Refracting-reflecting type variable zoom laser expanding and collimating system

Abstract

The invention discloses a refracting-reflecting type variable zoom laser expanding and collimating system. The laser expanding and collimating system comprises a refracting assembly and a reflecting assembly, wherein the refracting assembly consists of a first plano-convex spherical lens, a second refracting high-order aspheric plano-concave lens and a third plano-convex refracting high-order aspheric lens; the reflecting assembly consists of a fourth off-axis hyperboloid reflector and a fifth off-axis parabolic reflector; a monochrome Gaussian beam emitted by a laser passes through the first plano-convex spherical lens, the second refracting high-order aspheric photo-concave lens and the third plano-convex refracting high-order aspheric lens to finish primary collimating and expanding; parallel light subjected to expanding passes through the fourth off-axis hyperboloid reflector and the fifth off-axis parabolic reflector to finish secondary collimating and expanding. The refracting-reflecting type variable zoom laser expanding and collimating system can provide 6-30 fold continuous variable zoom expanding for a He-Ne laser with the wavelength being 0.6328 micrometer, has the advantages of simple structure, high expanding rate, no central obscuration and no solid convergent focal point, and can be applied to beam expanding of a high power laser.

Description

technical field [0001] The invention belongs to the field of optical design and relates to a laser beam expanding collimation system. Background technique [0002] Traditional laser beam expansion systems are generally divided into refractive laser beam expansion systems and reflective laser beam expansion systems. [0003] The refractive laser beam expander system mainly includes two forms: one is the Galilean telescope type composed of a positive lens and a negative lens, and the other is a Kepler telescope type composed of two positive lenses. The beam expansion magnification of these two anti-telescopic laser beam expansion systems is related to the apertures of the front and rear lenses. To obtain a large beam expansion magnification, the system must use a larger-diameter lens, and the large-diameter lens is often difficult to process. Therefore, it is difficult to increase the maximum zoom ratio of the general refractive laser beam expander system. [0004] Reflectiv...

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Problems solved by technology

The beam expansion magnification of these two anti-telescopic laser beam expansion systems is related to the apertures of the front and rear lenses. To obtain a large beam expansion magnification, the system must use a larger-diameter lens, and the large-diameter lens is often difficult to process. Therefore, it is difficult to increase the maximum zoom ratio of the general refractive laser beam expander system.

[0004] Reflective laser beam expander systems include Newtonian, Cassegrain, Gregorian and other types. Although these types of beam expanders can achieve large beam expansion magnifications, they all have central obstruction, and the energy concentration of general laser beams In the central area, the efficiency of this type of beam expander system is not high; and it is difficult to make a reflective system into a zoom form. If the beam emitted by the laser has different beam expansion magnification requirements, if a beam expander with a fixed magnification is used, it needs Configure multiple sets of beam expander system

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