Fast polarization modulation multicolor beam combination laser

Abstract

The utility model discloses a fast polarization modulation multicolor beam combination laser, comprising monochromatic lasers, the output end of each monochromatic laser is provided with a laser beam combination module; each laser beam combining module is used for controlling the spatial positioning of a single laser beam, ensuring that each path of single laser beam can be converged into one beam, and outputting a combined laser beam; the fast polarization modulation multicolor beam combining laser further comprises a polarization modulation module and an optical fiber coupling module, the polarization modulation module comprises a rotatable half-wave plate assembly and a polarization beam splitter, and beam combining laser outputs linearly polarized light in different polarization directions through different rotation angles of the rotatable half-wave plate assembly; and then two paths of polarized light are output through the polarization beam splitter, the two paths of polarized light are P polarized light transmitted by the polarization beam splitter and S polarized light reflected by the polarization beam splitter, and the energy ratio of the two paths of polarized light is determined by the rotation angle of the half-wave plate. According to the utility model, not only is the flexibility of the laser improved, but also the adaptability to different application requirements is enhanced.

Description

Technical Field

[0001] This utility model relates to a laser, and more particularly to a fast polarization modulation multicolor beam combiner laser. Background Technology

[0002] Polarization is a crucial property of light. When light rays penetrate the surface of an optical element (such as a beam splitter) at a non-perpendicular angle, both reflection and transmission characteristics depend on polarization. In this case, the coordinate system used is defined by a plane containing the input and reflected light beams. If the polarization vector of the light ray lies within this plane, it is called p-polarization; if the polarization vector is perpendicular to the plane, it is called s-polarization. Any input polarization state can be expressed as the vector sum of the s and p components.

[0003] The application of multi-wavelength lasers in biofluorescence imaging is crucial. These lasers can excite multiple fluorescent dyes using different wavelengths, allowing researchers to simultaneously observe multiple biomarkers in the same sample, thus obtaining more comprehensive and richer information. This multiplex imaging technique not only improves the depth and breadth of data but also enables researchers to better understand the complexity of biological systems. Dual-channel output lasers further enhance the flexibility of experimental design, allowing the selection of the most suitable excitation energy combination according to specific research needs. By precisely adjusting the laser power, researchers can optimize imaging results, improve the signal-to-noise ratio, and thus enhance image clarity and resolution. In summary, the advantages of multi-wavelength lasers and their dual-channel output have opened up new possibilities for the development of biofluorescence imaging technology.

[0004] However, existing dual-channel output multi-wavelength lasers split the beam into two paths of P-polarized light and S-polarized light output by a fixed polarization beam splitter, and the light energy of the two outputs is fixed and cannot be adjusted. Utility Model Content

[0005] The purpose of this invention is to provide a fast polarization-modulated multicolor beam combiner laser to overcome or at least mitigate one of the above-mentioned defects of the prior art.

[0006] To achieve the above object, the utility model provides a kind of fast polarization modulation multicolor beam combination laser, it includes multichannel laser generation module, multichannel laser generation module includes N single-color laser, and the output end of each single-color laser is provided with a laser beam combination module;Each laser beam combination module is used to receive the single beam laser output of corresponding single-color laser, and the spatial positioning of single beam laser is controlled, to ensure that each single beam laser can converge into a beam, and output beam combination laser L;Fast polarization modulation multicolor beam combination laser further includes polarization modulation module and fiber coupling module, wherein: polarization modulation module includes rotatable half-wave plate component and polarization beam splitter, and beam combination laser is first passed through different rotation angles of rotatable half-wave plate component, and the linearly polarized light of different polarization directions is output corresponding, and then two polarization lights are output by polarization beam splitter, one polarization light is P polarization light that is transmitted by polarization beam splitter, another polarization light is S polarization light that is reflected by polarization beam splitter, and the energy ratio of two polarization lights is determined by the rotation angle of half-wave plate.

[0007] Further, fiber coupling module includes coupler and optical fiber, and P polarization light is coupled into optical fiber output by coupler, and S polarization light is coupled into another optical fiber output by another coupler.

[0008] Further, rotatable half-wave plate component includes half-wave plate and motorized rotary stage, and half-wave plate is loaded on motorized rotary stage, and both are linked.

