High-power laser wave front measuring instrument and wave front measuring method

Abstract

The invention discloses a high-power laser wave front measuring instrument and a wave front measuring method, and solves the problems of single-beam laser wave front analysis and phase difference measurement of two arbitrary beams of laser in multi-beam high-power laser coherent combination. The measuring instrument comprises a mechanical shutter, a light beam sampling reflecting mirror, a laser compressing optical system, a transmission-type attenuator, a reflection-type attenuator, a Hartmann wave front analyzer, a phase difference detecting charge coupled device (CCD) camera, and a computer. When the measuring instrument works, the mechanical shutter is opened only during the wave front measurement. The measuring method includes the steps of using the Hartmann wave front analyzer for measuring the wave front of each single-beam laser and simultaneously using the phase difference detecting CCD camera for recording the light distribution of each single-beam laser; taking one single-beam laser as a reference, opening other beams of laser in sequence to interfere with the referential laser respectively; using the phase difference detecting CCD camera for measuring the light intensity of each two beams of laser after the coherent combining so as to obtain phase differences of each beam of laser relative to the referential laser; and using the Hartmann wave front analyzer for measuring the wave front of the laser after the coherent combination.

Description

technical field

[0001] The invention belongs to the field of laser technology measurement, and specifically relates to a measurement system for single-path laser wavefront analysis and phase difference measurement of any two-path laser in coherent combination of multi-path high-power lasers. Laser wavefront measurements at the watt level. Background technique

[0002] Improving laser wavefront performance is an important means to improve laser beam quality. Therefore, laser wavefront characteristics are not only a technical index of laser performance, but also an evaluation index of beam quality.

[0003] For high-power laser devices, the wavefront distortion and atmospheric turbulence effects of the outgoing laser will affect the near-field beam quality, focusing characteristics and laser transmission capabilities. Therefore, suppressing and compensating the mid-to-high frequency phase distortion becomes the key to ensuring the quality of the laser beam, and the laser wave...

Examples

Embodiment Construction

[0028] The measurement principle, system structure and specific working process of the present invention will be described in detail and completely below in conjunction with the accompanying drawings.

[0029] 1, system structure of the present invention and concrete work process are as follows:

[0030] refer to figure 1 , the measuring instrument of the present invention comprises: mechanical shutter 1, beam sampling mirror 2, beam reduction optical system 3, transmission attenuator 4, reflection attenuator 6, Hartmann wavefront analyzer 5, phase difference detection CCD camera 7 and computer 8. The mechanical shutter 1 is only opened during the wavefront measurement, so that the measuring instrument works in a pulse mode, so as to avoid thermal deformation of the optical components of the measurement system caused by high-power laser and affect the measurement accuracy. The beam sampling mirror 2 attenuates the high-power laser for the first time, and reflects the laser b...

technical field

[0001] The invention belongs to the field of laser technology measurement, and specifically relates to a measurement system for single-path laser wavefront analysis and phase difference measurement of any two-path laser in coherent combination of multi-path high-power lasers. Laser wavefront measurements at the watt level. Background technique

[0002] Improving laser wavefront performance is an important means to improve laser beam quality. Therefore, laser wavefront characteristics are not only a technical index of laser performance, but also an evaluation index of beam quality.

[0003] For high-power laser devices, the wavefront distortion and atmospheric turbulence effects of the outgoing laser will affect the near-field beam quality, focusing characteristics and laser transmission capabilities. Therefore, suppressing and compensating the mid-to-high frequency phase distortion becomes the key to ensuring the quality of the laser beam, and the laser wave...

Examples

Embodiment Construction

[0028] The measurement principle, system structure and specific working process of the present invention will be described in detail and completely below in conjunction with the accompanying drawings.

[0029] 1, system structure of the present invention and concrete work process are as follows:

[0030] refer to figure 1 , the measuring instrument of the present invention comprises: mechanical shutter 1, beam sampling mirror 2, beam reduction optical system 3, transmission attenuator 4, reflection attenuator 6, Hartmann wavefront analyzer 5, phase difference detection CCD camera 7 and computer 8. The mechanical shutter 1 is only opened during the wavefront measurement, so that the measuring instrument works in a pulse mode, so as to avoid thermal deformation of the optical components of the measurement system caused by high-power laser and affect the measurement accuracy. The beam sampling mirror 2 attenuates the high-power laser for the first time, and reflects the laser b...

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