Superheterodyne detection of laser generated acoustic waves

Bramhavar, Suraj; Pouet, Bruno; Murray, Todd W.
March 2009
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p114102
Academic Journal
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.


Related Articles

  • A tunable, double-wavelength heterodyne detection interferometer with frequency-locked... Gelmini, E.; Minoni, U.; Docchio, F. // Review of Scientific Instruments;Aug1995, Vol. 66 Issue 8, p4073 

    Presents a double heterodyne interferometric instrument using a tunable synthetic wavelength for the absolute measurements of distance and position. Generation of optical synthetic wavelength by a pair of Nd:YAG lasers; Development of the electronic circuit; Demodulation of the superheterodyne...

  • Analysis of surface acoustic wave propagation on a cylinder using laser ultrasonics. Clorennec, D.; Royer, D. // Applied Physics Letters;6/23/2003, Vol. 82 Issue 25, p4608 

    This letter shows an unexpected phenomenon for surface acoustic waves (Rayleigh waves) propagating on a solid cylinder. It was observed that a short Rayleigh wave pulse was reversed during its propagation. In experiments on duraluminum and steel cylinders, transient surface acoustic waves were...

  • Characterization of energy trapping in a bulk acoustic wave resonator. Kokkonen, Kimmo; Meltaus, Johanna; Pensala, Tuomas; Kaivola, Matti // Applied Physics Letters;12/6/2010, Vol. 97 Issue 23, p233507 

    Acoustic wave fields both within the active electrode area of a solidly mounted 1.8 GHz bulk acoustic wave resonator, and around it in the surrounding region, are measured using a heterodyne laser interferometer. Plate-wave dispersion diagrams for both regions are extracted from the measurement...

  • Phase variation of focused surface acoustic wave. Jen, C. K.; Cielo, P.; Bussiere, J.; Nadeau, F.; Farnell, G. W. // Applied Physics Letters;2/1/1985, Vol. 46 Issue 3, p241 

    Converging and diverging surface acoustic waves (SAW) have been generated and detected using a noncontacting method. A yttrium aluminum garnet laser together with an axicon lens produces a focused optical ring which excites both converging and diverging SAW on the test sample. An optical...

  • Wavelength tuning of 1/2-rational harmonically mode-locked pulses in a cavity-dispersive fiber laser. Zhao, Y.; Shu, C.; Chen, J. H.; Choa, F. S. // Applied Physics Letters;12/14/1998, Vol. 73 Issue 24 

    We investigate electrical wavelength tuning of a cavity length dispersive fiber ring laser operated in the 1/2-rational harmonic mode-locking condition. By changing the modulator frequency around the optimum mode-locking frequency, a tuning range of 10.45 nm with a tuning rate of 0.067 nm/kHz is...

  • The Frequency Range of an Optical Receiver in the Registration of Surface Acoustic Waves. Bazylev, P.; Lugovoi, V. // Measurement Techniques;Dec2014, Vol. 57 Issue 9, p1082 

    The upper limit of the frequency range of a broadband optical receiver of surface acoustic waves based on a two-beam laser interferometer and depending on the diameter of the laser beam in the reception area on the sample surface is determined theoretically and experimentally. It is shown that...

  • Rock property assessment using laser-generated acoustic waves. Hutchins, D. A.; Young, R. P. // Review of Scientific Instruments;Aug1991, Vol. 62 Issue 8, p1995 

    A pulsed laser has been used to generate wide bandwidth acoustic pulses in a range of rock samples in the laboratory. A nonresonant piezoelectric transducer was used as the detector. This system can measure longitudinal and shear wave velocities simultaneously, from a single waveform, and can...

  • Enhanced laser generation of surface acoustic waves by discontinuities. Yan, Z.; Nagy, P. B. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p204 

    Laser generation of surface acoustic waves can be enhanced when the irradiated spot covers a surface crack. Experimental methods and simplified models are used to study how the amplitude, directivity, and spectrum of laser-generated surface waves depend on the size of the discontinuity. The...

  • Laser generation and detection of surface acoustic waves: Elastic properties of surface layers. Neubrand, A.; Hess, P. // Journal of Applied Physics;1/1/1992, Vol. 71 Issue 1, p227 

    A noncontact all-optical method for surface photoacoustics is described. The surface acoustic waves (SAWS) were excited employing a KrF laser and detected with a Michelson interferometer using a 633-nm HeNe laser. Due to an active stabilization scheme developed for the interferometer a surface...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics