面向DIAL应用的单频光纤激光的稳频与放大技术

本项目拟利用光纤激光器在近红外波段的丰富波长资源，发展满足DIAL大气分子探测要求的新型激光系统，以解决制约DIAL技术发展光源瓶颈问题。通过研究HC-PCF吸收池的气体饱和吸收特性及其影响因素，提出能改善稳频精度的HC-PCF优化设计参数，解决全光纤型低压HC-PCF气体腔的研制技术问题，实现对单频光纤激光器的高精度稳频；通过抑制SBS效应对单频高功率光纤放大器输出功率的影响，解决低占空比单频脉冲光纤放大过程中的波形失真与噪声积累问题，构建满足DIAL系统应用要求的光纤型MOPA激光光源系统。通过本项研究，将为新型实用化DIAL光纤激光光源系统的发展奠定理论与技术基础，具有极其重要的科学意义和实用价值。

This research project plans to find new solutions to the laser source "bottlenecks" obstructs hindering the current differential absorption lidar(DIAL) systems for atmospheric molecule exploration applications by utilizing the rich wavelength resources of near-infrared region fiber laser techniques. By studying the influences of the specifications of the hollow-core photonic crystal fiber (HC-PCF) on the saturable absorption characteristics of the gas filled in the HC-PCF, we can obtain the optimized specifications of the HC-PCF for developing the gas-filled HC-PCF cell with very narrow saturable absorption spectrum, and achieve the high-precision frequency stabilization for the single-frequency fiber laser by using the narrow absorption peak of the developed the all-fiber low-pressure gas-filled HC-PCF cell as the frequency reference. A high power single-frequency laser fiber amplifier system may be developed by having suppressed the stimulated Brillouin scattering (SBS) effect in the single-frequency light signal fiber amplification, weakened the waveform distortion caused by the gain dynamics of rare-earth doped fibers and decreased the amplified spontaneous emission (ASE) noise accumulation generated in the low duty cycle pulse fiber amplification. Finally, a maser -oscillator power-amplifier (MOPA) fiber laser system may be constructed with the developed high-precision frequency-stabilized single-frequency fiber laser and high power single-frequency laser fiber amplifier system required for the demands in DIAL applications. Obiously, executing this project plan will definitely establish a solid theoretical and technical foundation for the development of new generation of DIAL laser source system, and thus, holds an remarkable significance in both scientific research and technological progress.