Optical fiber light trap acceleration measurement device

Abstract

The invention discloses an optical fiber light trap acceleration measurement device, belonging to the fields of inertia measurement technology and optical engineering. Four optical elements in the measurement device are arranged in a cross groove of an optical fiber fixing substrate respectively; transparent solution is capsulated in the crossing position of the cross groove; the output end face of the optical element is aligned with spherical particles in the transparent solution, the distance between output end faces of two opposite optical elements is between 50 and 800 microns; output ends of four monomode optical fibers are coupled in corresponding optical elements respectively, while input ends thereof are connected with a light intensity modulator; light emitted by a laser is modulated into four beams of light with the same light intensity through the light intensity modulator, and the four beams of light are input into the four monomode optical fibers respectively; an photoelectric image detector is arranged right above the cross position of the cross groove; and the photoelectric image detector and the light intensity modulator are respectively connected with a processor. The device has the advantages of even light intensity distribution and small radial gradient force, has high measurement sensitivity, and reduces the requirement on alignment accuracy of the beam.

Description

[0001] Technical Field The present invention relates to a four-beam fiber optic trap acceleration measurement device, which belongs to the fields of inertial measurement technology and optical engineering. Background technique [0002] According to quantum theory, a light beam is a group of photon streams moving at the speed of light and having both mass and momentum. When the light beam is refracted and reflected on the surface of the medium, the speed and direction of the photon change, resulting in a change in its momentum vector. According to the law of conservation of momentum, the change in momentum of photon is equal to the change in momentum of particle. Therefore, the momentum of the particle changes accordingly, that is, the effect of the light beam on the particle, which is called the light radiation pressure. Studies have shown that the light radiation pressure includes the scattering force along the beam propagation direction and the gradient force always pointin...

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Problems solved by technology

[0004] The disadvantage of this device is that the laser output from the fiber is a fundamental-mode Gaussian beam with uneven light intensity distribution.

Due to the uneven distribution of light intensity, the gradient force pointing to the strong light intensity is two orders of magnitude larger than the scattering force along the beam propagation direction, so the movement of the particles is mainly affected by the radial gradient force of the two pairs of outgoing lasers. The formula F= It can be seen that the measurement accuracy of the real-time measurement acceleration of the device will be affected

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