Optical element achieving axial uniform linear focal spots

Abstract

The invention relates to an optical element achieving axial uniform linear focal spots. The optical element achieving the axial uniform linear focal spots is a lens or a reflector. At least one face of the lens or the reflector is a curved face. Incident rays which are distributed transversely at will are focused to the optical axis of the optical element through the lens or the reflector and show uniform linear focal spots. The curved face is an aspherical face. The axial uniform linear focal spots generated by the aspherical optical elements are not influenced by processing materials any more. The optical element achieving the axial uniform linear focal spots overcomes the defects that by the adoption of the 'filamentation' effect, the requirement for the processing materials is strict, the processing parameter 'window' is small, and the influence of material surfaces on the focal spots is large; and only one optical element is used for generation of the linear focal spots, processing of the element can be achieved through the prior art, and the complexity generated by a Bessel beam is overcome. The axial length of the linear focal spots is not limited theoretically, and the laser energy loss is the minimum. The optical element achieving the axial uniform linear focal spots overcomes the defects that the focal depth range of the Bessel beam is limited, and the peak power of the Bessel beam is low.

Description

technical field [0001] The invention relates to an optical device, in particular to a transmission or reflection device for changing the focusing characteristics of laser beams. Background technique [0002] The application fields of transparent or brittle materials such as glass, sapphire, and wafers are becoming more and more extensive. The most representative application fields are consumer electronics products, such as smart phone panels, camera protection windows, fingerprint recognition windows and other components. Transparent materials such as tempered glass and sapphire are used. Therefore, the effective and rapid processing of these materials has important practical significance. Traditional mechanical processing methods are slow, have severe edge chipping, and high consumables and costs, making it increasingly difficult to meet the increasing processing requirements of transparent or brittle materials. With the rapid development of laser technology, laser proces...

AI Technical Summary

Problems solved by technology

The disadvantage of the former is that it has strict requirements on the material to be processed, the "window" of processing parameters is small, and it is greatly affected by the surface of the material; the latter, that is, the Bessel beam can produce a long and narrow beam similar to a filament, and the power does not change within the focal depth range. Large, but its significant disadvantages are limited focal depth range, low peak power, single pulse may not be enough to destroy materials, and the optical system for forming Bessel beams is also relatively complicated

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