KEYWORDS: Laser stabilization, Bragg cells, Signal to noise ratio, Control systems, Field programmable gate arrays, Sensors, Optical tweezers, Telecommunications, Semiconductor lasers, Laser systems engineering
Levitated microspheres have enabled a wide variety of precision sensing applications which have caught great attentions in recent years. Optical tweezers technology is one of the most important methods of microspheres levitation. The stability of laser power directly affects the microspheres levitation and the precision of the measurement. This paper discusses the major factors of power stabilization in semiconductor laser. A PID-controlled model is used to control the feedback on the laser. The system mode is established after the analyzing of the characteristic of the model parameters. The experiment is demonstrated with a commercial semiconductor laser. With the external power stabilization module a 16dB laser power stability control is achieved at the relaxation oscillation, and the long-term stability is improved from 3% to 0.4%.
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.
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