Laser beam expanding system

A technology of laser beam expansion and laser beam, which is applied in the direction of optics, optical components, instruments, etc.

Active Publication Date: 2010-06-30
HANS LASER TECH IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the design of this fixed-magnification beam expander is rela...

Method used

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  • Laser beam expanding system
  • Laser beam expanding system
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[0030] Φ 入 = 2mm β = 12X λ = 355nm

[0031] Among them, Φ 入 The maximum incident light diameter allowed by the beam expander system, that is: the maximum beam of the incident laser beam that the beam expander system can receive is directly 2mm; β is the beam expansion multiple, that is: the beam expander system expands the diameter of the incident laser beam After the beam is 12 times larger, it is still a beam of parallel light, which can solve the requirement of shaping the ultraviolet laser beam and expanding the diameter of the laser beam to improve the imaging quality; λ is the wavelength, that is, the incident light is an ultraviolet laser with a wavelength of 355nm.

[0032] Surface S

Curvature R(mm)

Surface spacing d(mm)

MaterialNd / Vd

1

4.5

1

1.46 / 68

2

2

89

3

0

2

1.46 / 68

4

-47.5

[0033] The range of parameters implemented by this patent is as follows...

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PUM

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Abstract

The invention relates to a location beam expanding system for ultraviolet laser, comprising a first lens and a second lens arranged in the light beam incidence direction; wherein the first lens is a crescent-shaped negative lens with back side thereof bent towards the incidence direction of light ray, the second lens is a plano-convex positive lens; the beam expanding system composed of the first lens and the second lens can expand diameter of incidence laser beam by 12 times and still eject the laser beam in the form of parallel light. As far as the beam expanding system of the invention is concerned, as the negative lens is short in focal length, thus not affecting aberration much; however, the positive lens is the main part which determines quality of outgoing beam from a beam expander. The beam expanding system enjoys a 12 times of beam expanding magnification, therefore a positive lens is enough to ensure quality of expanded outgoing beam; on the basis, not only shaping requirements are met, but also the best imaging quality is achieved; in addition, contour dimension is guaranteed to be the minimum, the imaging quality of the beam expanding system is very ideally balanced and volume of the whole lens is very small.

Description

【Technical field】 [0001] The invention relates to a fixed-magnification beam expander system applied to ultraviolet lasers. 【Background technique】 [0002] In the process of laser processing, the energy of the laser at the focal point is usually required to be very concentrated, so as to ensure the energy density of the focal point during laser processing, so that the laser can work effectively and improve the working efficiency of the laser. However, how to increase the focused energy density of the laser during work Woolen cloth? Generally by getting as small a focal point as possible. [0003] According to the diffraction limit theory: the divergence angle θ of the laser and the diameter of the light waist d 0 The relationship is Among them, for the use of a certain laser, the wavelength λ of the laser is certain, so the divergence angle θ of the laser is related to the diameter of the light waist d 0 The product of is a constant. The diameter of the laser beam outp...

Claims

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Application Information

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IPC IPC(8): G02B27/09
Inventor 高云峰李家英周朝明
Owner HANS LASER TECH IND GRP CO LTD
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