Investigation and development of a pulsed laser system in rod geometry thought for pumping a lidar system for atmospheric research

研究和开发棒几何形状的脉冲激光系统，考虑用于泵浦激光雷达系统进行大气研究

• 批准号: 5414830
• 负责人: Professor Dr. Martin Ostermeyer
• 金额: --
• 依托单位: IBL Innovative Berlin Laser GmbH
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5414830?language=en
• 关键词: Investigation; development; pulsed; laser; system

An efficient diode pumped, pulsed high power laser system based on a rod geometry will be developed as a pump source for a lidar system. The laser will be power-scalable and provide average output powers in excess of 400 W at relatively low repetition rates ranging from 100 - 1000 Kz and pulse durations in the range of 10 - 100 ns. It will embody a diffraction limited beam quality. Small bandwidth and high frequency stability are achieved via injection seeding technique. The thermally induced birefringence in the laser rods is compensated utilizing polarization rotation and in addition imaging the laser rods onto each other. The challenge to maintain the beam quality while power scaling the laser system, will be overcome, e.g. by optical phase conjugate mirrors. Potential laser materials are Nd:YAG and Yb:YAG. They will be compared to other materials with longer fluorescence lifetimes of the upper laser level. An important accomplishment will be the frequency doubling of the laser light around 1 µm wavelength to the green with an efficiency greater than 50 %. Diode pumped pulsed laser systems with these specifications are not available yet but they are essential as a fundamental pump source for operational lidar systems of the next generation.

一个高效的二极管泵浦，脉冲高功率激光系统的基础上棒的几何形状将被开发作为激光雷达系统的泵浦源。激光器将是功率可缩放的，并且在100 - 1000 Kz范围内的相对低的重复率和10 - 100 ns范围内的脉冲持续时间下提供超过400 W的平均输出功率。它将体现衍射极限光束质量。通过注入种子技术实现了小带宽和高频率稳定度。激光棒中的热致双折射利用偏振旋转并且另外使激光棒彼此成像来补偿。在功率缩放激光系统的同时保持光束质量的挑战将被克服，例如通过光学相位共轭镜。可能的激光材料是Nd：YAG和Yb：YAG。它们将与具有更长的上激光能级荧光寿命的其他材料进行比较。一个重要的成就将是1微米波长左右的激光倍频到绿色，效率超过50%。具有这些规格的二极管泵浦脉冲激光系统还不可用，但它们作为下一代操作激光雷达系统的基本泵浦源是必不可少的。