CN116009330A - All-fiber optical modulation device and all-fiber optical modulation method for suppressing gain narrowing - Google Patents
All-fiber optical modulation device and all-fiber optical modulation method for suppressing gain narrowing Download PDFInfo
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- CN116009330A CN116009330A CN202211521151.2A CN202211521151A CN116009330A CN 116009330 A CN116009330 A CN 116009330A CN 202211521151 A CN202211521151 A CN 202211521151A CN 116009330 A CN116009330 A CN 116009330A
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Abstract
The application provides an all-fiber optical modulation device and an all-fiber optical modulation method for inhibiting gain narrowing, and belongs to the technical field of femtosecond laser. The all-fiber optical modulation device includes: the optical fiber circulator is provided with a first port, a second port and a third port, and the first port is used for acquiring the femtosecond seed laser input from the outside; the chirped fiber grating is connected with a second port of the fiber circulator through an optical fiber and is used for carrying out pulse width broadening treatment on the femtosecond seed laser so as to obtain pulse width broadening laser; the modulation fiber grating is connected with a third port of the fiber circulator through an optical fiber and is used for modulating the spectral transmittance of the pulse width broadening laser so as to output spectrum modulation laser. The all-fiber optical modulation device can perform laser modulation without coupling the femtosecond seed laser into the space, and the modulation structure of the femtosecond seed laser is simplified.
Description
Technical Field
The present application relates to the field of femtosecond laser technology, and in particular, to an all-fiber optical modulation device and an all-fiber optical modulation method for suppressing gain narrowing.
Background
With the development of industrial femtosecond lasers and the increase of required energy, the whole laser system is gradually developed towards the multi-stage amplification direction. With the increase of amplification level, gain narrowing effect caused by uneven gain of gain medium in the laser amplification system is more obvious, so that spectrum narrowing is more serious, the compressed limit laser pulse width is increased, the laser pulse peak power is reduced, and the laser processing effect and thermal diffusion in the laser processing process are seriously affected. In the related art, seed laser is subjected to spectrum modulation by means of liquid crystal spatial light modulation, dielectric layer filtering and the like so as to inhibit gain narrowing effect in the subsequent laser amplification process. However, the above-mentioned methods for performing spectral modulation on the seed laser all require that the seed laser is coupled to space for performing spectral modulation, and then the laser is coupled to an optical fiber for transmission, and the related modulation structure is relatively complex.
Disclosure of Invention
The main purpose of the embodiments of the present application is to provide an all-fiber optical modulation device and an all-fiber optical modulation method for suppressing gain narrowing, which aims to simplify the spectrum modulation structure of femtosecond seed laser.
To achieve the above object, a first aspect of an embodiment of the present application provides an all-fiber optical modulation device, including:
the optical fiber circulator (100), wherein the optical fiber circulator (100) is provided with a first port (110), a second port (120) and a third port (130), and the first port (110) is used for acquiring femtosecond seed laser input from the outside;
a chirped fiber grating (200), the chirped fiber grating (200) is connected with the second port (120) of the fiber circulator (100) through an optical fiber, the fiber circulator (100) is further configured to transmit the femtosecond seed laser from the second port (120) to the chirped fiber grating (200) through an optical fiber, the chirped fiber grating (200) is configured to perform pulse width broadening processing on the femtosecond seed laser to obtain pulse width broadening laser, and send the pulse width broadening laser to the second port (120) through an optical fiber; wherein, the chirped fiber grating (200) is a reflective chirped fiber grating with a pulse width widening function;
a modulated fiber grating (300), the modulated fiber grating (300) being connected to the third port (130) of the fiber circulator (100) by an optical fiber, the fiber circulator (100) further being configured to receive the pulse width expanded laser light through the second port (120) and transmit the pulse width expanded laser light from the third port (130) to the modulated fiber grating (300) by an optical fiber, the modulated fiber grating (300) being configured to modulate a spectral transmittance of the pulse width expanded laser light to output a spectrally modulated laser light; the modulation fiber grating (300) is a transmission fiber grating with a spectrum modulation function.
In some embodiments, the all-fiber light modulation device further comprises:
the optical fiber grating device comprises a spectrum adjustment controller (400), wherein the spectrum adjustment controller (400) is respectively connected with the chirped fiber grating (200) and the modulated fiber grating (300), and the spectrum adjustment controller (400) is used for adjusting the grating area periodic structure of the chirped fiber grating (200) and/or the modulated fiber grating (300).
