CN204807812U - Can produce optical system of single hollow light beam of local and hollow light beam of periodic local - Google Patents

Abstract

The utility model discloses a kind of optical system that can produce single bottle beams and periodical bottle beams,It include the laser set gradually along optical path,Telescope beam-expanding collimation device,Cylindrical lens and axicon,The radius of cylindrical lens is b, and the bottom surface radius of axicon is c,c amp; gt; B,The bottom surface of cylindrical lens is offered using this bottom surface as circular cone bottom surface and the indent conical cavity coaxial and contour with cylindrical lens,The bottom surface radius of this indent conical cavity is a,a amp; lt; B,The base angle r1 of this indent conical cavity is less than the base angle r2 of axicon,The bottom surface of this indent conical cavity towards the bottom surface of axicon,The distance between cylindrical lens and axicon are L, lt; maths num="0001" gt; ***NO_TRANS_Pr0000*** lt; /maths gt; Huo amp; lt; maths num="0002" gt; lt; /maths gt; The utility model can easily obtain single bottle beams and periodical bottle beams using a set of optical system, and structure is simple, and number of elements is few in system, and element processing is relatively easy, does not have particular/special requirement to Refractive Index of Material.

Description

The optical system of single bottle beams and periodicity bottle beams can be produced

Technical field

The utility model relates to a kind of optical system producing single bottle beams and periodicity bottle beams.

Background technology

Bottle beams (Bottlebeam) refer to a kind of have on the direction of propagation of light beam intensity be zero region, and outside this region three dimensions all round the special hollow beam of one of high-strength beam.Because it has the dummy section in the dark of three dimensional closure and high intensity gradient, can be used for the field such as particle capture, particle optical control, therefore the generation of hollow local light beam and applied research have become the very important problem of optical field one.

Bottle beams is divided into single bottle beams and periodicity bottle beams two kinds according to production.Two kinds of bottle beams differ from one another: single bottle beams can produce the dummy section in the dark of large-size, can be used for the manipulation of larger-sized particles; Periodically the size of dummy section in the dark of bottle beams is less, but once can produce multiple dummy section in the dark, can realize the multi-level manipulation of particulate.Therefore the application scenario of two kinds of bottle beams is also different.

What existing optical system can produce single bottle beams cannot produce periodically bottle beams, and can produce periodically bottle beams and cannot produce single bottle beams, and pole is unfavorable for the practical application of bottle beams.

In view of this, the present inventor conducts in-depth research for existing generation bottle beams optical system Problems existing, and this case produces thus.

Utility model content

The purpose of this utility model is to provide a kind of optical system producing single bottle beams and periodicity bottle beams.

To achieve these goals, the utility model adopts following technical scheme:

A kind of optical system producing single bottle beams and periodicity bottle beams, comprise the laser instrument, telescope beam-expanding collimation device, cylinder lenses and the axle pyramid that set gradually along light path, the radius of cylinder lenses is b, the bottom surface radius of axle pyramid is c, c>b, the bottom surface of cylinder lenses offers with this bottom surface for circular cone bottom surface and the indent conical cavity coaxial and contour with cylinder lenses, the bottom surface radius of this indent conical cavity is a, a<b, the base angle r of this indent conical cavity ₁be less than the base angle r of axle pyramid ₂, the bottom surface of this indent conical cavity is towards the bottom surface of axle pyramid, and the distance between cylinder lenses and axle pyramid is L, $0<L<\frac{b(r_2-r_1)}{r_2{\mathrm{tanr}}_1}$ Or $\frac{b(r_2-r_1)}{r_2{\mathrm{tanr}}_1}<L<\frac{c}{{\mathrm{tanr}}_1}.$

After adopting such scheme, a kind of optical system producing single bottle beams and periodicity bottle beams of the utility model, the laser beam that laser instrument produces forms almost plane ripple through telescope beam-expanding collimation device beam-expanding collimation, plane wave is divided into bottom two parts (center section and peripheral annular part) light beam onwards transmission to axle pyramid by the cylinder lenses of band indent conical cavity, peripheral annular part keeps bottom original optical property normal incidence axle pyramid, center section at the effect down conversion of indent conical cavity for having angle of divergence r ₁the incident axle pyramid of conical wave bottom, the distance L between adjustment cylinder lenses and axle pyramid, when time can obtain single bottle beams, when time, periodically bottle beams can be produced.The utility model adopts a set of optical system just can obtain single bottle beams and periodicity bottle beams easily, and structure is simple, and in system, number of elements is few, and element is processed relatively easily, do not had particular/special requirement to Refractive Index of Material.A kind of succinct, effective new way is provided for obtaining bottle beams.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model optical system;

Fig. 2 a is the side view of cylinder lenses in Fig. 1; Fig. 2 b is the stereographic map of cylinder lenses in Fig. 1;

Fig. 3 a is the side view of Fig. 1 axis pyramid; Fig. 3 b is the stereographic map of Fig. 1 axis pyramid;

Fig. 4 is the principle schematic that the utility model optical system produces single bottle beams;

Fig. 5 is the principle schematic that the utility model optical system produces periodically bottle beams.

