阅读说明：本技术 一种可拆装的密封激光保偏传输装置 (Detachable sealed laser polarization-maintaining transmission device ) 是由 周超 马思迁 于 2020-12-26 设计创作，主要内容包括：本发明涉及一种可拆装的密封激光保偏传输装置,包括：入射光连接组件,与入射光纤固定密封连接；出射光连接组件,与出射光纤固定密封连接；所述入射光连接组件与所述出射光连接组件对准并可拆卸连接,所述入射光连接组件和出射光连接组件之间设置有密封胶圈。通过对准并可拆卸连接的入射光连接组件和出射光连接组件,解决现有激光传输方式无法拆装,或拆卸后无法快速安装并保证传输激光偏振稳定性的问题。(The invention relates to a detachable sealed laser polarization-maintaining transmission device, which comprises: the incident light connecting assembly is fixedly and hermetically connected with the incident optical fiber; the emergent light connecting assembly is fixedly and hermetically connected with the emergent optical fiber; the incident light coupling assembling with emergent light coupling assembling aligns and can dismantle the connection, be provided with the sealing rubber ring between incident light coupling assembling and the emergent light coupling assembling. Through aiming at and can dismantle incident light coupling assembling and the emergent light coupling assembling of connection, solve the unable dismouting of current laser transmission mode, or can't install fast and guarantee the problem of transmission laser polarization stability after dismantling.)

1. A detachable sealed laser polarization-maintaining transmission device is characterized by comprising:

the incident light connecting assembly is fixedly and hermetically connected with the incident optical fiber (1);

the emergent light connecting assembly is fixedly and hermetically connected with the emergent optical fiber (11);

the incident light coupling assembling with the connection can be dismantled in the alignment of emergent light coupling assembling, be provided with between incident light coupling assembling and the emergent light coupling assembling sealed rubber ring (6).

2. The polarization maintaining transmission device according to claim 1, wherein the incident light connection assembly comprises an input collimating mirror (2), an input flange structure (3), an input optical window (4); the emergent light connecting assembly comprises an output optical window (8), an output flange structural part (9) and an output collimating mirror (10);

the incident optical fiber (1) is connected with the input collimating mirror (2), and the input collimating mirror (2) is fixedly connected with one side of the input flange structural part (3) in a sealing connection mode; the input optical window (4) is fixedly connected with the other side of the input flange structural part (3) in a sealing connection mode; the sealing rubber ring (6) is arranged on the periphery of the input optical window (4);

the outgoing optical fiber (11) is connected with the output collimating mirror (10), and the output collimating mirror (10) is fixedly connected with one side of the output flange structural member (9) in a sealing connection mode; the output optical window (8) is fixedly connected with the other side of the output flange structural part (9) in a sealing connection mode;

the input collimating mirror (2), the input flange structural part (3), the output flange structural part (9) and the output collimating mirror (10) are coaxially arranged along a light path.

3. A polarization maintaining transmission device according to claim 2, wherein the input optical window (4) and the output optical window (8) are arranged in parallel and form an angle of 1 ° to 5 ° with the laser transmission path.

4. A polarization maintaining transmission device according to claim 3, characterized in that the input optical window (4) and the output optical window (8) have a surface profile quality better than 1/2 wavelengths and a front and back surface parallelism better than 20 seconds.

5. A polarization maintaining transmission device according to claim 3, wherein the front and rear surfaces of the input optical window (4) and the output optical window (8) are coated with antireflection films.

6. Polarization maintaining transmission device according to claim 2, characterized in that an alignment device a (5) is provided on the side of the input flange structure (3) where the input optical window (4) is mounted; and an alignment device B (7) matched with the alignment device A (5) is arranged on one side of the output flange structural part (9) where the output optical window (8) is installed.

7. The polarization maintaining transmission device according to claim 6, wherein the alignment device A (5) comprises two terminals connected by a wire, the alignment device B (7) comprises two independent terminals, the two terminals of the alignment device B (7) are respectively connected with the positive and negative electrodes of a test power supply, and when the incident light connection assembly is aligned with the emergent light connection assembly, the two terminals of the alignment device A (5) are respectively in contact connection with the two terminals of the alignment device B (7) to form an alignment test loop.

8. A polarization maintaining transmission device according to claim 6, characterized in that said alignment means A (5) are arranged between said sealing rubber ring (6) and the rim of said input flange structure (3).

