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Express"],"published-print":{"date-parts":[[2022,10,10]]},"abstract":"<jats:p>Femtosecond laser filamentation propagating tens of meters to several kilometers with high intensity in the atmosphere has been demonstrated as a powerful tool for remote sensing. In contrast to the refractive systems, the reflective optical systems possess a variety of advantages including broad bandwidth, large aperture, light weight and low energy loss. However, astigmatic aberration is inevitably introduced by off-axis reflective mirrors. It can greatly affect the filament quality, which is critical for exciting and detecting the fluorescence of target molecules. Here we elaborately design a free-form phase plate to correct the astigmatism in off-axis reflective optical systems. It is demonstrated that the free-form surface exhibits excellent performance, significantly reducing the astigmatic difference from 44 cm to 4 cm and increasing the maximum acoustic intensity by a factor of 53. In addition, extremely strong nitrogen fluorescence spectra have been detected. These results indicate that the free-form phase plate can effectively compensate for astigmatic aberration in off-axis reflective system, providing a guiding significance for the optimal control of filamentation and remote sensing.<\/jats:p>","DOI":"10.1364\/oe.473776","type":"journal-article","created":{"date-parts":[[2022,9,28]],"date-time":"2022-09-28T01:00:08Z","timestamp":1664326808000},"page":"38745","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Giant enhancement of acoustic and fluorescence emission from an off-axis reflective femtosecond laser filamentation system"],"prefix":"10.1364","volume":"30","author":[{"given":"Shishi","family":"Tao","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bofu","family":"Xie","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayun","family":"Xue","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1617-194X","authenticated-orcid":true,"given":"Zhi","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4850-2435","authenticated-orcid":true,"given":"Nan","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lanjun","family":"Guo","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lie","family":"Lin","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2885-2072","authenticated-orcid":true,"given":"Pengfei","family":"Qi","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Zhao","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6036-9641","authenticated-orcid":true,"given":"Weiwei","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y1kjr75","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2022,10,4]]},"reference":[{"key":"oe-30-21-38745-R1","doi-asserted-by":"publisher","first-page":"47","DOI":"10.1016\/j.physrep.2006.12.005","volume":"441","author":"Couairon","year":"2007","journal-title":"Phys. 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