[0009] Further, multichannel laser generation module further includes N parallel plates, and one parallel plate is arranged between each single-color laser and corresponding laser beam combination module, and parallel plate is used to adjust the propagation angle and position of corresponding single beam laser, to maximize the optical energy entering fiber coupling module.

[0010] Further, multichannel laser generation module includes first single-color laser, and the laser beam combination module corresponding to first single-color laser is mirror, and mirror is used to control the propagation direction of single beam laser output by first single-color laser to produce the inclination of first preset angle, and then first single-color laser beam is reflected and output.

[0011] Further, multichannel laser generation module further includes second single-color laser, and the laser beam combination module corresponding to second single-color laser is first dichroic mirror, and first dichroic mirror is used to transmit first single-color laser beam, and first dichroic mirror is also used to control the propagation direction of single beam laser output by second single-color laser to produce the inclination of second preset angle, and then reflect, converge into a beam with first single-color laser beam, and output two-color laser beam.

[0012] Further, the multi-channel laser generation module further comprises a third monochromatic laser, and a corresponding laser beam combination module of the third monochromatic laser is a second dichroic mirror, the second dichroic mirror is used for transmitting the two-color laser beams, and the second dichroic mirror is further used for controlling the propagation direction of the single laser beam output by the third monochromatic laser to produce a second preset angle of the tilted reflection, and the two-color laser beams are converged into the combined laser L.

[0013] Further, the fast polarization modulation multi-color combined laser further comprises a protective cover arranged outside the multi-channel laser generation module, the laser beam combination module, the polarization modulation module and the fiber coupling module.

[0014] The utility model discloses can output two S polarized light and P polarized light respectively, and can set up half wave plate and electric rotary table before polarization beam splitter, and the energy of two polarization light output is modulated quickly, therefore, the utility model not only improves the flexibility of laser, but also enhances the adaptability to different application needs. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structural schematic diagram of an embodiment of the utility model.

[0016] Figure 2 It is the principle schematic diagram of two polarization light output of an embodiment of the utility model. DETAILED DESCRIPTION

[0017] In the drawings, the same or similar notations are used to indicate the same or similar elements or elements having the same or similar functions. The embodiments of the utility model will be described in detail below with reference to the drawings.

[0018] In the description of the utility model, the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the utility model.

[0019] The fast polarization modulation multi-color combined laser provided by the embodiment of the utility model comprises a multi-channel laser generation module, and the multi-channel laser generation module comprises N monochromatic lasers, and the monochromatic laser is used for outputting a single-wavelength single laser beam. N is greater than or equal to 2, for example, the monochromatic laser can be three as shown in Figure 1 The first monochromatic laser 1, the second monochromatic laser 2 and the third monochromatic laser 3, and the number of monochromatic lasers can also be determined according to application requirements.

[0020] The output end of each single-color laser is provided with a laser beam combining module, each laser beam combining module is used for receiving single-beam laser output by the corresponding single-color laser, and the spatial positioning of the single-beam laser is controlled to ensure that the single-beam laser of each path can converge into a beam and output combined laser L.

[0021] In combination Figure 1 The multi-channel laser generation module includes a first single-color laser 1, and a corresponding laser beam combining module of the first single-color laser 1 is a mirror 7, which is used to control the propagation direction of single-beam laser output by the first single-color laser 1 to produce a first preset angle of inclination, and then reflect and output the first single-color laser beam. The first preset angle is determined according to the installation and adjustment frame of a general mirror and the installation and adjustment frame of a dichroic mirror, such as Thorlabs POLARIS-K1E, KM100, etc., which can adjust the angle range of ±4°.

[0022] The multi-channel laser generation module further includes a second single-color laser 2, and a corresponding laser beam combining module of the second single-color laser 2 is a first dichroic mirror 8, which is used to transmit the first single-color laser beam and reflect the single-beam laser output by the second single-color laser 2 after controlling the propagation direction of the single-beam laser to produce a second preset angle of inclination, and then converge with the first single-color laser beam into a beam and output a two-color laser beam. The second preset angle has the same range as the first preset angle.

