A Design Method for Beam Shaping of Spherical Air Chamber Pumped Laser System

Abstract

The present invention is a design method for shaping the beam of a laser system pumped by a spherical air chamber. The specific steps are as follows: Step 1. Use a beam quality analyzer to test the size of the light spot passing through the air chamber at multiple places, and obtain the beam shape of the laser beam after calculation. The coordinates of the intersection point of the refracted light behind the air chamber and the air chamber; Step 2, use Tracepro software, simulate the light spot through the spherical air chamber to form a spot that is the same as the coordinates in Step 1, the refractive index and thickness of the spherical air chamber; Step 3, after Calculate the focal length of the air chamber and the aperture of the free-form surface lens; step 4, design the initial structure of the free-form surface lens; step 5, model in Tracepro software, and realize the optimal design of the free-form surface lens, and realize the uniformity of the spherical air chamber Polarization, the method can satisfy the beam shaping design required for the polarization and detection of the spherical air chamber by the pumping laser system and the detection laser system, and the method of the present invention can be used for extremely weak in the field of magnetic detection.

Description

technical field [0001] The patent of the present invention relates to the field of extremely weak magnetic detection, the design of laser beam shaping in a high-sensitivity Serf atomic inertial measurement device, and specifically a design method for beam shaping of a spherical gas chamber pumping laser system. Background technique [0002] The atomic inertial measurement device based on Serf state can realize ultra-sensitive inertial measurement, which greatly exceeds the sensitivity achieved by existing related measurement methods, challenges the sensitivity limit of magnetic field and inertial measurement, and enables human beings to obtain new tools for understanding the world. The beam expansion design is shaped into a flat top beam, and the size of the beam spot after the beam expansion is required to cover the size of the alkali metal gas chamber to achieve uniform polarization of the alkali metal atoms. Under the action of the external angular velocity, the spin state...

AI Technical Summary

Problems solved by technology

[0003] At present, the two sets of inertial measurement devices developed by Princeton University simply expand the pump light system through lens groups or beam expanders so that the light spot can cover the alkali metal gas chamber. The inertial measurement devices developed by Beihang University and Southeast University The measurement device uses the same method to expand the beam. The above method ensures that the light spot covers the alkali metal gas chamber through experimental modulation, and at the same time causes the complexity of the installation process. The most important thing is that the angle of the beam incident on the alkali metal gas chamber is not considered. Refraction will occur when incident, resulting in the deviation and unevenness of the polarization spot, especially for spherical air cells, the phenomenon is more serious

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