Laser beam detection device and method based on ENZ theory

Abstract

A laser beam detection device and method based on an ENZ theory, and belongs to the technical field of laser. The laser beam detection device and method in the prior art has the defects of being cumbersome in operating steps, low in detection precision, hard to improve the resolution ratio, low in signal-to-noise ratio and high in cost. The device charge coupled device (CCD) detector is connected with a data processing computer. An imaging lens is arranged ahead of the CCD detector. The light-sensitive surface of the CCD detector and the focal plane c of the imaging lens are in parallel. The CCD detector is fixed on a slider. A guide slider mechanism is composed of the slider and a guide. The method takes the detected laser beam flare intensity image in the imaging lens focal plane c and the symmetrical front out-of focal plane a and the back out-of focal plane b and adopts an ENZ polynomial structure wave-front fitting coefficient to get an equation set. The multiple wave-front coefficient value correlation of the wave-front of the fitting pupil flat surface laser beam is obtained by solving the equation set, and then the high order error is eliminated by iterative algorithm and the accurate wave-front fitting coefficient value is got, thereby obtaining the phase position and the amplitude of the pupil flat surface laser beam. The characteristic value is calculated through moment method according to phase position and intensity information.

Description

technical field [0001] The invention relates to a laser beam detection device and method based on the ENZ theory. The laser beam detection device belongs to a laser wavefront and eigenvalue detection device, which can complete high-precision measurement of the laser wavefront. The laser beam detection device It can also be used as a wavefront detection device in laser communication, and the laser beam detection method can complete the calculation of laser related eigenvalues, and belongs to the field of laser technology. Background technique [0002] Lasers have been widely used in all walks of life, and laser testing equipment is also various. As the requirements for various technical indicators of the laser are getting higher and higher, the requirements for the laser detection equipment are also getting higher and higher. The existing wavefront detection device is a Hartmann wavefront sensor, which is used for laser measurement, laser communication, and optical component...

AI Technical Summary

Problems solved by technology

It can be seen that using the Hartmann wavefront sensor to detect the laser beam has cumbersome operation steps; installing and adjusting the microlens array at the front end of the CCD detector will bring installation errors to the entire system, affecting the detection accuracy of the entire wavefront, and the microlens array will also restrict the detection. Dynamic range; the resolution of the Hartmann wavefront sensor is the array number of the front-end microlens array, so it is difficult to improve the wavefront detection resolution of the Hartmann wavefront sensor; also due to the existence of the microlens array, the detected The energy of the laser beam will also be reduced, thereby reducing the signal-to-noise ratio of the detected image; the CCD detector used in the Hartmann wavefront sensor should have a larger detection surface, and the microlens array is more expensive and It is difficult to install and adjust, and it must be equipped with beam expansion and beam reduction components, which lead to an increase in the cost of the Hartmann wavefront sensor

[0003] There are several methods for computing wavefronts and eigenvalues ​​based on the device, however, as a complete solution, its deficiencies from the device still exist

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