近厘米量级失匹长度的超短脉冲全光被动同步技术

Ultrashort Pulse All-Optical Passive Synchronization Technology with Near-Centimeter-Scale Mismatch Length

实验采用主-从注入锁定方式搭建了基于全保偏光纤的全光被动同步超短脉冲激光光源,通过优化主激光器注入脉冲的脉冲能量和脉冲宽度实现了长达0.879 cm的失匹长度。所设计的同步光源包含基于非线性放大环形镜的掺铒光纤锁模脉冲激光器和掺镱光纤锁模脉冲激光器。其中,主掺铒光纤锁模激光器的中心波长为1560 nm,光谱宽度为5.01 nm。在输出单脉冲能量从0.06 nJ提升至3.26 nJ的过程中,输出脉冲经过掺铒光纤放大器后,最窄脉冲宽度和最宽脉冲宽度为221 fs和1.79 ps。从掺镱光纤锁模激光器中心波长为1064 nm,光谱宽度为0.22 nm,脉冲宽度为9.5 ps。所提技术方案通过控制掺铒光纤放大器的输出参数,实现了主掺铒光纤锁模激光器与从掺镱光纤锁模激光器间近厘米量级的腔长失匹范围,为免除同步光源中的时间延迟控制组件和光纤光路耦合组件提供了可行方案。

An all-optical passive synchronous ultrashort pulse laser source based on an all-polarization-maintaining fiber is built by the master-slave injection locking method.By optimizing the pulse energy and pulse width of pulse from the master laser,the mismatch length of 0.879 cm is achieved.The designed synchronous laser source consists of an erbiumdoped fiber mode-locked pulse laser(master laser)and a ytterbium-doped fiber mode-locked pulse laser(slave laser)based on nonlinear amplifying loop mirror.The central wavelength of the master laser is 1560 nm,and its spectral width is 5.01 nm.When the output single pulse energy is increased from 0.06 nJ to 3.26 nJ,the narrowest and widest pulse widths are 221 fs and 1.79 ps after the output pulse passes through the erbium-doped fiber amplifier.The central wavelength of the slave laser is 1064 nm,and its spectral width and pulse width is 0.22 nm and 9.5 ps respectively.By controlling the output parameters of the erbium-doped fiber amplifier,the tolerance range of cavity-length mismatch between the master and slave lasers approaches to centimeter level,which provides an efficient way to avoid using the time delay control components and fiber optical path coupling components in the synchronous laser source.