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16 Mar 2009

Volume 94, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 94, 111101 (2009); http://dx.doi.org/10.1063/1.3097278 (3 pages)

Ling Lu, Adam Mock, Tian Yang, Min Hsiung Shih, Eui Hyun Hwang, Mahmood Bagheri, Andrew Stapleton, Stephen Farrell, John O’Brien, and P. Daniel Dapkus
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Linear-nonlinear interaction’s effect on the power dependence of nonlinear distortion products

Justin Henrie, Andrew Christianson, and William J. Chappell

Appl. Phys. Lett. 94, 114101 (2009); http://dx.doi.org/10.1063/1.3098068 (3 pages) | Cited 3 times

Online Publication Date: 19 March 2009

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An unusual power dependence of the nonlinear distortion produced by a two-tone test has been observed in several different physical systems. We show that the interaction between the nonlinear and linear elements of a system can dramatically transform the overall nonlinear behavior of the system from that of the nonlinear component in isolation. In particular, we show that when interaction with the linear elements of an electric circuit is appropriately accounted for, rather simple models of nonlinearity display the unusual power dependence of nonlinear distortion products observed in a variety of physical systems.
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84.40.Ua Telecommunications: signal transmission and processing; communication satellites

Superheterodyne detection of laser generated acoustic waves

Suraj Bramhavar, Bruno Pouet, and Todd W. Murray

Appl. Phys. Lett. 94, 114102 (2009); http://dx.doi.org/10.1063/1.3103324 (3 pages) | Cited 6 times

Online Publication Date: 20 March 2009

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A superheterodyne approach to the detection of laser generated acoustic waves is presented. An amplitude modulated laser source is used to generate high frequency, narrow bandwidth acoustic waves, and the resulting surface displacement is detected using a stabilized Michelson interferometer. The detection laser used in the interferometer is amplitude modulated at a frequency that is offset from the generation laser modulation frequency by a fixed amount, allowing for the optical down-conversion of the high frequency intensity modulation associated with acoustic wave propagation to a low and fixed intermediate frequency, thereby obviating the need for high frequency detection electronics. Results are presented demonstrating the approach for the detection of bulk and surface acoustic waves at frequencies of up to 1 GHz.
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43.35.Ud Thermoacoustics, high temperature acoustics, photoacoustic effect
07.60.Ly Interferometers
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