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

ZENG Xiangui; XIA Jing; HU Tonghuan; YANG Qinglin

doi:10.7510/jgjs.issn.1001-3806.2015.03.002

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.

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

1. School of Physics and Microelectronics Science, Hunan University, Changsha 410082, China

Received Date: 2014-04-15

Accepted Date: 2014-05-06

Available Online: 2015-05-25

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

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