Hess Peter, Lomonosov Alexey M
Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany.
Ultrasonics. 2010 Feb;50(2):167-71. doi: 10.1016/j.ultras.2009.08.003. Epub 2009 Aug 9.
Recent achievements of nonlinear acoustics concerning the realization of solitons and solitary waves in crystals and their surfaces attained by nanosecond and picosecond laser ultrasonics are discussed and compared. The corresponding pump-probe setups are described, which allow an all-optical contact-free excitation and detection of short strain pulses in the broad frequency range between 10 MHz and about 300 GHz. The formation of solitons in the propagating longitudinal strain pulses is investigated for nonlinear media with intrinsic lattice-based dispersion. The excitation of solitary surface acoustic waves is realized by a geometric film-based dispersion effect. Future developments and potential applications of nonlinear nanosecond and picosecond ultrasonics are discussed.
讨论并比较了非线性声学在通过纳秒和皮秒激光超声实现晶体及其表面的孤子和孤立波方面的最新成果。描述了相应的泵浦-探测装置，该装置可在10 MHz至约300 GHz的宽频率范围内对短应变脉冲进行全光学非接触式激发和检测。研究了具有基于晶格的固有色散的非线性介质中传播的纵向应变脉冲中孤子的形成。通过基于薄膜的几何色散效应实现了孤立表面声波的激发。讨论了非线性纳秒和皮秒超声的未来发展及潜在应用。
