractive microoptics have been developed [1-6]. Silicon and diamond diffractive optical elements (DOE) for focusing terahertz laser beam [1-3] as well for formation of terahertz laser beam with predetermined mode composition [4] and polarization state [5] have been manufactured and experimentally investigated. Developed technologies are based on lithographic etching [1,4,5] and laser ablation [2,3]. The experiments were carried out at a wavelength of 130-150 ^m using the Novosibirsk Free Electron Laser [6].
The generation of power terahertz beams with pre-given characteristics paves the way for the development of new applications. In [7] it was shown that the diffraction of a generated Bessel beam [4] by a periodic two-dimensional grating in the Talbot planes results in the formation of periodic gratings of annular microbeams. Another application was demonstrated in [8], where beams with orbital angular momentum generated by the DOEs described in [4] were used to excite vortex surface plasmon polaritons propagating along a cylindrical conductor for a distance of up to 150 mm.
In this talk, the fabrication of photonic elements for far terahertz and millimeter ranges is considered. Perspectives of 3D printing application [9] for the fabrication of photonic crystals in terahertz and millimeter ranges are considered. Besides, technologies for reflective terahertz free-form optics fabrication are considered [10].
The experiments were carried out at the Novosibirsk Free Electron Laser Facility, which is part of "the Siberian Synchrotron and Terahertz Radiation Center"..
