The 3 references with contexts in paper A. Bubulis, V. Jurenas, V. Maciukiene, S. Navickaite, А. Бубулис , В. Юренас , В. Мачюкене , С. Навицкайте (2015) “РАЗРАБОТКА И ИССЛЕДОВАНИЕ НОВОЙ КОНСТРУКЦИИ ПЬЕЗОЭЛЕКТРИЧЕСКОЙ ЗАДВИЖКИ ЛАЗЕРНОГО ЛУЧА // DEVELOPMENT AND INVESTIGATION OF NEW DESIGN PIEZOELECTRIC LASER BEAM SHUTTER” / spz:neicon:pimi:y:2012:i:1:p:41-43

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590, January 6, 1997, Published in the First Korea/U.S.A. Road Workshop Proceedings. – January 28–29, 1997. 2. Bensoe, M.P. On the design of structure and controls for optimal performance of actively controlled flexible structures / M.P. Bensoe, N. Olhoff, J.E. Tatlor // Mech. Struct. & Mach. –Vol. 15. – N. 3 (1987). P. 265–295.
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    (E-mail: algimantas_bubulis@ltu.lt) Keywords: laser beam, shutter, piezoactuator, deformation. Introduction Laser technologies are broadly used in modern equipment. Seeking to control laser beam there are used laser shutting or chopping systems
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    . Laser beam goes without disturbing through laser shutter system, if the shutter is opened, but in that case if the shutter is all or partially closed laser beam is all or partially blocked.

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Fast Laser Shutters With Low Vibratory Disturbances / NASA‘s Jet Propulsion Laboratory. – USA, February 2005.
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    Most laser beam choppers or shutters developed up to date are single resonance frequency based, and while recent efforts have been made to broaden the frequency range of laser beam choppers, what is lacking is a robust tunable frequency technique of the chopper
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    . Shutters differ from choppers in that they are not limited to a simple periodic on-off cycle but will follow an arbitrary, varying pattern of openings and closings [5] . Optical shutters are useful for low frequency chopping, particularly when slow or non-periodic behavior is desired [6, 7].

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Freyhold, T. Miniaturized piezo electric chopper for fiber optical multimode applications realized using LIGA-technology / T. Freyhold [et al.] // Optical MEMS'98, IEEE/LEOS Summer Topical Meetings. – Monterey, Ca, 1998. – P. 75–79.
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    resonance frequency based, and while recent efforts have been made to broaden the frequency range of laser beam choppers, what is lacking is a robust tunable frequency technique of the chopper [4]. Shutters differ from choppers in that they are not limited to a simple periodic on-off cycle but will follow an arbitrary, varying pattern of openings and closings
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    . Optical shutters are useful for low frequency chopping, particularly when slow or non-periodic behavior is desired [6, 7]. The scheme and working principle of the investigated laser beam shutter The investigated new design piezoelectric laser beam shutter consists of piezoactuator 2 that is housed together in the housing device 1.