ER-Doped Laser Transmitter for a 1.6µm-CO2 Differential Absorption LIDAR: - Er-doped laser crystals (Subproject A) - Fiber lased pumped, high-power, pulsed, single-frequency Er-doped laser transmitter for 1.6 µm-CO2DIAL (Subproject B)

用于 1.6 µm-CO2 差分吸收激光雷达的掺铒激光发射器： - 掺铒激光晶体（子项目 A） - 用于 1.6 µm-CO2DIAL 的光纤激光泵浦、高功率、脉冲、单频掺铒激光发射器（子项目B)

• 批准号: 69403964
• 负责人: Professor Dr. Günter Huber
• 金额: --
• 依托单位: Institut für Laser-Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/69403964?language=en
• 关键词: ER; Doped; Laser; Transmitter; 1.6

Subproject A:The goal of this subproject is to achieve diode laser pumped solid-state lasers which directly operate at the required lidar wavelengths near 1600 nm (1572 nm, 1579 nm, 1603 nm or 1609 nm) for C02. This way, simple and efficient laser systems can be realized and further investigated with respect to their scalability for lidar applications. Efficient new laser crystals for the proposed C02 lidar applications will be grown and optimized with respect to laser wavelength, active ion doping concentration, and optical quality. The crystals will be fully characterized with respect to their laser parameters and laser performance. Especially, Er-doped mixed garnet crystals and Er-doped sesquioxides are particularly most interesting candidates to address the lidar wavelengths and to achieve the goal of efficient, compact, and reliable diode pumped high power laser sources. Further interesting crystal candidates for wavelengths near 1.6 µm are Er-doped vanadates. These crystals exhibit high cross sections, high gain, and a versatility of laser wavelengths in the regions of interest. The most suitable Er-doped crystals realized in this project will be used for high power operation by the related subproject B of IPM ( Erbium laser transmitter ).Subproject B:A high-power, pulsed, single-frequency laser transmitter based on an Er-doped laser crystal shall be developed for a new CO2 differential absorption lidar (DIAL) system. Laser crystals with excellent quality will be grown and characterized within Subproject A. The laser will be pumped by a unique laser source, two cw 40-W average-power Erbium fiber laser units, which recently became commercially available. An extraordinary efficiency of the Er-laser transmitter can be expected by in-band pumping at about 1530 nm so that the laser will operate with a very small quantum defect. A special ring resonator in combination with the small thermal lensing of the Er-laser will ensure operation with an average power of more than 10 W at a repetition rate of about 1kHz as well as with high stability and reliability. By injection-seeding of frequency-stabilized, single-frequency diode lasers in the ring cavity, single-frequency and spectrally pure operation of the Erlaser will be achieved with a frequency stability of 10 MHz. Highly reproducible online/offline frequency switching required for DIAL measurements will be accomplished by two injection-seeders in combination with a fiber switch. It will be demonstrated that this system fulfills all requirements for accurate, range-resolved CO2-DlAL measurements.

子项目A：该子项目的目标是实现二极管激光器泵浦的固态激光器，其直接工作在所需的激光雷达波长1600 nm（1572 nm，1579 nm，1603 nm或1609 nm）附近的CO2。通过这种方式，可以实现简单高效的激光系统，并进一步研究其在激光雷达应用中的可扩展性。将在激光波长、活性离子掺杂浓度和光学质量方面生长和优化用于所提出的CO2激光雷达应用的高效新激光晶体。晶体将在其激光参数和激光性能方面得到充分表征。特别是，掺铒混合石榴石晶体和掺铒倍半氧化物是特别令人感兴趣的候选人，以解决激光雷达波长，并实现高效，紧凑，可靠的二极管泵浦高功率激光源的目标。波长接近1.6 μm的其他有趣的晶体候选物是掺铒的钒酸盐。这些晶体在感兴趣的区域中表现出高横截面、高增益和激光波长的多功能性。本项目中实现的最合适的掺铒晶体将用于IPM相关子项目B（铒激光发射机）的高功率工作。子项目B：将为新型CO2差分吸收激光雷达（DIAL）系统开发基于掺铒激光晶体的高功率、脉冲、单频激光发射机。将在子项目A中生长和表征具有优良质量的激光晶体。该激光器将由一个独特的激光源泵浦，这是两个连续40瓦平均功率的铒光纤激光器单元，最近已上市。通过在大约1530 nm处的带内泵浦，可以预期Er激光发射器的非凡效率，使得激光器将以非常小的量子缺陷工作。特殊的环形谐振腔与Er激光器的小热透镜相结合，将确保在约1 kHz的重复频率下以超过10 W的平均功率以及高稳定性和可靠性运行。通过在环形腔中注入稳频单频半导体激光器，可实现Er激光器的单频和光谱纯操作，频率稳定度为10 MHz。DIAL测量所需的高度可再现的在线/离线频率切换将由两个注入种子与光纤开关组合完成。它将被证明，该系统满足所有要求的准确，距离分辨CO2-DlAL测量。