{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T04:13:17Z","timestamp":1775621597278,"version":"3.50.1"},"reference-count":42,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T00:00:00Z","timestamp":1740096000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Romanian Ministry of Education and Research","award":["30N\/2023"],"award-info":[{"award-number":["30N\/2023"]}]},{"name":"Romanian Ministry of Education and Research","award":["PCE 49\/2021"],"award-info":[{"award-number":["PCE 49\/2021"]}]},{"name":"Romanian Ministry of Education and Research","award":["PN-III-P4-ID-PCE-2020\u20132203"],"award-info":[{"award-number":["PN-III-P4-ID-PCE-2020\u20132203"]}]},{"name":"PNCDI III","award":["30N\/2023"],"award-info":[{"award-number":["30N\/2023"]}]},{"name":"PNCDI III","award":["PCE 49\/2021"],"award-info":[{"award-number":["PCE 49\/2021"]}]},{"name":"PNCDI III","award":["PN-III-P4-ID-PCE-2020\u20132203"],"award-info":[{"award-number":["PN-III-P4-ID-PCE-2020\u20132203"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Herein we present a roadmap for tailoring the crystal growth conditions, near-infrared (NIR) laser emission, and self-frequency doubling (SFD) performances of newly developed Nd-doped LaxGdySc4\u2212x\u2212y(BO3)4 (Nd:LGSB) crystals. Three different Nd3+ doping concentrations of 2.3 at.%, 3.5 at.%, and 4.6 at.% were investigated. Considering their incongruent melting, special conditions were employed for the growth using the Czochralski technique. Laser emission performances at 1062 nm in the CW regime were evaluated for uncoated crystal samples with different orientations (a-cut, c-cut, and SFD-cut). The highest slope efficiency \u03b7sa = 0.68 was obtained for the 4.6 at.% c-cut Nd:LGSB crystal, with a randomly polarized emission. The a-cut 4.6 at.% Nd:LGSB crystal delivered a linearly polarized beam with a slope efficiency \u03b7sa = 0.63. The SFD-cut 2.3 at.% and 3.5 at.% Nd:LGSB crystals achieved slightly lower efficiencies of ~ 0.56. The SFD capabilities of 2.3 at.% and 3.5 at.% Nd:LGSB crystals were also explored. Green laser emission at ~531 nm was achieved with a diode-to-green conversion efficiency increasing significantly from 0.17% to 1.44%, respectively. These results demonstrate that the Nd-doping concentration, crystal orientation, and sample length of Nd:LGSB crystals, must be carefully selected depending on the specific requirements of the intended application.<\/jats:p>","DOI":"10.3390\/ma18050964","type":"journal-article","created":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T09:26:32Z","timestamp":1740129992000},"page":"964","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Bifunctional Nd-Doped LGSB Crystals: A Roadmap for Crystal Growth and Improved Laser Emission Performance in the NIR and Green Domains"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4611-8376","authenticated-orcid":false,"given":"Alin","family":"Broasca","sequence":"first","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0613-9735","authenticated-orcid":false,"given":"Madalin","family":"Greculeasa","sequence":"additional","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Flavius","family":"Voicu","sequence":"additional","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6745-9647","authenticated-orcid":false,"given":"Cristina","family":"Gheorghe","sequence":"additional","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1718-5972","authenticated-orcid":false,"given":"Stefania","family":"Hau","sequence":"additional","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Catalina","family":"Susala","sequence":"additional","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7904-5540","authenticated-orcid":false,"given":"Lucian","family":"Gheorghe","sequence":"additional","affiliation":[{"name":"National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"110202","DOI":"10.1016\/j.optlastec.2023.110202","article-title":"Application and development of blue and green laser in industrial manufacturing: A review","volume":"170","author":"Yang","year":"2024","journal-title":"Opt. Laser Technol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"111206","DOI":"10.1016\/j.ymssp.2024.111206","article-title":"System modeling and sliding mode control of fast steering mirror for space laser communication","volume":"211","author":"Li","year":"2024","journal-title":"Mech. Syst. Signal Process."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"110459","DOI":"10.1016\/j.optlastec.2023.110459","article-title":"An overview of selective laser sintering 3D printing technology for biomedical and sports device applications: Processes, materials, and applications","volume":"171","author":"Song","year":"2024","journal-title":"Opt. Laser Technol."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Juda, M., Bedli\u0144ski, M., Roszkowska, A.M., and Wierzbowska, J. (2024). Clinical Evaluation of Corneal Endothelial Parameters following Laser Refractive Surgery in Myopic Eyes: A Review. J. Clin. Med., 13.","DOI":"10.3390\/jcm13061665"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"2200130","DOI":"10.1002\/aisy.202200130","article-title":"When the end effector is a laser: A review of robotics in laser surgery","volume":"4","author":"Lee","year":"2022","journal-title":"Adv. Intell. Syst."