CN217385882U - Femtosecond laser pulse time sequence control system for preparing chirped fiber grating - Google Patents
Femtosecond laser pulse time sequence control system for preparing chirped fiber grating Download PDFInfo
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- CN217385882U CN217385882U CN202221244262.9U CN202221244262U CN217385882U CN 217385882 U CN217385882 U CN 217385882U CN 202221244262 U CN202221244262 U CN 202221244262U CN 217385882 U CN217385882 U CN 217385882U
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Abstract
The utility model discloses a femtosecond laser pulse time sequence control system for preparing chirped fiber grating, which comprises a femtosecond laser, a processing light path system, a control device and a displacement platform, wherein the processing light path system is arranged between the femtosecond laser and the displacement platform, and the control device is used for connecting and controlling the displacement platform; the laser processing system also comprises a time sequence signal device, wherein the control device is connected with and controls the time sequence signal device, and the time sequence signal device is connected with and controls the laser processing optical path system. The femtosecond laser pulse time sequence control system is used for preparing the chirped fiber grating based on femtosecond laser pulse time sequence control.
Description
Technical Field
The utility model relates to a fiber grating technical field especially relates to a preparation chirped fiber grating's femto second laser pulse time sequence control system.
Background
The existing preparation method of the chirped fiber grating mainly comprises an ultraviolet laser phase mask plate method and a femtosecond laser direct writing fiber grating.
Ultraviolet laser phase mask method (mass production method): and irradiating the phase mask plate by ultraviolet laser, and forming periodic refractive index modulation on the optical fiber by using interference fringes so as to prepare the optical fiber grating. The method is the most common chirped fiber grating mass production preparation method at present, but has the following defects: 1. the optical fiber has the requirement of photosensitivity, the optical fiber is often required to be loaded with hydrogen to increase the photosensitivity of the optical fiber, and the step of loading the optical fiber in a high-temperature and high-pressure hydrogen environment is required to be carried out, so that the time consumption is long and the danger is high; 2. the ultraviolet laser phase mask method has strict requirements on the distance, position and angle between the optical fiber and the mask plate, and has high requirements on the stability of the system in order to obtain high-quality fiber gratings with good repeatability; 3. the ultraviolet laser is expensive and has poor stability; 4. the phase mask plate can only prepare chirped fiber gratings with the same specification, and when the period of the grating needs to be changed or complicated fiber gratings need to be prepared, a new mask plate needs to be customized, so that the cost is high and the flexibility is poor.
Femtosecond laser direct writing fiber grating (new generation mainstream method): the optical fiber is fixed on the high-precision displacement platform, so that the position of a focused femtosecond laser spot is kept unchanged, and the displacement of the platform is utilized to realize the preparation of the optical fiber grating with high flexibility. The mode of directly writing the fiber grating by the femtosecond laser overcomes the inflexibility of the traditional ultraviolet laser phase mask plate method and the requirement on the photosensitivity of the optical fiber.
Chinese patent No. CN202120306978.6 discloses a chirped fiber grating preparation apparatus, which includes a laser processing optical path system, a control device, and a displacement platform; the control device is connected with the laser processing light path system and the displacement platform; the control device controls the laser processing light path system and the displacement platform to adjust the modulation amount of the chirped fiber grating at different positions.
When the chirped fiber grating is prepared by the preparation device, the fiber is driven to move by the displacement platform according to grating parameters, and laser pulses are synchronously triggered. In order to obtain high-quality chirped gratings, the moving speed of the displacement platform cannot be too high, and the preparation efficiency is low; meanwhile, the grating period of the chirped grating changes, for example, the grating period gradually increases or decreases from the grating start position to the grating end position, when the chirped grating is written by femtosecond laser, the displacement platform needs to drive the optical fiber to perform variable-speed motion according to the regular change of the grating period, acceleration control exists, the chirped grating is an extremely precise element, the grating period is in the micron or hundred nanometer level, and the variation of the grating period is usually in the picometer level, so the acceleration control in the preparation of the chirped grating needs extremely high precision, the existing displacement platform adopts an air floating platform, is limited by the motion precision of the air floating platform, cannot meet the requirements of the optical fiber on flexible quick start-stop and high-speed processing, cannot realize the chirping change of the grating period, and cannot meet the displacement tiny change of the chirped grating, so the prepared chirped grating period change is not continuous, it is difficult to obtain chirped fiber gratings with high quality spectra.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a femtosecond laser pulse time sequence control system which is used for preparing chirped fiber grating.
