基于石墨烯可饱和吸收体的宽间隔多波长被动锁模固体激光器运转机理研究

Wavelength space of tens or hundreds of nanometers ultrafast laser has been a important topic in the field of laser technology. This laser can excite the material energy state, and capture the complex energy band transition information at the same time.Even the properties of the substance will be achieved in this process. However, the limition of the current semiconductor saturable absorber modulate linewidth , resulting in the wide space wavelength of tens or hundreds nanometer still can not be achieved in the laser. Here we proposed a new project to use a kind of novel graphene saturable absorber as the passive mode-locking device to realize the multi-wavelength mode lock in this kind laser,its wide modlulation linewidth and satuaraion characteristics properties is very useful to this kind laser. The theory simulation of the mechanism of passively mode-locked based on graphene and the formation process of multi wavelength ultrashort laser pulse will be carried out in a LD pumped Nd:YVO4 laser.And the synchronous output parameters will be achieved based on the model, thus the 916nm，1064nm and 1320nm multi-wavelength passive mode-locked laser will be realized in the experiment. In this research we will find the key technology of wide space multi-wavelength passive mode-locked laser based on graphene. To the best of our knowledge,this will be the first time of realize the multi wavelength mode locking using the graphene,and this will broaden human's ability to control the microscopic world,which has a very important scientific value.

宽间隔多波长超快激光是指波长间隔为几十至几百纳米的短脉冲激光，这种激光由于波长间隔大，在复杂能级跃迁的超快动力学研究中具有非常重要的应用，一直是超快激光技术领域的研究热点。但是，由于半导体可饱和吸收体调制带宽较窄，难以覆盖固体激光介质的发射主峰波长，使得宽间隔多波长固体超快激光器的研究受到了限制。本项目提出采用石墨烯进行这种激光技术的探索性研究，充分利用石墨烯的超长调制线宽和优异的可饱和吸收特性，以半导体泵浦的Nd:LuVO4激光器为例，通过理论分析和实验研究，深入探讨石墨烯可饱和吸收体实现宽间隔多波长被动锁模的机理，实现可控的916nm、1064nm和1340nm多波长被动锁模同步激光输出。本研究具有基础性和前瞻性，一旦实现突破，将带动微观探测等相关技术领域的快速发展，具有重要的科学价值和实际意义。

项目进行了Nd:LuVO4双波长锁模技术的研究， 进行Nd:LuVO4多波长连续波激光器的研究，寻求实现多波长输出的条件，同时探索石墨烯在双波长激光器中实现锁模的条件。通过谐振腔设计，泵浦条件控制，同时设计输出率可调的中心波长分别位于1064nm和1342nm附近，实现双波长激光输出，平均输出功率为0.5W。项目执行期间发表SCI收录论文6篇，其中第一作者SCI收录论文4篇，申请发明专利4项。圆满完成项目研究目标。