Long focal depth laser beam homogenizing optical system based on aspheric mirror difference effect

Abstract

The invention discloses a long focal depth laser beam homogenizing optical system based on aspheric mirror difference effect. The optical system comprises a beam homogenizing aspheric mirror group anda long focal depth spherical collimating mirror group, wherein the beam homogenizing aspheric mirror group comprises a negative power meniscus convex lens, a first positive power meniscus convex lens, an aspheric negative power meniscus concave lens, negative power double concave lens, and a second positive power meniscus convex lens; the long focal depth spherical collimating mirror group comprises a third positive power meniscus convex lens, a negative power concave lens, a positive power convex lens, and a negative power meniscus concave lens; and respective lenses are sequentially coaxially arranged in the light propagation direction. The optical system can convert Gaussian beams into uniformly distributed flat-topped Gaussian beams, which provides high-quality and efficient laser beams for intense laser damage measurement, laser cleaning, laser polishing, and laser combustion diagnostics, and facilitates further development in these areas.

Description

technical field [0001] The invention belongs to the field of laser applied optics, and relates to a uniform optical system for the spatial distribution of Gaussian beam energy of continuous laser and pulse laser. Background technique [0002] Intense laser-material interaction, laser cleaning, laser polishing, laser cladding, and laser combustion diagnosis are hot research areas in the development of laser application technology in recent years. When a strong laser interacts with a material, it will inevitably cause damage or damage to the surface and interior of the material. At present, the damage threshold (that is, the average laser power density or energy density that can cause damage to the surface of the material) is generally used in the world to quantitatively evaluate this. the extent of the destructive effect. However, the beam output by the laser is generally a Gaussian or Gaussian-like distribution of light spots, which has the characteristics of high middle he...

AI Technical Summary

Problems solved by technology

However, the output of existing lasers is not a beam with uniform energy distribution, and the output line spot after passing through the shaping system is also unevenly distributed. If this beam is used to measure the combustion field, the signal-to-noise ratio of the detected signal will be inconsistent ( Some areas have high signal-to-noise ratio, while others have low signal-to-noise ratio), which will greatly affect the final measurement accuracy

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