CN105467582B - A kind of Beam switching device and switching method - Google Patents

Abstract

The invention discloses a kind of Beam switching device and switching method, which includes the photoelectric device for being internally provided with the box body of cavity and being arranged in cavity, and photoelectric device includes：First laser device, second laser, DMD micro mirrors device, the first polarization splitting prism, the second polarization splitting prism, the first half-wave plate and the second half-wave plate.A kind of Beam switching device of the present invention and switching method, the switching of light beam are realized using DMD micro mirrors device, its is simple in structure, cost is low and switching efficiency is high.

Description

Light beam switching device and switching method

technical field

The invention belongs to the field of optoelectronic technology, and in particular relates to a light beam switching device and a switching method.

Background technique

Two-photon fluorescence microscopy imaging technology uses near-infrared femtosecond laser as a light source, which can perform biomicroscopic imaging of thicker biological tissues. It has the characteristics of large imaging depth, small optical damage, high spatial resolution and contrast. The photostimulation experiment of another wavelength laser can be used to study the movement characteristics and molecular dynamics of proteins in living cells.

However, the structure of the beam switching device in the existing fluorescence microscope is complicated, and the switching efficiency is low. Therefore, a light beam switching device and switching method with simple structure, convenient operation and high switching efficiency need to be proposed urgently.

Contents of the invention

In order to solve the above technical problems, the present invention proposes a beam switching device and a switching method, which uses a DMD micromirror to switch the beam, and has a simple structure, low cost and high switching efficiency.

In order to achieve the above object, technical scheme of the present invention is as follows:

A light beam switching device, comprising a box with a cavity inside and a photoelectric device arranged in the cavity, the photoelectric device includes: a first laser, used to emit a first laser beam; a second laser, used to emit a second laser beam Laser beam; DMD micromirror device, used for reflecting and refracting the first laser beam and the second laser beam; the first polarization beam splitter prism, arranged on one side of the DMD micromirror device, used for the first laser beam and/or Or the second laser beam realizes refraction and transmission; the second polarizing beam splitting prism is arranged on one side of the first polarizing beam splitting prism, and the first polarizing beam splitting prism is arranged between the DMD micromirror device and the second polarizing beam splitting prism, and the second polarizing beam splitting prism The polarization beam splitter is used to refract and transmit the first laser beam and/or the second laser beam; the first half-wave plate is arranged between the first polarization beam splitter and the DMD micromirror, and is used to adjust the first laser beam The polarization angle; the second half-wave plate, arranged between the first polarization beam splitter and the second polarization beam splitter, is used to adjust the polarization angle of the second laser beam.

The light beam switching device of the present invention has a simple structure, uses a DMD micromirror to switch between the first laser beam and the second laser beam, and has high switching efficiency.

On the basis of the above-mentioned technical scheme, the following improvements can also be made:

As a preferred solution, the beam switching device further includes: a third half-wave plate, the third half-wave plate is arranged between the first laser and the first polarization beam splitter, and is used to adjust the polarization of the first laser beam emitted by the first laser angle, so that the first laser beam passing through the third half-wave plate can be completely refracted by the first polarization beam splitter prism.

By adopting the above preferred solution, it is ensured that the first laser beam passing through the third half-wave plate can be completely refracted by the first polarization beam splitter prism.

As a preferred solution, the beam switching device further includes: a fourth half-wave plate, the fourth half-wave plate is arranged between the second laser and the second polarization beam splitter, and is used to adjust the polarization of the second laser beam emitted by the second laser angle, so that the second laser beam passing through the fourth half-wave plate can be completely refracted by the second polarization beam splitter prism.

By adopting the above-mentioned preferred scheme, it is ensured that the second laser beam passing through the fourth half-wave plate can be completely refracted by the second polarization beam splitter prism

As a preferred solution, the light beam switching device also includes a dichroic mirror, and the dichroic mirror is used to perform the first laser beam reflected and refracted by the DMD micromirror with the second laser beam reflected and refracted by the DMD micromirror. Beam coupling.

With the above preferred solution, the structure is simple, and the combination and coupling effect of the first laser beam and the second laser beam is good.

As a preferred solution, a light-shielding sheet is provided in the box body, and the light-shielding sheet divides the cavity into a switching cavity and a coupling cavity, and a first through-hole and a second through-hole are arranged on the light-shielding sheet, and the first through-hole is used for the first through-hole. A laser beam shoots from the switching cavity to the coupling cavity, and the second through hole is used for the second laser beam to shoot from the switching cavity to the coupling cavity.

