Circular ring Dammar grating

A Daman grating and annular technology, applied in the field of annular Daman grating, can solve problems such as annular intensity distribution that cannot provide multi-level spectrum and equal intensity

Inactive Publication Date: 2003-09-10
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, the previous super-resolution technology cannot provide the annular intensity distribution of multi-level spectrum and equal intensity.

Method used

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  • Circular ring Dammar grating
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  • Circular ring Dammar grating

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Embodiment Construction

[0020] figure 1 It is a schematic diagram of a Damman grating structure with three rings, one of the embodiments of the circular Damman grating of the present invention. The radius of each inner ring is represented by a, b, the phase of each ring is represented by φ1, φ2, and φ3, and the radius of the outer ring is Normalized to 1. It can be seen from the figure that the ring-type Damman grating of the present invention is a phase plate formed on a transparent medium with phase distribution of multiple concentric rings, and the phase values ​​in the same ring are the same. If the phase between all adjacent rings has only two values, it is called a binary phase ring type Damman grating. If the phase between the rings is multi-valued, it is called a multi-valued phase ring-type Damman grating.

[0021] Among the ring-type Damman gratings, the most commonly used and easy-to-process is the ring-type binary phase-only mask (binaryphase-only mask). The so-called ring zone means t...

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Abstract

The circular ring Dammer grating features phase board, which has several concentric annuluses formed on transparent medium and has the size similar to the aperture of diffraction limit lens, and the annulses, which have such the phase distribution that the phase in the same annulus is the same and the phases in adjacent annuluses are 0 and phi alternately. The present invention can correct the various orders of spectral light strength of far field diffraction spot of laser beam to obtain annular light strength distribution of specific orders. The present invention provides the phase board manufacturing parameters, which, after being optimized, can meet the requirement of far field diffraction spectrum peak strength difference in various orders within 10%.

Description

technical field [0001] The invention belongs to wave surface shaping of laser beams, in particular to a ring-shaped Damman grating, which realizes the equal-intensity ring-shaped light intensity distribution of each spectrum of the far-field diffraction spot of the laser beam. This kind of grating can be used in various instruments for beam shaping, laser display, laser beam coupling, intense laser energy concentration, wavefront flattening, and other changes in the spectrum of far-field diffraction spots. Background technique [0002] It is a practical subject to modify the geometric size and energy of the spectra of laser diffraction spots at various levels through various approaches. Many applications such as beam coupling and laser wavefront flattening require a circular or donut-shaped diffracted light intensity distribution. [0003] Phase modulation technology is a technology that achieves the expected diffraction light intensity distribution by changing the phase di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G02B27/44G03F7/00
Inventor 周常河贾佳刘立人
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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