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Beam shaping modulation sheet for quick focusing spot convergence and method thereof

A beam shaping and rapid convergence technology, applied in optics, optical components, instruments, etc., can solve the problems of unfocused light field, etc., and achieve the effect of reducing the intensity of side spots, optimizing the attenuation speed, and changing the convergence properties of light spots

Active Publication Date: 2017-06-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there is still no beam shaping method for the rapid convergence of the focused light field, so this patent designs a device and method that utilizes the amplitude modulation of the beam to achieve rapid convergence of the focused light spot

Method used

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  • Beam shaping modulation sheet for quick focusing spot convergence and method thereof
  • Beam shaping modulation sheet for quick focusing spot convergence and method thereof
  • Beam shaping modulation sheet for quick focusing spot convergence and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment is applied to an optical path formed by a single laser, an objective lens and a detector, and the modulation plate is placed between the laser and the objective lens.

[0060] This embodiment adopts one of the typical parameters, τ L =τ R =0.25, at this time, the amplitude modulation function is FAM.

[0061]

[0062] Amplitude modulation functions such as figure 1 As shown, will figure 1 Rotate along the x=0 axis to obtain the transmittance distribution of the amplitude modulation filter (i.e. the modulator of the present invention), the light intensity transmittance of the amplitude modulation filter is as follows figure 2 shown.

[0063] The comparison between the point spread function and the point spread function without amplitude modulation is as follows image 3 , where the dotted line is the case of amplitude modulation, and the solid line is the case of no amplitude modulation.

[0064] The attenuation speed of the focused spot after a...

Embodiment 2

[0067] This embodiment is applied to an amplitude modulation confocal microscope, and the amplitude modulation confocal microscope includes a common confocal microscope system and a modulation plate of the present invention. The amplitude modulation confocal microscope consists of an amplitude modulation plate and a common confocal microscope system. The amplitude modulation plate is placed in front of the focusing objective lens of the confocal microscope to modulate the amplitude of the excitation light incident on the sample.

[0068] Specific as Image 6 As shown, a common confocal microscope system includes a laser 1, a first aperture stop 2, a first objective lens 3, a beam splitter 4, a second objective lens 6, a sample 7, a focal plane 8, a scanning stage 9, and a third objective lens 10 , the second aperture stop 11 and the detector 12, the laser light emitted by the laser device 1 passes through the first aperture stop 2 and the first objective lens 3 successively an...

Embodiment 3

[0073] This embodiment is applied in an optical path composed of a laser, an objective lens and a detector, such as Figure 10 shown.

[0074] This embodiment adopts a random parameter, τ L =0.2,τ R =0.15, at this time, the amplitude modulation function is:

[0075]

[0076]

[0077] The corresponding amplitude modulation function is as Figure 11 As shown, will Figure 11 Rotate along the x=0 axis to obtain the transmittance distribution of the amplitude modulation filter (i.e. the modulator of the present invention), the light intensity transmittance of the amplitude modulation filter is as follows Figure 12 shown.

[0078] The point spread function of this parameter is as follows Figure 13 As shown, the resulting facula as Figure 14 As shown, it can be seen that the side spots of the light spot at this time are smaller than the case without amplitude modulation, and larger than the case of the typical parameters in Example 1, but the central spot is smaller ...

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Abstract

The invention discloses a beam shaping modulation sheet for quick focusing spot convergence and a method thereof. The beam shaping modulation sheet is an optical filter, the light intensity transmittance distribution is centrally symmetrical, the light intensity transmittance at each place in the radial direction is acquired by adopting an amplitude modulation function for calculation, the modulation sheet is placed in an optical path to filter and shape a beam to acquire a quick-convergence focusing spot. The amplitude modulation sheet is used to change the convergence feature of the focusing spot with little cost and little technical difficulty, the side spot intensity of a diffraction spot is reduced, and great application value and great potential are realized in various fields such as biological imaging and laser optics.

Description

technical field [0001] The invention relates to the field of laser beam shaping, in particular to a beam shaping modulator for fast convergence of focused light spots and a method thereof, which realizes fast convergence of focused light spots by using amplitude modulation of light beams. Background technique [0002] Since the first laser came out in 1960, lasers have gradually been used in many fields such as physics, chemistry, biology, materials, medicine, and information technology due to their excellent characteristics such as good monochromaticity, orientation, coherence, and high energy density. Wide range of applications. Since then, laser technology has continued to penetrate into other fields, which has greatly promoted the basic and applied research of other related disciplines, such as optoelectronic technology, biomedicine, material processing, precision measurement and many other fields, which play an important role. With the development of laser technology, ...

Claims

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Application Information

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IPC IPC(8): G02B27/09G02B21/00
CPCG02B21/0032G02B27/0927G02B27/0938G02B27/0988
Inventor 龚薇斯科段树民徐晓滨
Owner ZHEJIANG UNIV
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