Results 31 to 40 of about 2,113 (128)

Laser Self-Mixing Sensor for Simultaneous Measurement of Young’s Modulus and Internal Friction

Photonics, 2021
The Young’s modulus and internal friction are two important parameters of materials. Self-mixing interferometry (SMI) is an emerging non-destructive sensing method that has been employed for various applications because of its advantages of simple ...
Bo Wang, Bin Liu, Lei An, Pinghua Tang, Haining Ji, Yuliang Mao   +5 more
doaj   +1 more source

Distance Measurement with Harmonic Modulation of Self-Mixing Laser Wavelength at External Optical Feedback [PDF]

Известия Саратовского университета. Новая серия: Физика, 2020
Background and Objectives: Self-mixing interferometry of absolute distances is currently well represented by the method of frequency modulation of the laser diode supply current (FMCW). In recent years a harmonic modulation of the power current of a self-
Skripal, Anatoly Vladimirovich, Dobdin, Sergey Iur'evich, Dzhafarov, Aleksey Vladimirovich, Sadchikova, Karina Armenakovna, Feklistov, Vladimir Borisovich   +4 more
doaj   +1 more source

Measurements of the linewidth enhancement factor of mid-infrared quantum cascade lasers by different optical feedback techniques

AIP Advances, 2016
Precise knowledge of the linewidth enhancement factor of a semiconductor laser under actual operating conditions is of prime importance since this parameter dictates various phenomena such as linewidth broadening or optical nonlinearities enhancement ...
L. Jumpertz, F. Michel, R. Pawlus, W. Elsässer, K. Schires, M. Carras, F. Grillot   +6 more
doaj   +1 more source

In situ measurement of particle flow during fiber laser additive manufacturing with powder feeding

Results in Physics, 2022
In situ measurement of particle flow is a promising tool to visualize how the particles affect the power feeding laser additive manufacturing (PFLAM).
Jianglin Zou, Zi Wang, Yu Zhao, Xue Han, Jinjie Gong   +4 more
doaj   +1 more source

Ultrastable Offset-Locking Continuous Wave Laser to a Frequency Comb with a Compound Control Method for Precision Interferometry

Sensors, 2020
A simple and robust analog feedforward and digital feedback compound control system is presented to lock the frequency of a slave continuous wave (CW) laser to an optical frequency comb.
Ruitao Yang, Haisu Lv, Jing Luo, Pengcheng Hu, Hongxing Yang, Haijin Fu, Jiubin Tan   +6 more
doaj   +1 more source

Coherent Beam Combining Using an Internally Sensed Optical Phased Array of Frequency-Offset Phase Locked Lasers

Photonics, 2020
Coherent beam combining can be used to scale optical power and enable mechanism-free beam steering using an optical phased array. Coherently combining multiple free-running lasers in a leader-follower laser configuration is challenging due to the need to
Lyle E. Roberts, Robert L. Ward, Craig Smith, Daniel A. Shaddock   +3 more
doaj   +1 more source

A Compact Laser Imaging System for Concurrent Reflectance Confocal Microscopy and Laser Doppler Flowmetry

IEEE Photonics Journal, 2016
We propose a compact laser feedback interferometry imaging system for concurrent reflectance confocal microscopy and laser Doppler flowmetry. This system acquires both confocal reflectance and Doppler signals in a confocal architecture to image dynamic ...
Alireza Mowla, Thomas Taimre, Yah Leng Lim, Karl Bertling, Stephen J. Wilson, Tarl W. Prow, Aleksandar D. Rakic   +6 more
doaj   +1 more source

Coherent control of scattering and absorption in organic microresonators [PDF]

EPJ Web of Conferences
We study coherent perfect absorption in organic microcavity resonators and extend these principles and our findings to more complex microresonator systems that, beyond absorption, also possess additional cavity energy dissipation mechanisms.
Pietsch Frithjof, Lindenthal Jakob, Antrack Tobias, Benduhn Johannes, Sudzius Markas, Leo Karl   +5 more
doaj   +1 more source

Linking Device Performance to Nanoscale Photoactivation of Grain Boundaries in 2D Hybrid Halide Perovskites

Advanced Materials Technologies, EarlyView.
The opto‐electronic response of polycrystalline (PEA)2PbBr4 thin films is investigated by correlating macroscopic photodetector performance with nanoscale mapping techniques. Grain boundary density is systematically tuned through crystallization control and linked to device responsivity.
Camilla Bordoni, Lorenzo Calcaterra, Andrea Ciavatti, Silvia Milita, Valentina Bonino, Lorenzo Margotti, Sara Cepić, Marisa Di Sabatino, Federico Boscherini, Daniela Cavalcoli, Beatrice Fraboni   +10 more
wiley   +1 more source

Self-Mixing Interferometer for Acoustic Measurements through Vibrometric Calibration

Sensors
The Self-Mixing Interformeter (SMI) is a self-aligned optical interferometer which has been used for acoustic wave sensing in air through the acousto-optic effect.
Simon Chanu-Rigaldies, Pierre Lecomte, Sébastien Ollivier, Thomas Castelain   +3 more
doaj   +1 more source