9. Polarization maintaining transmission device according to claim 2, characterized in that said input (2) and output (10) collimating mirrors use optical lenses of a uniform type; and when the connection is carried out, the end face of the input optical fiber (1) is positioned at the focus of the input collimating mirror (2), and the end face of the output optical fiber (11) is positioned at the focus of the output collimating mirror (10).

10. Polarization maintaining transmission device according to claim 9, characterized in that the device comprises at least one input fiber (1) and at least one output fiber (11), the input fibers (1) being in the same number and one-to-one correspondence with the output fibers (11).

Technical Field

The invention relates to the technical field of laser, in particular to a detachable sealed laser polarization-maintaining transmission device.

Background

A single-wavelength narrow-linewidth frequency stabilization laser source is a core device of a precision measuring instrument. By measuring the laser flight time, the laser interference phase or the laser light intensity, the high-precision distance measurement and speed measurement, the object surface structure, the material absorption spectrum, the quantum state measurement and the like are realized. The measuring method is widely applied to the fields of mapping, communication, atomic clocks, atomic gravimeters, quantum computing and the like.

In the field of precision measurement using a single-wavelength narrow-linewidth frequency stabilized laser, it is required that the laser is stably transmitted from a light source portion to a measuring instrument. However, the adoption of spatial light path transmission requires precise alignment between the light source and the measuring instrument, which results in an excessively large overall size of the device and a reduced adaptability to vibration. Thus, fiber optic transmission is a more advantageous transmission method. The existing optical fiber technology enables the optical fiber to resist the influence of temperature and vibration in the field environment, and stably transmit laser with low loss and polarization maintaining. However, the laser light source and the measuring instrument cannot be separated due to the optical fiber, so that the safety and convenience in transportation of the equipment are limited. Therefore, it is necessary to realize a polarization maintaining fiber airtight connection device capable of being quickly disassembled and assembled, so as to realize free disassembly and assembly between a measuring instrument and a laser light source and improve the adaptability of equipment.

Disclosure of Invention

The invention provides a detachable sealed laser polarization-maintaining transmission device aiming at the technical problems in the prior art and aiming at solving the problems that the existing laser transmission mode cannot be detached or rapidly installed after being detached and the polarization stability of the transmitted laser cannot be ensured.

The technical scheme for solving the technical problems is as follows:

a removable sealed laser polarization maintaining transmission device, comprising:

the incident light connecting assembly is fixedly and hermetically connected with the incident optical fiber;

the emergent light connecting assembly is fixedly and hermetically connected with the emergent optical fiber;

the incident light coupling assembling with emergent light coupling assembling aligns and can dismantle the connection, be provided with the sealing rubber ring between incident light coupling assembling and the emergent light coupling assembling.

The incident light connecting assembly comprises an input collimating mirror, an input flange structural part and an input optical window; the emergent light connecting assembly comprises an output optical window, an output flange structural member and an output collimating mirror;

the input collimating lens is fixedly connected with one side of the input flange structural part in a sealing connection mode; the input optical window is fixedly connected with the other side of the input flange structural member in a sealing connection mode; the sealing rubber ring is arranged on the periphery of the input optical window;

the emergent optical fiber is connected with the output collimating mirror, and the output collimating mirror is fixedly connected with one side of the output flange structural member in a sealing connection mode; the output optical window is fixedly connected with the other side of the output flange structural member in a sealing connection mode;

the input collimating lens, the input flange structural part, the output flange structural part and the output collimating lens are coaxially arranged along a light path.

The collimating lens realizes the conversion between the optical fiber transmission laser and the space transmission laser. In the laser space transmission process, the mode of utilizing optical window and flange structure spare realizes airtight sealed, guarantees on no steam, dust enter the laser transmission route. And the alignment device guides the connection device to align so as to realize the alignment of the transmission laser and the optical fiber polarization-maintaining axis.

Furthermore, the input optical window and the output optical window are arranged in parallel and form an included angle of 1-5 degrees with the laser transmission path, so that multiple reflection interference is prevented.

Furthermore, the input optical window and the output optical window are processed by materials suitable for laser with the working wavelength of the measuring instrument, the surface shape quality of the input optical window and the surface shape quality of the output optical window are superior to 1/2 wavelengths, and the parallelism of the front surface and the rear surface is superior to 20 seconds.

