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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\u2013120 \u03bcm), the different types of suitable semiconductor lasers (Fabry\u2013Perot, 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.<\/jats:p>","DOI":"10.3390\/s20205930","type":"journal-article","created":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T20:50:07Z","timestamp":1603227007000},"page":"5930","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Versatile Multimodality Imaging System Based on Detectorless and Scanless Optical Feedback Interferometry\u2014A Retrospective Overview for A Prospective Vision"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0985-8965","authenticated-orcid":false,"given":"Massimo","family":"Brambilla","sequence":"first","affiliation":[{"name":"Dipartimento di Fisica \u201cMichelangelo Merlin\u201d, Universit\u00e0 degli Studi e Politecnico di Bari, and IFN CNR, sede di Bari, via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6566-9763","authenticated-orcid":false,"given":"Lorenzo Luigi","family":"Columbo","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica \u201cMichelangelo Merlin\u201d, Universit\u00e0 degli Studi e Politecnico di Bari, and IFN CNR, sede di Bari, via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0571-1517","authenticated-orcid":false,"given":"Maurizio","family":"Dabbicco","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica \u201cMichelangelo Merlin\u201d, Universit\u00e0 degli Studi e Politecnico di Bari, and IFN CNR, sede di Bari, via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4220-5253","authenticated-orcid":false,"given":"Francesco","family":"De Lucia","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica \u201cMichelangelo Merlin\u201d, Universit\u00e0 degli Studi e Politecnico di Bari, and IFN CNR, sede di Bari, via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francesco Paolo","family":"Mezzapesa","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica \u201cMichelangelo Merlin\u201d, Universit\u00e0 degli Studi e Politecnico di Bari, and IFN CNR, sede di Bari, via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gaetano","family":"Scamarcio","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica \u201cMichelangelo Merlin\u201d, Universit\u00e0 degli Studi e Politecnico di Bari, and IFN CNR, sede di Bari, via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,10,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"480","DOI":"10.1109\/2944.401232","article-title":"External optical feedback phenomena in semiconductor lasers","volume":"1","author":"Petermann","year":"1995","journal-title":"IEEE J. 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