The utility model discloses the technical problem that will solve realizes through following technical scheme:
a femtosecond laser pulse time sequence control system for preparing chirped fiber gratings comprises a femtosecond laser, a processing optical path system, a control device and a displacement platform, wherein the processing optical path system is arranged between the femtosecond laser and the displacement platform, and the control device is connected with and controls the displacement platform; the laser processing system also comprises a time sequence signal device, wherein the control device is connected with and controls the time sequence signal device, and the time sequence signal device is connected with and controls the laser processing optical path system.
Further, the processing optical path system comprises an optical power attenuator, a dichroic mirror and a high power focusing objective lens which are sequentially arranged along the laser optical path.
Further, the optical power attenuator comprises a half-wave plate and a Glan prism which are oppositely arranged.
Further, the imaging device is arranged on one side, back to the high-power focusing objective lens, of the dichroic mirror.
Further, the imaging device is a CCD camera.
Further, the device also comprises a monitoring device, and the monitoring device is connected with the timing signal monitoring device.
Further, the monitoring device is an oscilloscope.
Further, the timing signal device is a high-speed signal generator.
Furthermore, two optical fiber clamps are arranged on the displacement platform and used for clamping two ends of the optical fiber respectively.
Further, the displacement platform is a three-dimensional displacement platform.
The utility model discloses following beneficial effect has: the femtosecond laser pulse time sequence control system controls the femtosecond laser to write on the optical fiber to form a chirped fiber grating with periodic variation by additionally arranging the time sequence signal device and utilizing a high-speed level signal generated by the time sequence signal device according to a time sequence, the displacement platform only needs to drive the optical fiber to do uniform motion, the grating period and the grating width of the chirped fiber grating are respectively determined by the interval duration and the output duration of the femtosecond laser pulse, the femtosecond laser is rapidly switched on and off by the high-speed level signal output by the time sequence signal device to replace complex motion variations of the displacement platform such as rapid start-stop, variable speed, variable acceleration and the like, the motion precision requirement on the displacement platform can be reduced, meanwhile, the femtosecond laser pulse can realize rapid pulse output, and the time sequence control precision is high, the processing precision of the chirped fiber grating is greatly improved.
Drawings
Fig. 1 is a schematic diagram of a femtosecond laser pulse time sequence control system provided by the present invention;
fig. 2 is a timing signal diagram of a timing signal device in the femtosecond laser pulse timing control system provided by the utility model;
fig. 3 is a schematic diagram of a chirped fiber grating prepared by the femtosecond laser pulse time sequence control system provided by the utility model.
Detailed Description
The invention is described in detail below with reference to the drawings, wherein examples of the embodiments are shown in the drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be interconnected between two elements or may be in an interactive relationship between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example one
As shown in fig. 1, a femtosecond laser pulse time sequence control system for preparing chirped fiber gratings comprises a femtosecond laser 1, a processing optical path system, a control device 7 and a displacement platform 6, wherein the processing optical path system is arranged between the femtosecond laser 1 and the displacement platform 6, and the control device 7 is connected with and controls the displacement platform 6; the laser processing device is characterized by further comprising a time sequence signal device 9, the control device 7 is connected with and controls the time sequence signal device 9, and the time sequence signal device 9 is connected with and controls the laser processing optical path system.
When the femtosecond laser pulse time sequence control system prepares the chirped fiber grating, the control device 7 controls the time sequence signal device 9 to generate and send a corresponding high-speed level signal to the femtosecond laser 1 according to the grating period and the grating width of the chirped fiber grating, the femtosecond laser 1 is in a high level state when receiving the high-speed level signal, is excited to output a femtosecond laser pulse corresponding to the high-speed level signal, the femtosecond laser pulse is processed by the processing optical path system and acts on an optical fiber carried on the displacement platform 6, the local part of the optical fiber is subjected to refractive index modulation to obtain the chirped fiber grating, the femtosecond laser 1 is in a low level state when the high-speed level signal is not received, and the femtosecond laser pulse is not output; meanwhile, the control device 7 controls the displacement platform 6 to drive the optical fiber to move, so that each modulation position on the optical fiber is sequentially aligned with the focusing position of the femtosecond laser pulse.
