Optical fiber concave mirror processing device and method

Abstract

The present invention discloses a fiber concave mirror processing device and method. The device of the present invention comprises a laser, a first focusing lens, a second focusing lens, a third focusing lens, a microscope and a three-dimensional displacement platform. The laser, the first focusing lens, the second focusing lens and the third focusing lens are sequentially arranged along the optical path. The laser can emit a Gaussian laser beam. The first focusing lens and the second focusing lens collimate and expand the Gaussian laser beam emitted by the laser. The third focusing lens focuses the collimated and expanded Gaussian laser beam. The three-dimensional displacement platform is located at the focus of the Gaussian laser beam and is used to carry and move the optical fiber. The microscope is located above the three-dimensional displacement platform and is used to observe the optical fiber position and the marking spot position. The present invention has simple process, high precision and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber processing, and in particular to an optical fiber concave mirror processing device and method. Background Art

[0002] With the rapid development of information technology, a complete information system is increasingly required to develop in the direction of integration, miniaturization, and micro-miniaturization as much as possible, and to achieve multi-functionality in a small space. Optical fiber itself has the characteristics of miniaturization, low cost, flexible design and manufacturing, and easy integration. Micro-nano components made of optical fiber can meet the requirements of the continuous development of information technology. The optical fiber concave mirror is an important micro-nano optical component, which can be widely used in the fields of optical fiber communication, optical fiber sensing, lasers, and quantum optics.

[0003] At present, the main methods for preparing optical fiber concave mirrors are chemical etching, interference lithography, femtosecond laser, electron beam etching, etc. Although these processing methods are mature, the processing flow is complicated and the precision requirements are very high, so the cost will also be very high. Summary of the invention

[0004] Purpose of the invention: In view of the problems existing in the prior art, the present invention provides a device and method for processing optical fiber concave mirrors with simple process, high precision and low cost.

[0005] Technical solution: The optical fiber concave mirror processing device described in the present invention comprises a laser, a first focusing lens, a second focusing lens, a third focusing lens, a microscope and a three-dimensional displacement platform. The laser, the first focusing lens, the second focusing lens and the third focusing lens are sequentially arranged along the optical path. The laser can emit a Gaussian laser beam. The first focusing lens and the second focusing lens collimate and expand the Gaussian laser beam emitted by the laser. The third focusing lens focuses the collimated and expanded Gaussian laser beam. The three-dimensional displacement platform is located at the focus of the Gaussian laser beam and is used to carry and move the optical fiber. The microscope is located above the three-dimensional displacement platform and is used to observe the position of the optical fiber and the position of the marking spot.

[0006] Furthermore, the laser is a CO2 laser. The first focusing lens, the second focusing lens, and the third focusing lens are all zinc selenide focusing lenses. The first focusing lens and the second focusing lens have different focal lengths.

[0007] Furthermore, the device also includes a reflector, which is placed between the third focusing lens and the three-dimensional displacement platform when marking the spot position and is placed at 45°, and is moved away when processing the optical fiber concave mirror.

[0008] The optical fiber concave mirror processing method of the present invention is implemented based on the above processing device, and the method specifically includes:

[0009] (1) Fix the quartz glass sheet on a three-dimensional translation stage, adjust the laser parameters and turn on the laser so that the laser makes a pit on the quartz glass sheet, and then turn off the laser;

[0010] (2) Place a reflector between the third focusing lens and the three-dimensional translation stage, with the reflector placed at 45° and the reflective surface facing the quartz glass plate. Place a microscope at the other end of the light beam reflected by the reflector, observe the position of the pit on the quartz glass plate and mark it.

[0011] (3) Replace the quartz glass sheet with a ground and polished debugging optical fiber, and adjust the three-dimensional displacement platform so that the end face of the debugging optical fiber is located at the position marked under the microscope;

[0012] (4) Move the reflector away, adjust the laser parameters and turn on the laser, fine-tune the three-dimensional displacement platform under a microscope so that the laser beam hits the center of the debugging optical fiber core, and turn off the laser;

[0013] (5) Replace the debug optical fiber with the optical fiber to be processed, turn on the laser, and the laser beam forms a pit in the middle of the core of the optical fiber to be processed to make a fiber concave mirror.

[0014] Furthermore, the laser parameters are: frequency of 20kHz, processing power of 0.1W to 0.3W, and action time of 0.8ms to 1.5ms.

[0015] Furthermore, a microscope is placed in both the horizontal and vertical directions of the optical fiber when fine-tuning the three-dimensional displacement platform.

