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Updated: Mar 20, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
Published on: December 29, 2015
Note: A sub-sampling technique for frequency locking in Doppler wind lidar
Yuan Yao1, Feng Li1, Lian Chen1
1State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Abstract:
Double-edge technique is employed in Doppler wind lidar for detecting the Doppler frequency shift. A dedicated locking channel, employing one channel of a triple Fabry-Perot etalon, is designed to compensate for the effects caused by the frequency drift of outgoing laser. Agilent Oscilloscopes, with a sampling rate of 2.5 GSPS, are employed to obtain accurate amplitudes of the narrow pulses in existing experiments. In order to achieve the requirement of real-time ability and integration, a sub-sampling technique based on the theory of statistics is presented. With the technique, the drift can be acquired at a sub-sampling rate, 250 MSPS. A prototype is designed and the test results show that the prototype, providing real-time ability and better integration, has a comparable performance as the oscilloscope for frequency locking.
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