Tunable laser generation method

Abstract

The invention discloses a tunable laser generation method. The method comprises the following steps: connecting a plurality of color filters in the circumferential direction of a filter turntable; one color filter on the filter turntable is positioned between the two off-axis parabolic reflectors; selecting a corresponding color filter on the filter turntable according to the wavelength of the required emergent laser; the filter turntable is rotated until the selected color filter is rotated to a position between the two off-axis parabolic reflectors; the broadband spectrum laser light source structure emits laser, the laser is reflected by the off-axis parabolic reflector to form a collimated light beam, the collimated light beam passes through the color filter and then enters the second off-axis parabolic reflector to be reflected and converged on the focus, the focus is converged on the optical fiber, the laser is emitted from the optical fiber, and then the laser with the needed wavelength is generated. The size of the color filter does not need to be adjusted according to different placing positions of the color filter, and the required color filter can be selected by rotating the filter turntable, so that the requirement of emitting light with specified wavelength is met, and the stability of an optical system is not influenced.

Description

Technical Field

[0001] The invention relates to the field of optical technology, in particular to a method for generating tunable laser. Background Art

[0002] Laser light sources have been widely used in various fields of industrial and agricultural production and science and technology, such as laser processing (cutting, welding, punching, heat treatment, scoring), nuclear fusion, isotope separation, medical instruments (scalpels, coagulators), detectors, fiber optic communication light sources, holographic photography light sources, stage art light sources, laser video records, laser fax, laser typesetting and printing, optical computers, laser weapons, etc. When using a wide-spectrum laser light source, if only one type of light is needed, the usual method is to add a color filter to the optical system, but this operation method will adjust the size of the color filter according to the different positions of the color filter. The farther the color filter is from the fiber head, the larger the color filter is needed (the farther the color filter is from the fiber head, the more scattered the light reaching the color filter after the fiber head emits light, so the larger the color filter is needed), and if the wavelength of light needs to be changed, it may be necessary to plug and unplug the replacement color filter (the color filter is generally plugged into the fixture, and the color filter can be replaced by plugging and unplugging the color filter on the fixture). The plug-in process is time-consuming and laborious, and improper operation may also affect the stability of the optical system.

[0003] Therefore, it is necessary to provide a new method for converting a wide-spectrum laser light source into a tunable laser light source, which can also be called a tunable laser generation method, to solve the above-mentioned technical problems. That is, this method can satisfy the requirement that the wide-spectrum laser light source only emits one required light without affecting the stability of the optical system, and there is no need to adjust the color filter size according to the different placement positions of the color filter. The color filter can be replaced by rotating the turntable, which is simple and convenient to operate and will not affect the stability of the optical system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tunable laser generating method in view of the deficiencies of the above-mentioned prior art. Compared with the previous method of converting a wide-spectrum laser light source into a tunable laser light source, the tunable laser generating method is no longer limited to the position of the color filter, and there is no need to adjust the color filter size according to the different placement positions of the color filters. Moreover, multiple groups of color filters can be placed at the same time through a filter turntable, which is more convenient to use. The required color filter can be selected by rotating the filter turntable to meet the requirement of emitting light of a specified wavelength, and the stability of the optical system will not be affected.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0006] A method for generating a tunable laser comprises the following steps:

[0007] Step 1, a plurality of color filters are connected at intervals in the circumferential direction of the filter wheel; one of the color filters on the filter wheel is located between two off-axis parabolic reflectors, and the color filter is used to transmit light of a specific wavelength;

[0008] Step 2, determine the wavelength of the desired output laser, and select the corresponding color filter on the filter wheel according to the wavelength;

[0009] Step 3, rotate the filter wheel until the color filter selected in step 2 is rotated between the two off-axis parabolic reflectors;

[0010] Step 4: The wide-spectrum laser light source structure emits laser light, which is reflected by an off-axis parabolic reflector to form a collimated light beam. The collimated light beam then passes through a color filter located between the two off-axis parabolic reflectors and enters a second off-axis parabolic reflector to be reflected and converged on a focal point. The focal point then converges on an optical fiber, and laser light is emitted from the optical fiber, thereby generating laser light of a desired wavelength.

