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ZENG Xiangui, XIA Jing, HU Tonghuan, YANG Qinglin. Laser power measurement systems based on lock-in amplifiers and LabVIEW[J]. LASER TECHNOLOGY, 2015, 39(3): 295-299. DOI: 10.7510/jgjs.issn.1001-3806.2015.03.002
Citation: ZENG Xiangui, XIA Jing, HU Tonghuan, YANG Qinglin. Laser power measurement systems based on lock-in amplifiers and LabVIEW[J]. LASER TECHNOLOGY, 2015, 39(3): 295-299. DOI: 10.7510/jgjs.issn.1001-3806.2015.03.002

Laser power measurement systems based on lock-in amplifiers and LabVIEW

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  • Received Date: April 14, 2014
  • Revised Date: May 05, 2014
  • Published Date: May 24, 2015
  • In order to reduce the impact of noise on laser optical experiments, a lock-in amplifier and an optical chopper were used. The laser was modulated at a specific frequency by the chopper and the frequency was sent to the lock-in amplifier as a reference signal. The useful signal was extracted with the lock-in amplifier based on the coherent detection method. In order to relieve the operator's labor during experiments, an automatic software system under LabVIEW software platform was developed to operate the experiments and record data automatically, which greatly simplified the operation process. The results show that measurement noise of this method reduced from 9.1% to 4.7% compared with laser intensity measurement with a power meter directly. The automatic software system saves more than 50% of time compared with manual recording of data.
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