Using the above preferred solution, the shading sheet can effectively isolate the stray light generated during the switching process in the switching cavity, prevent it from entering the coupling cavity, and ensure that the light beam in the coupling cavity

As a preferred solution, the first laser, the second laser, the DMD micromirror, the first polarizing beam splitter, the second polarizing beam splitting prism, the first half-wave plate, the second half-wave plate, the third half-wave plate and the fourth The half-wave plate is arranged in the switching cavity.

With the above preferred solution, the switching cavity is used to switch the light beam.

As a preferred solution, the dichroic mirror is arranged in the coupling cavity.

Using the above preferred solution, the coupling cavity is used to realize the coupling and emission of light beams.

A beam switching method, using a beam switching device to switch beams, comprising the following steps:

S1 The first laser emits the first laser beam, and the second laser emits the first laser beam;

S2 The first laser beam and the second laser beam are refracted through the first polarization beam splitter and the second polarization beam splitter respectively;

S3 the first laser beam refracted by the first polarization beam splitter prism passes through the first half-wave plate and shoots to the reflection part of the DMD micromirror device;

S4 judges whether the reflection portion of the DMD micromirror device is a reflection state,

If it is in the reflective state, after the original path reflection of the first laser beam, enter S5,

If it is not in a reflective state, then the first laser beam is not reflected;

S5 The polarization angle of the first laser beam reflected by the DMD micromirror is adjusted through the first half-wave plate, so that the first laser beam is sequentially transmitted from the first polarization beam splitter and the second polarization beam splitter, and passes through the first penetration hole into the coupling cavity;

S6 the second laser beam refracted by the second polarization beam splitter prism is adjusted through the second half-wave plate to adjust the polarization angle, so that the second laser beam is transmitted from the second polarization beam splitter prism, and hits the refraction part of the DMD micromirror device;

S7 judges whether the refraction portion of the DMD micromirror device is a refraction state,

If it is in the refraction state, refract the second laser beam so that the second laser beam enters the coupling cavity through the second through hole,

If not in the refracted state, the second laser beam is not refracted.

The beam switching method of the invention has good switching effect and high switching efficiency.

As a preferred solution, step S1 also includes the following specific steps:

S1.1 The first laser emits the first laser beam, and the polarization angle of the first laser beam is adjusted through the third half-wave plate;

S1.2 The second laser emits a second laser beam, and the polarization angle of the second laser beam is adjusted by the fourth half-wave plate.

Using the above-mentioned preferred scheme, ensure that the first laser beam passing through the third half-wave plate can be completely refracted by the first polarization beam splitter, and ensure that the second laser beam passing through the fourth half-wave plate can be completely refracted by the second polarization beam splitter prism refraction.

As a preferred solution, the beam switching method also includes:

S8 The first laser beam and/or the second laser beam entering the coupling cavity enters the optical fiber after passing through the dichroic mirror.

By adopting the above preferred solution, it is ensured that the light beam can be effectively coupled or emitted.

Description of drawings

FIG. 1 is a schematic structural diagram of a beam switching device provided by an embodiment of the present invention.

Among them: 1 first laser, 2 second laser, 3 DMD micromirror, 31 reflection part, 32 refraction part, 4 first polarizing beam splitting prism, 5 second polarizing beam splitting prism, 6 first half wave plate, 7 second Half-wave plate, 8 third half-wave plate, 9 fourth half-wave plate, 10 dichroic mirror, 11 shading plate, 12 switching cavity, 13 coupling cavity, 14 first perforation hole, 15 second perforation hole, 16 mirrors, 17 coupling objective lenses.

Detailed ways

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

In order to achieve the object of the present invention, in some embodiments of a light beam switching device and switching method,

As shown in Figure 1, a light beam switching device includes a box body 1 with a cavity inside and an optoelectronic device arranged in the cavity. The optoelectronic device includes:

The first laser 1 is used to emit a first laser beam;

The second laser 2 is used to emit a second laser beam;

DMD micromirror device 3, used for realizing reflection and refraction to the first laser beam and the second laser beam;

The first polarization beam splitter prism 4 is arranged on one side of the DMD micromirror device 3, and is used to realize refraction and transmission to the first laser beam and/or the second laser beam;

The second polarizing beam-splitting prism 5 is arranged on one side of the first polarizing beam-splitting prism 4, and the first polarizing beam-splitting prism 4 is arranged between the DMD micromirror device 3 and the second polarizing beam-splitting prism 5, and the second polarizing beam-splitting prism 5 is used for realizing refraction and transmission of the first laser beam and/or the second laser beam;

The first half-wave plate 6 is arranged between the first polarization beam splitter prism 5 and the DMD micromirror device 3, and is used to adjust the polarization angle of the first laser beam;

The second half-wave plate 7 is arranged between the first polarization beam splitter prism 4 and the second polarization beam splitter prism 5 for adjusting the polarization angle of the second laser beam.