The front and back surfaces of the input optical window and the output optical window are plated with anti-reflection films, and the reflectivity is lower than 1%.

The input optical window and the output optical window can adopt polarizers, wave plates and other types of optical devices, and polarization stability of transmitted laser is improved.

Further, an alignment device A is arranged on one side of the input flange structural member, where the input optical window is installed; and an alignment device B matched with the alignment device A is arranged on one side of the output flange structural member, on which the output optical window is arranged.

Alignment device A includes two terminals that connect through the wire, alignment device B includes two independent terminals, just a test power supply's positive negative pole is connected respectively to two terminals of alignment device B, works as incident light coupling assembling with when emergent light coupling assembling aligns to connect, alignment device A's two terminals with two terminals of alignment device B contact respectively and connect, constitute and aim at test circuit.

Alignment means a and alignment means B are used to indicate whether the connection means are correctly aligned. When the coupling devices are aligned, the alignment device a and the alignment device B will be in communication and the control system of the apparatus will be signaled that the coupling devices are properly aligned. When the alignment of the connecting device has deviation or falls off due to faults, the alignment device A and the alignment device B have no access, a control system of the equipment obtains the non-connection alignment of the connecting device, and the laser light source stops laser output, so that the human eyes are prevented from being injured by laser. And a light indication can be additionally arranged in the alignment test loop, and after alignment, the loop is conducted, and light is lightened to remind a user.

The aligning device A is arranged between the sealing rubber ring and the edge of the input flange structural part.

The input collimating Lens and the output collimating Lens adopt unified optical lenses, and can adopt C-Lens lenses or aspheric lenses 12 and the like; and when the connection is carried out, the end face of the input optical fiber is positioned at the focus of the input collimating mirror, and the end face of the output optical fiber is positioned at the focus of the output collimating mirror.

The device comprises at least one input optical fiber and at least one output optical fiber, wherein the input optical fiber and the output optical fiber are the same in number and are in one-to-one correspondence.

The input optical fiber, the input collimating lens, the input flange structural part, the input optical window, the aligning device A and the sealing rubber ring form a fixed end of the sealed laser polarization-maintaining transmission device. The alignment device B, the output optical window, the output flange structural part, the output collimating mirror and the output optical fiber form a movable end of the sealed laser polarization-maintaining transmission device. The fixed end and the movable end jointly form a detachable sealed laser polarization-maintaining transmission device. After the fixed end and the movable end are aligned and hermetically connected, the polarization stability of the conducted light is realized, and meanwhile, the sealing performance of the equipment is not damaged.

The laser light source enters the polarization maintaining optical fiber airtight connecting device capable of being rapidly disassembled and assembled through the input optical fiber. And the light enters the input collimating mirror from the input optical fiber to form a spatial Gaussian beam. The input optical fiber and the input collimating mirror are fixed with the input flange structural part in a sealing connection mode. The input optical window, the alignment means a, is fixed to the input flange structure 3 by means of a similar sealing connection. The input flange structure is provided with a sealing rubber ring. When the fixed end is aligned with the movable end and hermetically connected, the laser passes through the input optical window and is output to the movable end. After passing through the output window, the light is converged into the output optical fiber by the output collimating lens and is transmitted into the equipment with sealing requirements. In order to not destroy the sealing performance of the equipment, the output optical window, the alignment device B and the output collimating mirror are structurally fixed with the output flange in a sealing connection mode.

The input optical fiber and the output optical fiber are single-mode polarization-maintaining optical fibers suitable for the transmission of laser with the working wavelength of a measuring instrument.

The invention has the beneficial effects that: the problem of stable polarization maintaining of optical fiber butt joint can be solved, and the repeated plugging and unplugging use requirements can be met.

The space light path is in a sealed state, and the whole device is not subjected to the problems of dewing, frosting or environmental dust pollution on the light path caused by the change of the temperature and the humidity of the environment;

the laser beam is directly output to the external environment without optical fiber, so that the problem of end face damage caused by optical fiber end face pollution is solved, and the optical window can be quickly erased when being polluted, and is convenient and quick to maintain.

The alignment device of the invention has a feedback signal, can guide the connection alignment of the device, and simultaneously has the function of preventing the accident that laser radiation damages human eyes.

