用于皮秒種子鎖模穩(wěn)定檢測(cè)的脈沖重頻測(cè)量方法
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關(guān)鍵詞：皮秒鎖模激光器；脈沖重復(fù)頻率；可編程門陣列；等精度周期測(cè)量；濾波處理 中圖分類號(hào)： TM935.44 文獻(xiàn)標(biāo)志碼：A DOI：10.12305/j.issn.1001-506X.2025.03.03
Pulse repetition frequency measurement method for picosecond seed mode-locked stability detection
ZHANG Zhenguo 1，2 ，MA Teng1，2，ZHUANG Mingjin1，LI Mingshan ， MENG Dongdong1，F(xiàn)AN Zhongwei2，* （1. Aerospace Information Research Institute， Chinese Academy of Sciences，Beijing lOoo94，China; 2.University ofChineseAcademyofSciences，Beijinglooo49，China）
Abstract：Aiming at the problem of seed-source mode-locked stability monitoring of picosecond lasers，a digital measurement systemof laser pulserepetition rate based on field programmable gatearray（FPGA）is designed.The systemuses multiplephase-shifted high-frequency standard clock signals generated by the phase locked loop（PLL）ofFPGA to count and measure the time gate generated by the input optical pulse signal，and uses the method of amplitude limiting filter and arithmetic average filter to obtain moreaccurateand stable frequency measurements to strengthen the anti-jamming ability of the system.The proposed system measures the signal to be measured at 80MHz ，the theoretical measurement accuracy can reach 31.7Hz ，and the relative accuracy can reach 3.96×10-7 .According to the experimental test results，the actual accuracy is about 18Hz ， and the relative accuracy is 2.25×10-7 ，the system design is verified to meet the accuracy requirements.The result shows that the proposed system can accurately sense the repetition frequency change of picosecond seed laser pulse in MHz ，which provides a basis for further judgment and control of mode-locked stability，and also has significant reference value for other industrial frequency measuring devices design.
Keywords：picosecond mode-locked laser；pulse repetition rate； field programmable gate array （FPGA）； equal precision periodic measurement；filter processing
0 引言
激光鎖模技術(shù)廣泛應(yīng)用于產(chǎn)生超短脈沖激光，目前通過(guò)鎖模可以實(shí)現(xiàn)皮秒甚至飛秒量級(jí)的脈沖激光輸出[1-2]。（剩余14733字）