The third half-wave plate 8, the third half-wave plate 8 is arranged between the first laser 1 and the first polarization beam splitter prism 4, and is used to adjust the polarization angle of the first laser beam emitted by the first laser 1, so that after passing through the third The first laser beam of the half-wave plate 8 can be completely refracted by the first polarization beam splitter prism 4;

The fourth half-wave plate 9, the fourth half-wave plate 9 is arranged between the second laser 2 and the second polarization beam splitter prism 5, and is used to adjust the polarization angle of the second laser beam emitted by the second laser 2, so that after passing through the fourth The second laser beam of the half-wave plate 9 can be completely refracted by the second polarization beam splitter prism 5;

The dichroic mirror 10 is used for combining and coupling the first laser beam reflected by the DMD micromirror 3 and the second laser beam refracted by the DMD micromirror 3 .

The box body 1 is provided with a shading sheet 11, the shading sheet 11 divides the cavity into a switching cavity 12 and a coupling cavity 13, the first laser 1, the second laser 2, the DMD micromirror 3, the first polarization beam splitter prism 4, the second The two polarization splitter prism 5, the first half-wave plate 6, the second half-wave plate 7, the third half-wave plate 8 and the fourth half-wave plate 9 are arranged in the switching cavity 12, and the dichroic mirror 10 is arranged in the coupling cavity 13 Inside.

The light shielding sheet 11 is provided with a first perforation hole 14 and a second perforation hole 15, the first perforation hole 14 is used for the first laser beam to shoot from the switching cavity 12 to the coupling cavity 13, and the second perforation hole 15 is used for The second laser beam is emitted from the switching cavity 12 to the coupling cavity 13 .

Several reflection mirrors 16 are also arranged in the box body 1 .

A beam switching method, using a beam switching device to switch beams, comprising the following steps:

S1 The first laser 1 emits the first laser beam, and the second laser 2 emits the first laser beam;

S2 The first laser beam and the second laser beam are refracted through the first polarization beam splitter prism 4 and the second polarization beam splitter prism 5 respectively;

The first laser beam refracted by S3 through the first polarization beam splitter prism 4 shoots to the reflector 31 of the DMD micromirror device 3 through the first half-wave plate 6;

S4 judges whether the reflector 31 of DMD micromirror device 3 is reflective state,

If it is in the reflective state, after the original path reflection of the first laser beam, enter S5,

If it is not in a reflective state, then the first laser beam is not reflected;

S5 through the first laser beam reflected by the DMD micromirror device 3, the polarization angle is adjusted by the first half-wave plate 6, so that the first laser beam is transmitted from the first polarization beam splitter prism 4 and the second polarization beam splitter prism 5 successively, and passes through the first polarization beam splitter prism 5. A perforation hole 14 enters the coupling cavity 13;

S6 carries out polarization angle adjustment through the second half-wave plate 7 through the second laser beam refracted by the second polarization beam splitter prism 5, so that the second laser beam is transmitted from the second polarization beam splitter prism 5, and shoots to the DMD micromirror device 3 refraction part 32;

S7 judges whether the refraction portion 32 of the DMD micromirror device 3 is in a refraction state,

If it is in the refraction state, the second laser beam is refracted so that the beam angle of the second laser beam is deflected by 24°, and enters the coupling cavity 13 through the second penetration hole 15,

If it is not in the refraction state, the second laser beam is not refracted;

S8 The first laser beam and/or the second laser beam entering the coupling cavity pass through the dichroic mirror 10, and then pass through the coupling objective lens 17 for beam coupling, and then enter the optical fiber. The arrows in Figure 1 indicate the position where the optical fiber is connected.

Step S1 also includes the following specific steps:

S1.1 The first laser 1 emits the first laser beam, and the polarization angle of the first laser beam is adjusted through the third half-wave plate 8;

S1.2 The second laser 2 emits a second laser beam, and the polarization angle of the second laser beam is adjusted through the fourth half-wave plate 9 .

A light beam switching device and switching method of the present invention have the following beneficial effects:

First, the reflection part 31 and the refraction part 32 of the DMD micromirror 3 are controlled to realize switching between the first laser beam and the second laser beam, and the switching efficiency is high.

Second, the setting of the third half-wave plate 8 and the fourth half-wave plate 9 can effectively ensure that the first laser beam passing through the third half-wave plate 8 can be completely refracted by the first polarizing beam splitter prism 4, ensuring that the first laser beam passing through the fourth half-wave plate 8 The second laser beam of the wave plate 9 can be completely refracted by the second polarization beam splitter 5 prisms.

