为对飞秒级超快过程进行可调曝光间隔的实时探测，需要获得共线传输的飞秒级脉冲间隔可调的子脉冲串。提出一种基于双折射原理的脉冲间隔连续可调的楔形晶体分束方法，该方法具有子脉冲能量均等、相似度高、分束结构简单紧凑且容易嵌入到光学系统中的优点。数学上推导了子脉冲脉冲间隔与晶体尺寸、结构角及移动距离的精确表达式。在晶体尺寸和结构角确定之后，子脉冲脉冲间隔随晶体移动距离呈线性变化关系。理论分析了误差项和色散等因素对分束结果造成的影响。模拟计算和干涉实验结果验证了基于双折射原理的脉冲间隔连续可调的晶体分束方法的可行性，为实现飞秒级脉冲间隔的多脉冲分束提供了借鉴。

To achieve real-time detection with adjustable exposure interval in ultrafast events, a triple-wedge crystal pulse splitting method with continuously adjustable pulse interval is proposed for obtaining collinear propagated sub-pulses. The generated sub-pulses have the characteristics of equal energy and high similarity. Moreover the compact structure of the triple-wedge crystal makes it easier to be embed into the optical system. The accurate relationship between the pulse interval and the structural angle，dimension and moving distance of the birefringent crystal is mathematically derived. A linear relationship exists between the pulse interval and the moving distance of the crystal at a given structural angle and crystal size. The impacts of error terms and dispersion on the pulse interval are theoretically analyzed. The feasibility of the proposed method is confirmed by mathematical analyzation and experimental results. The results will provide a reference knowledge base for multi-pulse splitting.