【摘要】 傅里叶域锁模(FDML)激光器是高速度、高分辨率光学相干断层成像(OCT)系统的核心光源，但其输出功率与扫频范围相互制约，限制了系统信噪比与分辨率的同步提升。为揭示并优化FDML腔内的能量调控物理机制，本文通过自主搭建FDML实验系统，并结合节点损耗模型，系统研究了输出耦合节点位置与耦合比对腔内稳态能量分布及输出光谱的影响。研究发现，通过重构特定节点的腔内损耗，可有效调控增益饱和效应与光子循环效率，从而优化输出性能。实验结果表明，在1 310 nm的中心波长处，采用优化后的输出耦合方案，BOA在600 mA的工作电流下，最大平均输出功率提升至39.27 mW,-3 dB光谱扫频范围拓展至119.69 nm。该研究为突破FDML激光器功率-带宽积的技术瓶颈提供了明确的物理阐释与有效的实验方案，对推动高速高精度OCT技术发展具有积极意义。更多还原

【Abstract】 Fourier-Domain Mode-Locked(FDML) lasers are the core light sources of high-speed and high-resolution Optical Coherence Tomography(OCT) systems. However, their output power and swept frequency range are mutually constrained, limiting the simultaneous improvement of system signal-to-noise ratio and resolution. To reveal and optimize the physical mechanism of energy regulation within the FDML cavity, this paper systematically studies the effects of output coupling node position and coupling ratio on the steady-state energy distribution and output spectrum by independently building an FDML experimental system and combining with a node loss model. The study finds that by reconstructing the intracavity loss of specific nodes, the gain saturation effect and photon recycling efficiency can be effectively regulated, thereby optimizing the output performance. Experimental results show that at a central wavelength of 1 310 nm, with an optimized output coupling scheme, the maximum average output power of the BOA is increased to 39.27 mW at an operating current of 600 mA, and the-3 dB spectral swept range is extended to 119.69 nm. This research provides a clear physical explanation and an effective experimental scheme for breaking through the technical bottleneck of the power-bandwidth product of FDML lasers, which is of positive significance for promoting the development of high-speed and high-precision OCT technology.更多还原