Method for amplifying two-cell Brillouin scattering by controlling polarization state

A polarization state and polarization technology is applied in the field of double-cell Brillouin scattering amplification, which can solve the problems of affecting amplification efficiency and large gain, and achieve the effect of improving applicability, large gain effect, and improving detection performance.

Inactive Publication Date: 2010-11-17
NANCHANG HANGKONG UNIVERSITY
View PDF2 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the experiment, we found that the polarization state between the pump light and the seed light also

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for amplifying two-cell Brillouin scattering by controlling polarization state
  • Method for amplifying two-cell Brillouin scattering by controlling polarization state
  • Method for amplifying two-cell Brillouin scattering by controlling polarization state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] as attached figure 1 As shown, the device includes: a seed injection pulse laser (1), a half-wave plate (2), a polarization coupling mirror (3, 8, 16, 19), a 532nm total reflection mirror (4, 5, 6, 7, 13, 14), quarter-wave plate (9, 12, 15), convex lens (10), seed cell (11), electro-optic crystal (17), amplification cell (18), optical power meter (20, 21, 22).

[0014] The 532nm light output by the seed injection pulse laser (1) is vertically polarized light, the polarization coupling mirror (3) has a certain angle with the optical axis, and the horizontally polarized light after the half-wave plate (2) is polarized The mirror (3) is divided into two beams: the vertically polarized light is reflected by the polarization coupling mirror (8) through the 532nm total reflection mirror (4, 5, 6, 7), passes through the quarter wave (9), and the convex lens (10) Focusing in the seed pool (11), stimulated Brillouin scattered light (SBS) is generated near the focus. Since the...

Embodiment 2

[0017] as attached image 3 As shown, the device includes: a seed injection pulse laser (1), a half-wave plate (2), a polarization coupling mirror (3, 8, 12, 16), a 532nm total reflection mirror (4, 5, 6, 7, 13, 14), quarter-wave plate (9), convex lens (10), seed pool (11), amplification pool (15), optical power meter (17).

[0018] The seed-injected pulsed laser (1) outputs 532nm vertically polarized light, which becomes horizontally polarized light after passing through a half-wave plate and reaches the polarization coupling mirror (3), where it is divided into two beams: the vertically polarized part passes through a 532nm total reflection mirror (4, 5, 6, 7) are reflected by the polarizing coupling mirror (8), focused on the seed pool (11) through a quarter-wave plate (9) and a convex lens (10), and stimulated Bury Scattered light (SBS) becomes horizontal light due to passing through the quarter-wave plate (9) twice and enters the amplification cell (15) through the polar...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for amplifying two-cell Brillouin scattering by controlling a polarization state. In order to do research on the influence of the polarization state of pumping light and seed light on an SBS (stimulated Brillouin scattering) gain in a two-cell Brillouin amplification system, the invention provides the method for amplifying the two-cell Brillouin scattering by controlling the polarization state. The method is characterized in that: a light path of the pumping light is provided with a polarization state control device on the basis of the conventional Brillouin amplification technology; the polarization state of the pumping light is precisely changed by the polarization state control device; when the polarization state of SBS seed light remains unchanged, a polarization included angle between two beams of light can be controlled by changing the polarization state of the pumping light; one light power meter receives the SBS seed light (which is not amplified by amplified light) before an amplification cell, while the other light power meter receives amplified SBS signal light; and an SBS gain coefficient is obtained by comparing and calculating the readings of both the power meters.

Description

technical field [0001] The invention relates to a double-cell Brillouin scattering amplification method for controlling the polarization state. Background technique [0002] Brillouin scattering and Raman scattering are increasingly used in underwater detection, especially stimulated Brillouin scattering. However, most of the current SBS detection techniques use single-cell focused SBS. The high-energy laser is directly focused on a point in the water, and the SBS light at the focus is in the echo process In the long-distance water attenuation is already very weak when it reaches the detector, which limits its detection depth; at the same time, the energy density at the focus is too high to produce other nonlinear processes that limit its detection resolution. So someone proposed the double-cell Brillouin scattering amplification technology, but the most research on this technology is the energy ratio between the pump light and the seed light, and the influence of the inclu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02F1/39G02F1/03
Inventor 何兴道张婷婷刘伟赵晚昭刘娟史久林
Owner NANCHANG HANGKONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap