In this paper, the gradient force and scattering force of two kinds of different sinusoidal modulated Gaussian beams (SMGBs(n=2), SMGB (n=4)) and Gaussian beam (Gb) are analyzed, and their ability to capture particles are studied. It is found that sinusoidal modulated Gaussian beams have multiple stable capture positions at the focal plane than Gaussian beam. Under the same circumstance, Monte Carlo stochastic simulation method is used to simulate the tendency characteristics of particles under the effect of gradient force and scattering force, which verifies the theoretical analysis results. Therefore, the research results of this paper have certain guiding significance in the experiment and application of multi-position optical tweezers.
The environmental noise in interferometric fiber optic gyroscopes (IFOGs) has a significant impact on the self-noise and angle random walk (ARW) at 0-100Hz, the bandwidth commonly used in applications. The stability of the structure affects mostly bandwidths larger than 10Hz, while the airflow in the environment mainly affects that lower than 20Hz. The self-noise in a well-fixed structure and a nonwind room is experimentally demonstrated as 1.3441×10-8 rad/s/√Hz and 2.3896 ×10-8 rad/s/√Hz, 9.08dB and 9.23dB lower than that with environmental noise, respectively, at 100Hz in the 9-km IFOG. This proves that it is essential to avoid environmental noise for the use and testing of high-precision IFOGs.
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