{"doi":"10.1364/ol.550709","title":"A two-photon lensless endoscope with a double-clad tapered multi-core fiber","abstract":"We present a novel, to the best of our knowledge, multi-core fiber-based lensless micro-endoscope incorporating several key innovations: a Fermat's golden spiral core layout, a low-index polymer cladding, and a longitudinally varying fiber diameter. This fiber design enables efficient focusing of ultrashort pulses and collection of the fluorescence signal with both diffraction-limited resolution and field of view. These advancements address several long-standing challenges in the development of ultra miniaturized non-linear endoscopes. We characterize the device's performance by evaluating the Strehl ratio, field of view, and memory effect. Finally, we demonstrate its application to biological cellular samples by performing two-photon excited fluorescence imaging in an endoscopic configuration.","journal":"Optics Letters","year":2025,"id":540336,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":2,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9584,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2025-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1428135,"name":"Matthias Höfer","orcid":"0000-0001-9256-7765","position":1,"is_corresponding":false},{"id":1428461,"name":"Adrien Carron","orcid":null,"position":2,"is_corresponding":false},{"id":1428462,"name":"Fatima El Moussawi","orcid":null,"position":3,"is_corresponding":false},{"id":1428136,"name":"Aymeric Pastre","orcid":"0000-0001-7233-231X","position":4,"is_corresponding":false},{"id":1428463,"name":"Remy Bernand","orcid":null,"position":5,"is_corresponding":false},{"id":888631,"name":"Damien Labat","orcid":null,"position":6,"is_corresponding":false},{"id":887956,"name":"Andy Cassez","orcid":"0000-0003-1043-9300","position":7,"is_corresponding":false},{"id":565073,"name":"Rosa Cossart","orcid":"0000-0003-2111-6638","position":8,"is_corresponding":false},{"id":1428137,"name":"Olivier Vanvincq","orcid":"0000-0001-6325-6909","position":9,"is_corresponding":false},{"id":707372,"name":"Géraud Bouwmans","orcid":"0000-0001-9107-7115","position":10,"is_corresponding":false},{"id":488034,"name":"Siddharth Sivankutty","orcid":"0000-0001-5079-4409","position":11,"is_corresponding":false},{"id":488037,"name":"Hervé Rigneault","orcid":"0000-0001-6007-0631","position":12,"is_corresponding":false},{"id":707373,"name":"Esben Ravn Andresen","orcid":"0000-0002-7522-6165","position":13,"is_corresponding":false},{"id":1428134,"name":"Luca Genchi","orcid":"0000-0002-0808-112X","position":0,"is_corresponding":true}],"reference_count":22,"raw_metadata":null,"created_at":"2026-07-19T02:52:38.861025Z","pmid":"40232455","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}