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A simple laser diode, without lenses, is demonstrated as a flow sensor. The diode is placed directly on the edge of the duct, exploiting the natural laser divergence. The flow-measurement is based on the Doppler shift induced by the scattering particles inside the fluid, read by the self-mixing effect inside the laser diode. The proposed approach was modeled by a numerical simulation, in order to...
Round-robin measurements on the linewidth enhancement factor are carried out in many laboratories participating to EU COST 288 Action. Up to 7 different techniques are applied to DFB, VCSELs, QCL, and QD lasers, and results are compared.
The adverse effects of back-reflected waves on a diode laser used as a transmitter can be substantially mitigated if the current biasing is set at a specific value, the self-mixing crossover which can be found by a simple setup. A de-sensitization of the reflection effects by a factor of 25 dB has been observed.
Round-robin measurements on the linewidth enhancement factor are carried out within several laboratories participating to EU COST 288 action. The alpha-factor is measured by applying up to 7 different techniques. The obtained results are compared.
An instrument for non-contact measurement of differential displacements is realized based on two self-mixing laser diode interferometers. Stress-strain hysteresis cycles in micro- and gross-slip regimes of two metal samples kept into contact are measured.
This paper reports on the fabrication and experimental characterization of index-guided semiconductor ring laser (SRLs) designed to operate on single transversal and longitudinal mode. Contrary to expectation, SRLs do not exhibit plain bidirectional CW operation for the two counterpropagating modes. Rather, they show an intricate and interesting regimes sequence, including, bidirectional operation...
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