Adaptive optical array receivers for detection of surface acoustic waves

Murray, Todd W.; Tuovinen, Hemmo; Krishnaswamy, Sridhar

doi:10.1364/ao.39.003276

Cited by 24 publications

(6 citation statements)

References 15 publications

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“…As will be considered below, the demodulator based on two-wave mixing in a PR crystal can provide both spectral decoding of FBG-sensor signals and their effective spectral demultiplexing. The spectral shift induced by strain, F , and temperature change, T, in a Bragg-grating sensor can be written as (Murray, et al, 2000):…”

Section: Spectral Multiplexing Of Dynamic Hologramsmentioning

confidence: 99%

Multi-Channel Adaptive Interferometers Based on Dynamic Hologram Multiplexing

Romashko¹,

Kulchin²

2011

Advanced Holography - Metrology and Imaging

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Section: Spectral Multiplexing Of Dynamic Hologramsmentioning

confidence: 99%

Multi-Channel Adaptive Interferometers Based on Dynamic Hologram Multiplexing

Romashko¹,

Kulchin²

2011

Advanced Holography - Metrology and Imaging

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“…There are more alternative ways to detect laser damage such as measurement of fluorescence spectra using CCD camera [10], detecting interference patterns caused by photo-acoustic surface waves by interferometer [11]. Moreover it is possible to detect damage by registering of photo induced electrons of material particles.…”

Section: Other Techniquesmentioning

confidence: 99%

Adaptive laser-induced damage detection

2009

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Laser-Induced Damage Threshold (LIDT) measurements are typically performed in order to characterize the optical resistance of laser components. However the sensitivity of online damage detection techniques is often limiting factor for the accuracy and reproducibility of so called S-on-1 and 1-on-1 measurements. In fact the sensitivity of damage detection has the biggest impact to precision of these experiments. In this paper we describe the idea of making improvements on scattered light registration based damage detection. It was learned, that scattered light intensity is linearly proportional to incident energy of laser pulses while material is not damaged. However in case of induced damage the linear proportionality becomes nonlinear: this feature is used in order to detect optically induced surface and bulk changes in material. According to the base of those theoretical considerations the adaptive scattering detector was proposed and made up. It was put into practice by projecting it on discrete element schematics. The improved sensitivity of laserinduced damage detection was reached. This technique helps to avoid degradation of damaged site and pollution of surrounding area due to laser ablation during the S-on-1 tests since it allows blocking the repetitive irradiation immediately when damage appears. Numerous tests were made, that shows, that adaptive scattering detector can precisely detect damages in their initiation state, independently from material ability of light scattering. Calibration of this detector can be automated, therefore the influence of human factor is minimized. This fact opens up the possibility to run whole damage threshold measurement procedure automatically.

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“…[16][17][18][19] One of the successful approaches to detect SAWs with high sensitivity in harsh circumstances due to high sample surface roughness and high levels of environmental vibrations is photorefractive interferometry. This approach has been mainly implemented for detecting SAW [20][21][22][23][24] or acoustic vibration [25][26][27][28][29] induced displacements at one location on the surface of a sample. Moreover, full-field schemes have also been proposed.…”

Section: Introductionmentioning

confidence: 99%

Imaging of transient surface acoustic waves by full-field photorefractive interferometry

Xiong

Glorieux

et al. 2015

Review of Scientific Instruments

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A stroboscopic full-field imaging technique based on photorefractive interferometry for the visualization of rapidly changing surface displacement fields by using of a standard charge-coupled device (CCD) camera is presented. The photorefractive buildup of the space charge field during and after probe laser pulses is simulated numerically. The resulting anisotropic diffraction upon the refractive index grating and the interference between the polarization-rotated diffracted reference beam and the transmitted signal beam are modeled theoretically. The method is experimentally demonstrated by full-field imaging of the propagation of photoacoustically generated surface acoustic waves with a temporal resolution of nanoseconds. The surface acoustic wave propagation in a 23 mm × 17 mm area on an aluminum plate was visualized with 520 × 696 pixels of the CCD sensor, yielding a spatial resolution of 33 μm. The short pulse duration (8 ns) of the probe laser yields the capability of imaging SAWs with frequencies up to 60 MHz.

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Adaptive optical array receivers for detection of surface acoustic waves

Cited by 24 publications

References 15 publications

Multi-Channel Adaptive Interferometers Based on Dynamic Hologram Multiplexing

Multi-Channel Adaptive Interferometers Based on Dynamic Hologram Multiplexing

Adaptive laser-induced damage detection

Imaging of transient surface acoustic waves by full-field photorefractive interferometry

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