Versatile Multimodality Imaging System Based on Detectorless and Scanless Optical Feedback Interferometry-A Retrospective Overview for A Prospective Vision

In this retrospective compendium, we attempt to draw a "fil rouge" along fifteen years of our research in the field of optical feedback interferometry aimed at guiding the readers to the verge of new developments in the field. The general reader will be moved at appreciating the versatility and the still largely uncovered potential of the optical feedback interferometry, for both sensing and imaging applications. By discovering the broad range of available wavelengths (0.4-120 μm), the different types of suitable semiconductor lasers (Fabry-Perot, distributed feedback, vertical-cavity, quantum-cascade), and a number of unconventional tenders in multi-axis displacement, ablation front progression, self-referenced measurements, multispectral, structured light feedback imaging and compressive sensing, the specialist also could find inspirational suggestions to expand his field of research

The essentials of science communication in a course engaging both for students and professionals

[EN] On the one hand, science is increasingly entering the governance of modern society. On the other hand, society seems to be lagging behind scientific achievements, increasingly often unable to understand its language. The language gap is based on the well-known intimidating appeal of STEM programs and the unreasonable timidity of scientific degree courses to include communication skills as mandatory. An open course was experimented to provide students with the necessary tools to decode and encode the essential elements of science communication, regardless of disciplinary content.  The course, which was designed following the 5W+H "golden rule" of non-academic science communication, has been offered for three consecutive years to nearly one hundred students. The students' perspective is analysed in terms of their perception that they have achieved their own learning expectations. The main result is that it is possible to involve undergraduates, graduates and professionals in rethinking their approach to communicating scientific content to the general public, with rewarding results for all players, when focusing on the greatest common divisor instead of the least common multiple among the disciplinary languages and communication templates.Communication of Science is funded by UniBa, call Competenze Trasversali. This work is supported by PANDORA (Horizon Europe Seed - UniBa) to foster scientific citizenship.Dabbicco, M.; Liuzzi, F.; Lucente, S.; Trotta, M. (2023). The essentials of science communication in a course engaging both for students and professionals. Editorial Universitat Politècnica de València. 825-833. https://doi.org/10.4995/HEAd23.2023.1627282583

Detectorless measurements of the operational linewidth of NIR VCSELs by self-mixing interferometry

Self-mixing based on vertical-cavity surface-emitting lasers (VCSELs) offers a compact and low-cost coherent detection scheme for interferometric accessible measurements. The direct detection of the change in the junction voltage, in contrast to the traditional optical detection method by means of an external photodiode, further simplifies the setup by adding detector-less capability. The linewidth of an NIR VCSEL was estimated by using the method based on the statistical analysis of the laser self-mixing fringe period in the moderate feedback regime. We investigate the junction voltage noise and optical power noise, simultaneously acquired, in order to establish the best operational condition for both detection schemes. When comparing the laser linewidth measured by the traditional optical power modulation with that of the detector-less voltage self-mixing signal, the agreement is within the experimental errors