The femtosecond laser pulse time sequence control system controls the femtosecond laser device 1 to write on the optical fiber to form a chirped fiber grating with period change by additionally arranging the time sequence signal device 9 and utilizing a high-speed level signal generated by the time sequence signal device 9 according to a time sequence, the displacement platform 6 only needs to drive the optical fiber to move at a constant speed, the grating period and the grating width of the chirped fiber grating are respectively determined by the interval duration and the output duration of the femtosecond laser pulse, the femtosecond laser device 1 is rapidly switched on and off by the high-speed level signal output by the time sequence signal device 9 to replace complex motion changes of rapid start-stop, variable speed, variable acceleration and the like of the displacement platform 6, the motion precision requirement on the displacement platform 6 can be reduced, and meanwhile, the femtosecond laser pulse can realize rapid pulse output, the time sequence control precision is high, and the processing precision of the chirped fiber grating is greatly improved.
Of course, if the grating period or grating width of the chirped fiber grating changes more complicatedly, the displacement platform 6 can still drive the optical fiber to perform variable speed motion, and at this time, the motion parameters further include the acceleration of the optical fiber moving along the self axial direction and the like, and then the motion parameters are matched with the femtosecond laser pulse modulated by the time sequence, so that the requirement on the motion precision of the displacement platform 6 during the preparation of the chirped fiber grating can still be reduced.
When the chirped fiber grating is prepared, the control device 7 calculates and generates a time sequence signal diagram of the time sequence signal device 9 according to the grating period and the grating width of the chirped fiber grating, and then controls the interval duration and the output duration of the high-speed level signal output by the time sequence signal device 9 according to the generated time sequence signal diagram, the interval duration of the high-speed level signal output by the time sequence signal device 9 corresponds to the grating period of the chirped fiber grating, and the output duration of the high-speed level signal output by the time sequence signal device 9 corresponds to the grating width of the chirped fiber grating.
The grating period Λ of the chirped fiber grating and the movement speed v of the displacement platform 6 satisfy Λ = v × t, t is an interval duration between two adjacent high-speed level signals output by the time sequence signal device 9 (i.e., a duration of each shutdown of the femtosecond laser 1); d = v × T is satisfied between the grating width d of the chirped fiber grating and the movement speed v of the displacement platform 6, where T is an output duration of each high-speed level signal output by the timing signal device 9 (i.e., a duration of each turn-on of the femtosecond laser 1).
Wherein, as shown in fig. 2 and 3, the timing signal diagram of the timing signal device is related to the grating period (the spacing Λ 1, Λ 2, Λ 3, Λ 4, Λ 5, Λ 6 between two adjacent modulation positions) and the grating width (the width d1, d2, d3, d4, d5, d6 of the chirped fiber grating).
The distance between two adjacent modulation positions on the chirped fiber grating, namely the period of the chirped fiber grating is changed, namely the distance between any two adjacent modulation positions is different and corresponds to the shutdown duration of each femtosecond laser pulse; the width of the modulation position on the chirped fiber grating, that is, the grating width of the chirped fiber grating may be uniform or may be variable, that is, the width of each modulation position on the chirped fiber grating may be the same or different, and corresponds to the turn-on duration of each femtosecond laser pulse.
Λ 1, Λ 2, Λ 3, Λ 4, Λ 5, Λ 6 in fig. 2 correspond to the low level state of each 0V in fig. 3, respectively, and d1, d2, d3, d4, d5, d6 in fig. 2 correspond to the high level state of each 1V in fig. 3, respectively.
In this embodiment, the timing signal device 9 is a high-speed signal generator, and the control device 7 is a personal computer, a central control host, a mobile terminal, or the like.
The processing light path system comprises a light power attenuator 2, a dichroic mirror 3 and a high-power focusing objective lens 5 which are sequentially arranged along a laser light path.
The femtosecond laser 1 is started and continuously emits femtosecond laser pulses when receiving the high-speed level signal of the time sequence signal device 9, and is closed and stopped emitting the femtosecond laser pulses when not receiving the high-speed level signal of the time sequence signal device 9; the femtosecond laser pulse emitted by the femtosecond laser 1 is attenuated to proper power by the optical power attenuator 2, the dichroic mirror 3 reflects the attenuated femtosecond laser pulse into the high-power focusing objective lens 5, and the high-power focusing objective lens 5 focuses the femtosecond laser pulse and then irradiates the femtosecond laser pulse on the optical fiber of the displacement platform 6, so as to modulate the refractive index of the optical fiber to form the chirped fiber grating.
