Angle Changing Device Based on Off-Axis Parabolic Mirror for Large Aperture Parallel Beam

Abstract

The invention discloses an angle changing device for large-aperture parallel beams based on an off-axis parabolic mirror, and belongs to the technical field of optics. The angle changing device comprises a laser device, an optical fiber coupler, a single-mode optical fiber, a precise linear displacement driver, a five-dimensional adjusting frame, the off-axis parabolic mirror and a control terminal. The input end of the single-mode optical fiber is fixed on the optical fiber coupler, and the output end of the single-mode optical fiber is arranged in the end plane of the precise linear displacement driver and level with the end plane. The precise linear displacement driver is fixed on the five-dimensional adjusting frame and connected with the control terminal. The control terminal can control the precise linear displacement driver to drive the output end of the single-mode optical fiber to linearly move in the focal plane of the off-axis parabolic mirror. The device has the characteristics of being large in emergent beam aperture, great in beam parallel quality, simple and compact in structure and convenient to adjust and can further realize angular deflection of the large-aperture parallel beams to be adaptive to wide range measurement so that the complexity and the difficulty of wide range measurement can be reduced.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to an angle changing device based on an off-axis parabolic mirror with a large-diameter parallel light beam. Background technique [0002] In optical applications, deflecting the collimated and expanded laser beam by a certain angle often occurs in the fields of optical interferometry and holography. Usually, the collimated and expanded laser beam consists of two sets of lenses and a spatial light filter. Limited by the existing lens processing technology and the influence of aberrations, the aperture of the lens is small and generally around tens of millimeters, which limits the The size of the beam aperture. Therefore, the area that can be measured each time is also small. For a large-area measured object, it often requires multiple measurements and then image stitching and other operations to obtain the final measurement result, which greatly increases the difficult...

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Problems solved by technology

Usually, the collimated and expanded laser beam consists of two sets of lenses and a spatial light filter. Limited by the existing lens processing technology and the influence of aberrations, the aperture of the lens is small and generally around tens of millimeters, which limits the The size of the beam aperture

Therefore, the area that can be measured each time is also small. For a large-area measured object, it often requires multiple measurements and then image stitching and other operations to obtain the final measurement result, which greatly increases the difficulty and complexity of the measurement system and data processing. degree; when deflecting the angle of a small-sized beam, a group of 4f lenses is usually added to the optical path, and the beam angle is deflected by a small movement of the lens, see Guo Xiaoming, Chen Chen, Wang Wensheng. Three-dimensional surface shape test based on digital holography[ J].Journal of Changchun University of Science and Technology: Natural Science Edition, 2015(1).; Or use the rotating table to control the mirror to deflect the angle, see Peng Z, Song Q, Li J.A sample test on the tilt angle of objectlight illumination in digital holographic 3D surface shape detection[J].ProcSPIE,2007:683212-683212-7; when the required beam aperture is large, the method of moving the lens itself limits the beam aperture, and the manufacturing and installation of large-area mirrors is extremely stable Resilience is also a problem, so neither beam deflection method is suitable

At present, in the measurement process, there are still great difficulties in changing the angle of the large-aperture parallel beam

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