[0011] As a further improved technical solution of the present invention, before step 1, the following is further included:

[0012] Step 1a, installing two off-axis parabolic reflectors on the reflector housing respectively;

[0013] A notch is provided in the middle of the reflector housing and the notch divides the reflector housing into a left half housing and a right half housing; an L-shaped left optical path channel is provided on the left half housing, and the off-axis parabolic reflector is installed in the left optical path channel; an L-shaped right optical path channel is provided on the right half housing, and another off-axis parabolic reflector is installed in the right optical path channel; the left optical path channel is connected with the right optical path channel through the notch;

[0014] The reflector housing is connected to the wide-spectrum laser light source structure, wherein the right optical path channel of the reflector housing is communicated with the light outlet of the wide-spectrum laser light source structure.

[0015] As a further improved technical solution of the present invention, the step 1 is specifically:

[0016] A plurality of mounting holes evenly and spaced apart are provided in the circumferential direction of the filter wheel, color filters are inserted into the mounting holes, the output end of the motor is connected to the center of the filter wheel, and the motor is then connected to the reflector housing, and one of the color filters on the filter wheel is located between the two off-axis parabolic reflectors, that is, located in the notch of the reflector housing;

[0017] The step 3 is specifically as follows:

[0018] The motor is connected to a power source, and the motor is started, and the motor drives the filter turntable to rotate until the color filter selected in step 2 is rotated between the two off-axis parabolic reflectors, that is, into the gap of the reflector housing; the motor stops running.

[0019] As a further improved technical solution of the present invention, the step 4 is specifically as follows:

[0020] The wide-spectrum laser light source structure emits laser, and the light enters the right optical path channel of the reflector housing through the light outlet of the wide-spectrum laser light source structure, and is reflected by the off-axis parabolic reflector in the right optical path channel to form a collimated light beam. The collimated light beam then enters the left optical path channel of the reflector housing after passing through the color filter in the notch of the reflector housing on the filter turntable, and is then reflected by the off-axis parabolic reflector in the left optical path channel and converged on a focus. The focus is then converged on the optical fiber in the focusing seat, and laser is emitted from the optical fiber, thereby generating laser of a required wavelength.

[0021] As a further improved technical solution of the present invention, a focusing seat is connected to the left half shell, a light inlet of the focusing seat is communicated with a left optical path channel on the left half shell, and an optical fiber is connected inside the focusing seat.

[0022] As a further improved technical solution of the present invention, the convergence point of the light beam emitted by the off-axis parabolic reflector in the left optical path channel is at the same height as the light outlet of the wide-spectrum laser light source structure.

[0023] As a further improved technical solution of the present invention, the two off-axis parabolic reflectors are fixedly connected to the left reflector seat and the right reflector seat respectively;

[0024] A left mounting hole is provided on the left half shell of the reflector housing, the left mounting hole is connected to the L-shaped left optical path channel, the off-axis parabolic reflector on the left reflector seat extends from the left mounting hole into the left optical path channel, and the left reflector seat is connected to the left half shell by screws and top screws;

[0025] A right mounting hole is provided on the right half shell of the reflector shell, the right mounting hole is connected to the L-shaped right optical path channel, the off-axis parabolic reflector on the right reflector seat extends from the right mounting hole into the right optical path channel, and the right reflector seat is connected to the right half shell by screws and top screws.

[0026] As a further improved technical solution of the present invention, the motor is connected to the reflector housing via a motor mounting plate.

[0027] As a further improved technical solution of the present invention, the focusing seat includes a fiber focusing seat, a fiber centering seat, a pin, an SMA socket sleeve, an adjusting screw sleeve, and an SMA socket. The fiber focusing seat sleeve is arranged on the outside of the fiber centering seat, and the adjusting screw sleeve is arranged on the outside of the fiber focusing seat. Pin holes are provided on the fiber centering seat and the adjusting screw sleeve. A strip hole is opened on the fiber focusing seat. The pin passes through the pin hole of the adjusting screw sleeve, the strip hole on the fiber focusing seat, and the pin hole of the fiber centering seat in sequence. The fiber focusing seat is also provided with a tightening threaded through hole. The fiber focusing seat is used to lock with the fiber centering seat through the tightening threaded through hole and the top screw. The fiber centering seat is connected to the SMA socket sleeve through the top screw, and the SMA socket sleeve is connected to the SMA socket through a screw.

[0028] As a further improved technical solution of the present invention, a rubber ring is further connected to the outer side of the adjusting screw sleeve.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides a tunable laser generation method, that is, converting a wide-spectrum laser light source into a tunable laser light source. Compared with the previous method of converting a wide-spectrum laser light source into a tunable laser light source, it is no longer limited to the position of the color filter, the color filter can be placed arbitrarily, and multiple groups of color filters can be placed at the same time through a filter turntable. It is more convenient to use and has a simpler structure, and can also meet the requirement of emitting light of a specified wavelength.

