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Stimulated Brillouin scattering phase conjugate mirror with rotating wedge-shaped plate

A technology of stimulated Brillouin and phase conjugation, applied in nonlinear optics, instruments, optics, etc., can solve the problem of severe heat absorption of the medium, and achieve the effect of improving the heat absorption problem

Inactive Publication Date: 2010-06-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of severe heat absorption in the medium in the current traditional stimulated Brillouin scattering process, and provides a stimulated Brillouin scattering phase conjugate mirror with a rotating wedge plate

Method used

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  • Stimulated Brillouin scattering phase conjugate mirror with rotating wedge-shaped plate
  • Stimulated Brillouin scattering phase conjugate mirror with rotating wedge-shaped plate
  • Stimulated Brillouin scattering phase conjugate mirror with rotating wedge-shaped plate

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine figure 1 Describe this embodiment, the stimulated Brillouin scattering phase conjugate mirror with rotating wedge plate of this embodiment, it comprises SBS medium pool 1, focusing lens 2 and SBS medium 5, and described SBS medium 5 is contained in SBS medium In the pool 1, the SBS dielectric pool 1 is located on the image side optical path of the focusing lens 2, and it also includes a wedge plate 3, a rotating motor 4 and a connecting shaft 6, the wedge plate 3 is located on the object side optical path of the focusing lens 2, and the wedge plate 3 The center has a round hole, one end of the connecting shaft 6 is fixedly connected to the rotating shaft of the rotating motor 4, and the other end of the connecting shaft 6 passes through the round hole at the center of the wedge plate 3 and is fixedly connected with the wedge plate 3.

[0008] After the laser light is incident on the surface of the wedge plate 3, the transmitted ...

specific Embodiment approach 2

[0012] Specific embodiment two: different from embodiment one, the SBS medium pool 1 of the present embodiment is a cylindrical element, and the end face of the focusing lens 2 and the SBS medium pool 1 is placed close to each other, and the SBS medium 5 is full of the SBS medium pool 1, so that f represents the effective focal length of the focusing lens 2 in the SBS medium 5, θ L Represents the divergence angle of the incident laser light, R represents the vertical distance from the center of the focused spot of the laser light in the SBS medium 5 to the optical axis of the incident laser light, R 0 Indicates the cross-sectional radius of the SBS medium pool 1, and R satisfies the following relationship:

[0013] 2f×θ L ≤R≤R 0 .

[0014] When the wedge plate 3 and the focusing lens 2 are used together, the focus of the laser beam will be focused in the SBS medium 5 as the wedge plate 3 rotates after the laser is focused by the focusing lens 2 . The movement of the focal ...

specific Embodiment approach 3

[0016] Specific embodiment three: different from embodiment two, in this embodiment, the effective focal length f=50cm of focusing lens 2 in SBS medium 5, the divergence angle θ of incident laser light L =1mrad, at this time R satisfies:

[0017] 3mm≤R≤R 0 .

[0018] In this embodiment, R f =f×θ L =50cm×1mrad=0.5mm, R th = 2R f =1mm, so R should satisfy: 1mm≤R≤R 0 . However, when R=1mm, there can only be two pulse focal spots in one cycle of focus rotation, and the laser focus is very easy to overlap at this time, and the average area of ​​laser action does not increase significantly. Therefore, in this structure, R≥3mm is selected, and at this time, the focal spot of more than eight pulses can be accommodated in one cycle of focus rotation, so that the thermal effect of the laser can be dispersed to a larger area, effectively alleviating the impact of the thermal effect.

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Abstract

The invention discloses a stimulated Brillouin scattering phase conjugate mirror with a rotating wedge-shaped plate and relates to a phase conjugate mirror, solving the problem of serious heat absorption of media in the traditional stimulated Brillouin scattering process at present. The stimulated Brillouin scattering phase conjugate mirror with a rotating wedge-shaped plate comprises an SBS (Stimulated Brillouin Scattering) medium pool, a focusing lens and an SBS medium, wherein the SBS medium is loaded in the SBS medium pool; and the SBS medium pool is arranged on an image space light path of the focusing lens. The stimulated Brillouin scattering phase conjugate mirror also comprises a wedge-shaped plate, a rotating motor and a connecting shaft, wherein the wedge-shaped plate is arranged on an object space light path of the focusing lens; the center of the wedge-shaped plate is provided with a round hole; and one end of the connecting shaft is fixedly connected with a rotating shaft of the rotating motor, while the other end of the connecting shaft passes through the round hole in the center of the wedge-shaped plate and is fixedly connected with the wedge-shaped plate. The stimulated Brillouin scattering phase conjugate mirror overcomes the defects of the prior art and can be applied to the technical field of stimulated Brillouin scattering.

Description

technical field [0001] The invention relates to a phase conjugate mirror. Background technique [0002] With the increase of laser pulse energy and repetition rate, the problem of medium heat absorption, which is not considered in the traditional stimulated Brillouin scattering (SBS) process, can no longer be ignored. For laser pulses with high energy repetition rate, not only will there be a large heat absorption in the medium with high absorption rate, which will cause obvious problems such as the decrease of reflectivity, even for the medium with low absorption rate, the high energy repetition rate Laser pulses acting on the medium for a long time will also cause considerable heat absorption. The heat absorption not only loses the energy of the incident laser pulse, but also may cause a large temperature gradient, resulting in a change in the refractive index of the liquid medium, thereby affecting the energy reflectivity and stability of the SBS. When the repetition fr...

Claims

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Application Information

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IPC IPC(8): G02F1/35
Inventor 王雨雷吕志伟李勇
Owner HARBIN INST OF TECH
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