Detection of ultrafast phenomena by use of a modified Sagnac interferometer

Hurley, David H.; Wright, Oliver B.

doi:10.1364/ol.24.001305

Cited by 114 publications

(80 citation statements)

References 12 publications

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“…The present interferometer design is related to a timedomain Sagnac interferometer first developed for monitoring picosecond longitudinal acoustic pulses in solids 24 and then applied to SAW imaging. 5 Sagnac interferometers, inherently of common-path design with no moving parts, have the advantage of mechanical stability.…”

Section: A Optical Interferometermentioning

confidence: 99%

“…It is, however, in general also possible to work with much longer values of ␦ , timing the first probe pulse to always arrive before each pump pulse and the second probe pulse after; 24,[41][42][43] in this case one can approximate r 1 as a time-independent quantity. ͑Alternatively, if desired, the interval ␦ can be scanned.͒ The present interferometer design ͑configuration A͒ has the advantage that it is possible to adjust ␦ to an arbitrarily small value by simple axial displacement of mirrors M1 or M2.…”

Section: -3mentioning

confidence: 99%

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Scanning ultrafast Sagnac interferometry for imaging two-dimensional surface wave propagation

Tachizaki

Muroya

Matsuda

et al. 2006

Review of Scientific Instruments

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139

110

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We describe an improved two-dimensional optical scanning technique combined with an ultrafast Sagnac interferometer for delayed-probe imaging of surface wave propagation. We demonstrate the operation of this system, which involves the use of a single focusing objective, by monitoring surface acoustic wave propagation on opaque substrates with picosecond temporal and micron lateral resolutions. An improvement in the lateral resolution by a factor of 3 is achieved in comparison with previous setups for similar samples.

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Section: A Optical Interferometermentioning

confidence: 99%

Section: -3mentioning

confidence: 99%

Scanning ultrafast Sagnac interferometry for imaging two-dimensional surface wave propagation

Tachizaki

Muroya

Matsuda

et al. 2006

Review of Scientific Instruments

Self Cite

139

110

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show abstract

“…These techniques make use of very short stress pulses, generated by thermoelastic deformation of the surface irradiated by an ultrashort optical pulse, that propagate across the specimen and are subsequently detected by another optical probing pulse after a controlled delay. The detection principle is usually the change in the specimen optical reflectivity (Thomsen et al 1986;Rossignol et al 2005;Vollmann et al 2002), although the change in the surface slope (OBD) (Wright and Kawashima 1992) and interferometric detection (Hurley and Wright 1999) have also been reported. The fine achievable temporal resolution (of the order of picoseconds), lateral resolution (of the order of micrometers), and the specific and expensive equipment needed make these techniques especially adequate for characterizing microstructures and thin films in laboratory, but not well-suited for macroscopic industrial inspection where the temporal and spatial scales are much larger.…”

Section: Laser Velocimetrymentioning

confidence: 99%

Video Ultrasonics by Pulsed TV Holography: A New Capability for Non-Destructive Testing of Shell Structures

Fernández

Doval

Trillo

et al. 2007

International Journal of Optomechatronics

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We present a novel capability of the TV holography technique applied to the non-destructive testing of mechanical parts or structures with the form of a plate or a shell, which consists of the recording of high quality synthetic movies of the spatio-temporal evolution of instantaneous ultrasonic displacement fields of the surface under inspection. Moreover, in the case of narrowband acoustic excitation, movies of the spatio-temporal evolution of the acoustic amplitude and of the total acoustic phase can also be generated. Some examples of the application of the technique to flaw detection in aluminium plates using surface waves are presented. As a previous step for evaluating the context and the advantages of the new capability presented, a description of the state of the art with a comparative analysis about non-destructive testing techniques based on optical probing of ultrasound, focused on shell structures, is included in the first part of this article.

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“…For the gold film and probe wavelength used, ⌬ is only sensitive to the out-of-plane surface motion. 14 We therefore express our data in terms of the calibrated difference in surface displacement ⌬u z ϭ ⌬ /4 recorded by the two probe pulses ͑that is effectively averaged over the probe beam spatial profile͒. This difference ⌬u z is proportional to the outward surface particle velocity v z ϭ‫ץ‬u z /‫ץ‬t, where v z Ϸ⌬u z / ͑since Ӷ2 / , where is the phonon angular frequency͒.…”

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confidence: 99%

Direct access to the dispersion relations of multiple anisotropic surface acoustic modes by Fourier image analysis

Sugawara

Wright

Matsuda

2003

Applied Physics Letters

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We present a method based on a combination of temporal and spatial Fourier image analysis, involving the incorporation of a time-reversed acoustic propagation component, that can be used to obtain the angular dispersion or general dispersion relations of multiple surface acoustic modes excited by a localized pulsed source. The method is applied to the study of acoustic propagation at the surface of the highly anisotropic single-crystal TeO 2 coated with a thin gold film. © 2003 American Institute of Physics. ͓DOI: 10.1063/1.1602151͔ Surface acoustic wave propagation on bulk materials and thin film structures has proved of fundamental and practical interest for studying anisotropy and measuring film thicknesses or elastic properties. 1-6 A common method for such investigations is to use plane acoustic wave fronts, and to repeat the experiment for each propagation direction sequentially. However, the imaging of acoustic waves emanating from a point source is very useful for materials characterization because phenomena dependent on propagation direction, such as surface phonon focusing, can be effectively and immediately recorded with an omnidirectional acoustic wave vector distribution. [7][8][9][10][11] For surface acoustic imaging with impulsive point sources, the group velocity is readily measured from the wave front shape. However, it is the phase velocity-or its reciprocal, the slowness-that is more directly related to material elastic properties. 12 Impulsive point-source acoustic excitation of anisotropic samples by nature involves the generation of several surface and bulk acoustic modes that can produce complex overlapping wave fronts; no general method for the direct and automatic extraction of the individual dispersion relations ͑and hence the phase velocities͒ from such experimental images involving multiple propagating modes traveling parallel to the surface has been proposed. Previous methods can only be applied to images where only one acoustic mode propagates in any particular direction. 9 In this letter we present a general technique for analysis in time-resolved acoustic imaging at surfaces in the two lateral spatial dimensions that allows the extraction of the full set of dispersion relations for all excited modes simultaneously.We demonstrate the method with experiments on the transparent tetragonal crystal TeO 2 cut in the ͑001͒ orientation and coated with a thin polycrystalline gold film of thickness ͑40 nm͒ small enough to avoid significant thin film dispersion here and thus simplify comparison with theory. This crystal is strongly anisotropic in this cut and results in a complex phonon focusing pattern, ideal for evaluating techniques for acoustic mode analysis. 9, 13 We use an ultrafast optical pump and probe technique based on a common-path interferometer. 14 Acoustic waves are thermoelastically excited at a ϳ4 m Gaussian spot ͑full width at half maximum intensity͒ in the sample using optical pulses normally incident from the substrate side at wavelength 415 nm, repetition rate 80 MHz, du...

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Detection of ultrafast phenomena by use of a modified Sagnac interferometer

Cited by 114 publications

References 12 publications

Scanning ultrafast Sagnac interferometry for imaging two-dimensional surface wave propagation

Scanning ultrafast Sagnac interferometry for imaging two-dimensional surface wave propagation

Video Ultrasonics by Pulsed TV Holography: A New Capability for Non-Destructive Testing of Shell Structures

Direct access to the dispersion relations of multiple anisotropic surface acoustic modes by Fourier image analysis

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