[0031] The present invention uses an off-axis parabolic reflector to focus a parallel light beam or a collimated point light source without dispersion, and its off-axis design can separate the focus from the light path. When the collimated light beam is incident vertically on the bottom of the reflector base, the reflected light will converge at the focal position. A point light source is placed at the focal point to obtain a collimated light beam. Its characteristic is that the light emitted by the laser light source is first converted into a collimated light beam through the first off-axis parabolic reflector, thereby extending the usable light beam length, and then the light beam is restored after passing through the second off-axis parabolic reflector. Since the light becomes a collimated beam after passing through the first off-axis parabolic reflector, the position of the color filter is no longer limited, and the color filters of the same size can be placed in different positions, that is, there is no need to replace color filters of different sizes according to the placement of the color filters, and the color filters can be placed arbitrarily, and multiple groups of color filters can be installed on the filter turntable at the same time. When the wavelength needs to be changed, the filter turntable is driven by a motor to rotate to replace the required color filter. There is no need to replace the color filter by plugging and unplugging, which will not affect the stability of the optical system. It is more convenient to use and has a simpler structure. Similarly, the required color filter is selected by rotating the filter turntable to meet the requirement of emitting light of a specified wavelength, and the stability of the optical system is higher.

[0032] During the installation process of the present invention, the distance from the center of the off-axis parabolic reflector in the right half shell of the reflector housing to the light outlet of the wide-spectrum laser light source structure can be obtained according to the focal length of the off-axis parabolic reflector on the right reflector seat, and the structural shape and size of the reflector housing are accurately designed to ensure that the off-axis parabolic reflector in the right half shell of the reflector housing and the light outlet of the wide-spectrum laser light source structure are at the same height, and to ensure that the distance between the two is equal to the focal length of the off-axis parabolic reflector on the right half shell, so that the light beam reflected from the off-axis parabolic reflector on the right half shell is collimated, and the emitted light beam is observed at the farthest possible distance to see whether the size, height and level are consistent with those at a nearby location. Since the size accuracy and distance are ensured when the tooling is manufactured, the two basically do not need to be adjusted, and the light beam reflected from the off-axis parabolic reflector on the right half shell is collimated. Subsequently, the motor and the filter turntable are combined and installed in the device. The filter turntable can be controlled by the motor to rotate and then the color filter can be replaced, so that the light beam passes through the color filter and then hits the off-axis parabolic reflector in the left half of the shell. After being reflected by the off-axis parabolic reflector in the left half of the shell, the reflected light is converged at the focus. Under the condition of ensuring the dimensional accuracy of the reflector shell in the device and the installation position accuracy between the reflector shell and the off-axis parabolic reflector, after assembling the various structures, it is possible to ensure that the height of the converged light beam is consistent with the light outlet of the wide-spectrum laser light source structure without adjustment. Finally, the focusing seat is installed, and the optical fiber is inserted into the focusing seat. The focusing seat is adjusted to make the focus of the light beam converge on the optical fiber, and finally the light beam is emitted from the optical fiber, and it is ensured that the emission angle of the light beam from the optical fiber is consistent with the emission angle of the wide-spectrum laser light source, and the emission angle of the light will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0034] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0035] Figure 3 It is the front view of the present invention.

[0036] Figure 4 for Figure 3 Middle AA section view.

[0037] Figure 5 It is a top view of the present invention.

[0038] Figure 6 for Figure 5 Middle BB cross-section.

[0039] Figure 7 It is a schematic diagram of the structure of the focusing seat.

[0040] Figure 8 Schematic diagram of the connection between the reflector housing and the off-axis parabolic reflector Figure 1 .

[0041] Fig. 9 Schematic diagram of the connection between the reflector housing and the off-axis parabolic reflector Figure 2 .

[0042] Fig.10 Figure 2 is a diagram of the relative positions of two off-axis parabolic reflectors.

[0043] Fig.11 Schematic diagram of the structure of the reflector housing Figure 1 .

[0044] Fig.12 Schematic diagram of the structure of the reflector housing Figure 2 .

