Topic
Laser Doppler vibrometer
About: Laser Doppler vibrometer is a research topic. Over the lifetime, 6319 publications have been published within this topic receiving 76068 citations.
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31 citations
TL;DR: In this article, the frequency stabilisation of a Nd:YAG laser at 946 nm to the Hertz-level was reported, which was used for ultra-high resolution spectroscopy of the 5 s 2 1 S 0 − 5 s5p 3 P 0 transition in In+ and will ultimately serve as a local oscillator of an optical frequency standard based on a single trapped indium ion.
31 citations
Patent•
24 Mar 1999
TL;DR: In this article, a laser anneal device consisting of an oscillator 3 which generates a laser beam 6, a mirror 4 which deflects the direction of laser light 6, an optical attenuator 5 which attenuates the laser beam6, and a homogenizer 17 which spreads the laser beams 6 to a specified area and changes the direction from the oscillator to a glass substrate 2, are provided.
Abstract: PROBLEM TO BE SOLVED: To improve the positioning precision for laser irradiation, for preventing degradation in characteristics of a drive circuit part, by providing a laser anneal device which radiates the laser beam from a laser oscillator to a substrate with an optical detecting means which measure the intensity and/or wavelength of the reflection beam from the substrate. SOLUTION: A laser anneal device comprises an oscillator 3 which generates a laser beam 6. In the track of the laser beam 6 from the oscillator 3, a mirror 4 which deflects the direction of laser light 6, an optical attenuator 5 which attenuates the laser beam 6, and a homogenizer 17 which spreads the laser beam 6 to a specified area and changes the direction of the laser beam 6 to a glass substrate 2, are provided. The homogenizer 17 is provided with an illumination meter 7 which measures intensity of the reflection beam from a base material film and amorphous Si film 1. Related to the laser anneal device, the glass substrate 1 can be moved in vertically, horizontally, and rotationally.
31 citations
TL;DR: The experimental results show some effects that cannot be described by the linear acoustic theory, such as the jump phenomenon, harmonic generation, and the hysteresis effect, on the acoustic levitation of small particles.
Abstract: The nonlinear behavior of a 20.3 kHz single-axis acoustic levitator formed by a Langevin transducer with a concave radiating surface and a concave reflector is experimentally investigated. In this study, a laser Doppler vibrometer is applied to measure the nonlinear sound field in the air gap between the transducer and the reflector. Additionally, an electronic balance is used in the measurement of the acoustic radiation force on the reflector as a function of the distance between the transducer and the reflector. The experimental results show some effects that cannot be described by the linear acoustic theory, such as the jump phenomenon, harmonic generation, and the hysteresis effect. The influence of these nonlinear effects on the acoustic levitation of small particles is discussed.
31 citations
31 citations