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Method for obtaining time domain flat-top beam by once stimulated Brillouin scattering light limiting amplitude

A technology of stimulated Brillouin and flat-hat beams, which is applied in the field of nonlinear optics, can solve the problems of complex devices, large output energy loss, and the non-linear limiting mechanism cannot be applied to high-power laser system protection, etc., to achieve simple devices, Easy to control, effects with a wide range of wavelengths

Inactive Publication Date: 2008-12-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the non-linear limiting mechanism cannot be applied to the protection of high-power laser systems, and the existing methods for obtaining flat-top beams use complex devices, and the output energy loss of stimulated Brillouin scattered light is large. , so as to provide a method for obtaining a flat-top beam in the time domain by using one-time stimulated Brillouin scattering light clipping, which is a method based on the principle of stimulated Brillouin scattering to convert Gaussian light into a flat-top beam

Method used

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  • Method for obtaining time domain flat-top beam by once stimulated Brillouin scattering light limiting amplitude
  • Method for obtaining time domain flat-top beam by once stimulated Brillouin scattering light limiting amplitude
  • Method for obtaining time domain flat-top beam by once stimulated Brillouin scattering light limiting amplitude

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specific Embodiment approach 1

[0010] Specific implementation mode one: combine figure 1 This specific embodiment will be described. The primary stimulated Brillouin scattering system of this specific embodiment is composed of 1 / 2 wave plate 2, polarizer 3, 1 / 4 wave plate 4, lens 5 and oscillation pool 6, and realizes light limiting to obtain flat-top beam in time domain The method is as follows: the system inputs the s-polarized pump light to be transmitted through the 1 / 2 wave plate 2 to obtain the p-polarized pump light, and the p-polarized pump light is transmitted through the polarizer 3 and then enters the 1 / 4 wave plate 4. The circularly polarized pump light is obtained after the 1 / 4 wave plate 4 is transmitted, and the circularly polarized pump light is focused into the oscillation cell 6 through the lens 5, and generates excited Brillouin with the Brillouin medium in the oscillation cell 6. Scattering effect, the transmitted light generated by the scattering effect is the time-domain flat-top beam...

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the s-polarized pump light input by the system is short-wavelength pump light, and the wavelength range is from ultraviolet pump light to infrared pump light.

[0015] The relationship between the phonon lifetime of the Brillouin medium and the wavelength of the pump light is τ=λ 2 / 4π 2 η (where τ is the phonon lifetime of the Brillouin medium, λ is the wavelength of the pump light, and η is the kinematic viscosity of the Brillouin medium), it can be seen that the phonon lifetime of the Brillouin medium is proportional to the wavelength of the pump light Therefore, the shorter the wavelength of the pump light, the shorter the phonon lifetime of the Brillouin medium, the faster the phonon field is established, the more thoroughly the front energy of the pump light is transferred to the Stokes field, and the obtained Stimulated Brillouin scattered light clipping time domain pulse waveform is f...

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the kinematic viscosity of the Brillouin medium ranges from 3.0 cSt to 18.0 cSt. The preferred range of the kinematic viscosity of the Brillouin medium in this specific embodiment is between 4.0 cSt and 15.0 cSt.

[0019] The relationship between the phonon lifetime of the Brillouin medium and its kinematic viscosity is τ=λ 2 / 4π 2η (where τ is the phonon lifetime of the Brillouin medium, λ is the wavelength of the pump light, and η is the kinematic viscosity of the Brillouin medium), it can be seen that the phonon lifetime of the Brillouin medium is inversely proportional to its kinematic viscosity, so The greater the kinematic viscosity of the Brillouin medium, the shorter the phonon lifetime, the faster the phonon field is established, the more thorough the energy transfer from the front of the pump light to the Stokes field, and the obtained stimulated Brillouin scattered light The flatt...

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Abstract

The invention provides a method for obtaining time domain flat top beams by using one-time stimulated brillouin scattering light limiting, which relates to the field of nonlinear optics. The method solves the problems that the prior non-linear limiting mechanism can not be applied to protection of a high-power laser system, the device used in the prior method for obtaining flat top beams is complicated, and large output energy from the stimulated brillouin scattering light limiting is lost. The method provided by the invention is that s polarized pump light is input to the system; the light is transmitted to a lens (5) after passing through a 1 / 2 wave plate (2), a Polaroid (3), and a 1 / 4 wave plate (4); the light is focused on an oscillating pond (6), and shows the stimulated brillouin scattering effect with a brillouin medium in the oscillating pond (6); the transmitted light resulting from the scattering effect is the time domain flat top beam output from the system; and the phonon lifetime of the brillouin medium ranges from 0ns to 0.3ns. The method for obtaining time domain flat top beams by using one-time stimulated brillouin scattering light limiting has the advantages of simple devices used, wide application scope of wavelengths, high efficiency, etc.

Description

technical field [0001] The invention relates to the field of nonlinear optics, in particular to a method for obtaining flat-top light beams in time domain by using stimulated Brillouin scattering light limiting. Background technique [0002] Generally, the pulse waveform output by the laser is Gaussian, but some fields require a flat top pulse laser beam, such as in laser material processing (such as laser welding and laser drilling), laser nuclear fusion, laser clinical medicine (such as excimer laser therapy) Myopia), laser lithography, detection array lidar, laser scanning, optical information processing, storage and recording and other fields all require time-domain flat-top beams, so the research on time-domain flat-top beams has certain significance. At present, the research on flat-hat beams is mainly concentrated in the space domain, and there are relatively few researches in the time domain. T. Kanabe once used the pulse stacking method to obtain a time-domain flat-...

Claims

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Application Information

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IPC IPC(8): G02F1/35H01S3/10
Inventor 哈斯乌力吉吕志伟公胜林殿阳何伟明
Owner HARBIN INST OF TECH
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