Third, the light-shielding sheet 11 divides the cavity into a switching cavity 12 and a coupling cavity 13, which can effectively isolate the stray light generated during the switching process in the switching cavity 12, prevent it from entering the coupling cavity 13, and ensure that the stray light in the coupling cavity 13 The light beam is not disturbed.

It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (4)

1. A light beam switching device, comprising a box body provided with a cavity inside and an optoelectronic device arranged in the cavity, characterized in that the optoelectronic device comprises: a first laser for emitting a first laser beam; a second laser for emitting a second laser beam; DMD mirror, used for reflecting and refracting the first laser beam and the second laser beam; The first polarization beam splitter prism is arranged on one side of the DMD micromirror, and is used to refract and transmit the first laser beam and/or the second laser beam; The second polarizing beam splitting prism is arranged on one side of the first polarizing beam splitting prism, and the first polarizing beam splitting prism is arranged between the DMD micromirror device and the second polarizing beam splitting prism, the second polarizing beam splitting prism A polarizing beam splitter is used to refract and transmit the first laser beam and/or the second laser beam; The first half-wave plate is arranged between the first polarization beam splitter and the DMD micromirror, and is used to adjust the polarization angle of the first laser beam; A second half-wave plate, arranged between the first polarization beam splitter and the second polarization beam splitter, for adjusting the polarization angle of the second laser beam; a third half-wave plate, the third half-wave plate is arranged between the first laser and the first polarization beam splitter, and is used to adjust the polarization angle of the first laser beam emitted by the first laser , so that the first laser beam passing through the third half-wave plate can be completely refracted by the first polarization beam splitter; A fourth half-wave plate, the fourth half-wave plate is arranged between the second laser and the second polarization beam splitter, and is used to adjust the polarization angle of the second laser beam emitted by the second laser , so that the second laser beam passing through the fourth half-wave plate can be completely refracted by the second polarization beam splitter; A dichroic mirror, the dichroic mirror is used for performing the first laser beam reflected and refracted by the DMD micromirror with the second laser beam reflected and refracted by the DMD micromirror Beam coupling; A shading sheet is provided inside the box, and the shading sheet divides the cavity into the switching cavity and the coupling cavity, and a first through-hole and a second through-hole are arranged on the light-shielding sheet, and the first through-hole is provided on the light-shielding sheet. A through hole is used for the first laser beam to shoot from the switching cavity to the coupling cavity, and the second through hole is used for the second laser beam to shoot from the switching cavity to the coupling cavity , the first laser, the second laser, the DMD micromirror, the first polarization beam splitter, the second polarization beam splitter, the first half-wave plate, the second half-wave plate, the third half-wave plate and the fourth half-wave plate are arranged in the switching cavity, and the dichroic mirror is arranged in the coupling cavity. 2. A beam switching method, characterized in that, utilizing the beam switching device according to claim 1 to switch the beam comprises the following steps: S1 The first laser emits a first laser beam, and the second laser emits a second laser beam; S2 The first laser beam and the second laser beam are refracted through the first polarization beam splitter and the second polarization beam splitter respectively; S3 the first laser beam refracted by the first polarization beam splitter prism passes through the first half-wave plate and shoots to the reflection part of the DMD micromirror device; S4 judges whether the reflection portion of the DMD reflector is a reflection state, If it is in the reflective state, after the original path reflection of the first laser beam, enter S5, If it is not in a reflective state, then the first laser beam is not reflected; S5 The polarization angle of the first laser beam reflected by the DMD mirror is adjusted through the first half-wave plate, so that the first laser beam is transmitted from the first polarization beam splitter and the second polarization beam splitter in turn, and passes through the first penetration hole into the coupling cavity; S6 the second laser beam refracted by the second polarization beam splitter prism is adjusted through the second half-wave plate to adjust the polarization angle, so that the second laser beam is transmitted from the second polarization beam splitter prism, and hits the refraction part of the DMD micromirror device; S7 judges whether the refraction portion of the DMD mirror is in a refraction state, If it is in the refraction state, refract the second laser beam so that the second laser beam enters the coupling cavity through the second through hole, If not in the refracted state, the second laser beam is not refracted. 3. The beam switching method according to claim 2, wherein the step S1 further comprises the following specific steps: S1.1 The first laser emits a first laser beam, and the polarization angle of the first laser beam is adjusted by a third half-wave plate; S1.2 The second laser emits a second laser beam, and the polarization angle of the second laser beam is adjusted by a fourth half-wave plate. 4. The beam switching method according to claim 2, wherein the beam switching method further comprises: S8 The first laser beam and/or the second laser beam entering the coupling cavity enters an optical fiber after passing through a dichroic mirror.