[0045] Fig.13 Schematic diagram of the structure of the reflector housing Figure 3 . DETAILED DESCRIPTION

[0046] The specific embodiments of the present invention are further described below according to the accompanying drawings:

[0047] like Figure 1-6 As shown, first, the present invention discloses a device for converting a wide-spectrum laser light source into a tunable laser light source, comprising a wide-spectrum laser light source structure 1, an off-axis parabolic reflector 8, a reflector housing 2, a filter wheel 4, a motor 5 and a focus seat 3. The wide-spectrum laser light source structure 1 is mounted on a bottom plate. The wide-spectrum laser light source structure 1 is connected to a power source.

[0048] The reflector housing 2 is connected to the wide-spectrum laser light source structure 1 through screws and set screws.

[0049] like Figure 8-13 As shown, a notch 203 is provided in the middle of the reflector housing 2 and the notch 203 separates the reflector housing 2 into a left half housing 202 and a right half housing 201; an L-shaped left optical path channel 2021 is provided on the left half housing 202, and the off-axis parabolic reflector 8 is located in the left optical path channel 2021; an L-shaped right optical path channel 2011 is provided on the right half housing 201, and another off-axis parabolic reflector 8 is located in the right optical path channel 2011; the left optical path channel 2021 is connected to the right optical path channel 2011 through the notch 203, and the right optical path channel 2011 is connected to the light outlet of the wide-spectrum laser light source structure 1.

[0050] In this embodiment, the two off-axis parabolic reflectors 8 are fixedly connected to the left reflector seat 7 and the right reflector seat 6 respectively.

[0051] A left mounting hole 2022 is provided on the left half shell 202 of the reflector shell 2, and the left mounting hole 2022 is connected to the L-shaped left optical path channel 2021. The off-axis parabolic reflector 8 on the left reflector seat 7 extends from the left mounting hole 2022 into the left optical path channel 2021, and the left reflector seat 7 is connected to the left half shell 202 by screws and top screws.

[0052] A right mounting hole 2012 is provided on the right half shell 201 of the reflector shell 2, and the right mounting hole 2012 is connected to the L-shaped right optical path channel 2011. The off-axis parabolic reflector 8 on the right reflector seat 6 extends from the right mounting hole 2012 into the right optical path channel 2011, and the right reflector seat 6 is connected to the right half shell 201 by screws and top screws.

[0053] The motor 5 is connected to the reflector housing 2 through a motor mounting plate, and the output end of the motor 5 is connected to the center of the filter wheel 4. The filter wheel 4 is provided with a plurality of mounting holes 401 evenly and spaced apart in the circumferential direction. A color filter can be connected to each mounting hole 401. The color filter is used to transmit light of a specific wavelength. The color filter on a certain mounting hole 401 in the filter wheel 4 can be located in the notch 203 of the reflector housing 2. The motor 5 is connected to a power source. When the motor 5 is started, the motor 5 can drive the filter wheel 4 to rotate, thereby causing the plurality of color filters on the filter wheel 4 to rotate around the center of the filter wheel 4, thereby replacing the color filter located in the notch 203 of the reflector housing 2. To use a color filter, the color filter only needs to be rotated into the notch 203. The specific rotation angle of the motor 5 is controlled by using the existing technology and is controlled by an external controller. In order to obtain a more stable structure, the filter wheel 4 can also be rotatably supported on the reflector housing 2.

[0054] The left half shell 202 is connected with a focusing seat 3 , a light inlet of the focusing seat 3 is communicated with a left optical path channel 2021 on the left half shell 202 , and an optical fiber is connected inside the focusing seat 3 .

[0055] The wide-spectrum laser light source structure 1 is connected to a power source. After the wide-spectrum laser light source structure 1 emits light, the light enters the right optical path channel 2011 of the reflector housing 2 through the light outlet of the wide-spectrum laser light source structure 1, and is reflected by the off-axis parabolic reflector 8 in the right optical path channel 2011 to form a collimated light beam. The collimated light beam then passes through the color filter on the filter turntable 4 in the notch 203 of the reflector housing 2 and enters the left optical path channel 2021 of the reflector housing 2, and then is reflected by the off-axis parabolic reflector 8 in the left optical path channel 2021 and converges on the focus. The focus then converges on the optical fiber on the focusing seat 3, and the light beam is emitted from the optical fiber. The size of the color filter should be larger than the width of the collimated light beam emitted, so that the color filter can receive all the collimated light beams.

[0056] In this embodiment, the convergence point of the light beam emitted by the off-axis parabolic reflector 8 in the left optical path channel 2021 is at the same height as the light outlet of the wide-spectrum laser light source structure 1 .

