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同步抽运飞秒光参量振荡器(OPO)以及抽运源所构成的飞秒脉冲系统具有内在同步、多波长脉冲输出以及各脉冲的载波-包络相位(CEP)的内在关联等特性,在超宽频率梳以及脉冲的相干合成方面具有先天的优势.本文阐述了一系列该研究方向的最新成果,诸如探讨了OPO内载波-包络相位与能量守恒的关系,并通过实验进行了检验;利用自参考法控制了作为抽运源的飞秒钛宝石激光器CEP,并通过压电陶瓷(PZT)锁定了其脉冲重复频率;利用OPO产生的非相位匹配可见光,并以抽运光的超连续作为参考,通过OPO端镜上的快速PZT控制了OPO产生的所有脉冲的CEP,从而获得400nm～2.4μm超宽频率梳,控制精度高于1.2kHz带宽;并利用波长相近相位锁定的抽运光以及信号光倍频实现了不同脉冲的相位相干,为产生极窄的合成光脉冲打下了基础.
The femtosecond pulse system composed of synchronous pumping femtosecond optical parametric oscillator (OPO) and pumping source possesses characteristics such as intrinsic synchronization, multi-wavelength pulse output and carrier-envelope phase (CEP) of each pulse. Ultra-wide frequency comb and coherent pulse synthesis.This article describes a series of recent achievements in this field, such as the relationship between the carrier-envelope phase and energy conservation in OPO, which is verified by experiments. The self-reference method was used to control the femtosecond Ti: sapphire laser CEP as a pumping source, and its pulse repetition frequency was locked by piezoelectric ceramic (PZT). The non-phase matching visible light generated by OPO was used and the supercontinuum As a reference, a fast PZT on the OPO endoscope controls the CEP of all the pulses generated by the OPO, resulting in an ultra-wide frequency comb of 400 nm to 2.4 μm with a control accuracy of higher than 1.2 kHz bandwidth and pumped light with phase-locked phase lock As well as the signal frequency multiplier to achieve the phase coherence of different pulses, to create a very narrow synthetic light pulse laid the foundation.