[0023] The multi-channel laser generation module further includes a third single-color laser 3, and a corresponding laser beam combining module of the third single-color laser 3 is a second dichroic mirror 9, which is used to transmit the two-color laser beam and reflect the single-beam laser output by the third single-color laser 3 after controlling the propagation direction of the single-beam laser to produce a second preset angle of inclination, and then converge with the two-color laser beam into a combined laser L.

[0024] Of course, the above embodiment is for the case where N is 3, and in the case where N is other, for example, 4, then at this time the function of the second dichroic mirror 9 is exactly the same as that of the first dichroic mirror 8 in the above embodiment, and the last dichroic mirror, that is, the fourth dichroic mirror, has the same function as the second dichroic mirror 9 in the above embodiment, and so on.

[0025] The fast polarization modulation multi-color combined laser further includes a polarization modulation module and a fiber coupling module, wherein: Figure 2 As shown in FIG. 8, the polarization modulation module includes a rotatable half-wave plate assembly and a polarization beam splitter, and the rotatable half-wave plate assembly and the polarization beam splitter 12 are arranged in sequence on the propagation path of the combined laser L, and can realize fast polarization modulation. The process specifically includes:

[0026] The combined laser L first passes through a rotatable half-wave plate assembly, and different polarization directions of linearly polarized light are output corresponding to different rotation angles of the half-wave plate. Then the light passes through the polarization beam splitter 12 and outputs two polarized lights with a corresponding energy ratio. One of the polarized lights is P-polarized light transmitted by the polarization beam splitter 12, and the other is S-polarized light reflected by the polarization beam splitter 12. The energy ratio of the two polarized lights is determined by the rotation angle of the half-wave plate. The rotation angle of the half-wave plate affects the linear polarization direction of the incident light beam. Different linear polarization directions of the light beam are divided into p light and S light by the polarization beam splitter, and the energy of the two polarized lights is different. Therefore, the energy ratio of the two polarized lights is determined by the rotation angle of the half-wave plate. The energy modulation range of the P-polarized light is 0%-100% of the total energy of the combined laser, and the energy modulation range of the S-polarized light is 0%-100% of the total energy of the combined laser. The sum of the energy of the P-polarized light and the S-polarized light is the total energy of the combined laser. Here, the combined laser is divided into two paths, and the energy of the two paths can be quickly modulated by the rotatable half-wave plate assembly, thereby realizing the quick polarization modulation of the light energy. Therefore, the embodiment realizes the quick and free modulation of the energy of the two light paths. Such a design enables researchers to flexibly adjust the light intensity distribution under different polarization states, thereby meeting various experimental requirements. In addition, the quick modulation capability of the laser helps to improve the response speed of the system, adapt to dynamic experimental environments, and improve the efficiency of imaging and measurement. This innovative scheme has wide application potential in the field of laser application, optical experiment and related technology, and can promote the further development of optical research and application.

[0027] It should be noted that the polarization beam splitter can be a polarization beam splitter prism, a polarization beam splitter flat sheet, or other existing products with the same function, such as a metal wire grid polarization beam splitter.

[0028] In one embodiment, the fiber coupling module includes a coupler and an optical fiber, as shown in Figure 1 The P-polarized light is coupled into an optical fiber 16 through a coupler 13, and the S-polarized light is coupled into another optical fiber 15 through another coupler 14.

[0029] In one embodiment, the multi-channel laser generation module further includes N parallel flat plates 4, which can be realized by existing products such as Thorlabs WG11050, WG41050-UV, etc. The parallel flat plates 4 can be used as optical window sheets. Figure 1 As shown in the figure, the parallel flat plates 4 are arranged between the mirror 7 and the output end of the first monochromatic laser 1, the first dichroic mirror 8 and the second monochromatic laser 2, and the second dichroic mirror 9 and the output end of the third monochromatic laser 3, for adjusting the propagation angle and position of the single beam laser emitted from the corresponding monochromatic laser, so as to maximize the optical energy coupled into the optical fiber by the coupler.

