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| 1 | 冷水珊瑚丘的高分辨率成像显示文摘冷水珊瑚(CWC)丘是一种生物成因的持久的形态结构,主要由钙化的冷水珊瑚和半远洋沉积物组成,形成复杂的深海微生物栖息地。它发育于全球范围内,尤其在欧洲大西洋边缘。本文利用高分辨率图像识别爱尔兰Porcupine Seabight海岸Piddington冷水珊瑚丘的冷水珊瑚种分布与分区特征。本文利用基于海洋对象的图像分析方法和不同的机器学习分类方法(决策树、逻辑回归和深度神经网络)对分辨率高达2 mm的珊瑚礁视频和ROV釆集的多波束数据进行分析,研究珊瑚骨架的空间结构特征和冷水珊瑚丘的环境因素。研究结果显示,利用上述方法能进行精确的定量预测,珊瑚骨架和海绵不均匀地覆盖于冷水珊瑚丘的局部地方,珊瑚覆盖率为14.5%(其中活珊瑚约2%,死珊瑚约12.5%),海绵覆盖率约3.5%。这是首次对整个冷水珊瑚丘上的活珊瑚和死珊瑚骨架以及海绵进行量化。该方法可用于栖息地研究及保护,为碳收支评估提供量化工具,并为评估冷水珊瑚丘的变化提供基准。该方法可改进应用于其他栖息地。 | Luis A.Conti Aaron Lim Andrew J.Wheeler 曲佳(翻译) 张伙带(校对) | 2019 | 海洋地质2019，0，2： | 0 |
| 2 | Spectral broadening for multi-Joule pulse compression in the APOLLON Long Focal Area facility显示文摘Spectral-broadening of the APOLLON PW-class laser pulses using a thin-film compression technique within the longfocal-area interaction chamber of the APOLLON laser facility is reported,demonstrating the delivery of the full energy pulse to the target interaction area.The laser pulse at 7 J passing through large aperture,thin glass wafers is spectrally broadened to a bandwidth that is compatible with a 15-fs pulse,indicating also the possibility to achieve sub-10-fs pulses using 14 J.Placing the post-compressor near the interaction makes for an economical method to produce the shortest pulses by limiting the need for high damage,broadband optics close to the final target rather than throughout the entire laser transport system. | P.-G.Bleotu J.Wheeler D.Papadopoulos M.Chabanis J.Prudent M.Frotin L.Martin N.Lebas A.Freneaux A.Beluze F.Mathieu P.Audebert D.Ursescu J.Fuchs G.Mourou | 2022 | High Power Laser Science and Engineering2022，10，2： | 0 |
| 3 | Post-compression of high-energy,sub-picosecond laser pulses显示文摘The post-compression technique based on self-phase modulation of high-energy pulses leads to an increase in achievable peak power and intensity.Typically,the pulses considered in experiments have been less than 100 fs in duration.Here,the method is applied to the ELFIE laser system at the LULI facility,for a pulse of 7 J energy and an initial measured duration of 350 fs.A 5-mm-thick fused silica window and a 2 mm cyclic-olefin polymer were used as optical nonlinear materials.The 9 cm diameter beam was spectrally broadened to a bandwidth corresponding to 124 fs Fourier-limited pulse duration,and then it was partly post-compressed to 200 fs.After measuring the spatial spectra of the beam fluence,a uniform gain factor of 4 increase in the fluctuations over the studied range of frequencies is observed,due to small-scale self-focusing. | P.-G.Bleotu J.Wheeler S.Yu.Mironov V.Ginzburg M.Masruri A.Naziru R.Secareanu D.Ursescu F.Perez J.De Sousa D.Badarau E.Veuillot P.Audebert E.Khazanov G.Mourou | 2023 | High Power Laser Science and Engineering2023，11，2： | 0 |
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