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在线性调频激光绝对测长技术中采用平面镜外腔半导体激光器，实现了在无导轨条件下的大长度绝对测量，测量范围达到１０米，测量不确定度为１０－４。
The use of flat-mirror external cavity semiconductor lasers in linear FM laser absolute length measurement technology enables large length absolute measurement without a rail, with a measurement range of 10 meters and an uncertainty of measurement of 10-4.