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Laser for generating high-power axisymmetric polarized light

An axisymmetric polarized light and laser technology, applied in the field of lasers, can solve the problem of axis-symmetrical polarized light that is not conducive to outputting high power and high degree of polarization. Efficient output of radially polarized light polarization degree and other issues, to achieve the effect of easy popularization, low loss and simple structure

Inactive Publication Date: 2011-08-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The disadvantage of this method is that many optical devices are used, and the system has strict requirements on the relative position between the wave plate and the optical axis of the birefringent element, and these devices are not suitable for high power
However, due to the insertion of the Brewster axicon mirror into the cavity, the loss of the resonator is increased
Moreover, the manufacturing and adjustment precision of the Brewster axicon mirror is very high, which limits the efficiency of the system and the degree of polarization of the output radially polarized light.
At the same time, the end-pumped structure also limits the power of the output laser
Therefore, this method is not conducive to the output of axisymmetric polarized light with high power and high polarization degree

Method used

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  • Laser for generating high-power axisymmetric polarized light
  • Laser for generating high-power axisymmetric polarized light
  • Laser for generating high-power axisymmetric polarized light

Examples

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example 1

[0044] Such as Figure 16 In the specific structure of the dielectric grating mirror shown, gallium arsenide is used in both the substrate and the grating region. φ 1 27.94 mm, φ 2 22.00 mm, φ 3 is 0.20 mm. The high refractive index material of the multilayer dielectric film is zinc selenide, the low refractive index material is thorium tetrafluoride, and the number of layers of the multilayer dielectric film is 5 layers. The period Λ of the grating is 6 microns, the ridge width b of the grating is 3 microns, and the reflectance curves of two kinds of polarized light are calculated by changing the depth h of the grating, such as Figure 17 shown. When the grating depth h is in the interval A near 1.50 microns (h is greater than 1.40 microns and less than 1.75 microns), the reflectivity of the normal incident P polarization component exceeds 99.0%, while the normal incident S polarization component reflectance is less than 53.54 %. Similarly, when the grating depth h is ...

example 2

[0046] Such as Figure 13 In the inner axicon metal grating mirror structure shown, both the base and the grating area are made of red copper. φ a 24.0 mm, φ b is 2.0 mm and b is 11.0 mm. The period Λ of the grating is 10 microns, the ridge width b of the grating is 5 microns, and the reflectance curves of two kinds of polarized light are calculated by changing the depth h of the grating, such as Figure 18 shown. When the grating depth h is in the interval C near 5.20 microns (h is greater than 5.1 microns and less than 5.3 microns), the reflectivity of the metal grating to the P polarization component incident at 45° exceeds 97.4%, so the inner axicon metal grating mirror is The reflectivity of the normal incident P polarization component exceeds 94.9%, while the reflectivity of the metal grating to the incident S polarization component at 45° is less than 65.0%, so the reflectivity of the inner axicon metal grating mirror to the normal incident S polarization component ...

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Abstract

The invention discloses a laser for generating high-power axisymmetric polarized light, which comprises a total-reflection mirror, an output mirror, a laser working medium and a pumping source, wherein the laser working medium is located on all folding arms perpendicular to the total-reflection mirror; the pumping source is a radio frequency semiconductor laser or a flash lamp pumping source. Thelaser is characterized by also comprising 4*N turning mirrors, N equals to 1, 2 and 3, and the centers of the 4*N turning mirrors are all located on the optical axis of a resonator, wherein the normal lines of 2*N turning mirrors are parallel to the meridian plane, and an included angle between the normal lines of two adjacent turning mirrors is 90 DEG; and the normal lines of the rest 2*N turning mirrors are parallel to the sagittal plane, an included angle between the normal lines of the rest two adjacent turning mirrors is also 90 DEG, and the included angles between the normal lines of the 4*N turning mirrors and the optical axis are 45 DEG. The total-reflection mirror is a medium grating mirror or an inner axial-cone metal grating mirror. The laser provided by the invention has the characteristics of simple structure, high output axisymmetric polarized light power, high degree of polarization, good beam quality and the like.

Description

technical field [0001] The invention belongs to lasers, and relates to a laser that outputs axisymmetric polarized light, in particular to a laser for generating high-power axisymmetric polarized light. Background technique [0002] Due to the special polarization characteristics of axisymmetric polarized light, it shows attractive application prospects in many fields. Among them, the most potential application is circularly polarized light ( Figure 1-a ) and radially polarized light ( Figure 1-b ) two types of axisymmetric polarized light, the arrows in Figure 1 point to the direction of the electric vector. The polarization directions of the circularly polarized light and the radially polarized light are respectively 90° and 0° to the radial direction in the beam cross section except the center of the beam. [0003] In laser processing, such as laser cutting, laser welding, laser drilling and other applications, the polarization state of the laser will have an importan...

Claims

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Application Information

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IPC IPC(8): H01S3/081H01S3/101
Inventor 王又青赵江李波杨扬贺昌玉
Owner HUAZHONG UNIV OF SCI & TECH
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