Results 31 to 40 of about 3,712 (221)

Self-mixing interferometry for distance measurement using a semiconductor laser with current-modulated wavelength [PDF]

Компьютерная оптика, 2018
The capabilities of the method of current-modulated laser wavelength are shown to be extended by using harmonic modulation. Advantages of the sawtooth modulation method associated with using the frequency measurements of the interference signal as an ...
Dmitry Usanov, Anatoly Skripal, Elisey Astakhov, Irina Kostuchenko, Sergey Dobdin   +4 more
doaj   +1 more source

Dealing With Speckle Effects in Self-Mixing Interferometry Measurements

IEEE Sensors Journal, 2013
An analysis of speckle effects and the techniques to overcome them in self-mixing interferometry signals is presented. We characterize the effect of surface roughness and laser spot size on the speckle modulation of the signal, and then propose two simple experimental approaches to overcome the amplitude fading induced by the speckle effect. Unlike the
Atashkhooei, Reza, Royo Royo, Santiago, Azcona Guerrero, Francisco Javier   +2 more
openaire   +3 more sources

Application of self-mixing interferometry for depth monitoring in the ablation of TiN coatings [PDF]

, 2014
Among possible monitoring techniques, self-mixing interferometry stands out as an appealing option for online ablation depth measurements. The method uses a simple laser diode, interference is detected inside the diode cavity and measured as the optical ...
Michele Norgia, DEMIR, ALI GOKHAN, Ali Gökhan Demir, Alessandro Magnani, PREVITALI, BARBARA, NORGIA, MICHELE, Barbara Previtali, MAGNANI, ALESSANDRO, Alessandro Pesatori, PESATORI, ALESSANDRO   +9 more
core   +1 more source

Self-Mixing Interferometry With Terahertz Quantum Cascade Lasers

IEEE Sensors Journal, 2013
Terahertz frequency quantum cascade lasers (THz QCLs) are compact sources of coherent THz radiation with potential applications that include astronomy, trace-gas sensing, and security imaging. However, the reliance on slow and incoherent thermal detectors has limited their practical use in THz systems.
Valavanis, Alex, Dean, Paul, Lim, Yah Leng, Alhathlool, Raed, Nikolić, Milan, Kliese, Russell, Khanna, Suraj P., Indjin, Dragan, Wilson, Stephen J., Rakić, Aleksandar D., Linfield, Edmund H., Davies, Giles   +11 more
openaire   +5 more sources

Nanodisplacement measurements by frequency-modulated laser autodyne [PDF]

Известия Саратовского университета. Новая серия: Физика, 2021
Background and Objectives: Measurements of nanodisplacements are relevant for various applications of self-mixing laser (autodyne), in particular when they are combined with microwave probe methods, which are sensitive not only to the profile, but also ...
Dobdin, Sergey Iur'evich, Dzhafarov, Aleksey Vladimirovich, Shchedrinov, Maksim Petrovich, Inkin, Maksim Glebovich, Skripal, Anatoly Vladimirovich   +4 more
doaj   +1 more source

A New Algorithm for Displacement Measurement Using Self-Mixing Interferometry With Modulated Injection Current

IEEE Access, 2020
Using self-mixing interferometry (SMI) with a periodical modulated injection current, high resolution displacement sensing can be achieved by retrieving the initial phase of an SMI signal at each modulation period.
Han Wang, Yuxi Ruan, Yanguang Yu, Qinghua Guo, Jiangtao Xi, Jun Tong   +5 more
doaj   +1 more source

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

Self-mixing interferometry and near-field nanoscopy in quantum cascade random lasers at terahertz frequencies

Nanophotonics, 2021
We demonstrate that electrically pumped random laser resonators, operating at terahertz (THz) frequencies, and comprising a quantum cascade laser heterostructure, can operate as sensitive photodetectors through the self-mixing effect.
Reichel Kimberly S., Pogna Eva Arianna Aurelia, Biasco Simone, Viti Leonardo, Di Gaspare Alessandra, Beere Harvey E., Ritchie David A., Vitiello Miriam S.   +7 more
doaj   +1 more source

Dynamic stability analysis for a self-mixing interferometry system

Optics Express, 2014
A self-mixing interferometry (SMI) system is a laser diode (LD) with an external cavity formed by a moving external target. The behavior of an SMI system is governed by the injection current J to the LD and the parameters associated with the external cavity mainly including optical feedback factor C, the initial external cavity length (L₀) and the ...
Fan, Yuanlong, Yu, Yanguang, Xi, Jiangtao, Guo, Qinghua   +3 more
openaire   +3 more sources

Differential self-mixing interferometry for micro-cantilever motion sensing

, 2015
Force sensing is a common practice used for the characterization of matter properties and in particular of bio-materials. Different optical methods have been used in the past to allow high resolution force measurements while avoiding uncertainties ...
Yáñez, Carlos, Royo Royo, Santiago, Francisco J. Azcona, Carlos Yañez, Azcona Guerrero, Francisco Javier, Ajit Jha, Jha, Ajit, Santiago Royo   +7 more
core   +1 more source