[0057] In this embodiment, Figure 3-7 As shown, the focusing seat 3 includes a fiber focusing seat 301, a fiber centering seat 304, a pin 307, an SMA socket sleeve 305, an adjusting screw sleeve 303, and an SMA socket 306. The fiber focusing seat 301 is sleeved on the outer side of the fiber centering seat 304, and the two can slide relative to each other. The adjusting screw sleeve 303 is sleeved on the outer side of the fiber focusing seat 301. Pin holes are provided on the fiber centering seat 304 and the adjusting screw sleeve 303. A strip hole 3011 is provided on the fiber focusing seat 301. The pin 307 passes through the pin hole of the adjusting screw sleeve 303 and the strip hole 3011 on the fiber focusing seat 301 in sequence. The optical fiber focusing seat 301 is provided with a screw thread through hole, and the optical fiber focusing seat 301 is used to lock with the optical fiber centering seat 304 through the screw thread through hole and the screw, and the screw is used to tighten the optical fiber centering seat 304. The optical fiber centering seat 304 is connected with the SMA socket sleeve 305 through the screw, and the SMA socket sleeve 305 is connected with the SMA socket 306 through the screw. Specifically, one end face of the SMA socket sleeve 305 is provided with a groove, one end face of the SMA socket 306 is placed in the groove, and the SMA socket sleeve 305 and the SMA socket 306 are connected by screws. The SMA socket 306 is connected with the optical fiber through the optical fiber connector. After the optical fiber connector and the SMA socket 306 are matched and connected (such as threaded connection), the optical fiber end on the optical fiber connector is flush with the contact surface between the end face of the SMA socket 306 and the inner end face of the groove of the SMA socket sleeve 305.

[0058] Figure 6 The red structure in the figure is light 9, which is reflected by the off-axis parabolic reflector 8 in the left optical path channel 2021 and converged on the focus. The function of the focusing seat 3 is to make the focus converge on the optical fiber in the optical fiber connector on the focusing seat 3.

[0059] When adjusting the focusing seat 3, remove the SMA socket 306, loosen the top screw in the tightening threaded through hole on the optical fiber focusing seat 301, and then loosen the optical fiber centering seat 304, slide the adjustment screw sleeve 303, and the adjustment screw sleeve 303 drives the optical fiber centering seat 304 to move inside the optical fiber focusing seat 301 through the pin 307. At this time, the pin 307 moves in the strip hole 3011 on the optical fiber focusing seat 301. A thin paper is placed on the inner end face of the groove of the SMA socket sleeve 305, and the light source in the wide spectrum laser light source structure 1 is turned on. When the light converges on the thin paper and is the smallest and brightest, the focus of the light beam converges on the end face of the SMA socket sleeve 305, and is locked into the top screw threaded hole on the optical fiber focusing seat 301, and then the position of the optical fiber centering seat 304 is locked, and the SMA socket 306 is connected to the SMA socket sleeve 305 by screws. Since the end face of the SMA socket 306 contacts the inner end face of the groove of the SMA socket sleeve 305, the focus of the light beam converges to the end face of the SMA socket 306, and the optical fiber connector is installed in the SMA socket 306. After the optical fiber connector is installed, the end of the optical fiber in the optical fiber connector is flush with the end face of the SMA socket 306, and the focus of the light beam converges on the optical fiber. The method for judging whether the convergence point of the outgoing light beam of the off-axis parabolic reflector 8 converges on the optical fiber can also adopt other existing methods, not limited to the above method.

[0060] In this embodiment, a rubber ring 302 is further connected to the outer side of the adjusting screw sleeve 303 .

[0061] In this embodiment, the wide-spectrum laser light source structure 1 contains a wide-spectrum laser light source, which emits light from a light outlet.

[0062] The device is based on the original wide spectrum laser light source structure 1, and adds a reflector housing 2, a left reflector seat 7, a right reflector seat 6, a motor 5, a filter turntable 4, a focus seat 3, and an off-axis parabolic reflector 8 to realize the conversion of wide spectrum light into tunable light. The wavelength can be tuned by replacing the color filter. Different color filters have different wavelengths of light transmitted.