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Cios, A., Ciepielak, M., Szyma\u0144ski, \u0141., Lewicka, A., Cierniak, S., Stankiewicz, W., Mendrycka, M., and Lewicki, S. (2021). Effect of different wavelengths of laser irradiation on the skin cells. Int. J. Mol. Sci., 22.","DOI":"10.3390\/ijms22052437"},{"key":"ref_7","first-page":"2488","article-title":"Nondamaging retinal laser therapy: Rationale and applications to the macula","volume":"57","author":"Lavinsky","year":"2016","journal-title":"IOVS"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Sawruk, N., and Schober, A. (2019). Engineering Laser Systems for Aerospace and Defense Applications. Appl. Ind. Opt. Spectrosc. Imaging Metrol., M3A-2.","DOI":"10.1364\/AIO.2019.M3A.2"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"583","DOI":"10.1016\/j.dt.2020.02.012","article-title":"Survey and technological analysis of laser and its defense applications","volume":"17","author":"Ahmed","year":"2021","journal-title":"Def. Technol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"612","DOI":"10.1016\/j.jmatprotec.2017.09.023","article-title":"Laser additive manufacturing of contact materials","volume":"252","author":"Szemkus","year":"2018","journal-title":"J. Mater. Process. Technol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"110212","DOI":"10.1016\/j.optlastec.2023.110212","article-title":"Progress in applications of laser induced cavitation on surface processing","volume":"170","author":"Zhang","year":"2024","journal-title":"Opt. Laser Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1016\/j.jmapro.2024.02.062","article-title":"Laser-processed functional surface structures for multi-functional applications\u2014A review","volume":"116","author":"Wang","year":"2024","journal-title":"J. Manuf. Process."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"123988","DOI":"10.1016\/j.applthermaleng.2024.123988","article-title":"Laser ignition versus conventional spark ignition system performance for hydrogen-enriched natural gas-air mixtures in a constant volume combustion chamber","volume":"257","author":"Kumar","year":"2024","journal-title":"Appl. Therm. Eng."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"103358","DOI":"10.1016\/j.rineng.2024.103358","article-title":"Multiple-beam output, high-peak power passively Q-switched Nd: YAG\/Cr4+: YAG laser for ignition application-Modeling of laser pulse characteristics and thermal behavior","volume":"24","author":"Grigore","year":"2024","journal-title":"Results Eng."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"30344","DOI":"10.1364\/OE.532567","article-title":"Laser ignition of hydrogen\/air mixtures in a constant-volume combustion chamber using a pulse-burst Nd:YAG\/Cr4+:YAG laser spark plug","volume":"32","author":"Grigore","year":"2024","journal-title":"Opt. Express"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"861","DOI":"10.1109\/3.572162","article-title":"Ultrahigh-average-power diode-pumped Nd:YAG and Yb:YAG lasers","volume":"33","author":"Brown","year":"1997","journal-title":"IEEE J. Quant. Electron."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1287","DOI":"10.1109\/2944.902180","article-title":"Ytterbium solid-state lasers. The first decade","volume":"6","author":"Krupke","year":"2000","journal-title":"IEEE J. Sel. Top. Quantum Electron."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"183","DOI":"10.1016\/j.optlastec.2004.11.012","article-title":"Compact high-power end-pumped Nd: YAG laser","volume":"38","author":"Frede","year":"2006","journal-title":"Opt. Laser Technol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"844","DOI":"10.1063\/1.1544659","article-title":"Laser operation with near quantum-defect slope efficiency in Nd: YVO4 under direct pumping into the emitting level","volume":"82","author":"Sato","year":"2003","journal-title":"Appl. Phys. Lett."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2295","DOI":"10.1109\/3.644113","article-title":"Investigation of efficient self-frequency-doubling Nd: YAB lasers","volume":"33","author":"Bartschke","year":"1997","journal-title":"IEEE J. Quantum Electron."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"3473","DOI":"10.1021\/acs.cgd.6b00446","article-title":"Czochralski growth and characterization of incongruent melting LaxGdyScz(BO3)4 (x + y + z = 4) nonlinear optical crystal","volume":"16","author":"Gheorghe","year":"2016","journal-title":"Cryst. Growth Des."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1046","DOI":"10.1107\/S0567740870003576","article-title":"Revised values of effective ionic radii","volume":"26","author":"Shannon","year":"1970","journal-title":"Acta Crystallogr. Sect. B Struct. Crystallogr. Cryst. Chem."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"106433","DOI":"10.1016\/j.optlastec.2020.106433","article-title":"Bifunctional LaxNdyGdzSc4\u2212x\u2212y\u2212z(BO3)4 crystal: Czochralski growth, linear and nonlinear optical properties, and near-infrared laser emission performances","volume":"131","author":"Greculeasa","year":"2020","journal-title":"Opt. Laser Technol."