Infrared and Laser Engineering, Volume. 52, Issue 7, 20220872(2023)
Optical measurement method of shot noise limit micro-vibration based on optical polarization control
Figures & Tables(11)
Fig. 3. Experimental optical path for measuring micro-vibration signal of object
Fig. 4. (a) Optical path of frequency shift optical; (b) Physical diagram of AOM; (c) 5.5 MHz beat frequency test results
Fig. 5. (a) Micro-vibration signal optical path diagram; (b) Physical diagram of PZT; (c) Vibration displacement calibration of PZT
Fig. 6. (a) Balanced heterodyne detection optical path; (b) Balanced detector
Fig. 7. (a) Noise power spectrum data of Span=10 MHz; (b) Experimental optical path
Table 1. Test conditions for noise power measurement
View tableView in ArticleTable 1. Test conditions for noise power measurement
No. Test conditions 1 Local-oscillator power: 2 mW/4 mW/8 mW 2 Modulation frequency of AOM1: 80 MHz 3 Modulation frequency of AOM1: 85.5 MHz 4 Center frequency of spectrometer: 5.5 MHz 5 Spectrum analyzer bandwidth: 100 Hz 6 Resolution bandwidth of spectrometer: 1 Hz 7 Video bandwidth of spectrometer: 1 Hz 8 Average count: 100 9 Optical heterodyne contrast: 0.9 10 System optical power correction value: 0.63 11 Detector quantum efficiency: 0.69 12 Receiver feedback resistance: 5 kΩ 13 Receiver load resistance: 50 Ω 14 PZT amplitude modulation: 1 Vpp 15 PZT waveform modulation: Triangle wave 16 PZT frequency modulation: 2-10 Hz
Table 2. Experimental results from 2-10 Hz
View tableView in ArticleTable 2. Experimental results from 2-10 Hz
$ f $ $\varGamma$ $ \Delta {L_{ex}} $ ${P_S}/$ $10^{ - 18} \;{\rm{W}}$ 2 0.0051 11.99 1.23 3 0.0046 11.34 0.97 4 0.0047 11.47 1.01 5 0.0046 11.34 1.03 6 0.0048 11.60 1.18 7 0.0044 11.08 0.96 8 0.0047 11.47 1.07 9 0.0046 11.34 1.09 10 0.0046 11.34 1.04 Avg 0.00468 11.44 1.06
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Kaikai Wu, Boya Xie, Lin Chen, Songqing You, Zhewen Xiong, Peng Yang. Optical measurement method of shot noise limit micro-vibration based on optical polarization control[J]. Infrared and Laser Engineering, 2023, 52(7): 20220872
Paper Information
Category: Photoelectric measurement
Received: Jan. 10, 2023
Accepted: --
Published Online: Aug. 16, 2023
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