Results 61 to 70 of about 253,553 (277)
Holographic imaging of cylindrical ultrasonic waves
Archives of Acoustics, 2014 This report is devoted to the visualisation of standing cylindrical ultrasonic wave, generated by a radially vibrating piezoelectric shell, by means of time-average holographic interferometry. The theoretical basis of this technique was introduced, and
L. Grulkowski, D. Jankowski, P. Kwiek
doaj
Annular interdigital transducer focuses piezoelectric surface waves to a single point
, 2007 We propose and demonstrate experimentally the concept of the annular interdigital transducer that focuses acoustic waves on the surface of a piezoelectric material to a single, diffraction-limited, spot.
Abdelkrim Khelif +6 more
core +3 more sources
Advanced Optical Materials, EarlyView.This study presents the replication of micro‐optics fabricated by two‐photon polymerization grayscale lithography via electroplating and injection molding, enabling mass production without loss of precision. A diffractive aspherical micro‐lens array is fabricated and replicated, and its performance is compared before and after replication ...
Stefan Wagner +7 more
wiley +1 more source
Archives of Acoustics, 2013 The 11th School on Acousto-optics and its Appli- cations was held during the ICU’2011 – Interna- tional Congress on Ultrasonics’2011, Gdansk, Poland, 5–8 September 2011, incorporated within the Congress as one of the six structured sessions named as
B. B. J. LINDE, A. ŚLIWIŃSKI
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Recent Advances in χ(2)‐Based Nonlinear Frequency Conversion of Fiber Lasers
Advanced Photonics Research, EarlyView.Visible and mid‐infrared fiber lasers, enabled by nonlinear frequency conversion of fiber lasers, offer several advantages such as high efficiency, excellent wavelength tunability, high power, and superior beam quality that are highly desirable for practical applications. This study provides a comprehensive review of recent research progress in the χ(2)
Bing Han +10 more
wiley +1 more source
Enhanced Sensitivity of Silicon-Photonics-Based Ultrasound Detection via BCB Coating
IEEE Photonics Journal, 2019 Ultrasound detection via silicon waveguides relies on the ability of acoustic waves to modulate the effective refractive index of the guided modes. However, the low photo-elastic response of silicon and silica limits the sensitivity of conventional ...
Resmi Ravi Kumar +5 more
doaj +1 more source
Sensors, 2022 Frequency combs (FCs)—spectra containing equidistant coherent peaks—have enabled researchers and engineers to measure the frequencies of complex signals with high precision, thereby revolutionising the areas of sensing, metrology and communications and ...
Ivan S. Maksymov +3 more
doaj +1 more source
Generalized Heterodyne Interferometry in Kerr Materials
Advanced Photonics Research, EarlyView.Interferometry, combined with heterodyne detection, enables simultaneous measurement of light amplitude and phase. This work applies these methods to study nonlinear phase shifts from the optical Kerr effect during laser pulse propagation. Results show the nonlinear index is straightforward to retrieve at low phases, but at higher powers, pulse shape ...
Arnaud Rogemont +3 more
wiley +1 more source
Nanomaterials, 2021 Wide-range continuous spatial variation of the film composition in lateral compositionally graded epitaxial films requires the development of high throughput measurement techniques for their local and non-destructive characterization with the highest ...
Sathyan Sandeep +7 more
doaj +1 more source
Modal Theory of Phase‐Modulated and Frequency‐Shifting Ring Cavities
Advanced Photonics Research, EarlyView.We present a theoretical and experimental characterization of the optical modes of dispersionless ring cavities with phase modulators or frequency shifters. Their response to arbitrary modulation acts as a filter for phase‐modulated modes that determine the optical output of passive resonators and lasers. This provides a general framework for analyzing
Miguel Cuenca +2 more
wiley +1 more source