[0016] Furthermore, the optical fiber is a single-mode quartz optical fiber with a central wavelength of 1550 nm or 780 nm.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention utilizes a laser to perform micro-nano processing on an optical fiber, and the high-energy light beam it generates acts instantaneously on the material, causing the material to be quickly heated to vaporize and evaporate to form holes. The processing method is simple, with high precision and low cost, and the surface finish of the pits produced is very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the optical fiber concave mirror processing device provided by the present invention when marking the light spot position;

[0019] Figure 2 It is a structural schematic diagram of the optical fiber concave mirror processing device provided by the present invention when processing an optical fiber concave mirror. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Example 1

[0022] This embodiment provides a fiber optic concave mirror processing device, such as Figure 1 As shown, it includes a laser 1, a first focusing lens 2, a second focusing lens 3, a third focusing lens 4, a microscope 5, a three-dimensional displacement platform 8, and a reflector 9. The laser 1, the first focusing lens 2, the second focusing lens 3, and the third focusing lens 4 are arranged in sequence along the optical path. The laser 1 can emit a Gaussian laser beam, and can specifically be a CO2 laser. The first focusing lens 2 and the second focusing lens 3 are specifically zinc selenide focusing lenses with focal lengths of 25 mm and 50 mm, respectively, which are used to collimate and expand the Gaussian laser beam emitted by the laser 1. The third focusing lens 4 is a zinc selenide focusing lens with a focal length of 37.5 mm, which is used to focus the collimated and expanded Gaussian laser beam. The three-dimensional displacement platform 8 is located at the focus of the Gaussian laser beam and is used to carry and move the optical fiber 7. The microscope 5 is located above the three-dimensional displacement platform 8 and is used to observe the optical fiber position and mark the spot position. The reflector 9 is specifically a plane reflector, which is placed between the third focusing lens 4 and the three-dimensional displacement platform 8 when marking the spot position, and is placed at 45°, as shown in FIG. Figure 1 As shown, it is moved away when processing the optical fiber concave mirror, such as Figure 2 As shown. The optical fiber concave mirror processing device of this embodiment may also include a computer 10 for inputting processing parameters to the laser 1, including processing time, processing power, etc. In order to be able to observe and adjust the position of the optical fiber more accurately, when processing the optical fiber concave mirror, in addition to the microscope 5 placed in the vertical direction of the optical fiber, a microscope 6 is placed in the horizontal direction, such as Figure 2 shown.

[0023] Example 2

[0024] This embodiment provides a method for processing a concave optical fiber mirror. The method is implemented based on the processing device described in Embodiment 1 and specifically includes the following steps:

[0025] (1) Fix the quartz glass sheet on the three-dimensional translation stage 8, adjust the laser parameters to: frequency 20 Hz, processing time 10 ms, processing power 1 W, and turn on the laser so that the laser makes a pit on the quartz glass sheet, and then turn off the laser;

[0026] (2) Figure 1 As shown, the reflector 9 is placed between the third focusing lens 4 and the three-dimensional displacement stage 8, with the reflective surface facing the quartz glass sheet, and the microscope 5 is placed at the other end of the light beam reflected by the reflector 9, and the position of the pit on the quartz glass sheet is observed and marked, and the position of the pit is the light spot position;

[0027] (3) Replace the quartz glass sheet with a ground and polished single-mode debugging optical fiber 7 with a central wavelength of 780 nm, and adjust the three-dimensional displacement platform 8 so that the end face of the single-mode debugging optical fiber 7 is located at the position marked under the microscope 5;

[0028] (4) Remove the reflector, adjust the laser parameters to: processing time 0.8ms, processing power 0.3w, and turn on the laser. Figure 2 As shown, a microscope 6 is placed in the horizontal direction, and the three-dimensional displacement platform 8 is fine-tuned under the microscopes 5 and 6 so that the laser beam hits the middle of the core of the single-mode debugging optical fiber 7;

[0029] (5) The single-mode debugging optical fiber 7 is replaced with a single-mode optical fiber to be processed with a central wavelength of 780 nm, and the laser is turned on. The high-energy light beam emitted by the laser and the material on the end face of the optical fiber are vaporized and evaporated in a short time to form a pit, thereby making the desired concave optical fiber mirror.