Drawings

Fig. 1 is an exploded view of a detachable sealed laser polarization maintaining transmission device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an incident light connection component of a polarization maintaining transmission device according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a polarization maintaining transmission apparatus according to an embodiment of the present invention after alignment connection;

FIG. 4 is a schematic diagram of a C-Lens-based collimating Lens provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of an aspheric lens based collimating lens provided by an embodiment of the present invention;

fig. 6 is a rear sectional view of a polarization maintaining transmission device according to an embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-input optical fiber, 2-input collimating mirror, 3-input flange structural part, 4-input optical window, 5-alignment device A, 6-sealing rubber ring, 7-alignment device B, 8-output optical window, 9-output flange structural part, 10-output collimating mirror, 11-output optical fiber and 12-aspheric collimating lens.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

Example 1

As shown in fig. 1 to 6, the detachable sealed laser polarization maintaining transmission device in this embodiment includes an input optical fiber 1, an input collimating mirror 2, an input flange structure 3, an input optical window 4, an alignment device a5, a sealing rubber ring 6, an alignment device B7, an output optical window 8, an output flange structure 9, an output collimating mirror 10, and an output optical fiber 11.

In this embodiment, the input optical fiber 1 is 780nm single-mode polarization maintaining fiber with a core diameter of about 4.2 μm. One end of the input optical fiber 1 is connected with a narrow linewidth optical fiber laser. A1560 nm single-frequency laser with the output line width less than or equal to 20kHz and the output power of about 30mW is used for amplifying the output power of 5W by an erbium-doped optical fiber amplifier and injecting the amplified output power into the periodically polarized lithium niobate crystal. The injected laser meets the temperature matching condition through precise temperature control, and the double-frequency laser of 1560nm laser, namely 780nm laser, is output. The other section of the input optical fiber 1 is fixedly connected with the collimating Lens 2 by adopting a welding technology, the collimating Lens can adopt a C-Lens collimating Lens or a non-spherical collimating Lens, as shown in fig. 4 and 5, the C-Lens collimating Lens with the focal length of 5mm is adopted in the embodiment, and the laser beam with the Gaussian diameter of 1mm is output. The input flange structural member 3 is integrally processed from an aluminum alloy material, and the collimating lens 2 is hermetically connected with the input flange structural member through optical sealant. And 3-degree wedge angles are formed between the external light-emitting holes of the input flange structural part 3 and the flange mounting surface and used for mounting an input optical window 4. The input optical window 4 is processed by fused quartz, the size is phi 25.4mm multiplied by 3mm, the installation area adopts optical sealant, and the optical sealant is under the protection of nitrogen gas during installation to ensure that the internal space is dry. And machining a mounting hole at the position 50mm in diameter of the input flange structural part for mounting the alignment device A5. The alignment device A5 is made of precision machining pins, and the outer ends of the pins are communicated. The positioning precision of the contact pin is better than 0.05 mm. The sealing rubber ring 6 is made of natural rubber materials, is processed into a material with the diameter of 1.5mm and the positive tolerance of +0.3mm/+0.1mm, and ensures the sealing performance when being butted with the output flange structural member 9. The alignment device B7 is identical to the alignment device a5 and is fabricated from precision machined pins with outer ends connected to wires for transmitting communication signals to a control system. The alignment device B7 is installed in the installation hole of the output flange structure 9 with the diameter of 50mm, and ensures that the flange is in butt joint with the alignment device A5 when in butt joint. According to the positioning precision, the alignment device ensures that the deviation of the alignment angle is better than 2mrad, and the change of the polarization extinction ratio is less than 500: 1, superior to polarization maintaining fiber. The output optical window 8 is in the same embodiment as the input optical window 4. The output flange structure 9 is of the same embodiment as the input flange structure 3. The output collimator 10 is implemented in the same way as the input collimator 2. The output optical fiber 11 is in the same embodiment as the input optical fiber 1.

Example 2

In the present example, a polarizing plate having a transmittance of 80% and a polarization extinction ratio of 100000:1 was used for the input optical window 4 and the output optical window 8. Other components and the connection relationship of the components are the same as those in embodiment 1. The laser transmission effect with better polarization maintaining performance can be obtained.

Example 3

In this embodiment, the number of the input optical fibers 1 and the number of the output optical fibers 11 are more than one, the number of the output collimating mirrors 2 is matched with that of the input collimating mirrors 10, and the output flange structural member 3 and the input flange structural member 9 are processed with the same number of collimating lens mounting holes and assembled. Other components and the connection relationship of the components are the same as those in embodiment 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.