Embodiment

A kind of optical system producing single bottle beams and periodicity bottle beams of the utility model, as shown in Figure 1, be included on optics guide rail along laser instrument 100, telescope beam-expanding collimation device 200, cylinder lenses 300 and axle pyramid 400 that light path sets gradually.

As shown in Fig. 2 a, 2b, 3a, 3b, the radius of cylinder lenses 300 is b, the bottom surface radius of axle pyramid is c, c>b, a bottom surface 31 of cylinder lenses 300 offers and is circular cone bottom surface and the indent conical cavity 32 coaxial and contour with cylinder lenses 300 with bottom surface 31, the bottom surface radius of this indent conical cavity 32 is a, a<b.Add man-hour, an indent conical cavity 32 coaxial and contour with cylinder lenses 300 can be gone out in the center grinding of the bottom surface 31 of cylinder lenses 300, the bottom surface 31 of cylinder lenses 300 is divided into two parts by indent conical cavity 32, that is, the radius corresponding to the bottom surface of indent conical cavity 32 is the center section of a and remaining peripheral annular part.And the base angle r of this indent conical cavity 300 ₁be less than the base angle r of axle pyramid 400 ₂.In optical system of the present utility model, the bottom surface of this indent conical cavity 32 is towards the bottom surface of axle pyramid 400.

The principle that the utility model produces single bottle beams and periodicity bottle beams is as follows:

The laser beam that laser instrument 100 produces forms almost plane ripple through telescope beam-expanding collimation device 200 beam-expanding collimation, plane wave is divided into bottom two parts light beam (representing respectively with solid line and dotted line in Fig. 4,5) onwards transmission to axle pyramid 400 by the cylinder lenses 300 of band indent conical cavity 32: the light beam that (1) injects peripheral annular part keeps bottom original optical property normal incidence axle pyramid 400, represented by dashed line in Fig. 4,5; (2) light beam injecting center section at the effect down conversion of indent conical cavity 32 for having angle of divergence r ₁the incident axle pyramid 400 of conical wave bottom, indicated by the solid line in Fig. 4,5.

The light beam (dotted line) injecting peripheral annular part acts on down conversion for having convergent angle r at axle pyramid 400 ₂conical wave, optical axis is formed bessel beam region ABCD; There is angle of divergence r ₁conical wave (solid line) at the effect down conversion of axle pyramid 400 for having convergent angle r ₂-r ₁new conical wave, optical axis is formed bessel beam region EFGH.

In Fig. 4,5, L is the distance between the cylinder lenses 300 of band indent conical cavity and axle pyramid 400.

(1) as shown in Figure 4, when time, the centre of two pieces of bessel beam region ABCD and EFGH there will be one piece of dummy section in the dark closed by peripheral light beam (representing by black shade in Fig. 4), i.e. single bottle beams.And increase the size that L can increase this block dummy section in the dark; Reduce the size that L can reduce this block dummy section in the dark.

(2) as shown in Figure 5, when time, two pieces of bessel beam region ABCD and EFGH can intersect, and namely two pieces of regions exist public part (representing by black shade in Fig. 5).Because the convergent angle difference of the conical wave forming two bundle bessel beams (is respectively r ₂and r ₂-r ₁), the longitudinal wave vector of two bundle bessel beams is not identical yet.Two harness have the bessel beam of different longitudinal wave vector to form periodically bottle beams in public part (in Fig. 5 black shaded area) coherence stack of two pieces of bessel beam region ABCD and EFGH.

Optical system of the present utility model, adopt a set of optical system just conveniently can obtain single bottle beams and periodicity bottle beams, and structure is simple, in system, number of elements is few, and element is processed relatively easily, do not had particular/special requirement to Refractive Index of Material.A kind of succinct, effective new way is provided for obtaining bottle beams.

Claims (1)

1. one kind can produce the optical system of single bottle beams and periodicity bottle beams, it is characterized in that: comprise the laser instrument, telescope beam-expanding collimation device, cylinder lenses and the axle pyramid that set gradually along light path, the radius of cylinder lenses is b, the bottom surface radius of axle pyramid is c, c>b, the bottom surface of cylinder lenses offers with this bottom surface for circular cone bottom surface and the indent conical cavity coaxial and contour with cylinder lenses, the bottom surface radius of this indent conical cavity is a, a<b, the base angle r of this indent conical cavity ₁be less than the base angle r of axle pyramid ₂, the bottom surface of this indent conical cavity is towards the bottom surface of axle pyramid, and the distance between cylinder lenses and axle pyramid is L, $0<L<\frac{b(r_2-r_1)}{r_2{\mathrm{tanr}}_1}$ Or $\frac{b(r_2-r_1)}{r_2{\mathrm{tanr}}_1}<L<\frac{c}{{\mathrm{tanr}}_1}.$