[0030] Example 3

[0031] This embodiment provides another method for processing a concave optical fiber mirror. The method is implemented based on the processing device described in Embodiment 1 and specifically includes the following steps:

[0032] (1) Fix the quartz glass sheet on the three-dimensional translation stage 8, adjust the laser parameters to: frequency 20 Hz, processing time 10 ms, processing power 1 W, and turn on the laser so that the laser makes a pit on the quartz glass sheet, and then turn off the laser;

[0033] (2) Figure 1 As shown, the reflector 9 is placed between the third focusing lens 4 and the three-dimensional displacement stage 8, with the reflective surface facing the quartz glass sheet, and the microscope 5 is placed at the other end of the light beam reflected by the reflector 9, and the position of the pit on the quartz glass sheet is observed and marked, and the position of the pit is the light spot position;

[0034] (3) Replace the quartz glass sheet with a ground and polished single-mode debugging optical fiber 7 with a central wavelength of 1550 nm, and adjust the three-dimensional displacement platform 8 so that the end face of the single-mode debugging optical fiber 7 is located at the position marked under the microscope 5;

[0035] (4) Remove the reflector, adjust the laser parameters to: processing time 1ms, processing power 0.2w, and turn on the laser. Figure 2 As shown, a microscope 6 is placed in the horizontal direction, and the three-dimensional displacement platform 8 is fine-tuned under the microscopes 5 and 6 so that the laser beam hits the middle of the core of the single-mode debugging optical fiber 7;

[0036] (5) The single-mode debugging optical fiber 7 is replaced with a single-mode optical fiber to be processed with a central wavelength of 1550 nm, and the laser is turned on. The high-energy light beam emitted by the laser and the material on the end face of the optical fiber are vaporized and evaporated in a short time to form a pit, thereby making the desired concave optical fiber mirror.

[0037] The above disclosure is only the preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An optical fiber concave mirror processing device, characterized in that: The invention comprises a laser, a first focusing lens, a second focusing lens, a third focusing lens, a microscope and a three-dimensional displacement platform. The laser, the first focusing lens, the second focusing lens and the third focusing lens are sequentially arranged along the optical path. The laser can emit a Gaussian laser beam. The first focusing lens and the second focusing lens collimate and expand the Gaussian laser beam emitted by the laser. The third focusing lens focuses the collimated and expanded Gaussian laser beam. The three-dimensional displacement platform is located at the focus of the Gaussian laser beam and is used for carrying and moving the optical fiber. The microscope is located above the three-dimensional displacement platform and is used for observing the position of the optical fiber and the position of the marking light spot.

2. The optical fiber concave mirror processing device according to claim 1, characterized in that: The laser is a CO2 laser.

3. The optical fiber concave mirror processing device according to claim 1, characterized in that: The first focusing lens, the second focusing lens and the third focusing lens are all zinc selenide focusing lenses.

4. The optical fiber concave mirror processing device according to claim 1, characterized in that: The focal lengths of the first focusing lens and the second focusing lens are different.

5. The optical fiber concave mirror processing device according to claim 1, characterized in that: The device also includes a reflecting mirror, which is placed between the third focusing lens and the three-dimensional displacement platform when marking the position of the light spot and is placed at 45 degrees, and is moved away when processing the optical fiber concave mirror.

6. A method for processing an optical fiber concave mirror, characterized in that: Based on the processing device according to any one of claims 1 to 4, the method specifically comprises: (1) Fix the quartz glass sheet on a three-dimensional translation stage, adjust the laser parameters and turn on the laser so that the laser makes a pit on the quartz glass sheet, and then turn off the laser; (2) Place a reflector between the third focusing lens and the three-dimensional translation stage, with the reflector placed at 45° and the reflective surface facing the quartz glass plate. Place a microscope at the other end of the light beam reflected by the reflector, observe the position of the pit on the quartz glass plate and mark it. (3) Replace the quartz glass sheet with a ground and polished debugging optical fiber, and adjust the three-dimensional displacement platform so that the end face of the debugging optical fiber is located at the position marked under the microscope; (4) Move the reflector away, adjust the laser parameters and turn on the laser, fine-tune the three-dimensional displacement platform under a microscope so that the laser beam hits the center of the debugging optical fiber core, and turn off the laser; (5) Replace the debug optical fiber with the optical fiber to be processed, turn on the laser, and the laser beam forms a pit in the middle of the core of the optical fiber to be processed to make a fiber concave mirror.

7. The method for processing an optical fiber concave mirror according to claim 6, characterized in that: The laser parameters are: frequency of 20kHz, processing power of 0.1W-0.3W, action time of 0.8ms-1.5ms.

8. The method for processing an optical fiber concave mirror according to claim 6, characterized in that: When fine-tuning the three-dimensional displacement platform, a microscope is placed in both the horizontal and vertical directions of the optical fiber.

9. The method for processing an optical fiber concave mirror according to claim 6, characterized in that: The optical fiber is a single-mode quartz optical fiber with a central wavelength of 1550nm or 780nm.

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