[0030] In one embodiment, the rotatable half-wave plate assembly includes a half-wave plate 10 and an electrically driven rotary table 11, wherein the half-wave plate 10 is mounted on the electrically driven rotary table 11, and the two are linked together, for example... Figure 1 and Figure 2 As shown in the diagram, an electric rotary stage 12 is mounted on a half-wave plate 11 installed in front of the polarization beam splitter 12, enabling rapid and free modulation of the two optical energies. This design allows researchers to flexibly adjust the light intensity distribution under different polarization states, thereby meeting various experimental needs. The electric rotary stage can be implemented using existing products such as Solvay's K10CR2 and PRM1Z8 motor rotary stages.

[0031] In one embodiment, the fast polarization modulation multicolor beam combiner is characterized by further including a protective cover over the multichannel laser generating module, the laser beam combiner module, the polarization modulation module, and the fiber coupling module, for preventing dust and avoiding damage caused by accidental collisions.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fast polarization modulated multicolor combined laser, characterized in that, The multi-channel laser generating module comprises N single-color lasers, and an output end of each single-color laser is provided with a laser beam combining module; each laser beam combining module is used for receiving single-beam laser output by the corresponding single-color laser and controlling spatial positioning of the single-beam laser, so as to ensure that single-beam lasers of all channels can converge into one beam and output combined laser L; The fast polarization modulation multi-color combined laser further comprises a polarization modulation module and a fiber coupling module, wherein: the polarization modulation module comprises a rotatable half-wave plate assembly and a polarization beam splitter; the combined laser first passes through different rotation angles of the rotatable half-wave plate assembly to output linearly polarized light with different polarization directions, and then passes through the polarization beam splitter to output two polarized lights; one of the two polarized lights is P-polarized light transmitted by the polarization beam splitter, and the other is S-polarized light reflected by the polarization beam splitter; and the energy ratio of the two polarized lights is determined by the rotation angle of the half-wave plate.

2. The fast-polarization-modulated multichromatic combined laser of claim 1, wherein, The fiber coupling module comprises couplers and optical fibers; the P-polarized light is coupled into an optical fiber through a coupler for output, and the S-polarized light is coupled into another optical fiber through another coupler for output.

3. The fast-polarization-modulated polychromatic combined laser of claim 1 or 2, wherein, The rotatable half-wave plate assembly comprises a half-wave plate and a motorized rotary stage; the half-wave plate is loaded on the motorized rotary stage and linked with the motorized rotary stage.

4. The fast-polarization-modulated multichromatic combined laser of claim 3, wherein, The multi-channel laser generating module further comprises N parallel plates; one parallel plate is arranged between each single-color laser and the corresponding laser beam combining module; the parallel plate is used for adjusting the propagation angle and position of single-beam laser of the corresponding channel, so as to maximize the optical energy entering the fiber coupling module.

5. The fast-polarization-modulated multichromatic combined laser of claim 4, wherein, The multi-channel laser generating module comprises a first single-color laser (1); the corresponding laser beam combining module of the first single-color laser (1) is a mirror (7); the mirror (7) is used for controlling the propagation direction of single-beam laser output by the first single-color laser (1) to produce a first preset angle of inclination, and then reflecting the first single-color laser beam.

6. The fast-polarization-modulated multichromatic combined laser of claim 5, wherein, The multi-channel laser generating module further comprises a second single-color laser (2); the corresponding laser beam combining module of the second single-color laser (2) is a first dichroic mirror (8); the first dichroic mirror (8) is used for transmitting the first single-color laser beam; the first dichroic mirror (8) is further used for controlling the propagation direction of single-beam laser output by the second single-color laser (2) to produce a second preset angle of inclination, and then reflecting, converging with the first single-color laser beam into a beam, and outputting a two-color laser beam.

7. The fast-polarization-modulated multichromatic combined laser of claim 6, wherein, The multi-channel laser generating module further comprises a third single-color laser (3); the corresponding laser beam combining module of the third single-color laser (3) is a second dichroic mirror (9); the second dichroic mirror (9) is used for transmitting the two-color laser beam; the second dichroic mirror (9) is further used for controlling the propagation direction of single-beam laser output by the third single-color laser (3) to produce a second preset angle of inclination, and then reflecting, converging with the two-color laser beam into the combined laser L.

8. The fast-polarization-modulated multichromatic combined laser of claim 1, wherein, The multi-channel laser generating module, the laser beam combining module, the polarization modulation module and the fiber coupling module are covered by a protective cover.

Images