掺铥无序石榴石晶体制备及其2.3μm波段高效连续及超短脉冲激光研究

激光在关系国计民生的各个领域有重要应用需求，可实用激光材料的研制和关键科学问题的解决是激光发展的基础。处于“人眼安全”波段的2.3μm激光是激光领域的研究热点之一且亟需发展。Tm3+的3H4→3H5电子跃迁是实现2.3μm激光的重要技术，但Tm3+的3H4能级寿命易猝灭、量子亏损大易引起强的热效应限制了该波段激光的发展。前期研究表明，能量上转换效应的有效利用可从源头上突破量子极限的限制、降低量子亏损和热效应，是获得高效2.3μm激光的重要新途径。本项目针对2.3μm激光的发展瓶颈，提出以Tm3+掺杂无序石榴石为代表性研究对象，探索其能量上转换效应，从源头上量化的揭示系列关键参数和限制激光效果的关键难题。在获得高效连续激光输出的基础之上进一步开展Tm3+离子2.3μm超短脉冲激光的研究工作。并将研究的切入点放在局域配位结构的调控与性能研究上。最终达到获得高效连续及超短脉冲激光输出的双重目的。

Laser is a critical issue related to the people's livelihood, and the research on practical laser materials and key scientific problems is the foundation of the lasers. Lasers in the eye-safe spectral region around 2.3μm are now a hot topic in laser regimes, and this laser is urgently required to be developed. The 3H4→3H5 transition of Tm3+ ions can emit the 2.3μm photons and the lasing based on this transition is an important technique for the 2.3μm lasers. However, the upper laser lifetime (3H4) may be easily quenched due to different reasons. And the large quantum defects determining strong thermal effects, both of constrained the development of practical gain media and laser devices. In this project, aiming at the bottleneck of 2.3μm lasers, we propose to choose the novel Tm3+-doped disordered garnet as the 2.3μm laser materials, and study the growth and effects of energy-transfer upconversion (ETU) to get a quantitative evaluation between the key parameter and laser structure-activity. On the basis of high efficient cw laser, the next work will focus on the generation of ultra-short pulse. The research entry point will focus on on regulating the local ligand fields and studying the spectra performance. And at last, to achieve the aims of high efficient cw and ultra-short pulse laser.