CN105242476A - Stimulated Brillouin scattering container with grooves and method - Google Patents

Abstract

Provided is a stimulated Brillouin scattering container with grooves. At least two grooves are formed in the container in the length direction, and the grooves are symmetric in the axial direction of the length direction. When it is required that the included angle between two light beams incident to the stimulated Brillouin scattering container is delta, the intersection points of the incident plane of the two light beams on the container and the surface of the container are a and b respectively, and the length between a and b is L1, the length of the portion, in front of the first groove, of the container is L2 and should meet the formula in the specification, H is the height or diameter of the first groove, and h is the height or diameter of the second groove. According to the container structure, enhanced stimulated Brillouin scattering signals can be generated.

Description

A kind of reeded stimulated Brillouin scattering container of tool and method

Technical field

The present invention relates to a kind of stimulated Brillouin scattering container and utilize this container to carry out the method for scattering, belonging to optical technical field.

Background technology

The stimulated Brillouin scattering device of prior art is generally divided into two kinds, one is flashlight and pump light same light path, another is that flashlight and pump light exist intersecting angle, wherein cut both ways, the two-beam participating in stimulated scattering is incorporated on identical path by the needs of same light path, and generally take two kinds of modes, one utilizes semi-transparent semi-reflecting lens, another uses polarizing beam splitter mirror, but the outstanding problem which kind of situation is brought is all lose more luminous energy.For the situation that there is intersecting angle, then semi-transparent semi-reflecting lens need not be used, do not need to use polarizing beam splitter mirror yet, the loss of luminous energy can not be brought, but its shortcoming is also obvious, that travel path due to two-beam is not overlapping, just intersect on stretch footpath or even on a point, so cause the used apart from short of them, although the energy participating in the two-beam of stimulated scattering is all stronger, but because operating distance is short especially, so the stimulated Brillouin scattering signal produced is usually all more weak.In order to extend operating distance, the way that can expect is exactly the angle reduced between two-beam or the number of times increasing intersection.Increase the number of times intersected and can increase reflecting surface in long container, again intersect after reflection.Conventional stimulated Brillouin scattering container as shown in Figure 1, it is cylindrical or rectangular parallelepiped, for this container, if want to realize larger stimulated Brillouin scattering signal, then need the angle reduced between two-beam, increase the number of times of intersection simultaneously, but, in order to realize above-mentioned 2 points, need the length constantly extending container, because no matter be reduce intersecting angle, or increase the number of times intersected and all need longer distance, this just needs the container more grown to provide this distance, the defect that the length extending container is brought also is obvious, although distance extends a lot of exactly, but the action length of the two-beam of reality increases limited, such as the increase of 50cm container length may just bring increase once crossing, like this, in fact the distance that stimulated Brillouin scattering light is propagated at internal tank also can increase, stimulated scattering light is propagated in this medium can face decay equally, the propagation distance that the enhancing that result increases once the stimulated Brillouin scattering that increase that is crossing or that reduce the stimulated Brillouin scattering operating distance that intersecting angle brings produces often is increased has attenuated, what sometimes even attenuate is more, the stimulated Brillouin scattering of enhancing is not only there is no after this has been doning, obtain stimulated Brillouin scattering signal little all the better, lose more than gain.

Summary of the invention

The present invention puts forward for the problems referred to above, provide a kind of stimulated Brillouin scattering container and utilize this container to carry out the method for stimulated Brillouin scattering, use stimulated Brillouin scattering container of the present invention, by the length of balanced, crossover number of times or intersecting angle and container, the problem that stimulated Brillouin scattering light can not be enhanced by force can be solved, thus the stimulated Brillouin scattering light significantly strengthened can be obtained.

For solving the problem, according to one embodiment of the invention, provide a kind of stimulated Brillouin scattering container, it is characterized in that: this container at least has two grooves in the longitudinal direction, its further groove is axially axisymmetric at length direction, when requiring that the angle incided between the two-beam on stimulated Brillouin scattering container is δ, the intersection point of two-beam between the plane of incidence place and vessel surface of container is respectively a and b, length between a and b is L1, and the length L2 before first groove of so container should meet wherein H is height or the diameter of first groove, and h is height or the diameter of second groove, uses this structure of container can produce the stimulated Brillouin scattering signal of enhancing.

According to one embodiment of the invention, the cross section of described container is rectangle or circle.

