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首页> 外文期刊>Applied optics >Radio frequency controlled synthetic wavelength sweep for absolute distance measurement by optical interferometry
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Radio frequency controlled synthetic wavelength sweep for absolute distance measurement by optical interferometry

机译：射频控制的合成波长扫描，用于通过光学干涉仪进行绝对距离测量

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摘要

We present a new technique applied to the variable optical synthetic wavelength generation in optical interferometry. It consists of a chain of optical injection locking among three lasers: first a distributed-feedback laser is used as a master to injection lock an intensity-modulated laser that is directly modulated around 15 GHz by a radio frequency generator on a sideband. A second distributed-feedback laser is injection locked on another sideband of the intensity-modulated laser. The variable synthetic wavelength for absolute distance measurement is simply generated by sweeping the radio frequency over a range of several hundred megahertz, which corresponds to the locking range of the two slave lasers. In this condition, the uncertainty of the variable synthetic wavelength is equivalent to the radio frequency uncertainty. This latter has a relative accuracy of 10~(-7) or better, resulting in a resolution of +-25 (mu)m for distances exceeding tens of meters. The radio frequency generator produces a linear frequency sweep of 1 ms duration (i.e., exactly equal to one absolute distance measurement acquisition time), with frequency steps of about 1 MHz. Finally, results of absolute distance measurements for ranges up to 10 m are presented.
机译：我们提出了一种新技术，应用于光学干涉术中可变光学合成波长的产生。它由三个激光器之间的光学注入锁定链组成：首先，将分布式反馈激光器用作主激光器，以注入锁定由边带上的射频发生器直接在15 GHz左右调制的强度调制激光器。第二个分布式反馈激光器被注入锁定在强度调制激光器的另一个边带上。只需通过在数百兆赫兹范围内扫描射频即可简单地生成用于绝对距离测量的可变合成波长，该频率对应于两个从激光器的锁定范围。在这种情况下，可变合成波长的不确定度等于射频不确定度。后者的相对精度为10〜（-7）或更高，导致距离超过数十米时分辨率为+ -25μm。射频发生器产生持续时间为1 ms的线性频率扫描（即，精确等于一个绝对距离测量获取时间），频率步长约为1 MHz。最后，给出了最大距离为10 m的绝对距离测量结果。

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