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Measurement of remote sound based on laser feedback interferometry
Frontiers in Optics / Laser Science, 2018An optical sound measurement technology is developed based on microchip Nd:YVO4 laser feedback interferometry. The system can recover the sound signal by measuring the vibration of non-cooperative target, which is located in the sound field.
Zongren Dai, Kaiyi Zhu, Yidong Tan
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Terahertz Time Domain and Laser Feedback Interferometry Study of Sulfur Inclusion in Marble
2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)The accelerated deterioration of marble monuments and structures in recent times, due to acid (mainly sulfuric acid) deposition presents substantial challenges for heritage conservationists. This work investigates the effectiveness of utilizing Terahertz Time-Domain Spectroscopy and Imaging (TDSI) in addition to Laser Feedback Interferometry (LFI) in ...
Chanda, Puspita +14 more
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Optics and Lasers in Engineering, 2021
A remote eavesdropping system based on the laser feedback interferometry is proposed. The diffuse objects neighboring the speaker can work as inconspicuous sensors. The modulated incident beam is scattered back to the laser cavity by the objects, forming
Shulian Zhang +2 more
exaly +2 more sources
A remote eavesdropping system based on the laser feedback interferometry is proposed. The diffuse objects neighboring the speaker can work as inconspicuous sensors. The modulated incident beam is scattered back to the laser cavity by the objects, forming
Shulian Zhang +2 more
exaly +2 more sources
Static Laser Feedback Interferometry-Based Gaze Estimation for Wearable Glasses
IEEE Sensors Journal, 2023Fast and robust gaze estimation is a key technology for wearable glasses, as it enables novel methods of user interaction as well as display enhancement applications, such as foveated rendering.
Johannes Meyer +2 more
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International Conference on Infrared, Millimeter, and Terahertz Waves, 2023
We report the use of a generalized phase-extraction algorithm to extract amplitude and phase data in THz scattering-type scanning near-field optical microscopy (s-SNOM) employing laser feedback interferometry in a THz quantum cascade laser.
D. Mohun +7 more
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We report the use of a generalized phase-extraction algorithm to extract amplitude and phase data in THz scattering-type scanning near-field optical microscopy (s-SNOM) employing laser feedback interferometry in a THz quantum cascade laser.
D. Mohun +7 more
semanticscholar +1 more source
Proc. ACM Hum. Comput. Interact., 2022
Robust and highly integrated eye-tracking is a key technology to improve resolution of near-eye-display technologies for augmented reality (AR) glasses such as focus-free retinal projection as it enables display enhancements like foveated rendering ...
Johannes Meyer +2 more
semanticscholar +1 more source
Robust and highly integrated eye-tracking is a key technology to improve resolution of near-eye-display technologies for augmented reality (AR) glasses such as focus-free retinal projection as it enables display enhancements like foveated rendering ...
Johannes Meyer +2 more
semanticscholar +1 more source
Parallel multiplex laser feedback interferometry
Review of Scientific Instruments, 2013We present a parallel multiplex laser feedback interferometer based on spatial multiplexing which avoids the signal crosstalk in the former feedback interferometer. The interferometer outputs two close parallel laser beams, whose frequencies are shifted by two acousto-optic modulators by 2Ω simultaneously. A static reference mirror is inserted into one
Song, Zhang, Yidong, Tan, Shulian, Zhang
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Applications of diode laser feedback interferometry
Journal of Optics, 1998We review the major features of laser diode feedback interferometry for sensing applications. The ensembles of the feedback effects on the optical field can be exploited for several non-contact measurements such as displacement, distance, vibration amplitude and frequency. Methods of signal processing are also discussed. On resume les characteristiques
DONATI, SILVANO, MERLO, SABINA GIOVANNA
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Optics Letters, 2021
This Letter proposes an all-fiber self-mixing interferometric method based on laser feedback technology with long transmission distance, which has advantages of high sensitivity and compact structure. We theoretically and experimentally verify that the measurement distance of the self-mixing sensor is not limited to the coherence length of the solitary
Yourui Tu +9 more
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This Letter proposes an all-fiber self-mixing interferometric method based on laser feedback technology with long transmission distance, which has advantages of high sensitivity and compact structure. We theoretically and experimentally verify that the measurement distance of the self-mixing sensor is not limited to the coherence length of the solitary
Yourui Tu +9 more
openaire +2 more sources