An actively mode-locked Ho： YAG laser pumped by a diode-pumped Tin-doped fiber laser is reported. For the cw operation, we obtain the maximum output power of 3.43 W with a central wavelength 2022.2nm at the maximum i...An actively mode-locked Ho： YAG laser pumped by a diode-pumped Tin-doped fiber laser is reported. For the cw operation, we obtain the maximum output power of 3.43 W with a central wavelength 2022.2nm at the maximum incident pump power of 11.4 W, corresponding to a slope efficiency of 34.5%. The beam quality factor M2 is 1.16, and the output beam is close to fundamental TEMoo. In the case of the CWML operation, a stable pulse train is generated with an average output power up to 3.41 W with a slope efficiency of 34.3% at the incident pump power of 11.4 W and a pulse duration of 294ps at a repetition rate of 81.92MHz. In addition, the maximum single pulse energy is 41.6nJ.展开更多
该文以某楼房作为研究对象,探究基于三维激光扫描的建筑立面测绘与三维模型构建技术。在现场踏勘基础上确定测站位置,在测站架设三维激光扫描仪获取点云数据后,依次采取点云配准、点云去噪、数据精简等预处理措施,提高点云数据质量。将...该文以某楼房作为研究对象,探究基于三维激光扫描的建筑立面测绘与三维模型构建技术。在现场踏勘基础上确定测站位置,在测站架设三维激光扫描仪获取点云数据后,依次采取点云配准、点云去噪、数据精简等预处理措施,提高点云数据质量。将点云数据封装后导入Geomagic Studio 2012软件中构建点云模型,经过模型孔洞修补后检测精度,点位精度误差为0.003 m,满足建模要求。将点云格式更改为las格式后输入到AutoCAD软件中绘制立面图,并使用建筑立面图和数码照片得到目标建筑物的三维实体模型,为建筑管理维护提供依据。展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 61308009 and 61405047the China Postdoctoral Science Foundation Funded Project under Grant Nos 2013M540288 and 2015M570290+2 种基金the Fundamental Research Funds for the Central Universities Grant under Grant Nos HIT.NSRIF.2014044 and HIT.NSRIF.2015042the Science Fund for Outstanding Youths of Heilongjiang Province under Grant No JQ201310the Heilongjiang Postdoctoral Science Foundation Funded Project under Grant No LBH-Z14085
文摘An actively mode-locked Ho： YAG laser pumped by a diode-pumped Tin-doped fiber laser is reported. For the cw operation, we obtain the maximum output power of 3.43 W with a central wavelength 2022.2nm at the maximum incident pump power of 11.4 W, corresponding to a slope efficiency of 34.5%. The beam quality factor M2 is 1.16, and the output beam is close to fundamental TEMoo. In the case of the CWML operation, a stable pulse train is generated with an average output power up to 3.41 W with a slope efficiency of 34.3% at the incident pump power of 11.4 W and a pulse duration of 294ps at a repetition rate of 81.92MHz. In addition, the maximum single pulse energy is 41.6nJ.
文摘该文以某楼房作为研究对象,探究基于三维激光扫描的建筑立面测绘与三维模型构建技术。在现场踏勘基础上确定测站位置,在测站架设三维激光扫描仪获取点云数据后,依次采取点云配准、点云去噪、数据精简等预处理措施,提高点云数据质量。将点云数据封装后导入Geomagic Studio 2012软件中构建点云模型,经过模型孔洞修补后检测精度,点位精度误差为0.003 m,满足建模要求。将点云格式更改为las格式后输入到AutoCAD软件中绘制立面图,并使用建筑立面图和数码照片得到目标建筑物的三维实体模型,为建筑管理维护提供依据。