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"111832","DOI":"10.1016\/j.optmat.2021.111832","article-title":"Growth and characterization of 3.5 at.% Nd:LGSB bifunctional crystal","volume":"123","author":"Broasca","year":"2022","journal-title":"Opt. Mater."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1016\/S0925-3467(99)00024-5","article-title":"Nd3+ ion based self frequency doubling solid state lasers","volume":"13","author":"Jaque","year":"1999","journal-title":"Opt. Mater."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"20987","DOI":"10.1021\/acsami.9b04430","article-title":"Incongruent Melting LaxYySc4\u2212x\u2212y(BO3)4: LYSB Nonlinear Optical Crystal Grown by the Czochralski Method","volume":"11","author":"Gheorghe","year":"2019","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"2687","DOI":"10.1021\/cm050090c","article-title":"Nonlinear optical crystal YxLayScz(BO3)4 (x + y + z = 4)","volume":"17","author":"Ye","year":"2005","journal-title":"Chem. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Maillard, A.A., Maillard, R.S., Loiseau, P., Aka, G., Villeval, P., and Rytz, D. (2014, January 16\u201321). Defect Similitude in LYSB and YAB Crystals and ONL Characterization. Proceedings of the 2014 Advanced Solid State Lasers, OSA Technical Digest, Shanghai, China.","DOI":"10.1364\/ASSL.2014.ATh2A.12"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1080\/01442358909353223","article-title":"The Anionic Group-Theory of the Non-Linear Optical Effect and its Applications in the Development of New High-Quality NLO Crystals in the Borate Series","volume":"8","author":"Chen","year":"1989","journal-title":"Int. Rev. Phys. Chem."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1016\/j.jcrysgro.2011.12.063","article-title":"Crystal growth and optical properties of YAl3(BO3)4 for UV applications","volume":"341","author":"Yu","year":"2012","journal-title":"J. Cryst. Growth"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Rytz, D., Gross, A., Vernay, S., and Wesemann, V. (2008, January 16). YAl3(BO3)4: A novel NLO crystal for frequency conversion to UV wavelengths. Proceedings of the Solid State Lasers and Amplifiers III, Strasbourg, France.","DOI":"10.1117\/12.780027"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"450","DOI":"10.1109\/JQE.1974.1068162","article-title":"Induced-emission cross sections in neodymium laser glasses","volume":"10","author":"Krupke","year":"1974","journal-title":"IEEE J. Quantum Electron."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"2196","DOI":"10.1021\/jacs.3c12371","article-title":"LGYSB:Nd\u2014High-Performance Lasing in the Near-Infrared Region","volume":"146","author":"Broasca","year":"2024","journal-title":"J. Am. Chem. Soc."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"913","DOI":"10.1109\/3.291362","article-title":"Spectroscopic properties, and efficient diode-pumped laser operation of neodymium-doped lanthanum scandium borate","volume":"30","author":"Meyn","year":"1994","journal-title":"IEEE J. Quantum Electron."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Brandus, C.A., Hau, S., Broasca, A., Greculeasa, M., Voicu, F.M., Gheorghe, C., Gheorghe, L., and Dascalu, T. (2019). Efficient 1 \u00b5m laser emission of Czochralski-grown Nd: LGSB single crystal. Materials, 12.","DOI":"10.3390\/ma12122005"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Svelto, O., and Hanna, D.C. (2010). Principles of Lasers, Springer.","DOI":"10.1007\/978-1-4419-1302-9"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"685","DOI":"10.1364\/OME.416425","article-title":"Diode-pumped bifunctional Nd:LGSB laser passively Q-switched by a Cr4+:YAG saturable absorber","volume":"11","author":"Brandus","year":"2021","journal-title":"Opt. Mater. Express"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1016\/S0030-3992(00)00116-X","article-title":"Investigation of LD end-pumped Nd: YVO4 crystals with various doping levels and lengths","volume":"33","author":"Wang","year":"2001","journal-title":"Opt. Laser Technol."},{"key":"ref_39","first-page":"4377","article-title":"Characterization and laser performance of a new material: 2 at.% Nd:YAG grown by the Czochralski method","volume":"41","author":"Bitz","year":"2022","journal-title":"Appl. Opt."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"L70","DOI":"10.1143\/JJAP.43.L70","article-title":"Laser Emission under 4F5\/2 and 4F3\/2 Pumping in Nd: LSB Micro-Laser","volume":"43","author":"Jang","year":"2004","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1002\/1521-396X(200201)189:1<253::AID-PSSA253>3.0.CO;2-U","article-title":"Spectroscopic properties and diode laser-pumped operation of Nd:YAl3(BO3)4 crystal","volume":"189","author":"Jiang","year":"2002","journal-title":"Phys. Status Solidi"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1364\/JOSAB.30.000033","article-title":"Effect of pump wavelength on Nd3+: YAB self-frequency-doubling laser","volume":"30","author":"Huang","year":"2013","journal-title":"J. Opt. Soc. Am. 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