[0063] The assembly process of the device is as follows: first, the off-axis parabolic reflector 8 is fixed to the left reflector seat 7 and the right reflector seat 6 respectively, and then the left reflector seat 7 and the right reflector seat 6 are fixed to the reflector housing 2 by bolts respectively, and then the reflector housing 2 is connected to the housing of the wide-spectrum laser light source structure 1 by screws and screws, and then the motor 5 and the filter wheel 4 are installed together, and then the motor 5 is fixed to the reflector housing 2, and finally the focus seat 3 is installed behind the light outlet of the reflector housing 2. The optical fiber focus seat 301 of the focus seat 3 is connected to the light outlet of the reflector housing 2 by screws.

[0064] The device is implemented by adopting the principle of off-axis parabolic reflector 8. During the installation process, the distance from the center of the off-axis parabolic reflector 8 in the right half shell 201 of the reflector shell 2 to the light outlet of the wide-spectrum laser light source structure 1 can be obtained according to the focal length of the off-axis parabolic reflector 8. The structure and size of the reflector shell 2 are accurately designed to ensure that the height of the off-axis parabolic reflector 8 in the right half shell 201 of the reflector shell 2 and the light outlet of the wide-spectrum laser light source structure 1 are consistent, and the distance between the two is equal to the focal length of the off-axis parabolic reflector 8 on the right half shell 201, so that the off-axis parabolic reflector 8 on the right half shell 201 The reflected light beam is collimated. Observe from as far away as possible to see if the emitted light beam is consistent with the size, height and levelness at the nearby position. Since the dimensional accuracy and distance are guaranteed when the tooling is manufactured, the two basically do not need to be adjusted, so that the light beam reflected from the off-axis parabolic reflector 8 on the right half shell 201 can be guaranteed to be collimated. If it cannot be achieved by any means, it is necessary to use a top screw to fine-tune the inclination angle of the off-axis parabolic reflector 8 on the right half shell 201. After adjustment, tighten the right reflector seat 6 of the off-axis parabolic reflector 8 with screws to ensure that the light reflected by the off-axis parabolic reflector 8 on the right half shell 201 is a collimated light beam. Subsequently, the motor 5 and the filter wheel 4 are combined and installed in the device. The filter wheel 4 can be controlled to rotate by the motor 5 to replace the color filter, so that the light beam passes through the color filter and then hits the off-axis parabolic reflector 8 in the left half shell 202. After being reflected by the off-axis parabolic reflector 8 in the left half shell 202, the reflected light is converged at the focus. Under the condition of ensuring the accuracy of the tooling size, after assembling the various structures, it is possible to ensure that the height of the converged light beam is consistent with the light outlet of the wide-spectrum laser light source structure 1 without adjustment. If it cannot be achieved by chance, it can be fine-tuned by using the tolerance of the left reflector seat 7 and the reflector shell 2 to rotate the left reflector seat 7, thereby adjusting the convergence point of the light beam emitted by the off-axis parabolic reflector 8 in the left half shell 202 to be consistent with the height of the light outlet of the wide-spectrum laser light source structure 1. Finally, the focusing seat 3 is installed, and the optical fiber is inserted into the focusing seat 3. By adjusting the focusing seat 3, the focus of the light beam is converged on the optical fiber, and finally the light beam is emitted from the optical fiber, and the emission angle of the light beam from the optical fiber is ensured to be consistent with the emission angle of the laser.

[0065] Secondly, a tunable laser generation method is provided based on the above device, comprising the following steps:

[0066] Step 1. Fix two off-axis parabolic reflectors 8 on the left reflector seat 7 and the right reflector seat 6 respectively. The off-axis parabolic reflector 8 on the left reflector seat 7 extends from the left mounting hole 2022 on the reflector housing 2 into the left optical path channel 2021, and the left reflector seat 7 is connected to the left half shell 202 of the reflector housing 2 by screws and top screws; the off-axis parabolic reflector 8 on the right reflector seat 6 extends from the right mounting hole 2012 on the reflector housing 2 into the right optical path channel 2011, and the right reflector seat 6 is connected to the right half shell 201 of the reflector housing 2 by screws and top screws.

[0067] Step 2: A plurality of mounting holes 401 evenly and spaced apart are provided in the circumferential direction of the filter wheel 4, and color filters are inserted into the mounting holes 401. The output end of the motor 5 is connected to the central axis of the filter wheel 4 through a coupling, and then the motor 5 is connected to the reflector housing 2 through screws and jackscrews. One of the color filters on the filter wheel 4 is located between the two off-axis parabolic reflectors 8, that is, located in the notch 203 of the reflector housing 2; the color filter is used to transmit light of a specific wavelength;

[0068] Step 3, determine the wavelength of the desired output laser, and select the corresponding color filter on the filter wheel 4 according to the wavelength;

[0069] Step 4, rotating the filter wheel 4 until the color filter selected in step 3 is rotated between the two off-axis parabolic reflectors 8;

[0070] The step 4 is specifically as follows: the motor 5 is connected to a power source, the motor 5 is started, and the motor 5 drives the filter turntable 4 to rotate until the color filter selected in step 3 is rotated between the two off-axis parabolic reflectors 8, that is, into the notch 203 of the reflector housing 2; the motor 5 stops running.