The optical power attenuator 2 comprises a half-wave plate and a Glan prism which are oppositely arranged, the half-wave plate which can be precisely rotated is matched with the Glan prism, the passing proportion of the femtosecond laser pulse is selected according to different polarization states, and then the power of the femtosecond laser pulse is adjusted.
The femtosecond laser pulse time sequence control system also comprises an imaging device 4, wherein the imaging device 4 is arranged on one side of the dichroic mirror 3, which is back to the high-power focusing objective lens 5.
The imaging device 4 images the optical fiber through the dichroic mirror 3 under the illumination of background light, so that the visualization of the modulation path of the femtosecond laser pulse is realized.
In this embodiment, the imaging device 4 is a CCD camera.
Preferably, the displacement platform 6 is a three-dimensional displacement platform, and is configured to drive the optical fiber to perform three-dimensional movement along three perpendicular axial directions when the chirped fiber grating is prepared.
Example two
As an optimization scheme of the first embodiment, as shown in fig. 1, the femtosecond laser pulse timing control system in this embodiment further includes a monitoring device 8, and the monitoring device 8 is connected to the timing signal monitoring device 9.
The monitoring device 8 monitors the working state of the timing signal device 9 by acquiring and displaying the high-speed level signal output by the timing signal device 9.
In this embodiment, the monitoring device 8 is an oscilloscope.
EXAMPLE III
As an optimized solution of the first embodiment or the second embodiment, the displacement platform 6 in this embodiment is provided with two optical fiber clamps, and the two optical fiber clamps are used for respectively clamping two ends of the optical fiber.
It should be finally noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced with equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A femtosecond laser pulse time sequence control system for preparing chirped fiber grating comprises a femtosecond laser, a processing light path system, a control device and a displacement platform, wherein the processing light path system is arranged between the femtosecond laser and the displacement platform, and the control device is connected with and controls the displacement platform; the device is characterized by further comprising a time sequence signal device, wherein the control device is connected with and controls the time sequence signal device, and the time sequence signal device is connected with and controls the processing optical path system.
2. The femtosecond laser pulse time sequence control system for preparing the chirped fiber grating according to claim 1, wherein the processing optical path system comprises an optical power attenuator, a dichroic mirror and a high-power focusing objective lens which are sequentially arranged along a laser optical path.
3. The femtosecond laser pulse timing control system for preparing the chirped fiber grating according to claim 2, wherein the optical power attenuator comprises a half-wave plate and a Glan prism which are oppositely arranged.
4. The femtosecond laser pulse time sequence control system for preparing the chirped fiber grating according to claim 2, further comprising an imaging device, wherein the imaging device is arranged on one side of the dichroic mirror, which faces away from the high-power focusing objective lens.
5. The femtosecond laser pulse timing control system for manufacturing chirped fiber gratings according to claim 4, wherein the imaging device is a CCD camera.
6. The femtosecond laser pulse time sequence control system for preparing the chirped fiber grating according to claim 1, further comprising a monitoring device, wherein the monitoring device is connected with the time sequence signal monitoring device.
7. The femtosecond laser pulse time sequence control system for preparing chirped fiber gratings according to claim 6, wherein the monitoring device is an oscilloscope.
8. The femtosecond laser pulse timing control system for preparing the chirped fiber grating according to claim 1, wherein the timing signal device is a high-speed signal generator.
9. The femtosecond laser pulse time sequence control system for preparing the chirped fiber grating according to claim 1, wherein two fiber clamps are arranged on the displacement platform, and the two fiber clamps are used for respectively clamping two ends of an optical fiber.
10. The femtosecond laser pulse timing control system for preparing the chirped fiber grating according to claim 1 or 9, wherein the displacement platform is a three-dimensional displacement platform.
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| CN202221244262.9U CN217385882U (en) | 2022-05-23 | 2022-05-23 | Femtosecond laser pulse time sequence control system for preparing chirped fiber grating |
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| CN202221244262.9U CN217385882U (en) | 2022-05-23 | 2022-05-23 | Femtosecond laser pulse time sequence control system for preparing chirped fiber grating |
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