共 50 条
- [1] Passively mode-locked Yb:CaF2 thin-disk laserOPTICS EXPRESS, 2014, 22 (19): : 22278 - 22284Dannecker, Benjamin论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyDelen, Xavier论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyWentsch, Katrin S.论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyWeichelt, Birgit论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyHoenninger, Clemens论文数: 0 引用数: 0 h-index: 0机构: Amplitude Syst, F-33600 Pessac, France Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyVoss, Andreas论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyAhmed, Marwan Abdou论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyGraf, Thomas论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany
- [2] Double-wall carbon nanotube absorber for passively mode-locked Yb3+:Sc2SiO5 laserLASER PHYSICS LETTERS, 2012, 9 (02) : 120 - 125Su, L. M.论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaWang, Y. G.论文数: 0 引用数: 0 h-index: 0机构: Acad Sinica, Res Ctr Appl Sci, Taipei 30010, Taiwan Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaLiu, J.论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaZheng, L. H.论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Inst 2, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaSu, L. B.论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Inst 2, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaXu, J.论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Inst 2, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China
- [3] First demonstration of passively mode-locked Yb:CaF2 thin-disk laserSOLID STATE LASERS XXIV: TECHNOLOGY AND DEVICES, 2015, 9342Dannecker, Benjamin论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyDelen, Xavier论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyWentsch, Katrin S.论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyWeichelt, Birgit论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyHoenninger, Clemens论文数: 0 引用数: 0 h-index: 0机构: Amplitude Syst, F-33600 Pessac, France Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyVoss, Andreas论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyAhmed, Marwan Abdou论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, GermanyGraf, Thomas论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany Univ Stuttgart, Inst Strahlwerkzeuge IFSW, D-70569 Stuttgart, Germany
- [4] Passively mode-locked Yb3+:Sc2SiO5 laser with reflection-type single-walled carbon nanotube absorberAPPLIED OPTICS, 2012, 51 (09) : 1283 - 1286Su, Liming论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaWang, Yonggang论文数: 0 引用数: 0 h-index: 0机构: Acad Sinica, Res Ctr Appl Sci, Taipei 30010, Taiwan Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaLiu, Jie论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaFeng, Chao论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaFan, Xiuwei论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaZheng, Lihe论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaSu, Liangbi论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R ChinaXu, Jun论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China
- [5] Performance of chemical vapor deposition fabricated graphene absorber mirror in Yb3+ : Sc2SiO5 mode-locked laserOPTICAL ENGINEERING, 2014, 53 (12)Cai, Wei论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaLi, Yaqi论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaZhu, Hongtong论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaJiang, Shouzhen论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaXu, Shicai论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaLiu, Jie论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaZheng, Lihe论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Key Lab Transparent & Optofunct Inorgan Mat, Inst Ceram, Shanghai 201800, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaSu, Liangbi论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Key Lab Transparent & Optofunct Inorgan Mat, Inst Ceram, Shanghai 201800, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R ChinaXu, Jun论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Key Lab Transparent & Optofunct Inorgan Mat, Inst Ceram, Shanghai 201800, Peoples R China Shandong Normal Univ, Shandong Prov Key Lab Optic & Photon Device, Coll Phys & Elect, Jinan 250014, Peoples R China
- [6] Continuous-wave Yb-doped Sc2SiO5 thin-disk laserOPTICS LETTERS, 2012, 37 (01) : 37 - 39Wentsch, Katrin Sarah论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, GermanyWeichelt, Birgit论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge, D-70569 Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, GermanyZheng, Lihe论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, GermanyXu, Jun论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, GermanyAhmed, Marwan Abdou论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge, D-70569 Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, GermanyGraf, Thomas论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge, D-70569 Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence, D-70569 Stuttgart, Germany
- [7] Kerr lens mode-locked Yb:CALGO thin-disk laserOPTICS LETTERS, 2018, 43 (04) : 879 - 882Modsching, Norbert论文数: 0 引用数: 0 h-index: 0机构: Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandParadis, Clement论文数: 0 引用数: 0 h-index: 0机构: Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandLabaye, Francois论文数: 0 引用数: 0 h-index: 0机构: Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandGaponenko, Maxim论文数: 0 引用数: 0 h-index: 0机构: Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandGraumann, Ivan J.论文数: 0 引用数: 0 h-index: 0机构: ETH, Ultrafast Laser Phys, Inst Quantum Elect, CH-8093 Zurich, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandDiebold, Andreas论文数: 0 引用数: 0 h-index: 0机构: ETH, Ultrafast Laser Phys, Inst Quantum Elect, CH-8093 Zurich, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandEmaury, Florian论文数: 0 引用数: 0 h-index: 0机构: ETH, Ultrafast Laser Phys, Inst Quantum Elect, CH-8093 Zurich, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandWittwer, Valentin J.论文数: 0 引用数: 0 h-index: 0机构: Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, SwitzerlandSuedmeyer, Thomas论文数: 0 引用数: 0 h-index: 0机构: Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland Univ Neuchatel, Inst Phys, Lab Temps Frequence, Ave Bellevaux 51, CH-2000 Neuchatel, Switzerland
- [8] Graphene saturable absorber for diode pumped Yb:Sc2SiO5 mode-locked laserOPTICS AND LASER TECHNOLOGY, 2015, 65 : 1 - 4Cai, Wei论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaJiang, Shouzhen论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaXu, Shicai论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaLi, Yaqi论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaLiu, Jie论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaLi, Chun论文数: 0 引用数: 0 h-index: 0机构: Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaZheng, Lihe论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaSu, Liangbi论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R ChinaXu, Jun论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai 201800, Peoples R China Shandong Normal Univ, Coll Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Peoples R China
- [9] Kerr-lens mode-locked Yb3+:Lu2O3 thin-disk laser2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2016,Kreipe, Bernhard论文数: 0 引用数: 0 h-index: 0机构: Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germany Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germanyde Andrade, Jose Ricardo Cardoso论文数: 0 引用数: 0 h-index: 0机构: Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germany Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, GermanyKraenkel, Christian论文数: 0 引用数: 0 h-index: 0机构: Univ Hamburg, Inst Laserphys, Luruper Chaussee 149, D-22761 Hamburg, Germany Hamburg Ctr Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, GermanyMorgner, Uwe论文数: 0 引用数: 0 h-index: 0机构: Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germany Laser Zentrum Hannover eV, Hollerithallee 8, D-30149 Hannover, Germany Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germany
- [10] Ytterbium-doped Sc2SiO5 in thin-disk laser configurationLASER SOURCES AND APPLICATIONS, 2012, 8433Wentsch, K. S.论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, GermanyZheng, L.论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai, Peoples R China Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, GermanyXu, J.论文数: 0 引用数: 0 h-index: 0机构: Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, Shanghai, Peoples R China Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, GermanyWeichelt, B.论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge, Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, GermanyAhmed, M. Abdou论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge, Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, GermanyGraf, Th.论文数: 0 引用数: 0 h-index: 0机构: Univ Stuttgart, Inst Strahlwerkzeuge, Stuttgart, Germany Univ Stuttgart, Grad Sch Excellence Adv Mfg Engn, Stuttgart, Germany