[0071] Step 5, the wide-spectrum laser light source structure 1 emits laser, which is reflected by an off-axis parabolic reflector 8 to form a collimated light beam. The collimated light beam then passes through a color filter located between the two off-axis parabolic reflectors 8 and enters the second off-axis parabolic reflector 8 to be reflected and converged on a focal point. The focal point then converges on the optical fiber, and the laser is emitted from the optical fiber, thereby generating a laser of the required wavelength.

[0072] The step 5 is specifically as follows: the wide-spectrum laser light source structure 1 emits laser light, and the light enters the right optical path channel 2011 of the reflector housing 2 through the light outlet of the wide-spectrum laser light source structure 1, and is reflected by the off-axis parabolic reflector 8 in the right optical path channel 2011 to form a collimated light beam, and the collimated light beam then enters the left optical path channel 2021 of the reflector housing 2 after passing through the color filter in the notch 203 of the reflector housing 2 on the filter turntable 4, and then is reflected by the off-axis parabolic reflector 8 in the left optical path channel 2021 and converges on the focus, and the focus is then converged on the optical fiber in the focusing seat 3, and laser is emitted from the optical fiber, thereby generating laser light of the required wavelength.

[0073] The traditional method is to add a color filter after the optical fiber emits light, which often has certain limitations on the position of the color filter. The farther away from the optical fiber head, the larger the color filter required (the farther the color filter is from the optical fiber head, the more dispersed the light reaching the color filter after the optical fiber head emits light, so the larger the color filter required), and if the wavelength of the light needs to be changed, it may be necessary to replace the color filter by plugging and unplugging, which may affect the stability of the optical system. The laser light source in the wide-spectrum laser light source structure 1 of the present method is converted into a collimated beam through the first off-axis parabolic reflector 8, thereby extending the usable beam length. Therefore, the position of the color filter is no longer limited, and the same size of color filters can be used to place the color filters in different positions, that is, there is no need to replace color filters of different sizes according to the placement position of the color filters, and the color filters can be placed arbitrarily. Therefore, the position of the filter turntable 4 in the present method can be set arbitrarily, and there is no need to adjust the size of the color filter according to the position of the filter turntable 4.

[0074] The most critical device used in this method is the off-axis parabolic reflector 8, which is a surface reflector whose reflective surface is a portion intercepted from the parent parabola. The off-axis parabolic reflector 8 can be used to focus parallel light beams or collimated point light sources without dispersion, and its off-axis design can separate the focus from the light path. When the collimated light beam is incident vertically at the bottom of the reflector substrate, the reflected light will converge at the focus position. Placing a point light source at the focus can obtain a collimated light beam.

[0075] The light emitted by the laser light source in the wide-spectrum laser light source structure 1 is first transformed into a collimated light beam by the first off-axis parabolic reflector 8, thereby extending the usable light beam length, and then passes through the second off-axis parabolic reflector 8 to restore the light beam.

[0076] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A method for generating tunable laser, characterized in that: The following steps are involved: Step 1, a plurality of color filters are connected at intervals in the circumferential direction of the filter wheel; one of the color filters on the filter wheel is located between two off-axis parabolic reflectors, and the color filter is used to transmit light of a specific wavelength; Step 2, determine the wavelength of the desired output laser, and select the corresponding color filter on the filter wheel according to the wavelength; Step 3, rotate the filter wheel until the color filter selected in step 2 is rotated between the two off-axis parabolic reflectors; Step 4: The wide-spectrum laser light source structure emits laser light, which is reflected by an off-axis parabolic reflector to form a collimated light beam. The collimated light beam then passes through a color filter located between the two off-axis parabolic reflectors and enters a second off-axis parabolic reflector to be reflected and converged on a focal point. The focal point then converges on an optical fiber, and laser light is emitted from the optical fiber, thereby generating laser light of a desired wavelength.

