Photocurable Polymer Composition Based on Heat-Resistant Aromatic Polyamide for the Formation of Optical Elements by Two
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Photocurable Polymer Composition Based on Heat-Resistant Aromatic Polyamide for the Formation of Optical Elements by Two-Photon Polymerization D. V. Ganina, *, D. S. Dudovab, B. S. Shavkutab, d, O. S. Korkunovac, B. Ch. Kholkhoevc, P. S. Timashevb, d, e, f, V. F. Burdukovskiic, and N. V. Minaevb a Physics
Instrumentation Center, Prokhorov General Physics Institute, Russian Academy of Sciences, Troitsk, 108840 Russia b Institute of Photon Technologies, Crystallography and Photonics Federal Scientific Research Center, Russian Academy of Sciences, Troitsk, 108840 Russia c Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, 670047 Russia d Institute for Regenerative Medicine, Sechenov First Moscow State Medical University, Moscow, 119991 Russia e Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 119991 Russia f Department of Chemistry, Moscow State University, Moscow, 119991 Russia *e-mail: [email protected] Received December 11, 2019; revised March 8, 2020; accepted March 28, 2020
Abstract—Optical properties of a polymer composition based on heat-resistant aromatic polyamide are established and an approach to the formation of three-dimensional microoptical structures by two-photon polymerization on the base of this composition is developed. Formation of prototype polymer microoptical elements is proven in several regimes involving a two-photon polymerization system with the use of a laser source with a wavelength of 525 nm. The formed structures corresponded to the initial three-dimensional model, were optically transparent in the range from 450 nm, and preserved optical transparency after several cycles of heating up to 300°C. Keywords: femtosecond laser radiation, multiphoton absorption, two-photon polymerization, 3D-printing, photocurable polymeric compositions, heat-resistant aromatic polyamides DOI: 10.1134/S0030400X20070073
INTRODUCTION The development of new optical devices and appearance of powerful laser sources require creation of complex optical systems with aspherical surfaces which are hard to produce in traditional ways. For example, collimation and focusing of powerful lasers and laser diodes with a complex mode composition requires using expensive spatial light modulators [1] and complex optical systems [2, 3]. The problem can be solved by creation of aspherical optical elements (in particular, micron scale ones [4]) according to a specially calculated computer model [5, 6]. At present, one of new promising methods for creating optical elements are additive technologies which use different transparent photocurable polymer compositions (PPCs) and work on the principle of laser or projection photocuring of polymer materials [7, 8]. Such methods are based on direct single-photon selective photocuring of thin layers of polymeric compositions; by virtue of this (according to the initial computer model), structures with sizes of up to several centimeters are formed layer-by-layer. The disadvan-
tage of this approach in t
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