According to one embodiment of the invention, $L2=\frac{L1}{2tg\frac{\mathrm{\δ}}{2}}+\frac{H}{2tg\frac{\mathrm{\δ}}{2}}+\frac{H-h}{2tg\frac{\mathrm{\δ}}{2}}.$

According to one embodiment of the invention, the whole length L3 of stimulated Brillouin scattering container satisfies condition $L3\≥$ $\frac{L1}{2tg\frac{\mathrm{\δ}}{2}}+\frac{H}{tg\frac{\mathrm{\δ}}{2}}.$

According to one embodiment of the invention, provide one and utilize stimulated Brillouin scattering container to carry out being excited in cloth

The method of deep pool scattering, is characterized in that, with intersecting angle δ at the incident two bundle pump lights of the incidence end of container.

Accompanying drawing explanation

Accompanying drawing 1 is stimulated Brillouin scattering container schematic diagram of the prior art;

Accompanying drawing 2 be in the present invention use the schematic diagram of stimulated Brillouin scattering container.

Embodiment

Stimulated Brillouin scattering container of the present invention will be described in detail below on basis by reference to the accompanying drawings.Figure 2 illustrate stimulated Brillouin scattering container of the present invention, this container at least has two grooves in the longitudinal direction, and axially symmetrical at length direction of groove, in the embodiment that Fig. 2 provides, the quantity of groove is 2.The cross section of container can be known shape, such as rectangle, circular etc.

The relational expression that wherein said stimulated Brillouin scattering container demand fulfillment is following: when requiring that the angle incided between the two-beam on stimulated Brillouin scattering container is δ, the intersection point of two-beam between the plane of incidence place and vessel surface of container is respectively a and b, length between a and b is L1, and so the length sum L2 (being also the length before second groove) of container first paragraph and second segment should meet wherein H is height or the diameter of first groove, h is height or the diameter of second groove, δ is the intersecting angle between two bundle pump lights of participation stimulated Brillouin scattering, by the length before first groove arranging container like this, can ensure to use this structure of container can produce the stimulated Brillouin scattering signal significantly strengthened, because (now not considering the existence of the 3rd section) can be intersected again what ensure that the little situation of intersecting angle realize stimulated Brillouin scattering two light beams in short distance like this, simultaneously again can not the travel path of broken beam.

Wherein preferred mode is arranged can ensure like this to realize optimized design under minimum length, also namely can obtain maximum stimulated Brillouin scattering signal with the shortest length.Wherein this length L2 can not be less than if because be less than this length, the vertical chamber wall of groove can impact the propagation of light path, first its impact produced can decay the light intensity of pump light, simultaneously because flashlight and pump light are that same light path is propagated, so intensity and the propagation of stimulated Brillouin scattering flashlight and then must be had influence on.

Further, should satisfy condition for the length L3 that stimulated Brillouin scattering container is whole so just can ensure that two bundle pump lights realize third time in the 3rd section crossing, thus the intensity of stimulated Brillouin scattering flashlight can be maximized.

Be more than illustrating for this invention, but can not limitation of the present invention be interpreted as.The distortion of those skilled in the art's precognition is all in protection scope of the present invention.

Claims (5)

1. a stimulated Brillouin scattering container, it is characterized in that: this container at least has two grooves in the longitudinal direction, its further groove is axially axisymmetric at length direction, when requiring that the angle incided between the two-beam on stimulated Brillouin scattering container is δ, the intersection point of two-beam between the plane of incidence place and vessel surface of container is respectively a and b, length between a and b is L1, and the length L2 before first groove of so container should meet wherein H is height or the diameter of first groove, and h is height or the diameter of second groove, uses this structure of container can produce the stimulated Brillouin scattering signal of enhancing.

2. stimulated Brillouin scattering container as claimed in claim 1, is characterized in that: the cross section of described container is rectangle or circle.

3. stimulated Brillouin scattering container as claimed in claim 1, is characterized in that: $L2=\frac{L1}{2tg\frac{\mathrm{\δ}}{2}}+\frac{H}{2tg\frac{\mathrm{\δ}}{2}}+$ $\frac{H-h}{2tg\frac{\mathrm{\δ}}{2}}.$

4. stimulated Brillouin scattering container as claimed in claim 1, is characterized in that: the whole length L3 of stimulated Brillouin scattering container satisfies condition

5. utilize arbitrary stimulated Brillouin scattering container in claim 1-4 to carry out a method for stimulated Brillouin scattering, it is characterized in that, with intersecting angle δ at the incident two bundle pump lights of the incidence end of container.