2. The tunable laser generating method according to claim 1, characterized in that: Also include before step 1: Step 1a, installing two off-axis parabolic reflectors on the reflector housing respectively; A notch is provided in the middle of the reflector housing and the notch divides the reflector housing into a left half housing and a right half housing; an L-shaped left optical path channel is provided on the left half housing, and the off-axis parabolic reflector is installed in the left optical path channel; an L-shaped right optical path channel is provided on the right half housing, and another off-axis parabolic reflector is installed in the right optical path channel; the left optical path channel is connected with the right optical path channel through the notch; The reflector housing is connected to the wide-spectrum laser light source structure, wherein the right optical path channel of the reflector housing is communicated with the light outlet of the wide-spectrum laser light source structure.

3. The tunable laser generating method according to claim 2, characterized in that: The step 1 is specifically as follows: A plurality of mounting holes evenly and spaced apart are provided in the circumferential direction of the filter wheel, color filters are inserted into the mounting holes, the output end of the motor is connected to the center of the filter wheel, and the motor is then connected to the reflector housing, and one of the color filters on the filter wheel is located between the two off-axis parabolic reflectors, that is, located in the notch of the reflector housing; The step 3 is specifically as follows: The motor is connected to a power source, and the motor is started, and the motor drives the filter turntable to rotate until the color filter selected in step 2 is rotated between the two off-axis parabolic reflectors, that is, into the gap of the reflector housing; the motor stops running.

4. The tunable laser generating method according to claim 3, characterized in that: The step 4 is specifically as follows: The wide-spectrum laser light source structure emits laser, and the light enters the right optical path channel of the reflector housing through the light outlet of the wide-spectrum laser light source structure, and is reflected by the off-axis parabolic reflector in the right optical path channel to form a collimated light beam. The collimated light beam then enters the left optical path channel of the reflector housing after passing through the color filter in the notch of the reflector housing on the filter turntable, and is then reflected by the off-axis parabolic reflector in the left optical path channel and converged on a focus. The focus is then converged on the optical fiber in the focusing seat, and laser is emitted from the optical fiber, thereby generating laser of a required wavelength.

5. The tunable laser generating method according to claim 4, characterized in that: The left half shell is connected to a focusing seat, a light inlet of the focusing seat is communicated with a left optical path channel on the left half shell, and an optical fiber is connected inside the focusing seat.

6. The tunable laser generating method according to claim 2, characterized in that: The convergence point of the light beam emitted by the off-axis parabolic reflector in the left optical path channel is consistent with the height of the light outlet of the wide-spectrum laser light source structure.

7. The tunable laser generating method according to claim 2, characterized in that: The two off-axis parabolic reflectors are fixedly connected to the left reflector seat and the right reflector seat respectively; A left mounting hole is provided on the left half shell of the reflector housing, the left mounting hole is connected to the L-shaped left optical path channel, the off-axis parabolic reflector on the left reflector seat extends from the left mounting hole into the left optical path channel, and the left reflector seat is connected to the left half shell by screws and top screws; A right mounting hole is provided on the right half shell of the reflector shell, the right mounting hole is connected to the L-shaped right optical path channel, the off-axis parabolic reflector on the right reflector seat extends from the right mounting hole into the right optical path channel, and the right reflector seat is connected to the right half shell by screws and top screws.

8. The tunable laser generating method according to claim 3, characterized in that: The motor is connected to the reflector housing through a motor mounting plate.

9. The tunable laser generating method according to claim 5, characterized in that: The focusing seat comprises a fiber focusing seat, a fiber centering seat, a pin, an SMA socket sleeve, an adjusting screw sleeve, and an SMA socket. The fiber focusing seat sleeve is arranged on the outside of the fiber centering seat, and the adjusting screw sleeve is arranged on the outside of the fiber focusing seat. Pin holes are arranged on the fiber centering seat and the adjusting screw sleeve. A strip hole is opened on the fiber focusing seat. The pin passes through the pin hole of the adjusting screw sleeve, the strip hole on the fiber focusing seat, and the pin hole of the fiber centering seat in sequence. A tightening threaded through hole is also arranged on the fiber focusing seat. The fiber focusing seat is used to lock with the fiber centering seat through the tightening threaded through hole and the top screw. The fiber centering seat is connected to the SMA socket sleeve through the top screw, and the SMA socket sleeve is connected to the SMA socket through a screw.

10. The tunable laser generating method according to claim 9, characterized in that: The outer side of the adjusting screw sleeve is also connected with a rubber ring.

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