In some embodiments, the spectrum adjustment controller (400) includes an electronic control unit (410), a first temperature control unit (420) and a second temperature control unit (430), the electronic control unit (410) is respectively connected to the first temperature control unit (420) and the second temperature control unit (430), the first temperature control unit (420) is used for adjusting a grating region temperature of the chirped fiber grating (200) to change a grating periodic structure of the chirped fiber grating (200), the second temperature control unit (430) is used for adjusting a grating region temperature of the modulated fiber grating (300) to change a grating periodic structure of the modulated fiber grating (300), and the electronic control unit (410) is used for sending temperature control instructions to the first temperature control unit (420) and the second temperature control unit (430).
In some embodiments, the reflective chirped fiber grating is a chirped fiber bragg grating.
In some embodiments, the chirped fiber bragg grating is a single positive dispersion chirped fiber bragg grating.
In some embodiments, the chirped fiber bragg grating is provided with a distributed temperature regulator.
In some embodiments, the transmissive fiber grating comprises at least one of: bragg fiber gratings, tilted fiber gratings, and long period fiber gratings.
To achieve the above object, a second aspect of the present application proposes an all-fiber optical modulation method, including:
acquiring an externally input femtosecond seed laser;
performing pulse width broadening treatment on the femtosecond seed laser through a chirped fiber grating to obtain pulse width broadening laser;
and modulating the spectral transmittance of the pulse width spread laser by modulating the fiber bragg grating to obtain the spectral modulated laser.
In some embodiments, before the step of obtaining the externally input femtosecond seed laser, the method further includes:
performing spectrum calculation according to the target femtosecond laser to obtain target modulated laser;
and adjusting the chirped fiber grating and/or the grating area periodic structure of the modulated fiber grating according to the target modulated laser.
According to the all-fiber optical modulation device and the all-fiber optical modulation method for inhibiting gain narrowing, the spectrum modulation laser is obtained by carrying out pulse width widening treatment and spectrum transmittance modulation on the femtosecond seed laser in the optical fiber, so that the gain narrowing effect in the subsequent laser amplification process of the spectrum modulation laser is inhibited, the femtosecond seed laser is not required to be coupled into space, and the modulation structure of the femtosecond seed laser is simplified.
Drawings
Fig. 1 is a block diagram of an all-fiber optical modulation device provided in an embodiment of the present application;
FIG. 2 is a block diagram of an all-fiber optical modulation device provided in another embodiment of the present application;
FIG. 3 is a spectral diagram of a femtosecond seed laser input by an embodiment of the present application;
FIG. 4 is a spectral diagram of an ideal laser according to an embodiment of the present application;
FIG. 5 is a reflection spectrum of a chirped fiber grating according to an embodiment of the present application;
FIG. 6 is a graph of the transmission spectrum of a modulated fiber grating according to an embodiment of the present application;
FIG. 7 is a schematic diagram of the spectral integrated transmittance of an all-fiber optical modulation device according to an embodiment of the present application;
FIG. 8 is a spectral diagram of a spectrally modulated laser light output by an all-fiber light modulation device according to an embodiment of the present application;
FIG. 9 is a block diagram of an all-fiber optical modulation device provided in another embodiment of the present application;
FIG. 10 is a graph of the transmission spectrum of a first transmission grating according to an embodiment of the present application;
FIG. 11 is a spectral diagram of a second transmission grating according to an embodiment of the present application;
FIG. 12 is a schematic diagram of the spectral integrated transmittance of an all-fiber optical modulation device according to another embodiment of the present application;
FIG. 13 is a spectral diagram of a spectrally modulated laser light output by an all-fiber light modulation device according to another embodiment of the present application;
FIG. 14 is a flowchart of an all-fiber optical modulation method provided by an embodiment of the present application;
fig. 15 is a flow chart of an all-fiber optical modulation method according to another embodiment of the present application.
Reference numerals:
the optical fiber circulator 100, the chirped fiber grating 200, the modulated fiber grating 300 and the spectrum adjustment controller 400;
a first port 110, a second port 120, a third port 130;
an electric control unit 410, a first temperature control unit 420, and a second temperature control unit 430;
a first transmission grating 310, a second transmission grating 320.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be noted that although functional block division is performed in a device diagram and a logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The all-fiber optical modulation device can be applied to a femtosecond laser amplification system based on an optical fiber chirped pulse amplification technology. The femtosecond laser has extremely high peak power and extremely short continuous time, and is used for wide application prospect in the fields of computers, communication, consumer electronics, additive manufacturing, accurate medical treatment, micro-nano processing, ultra-fast detection and the like. The optical fiber chirped pulse amplification technology becomes a mainstream scheme of industrial-grade femtosecond laser amplification due to the advantages of low cost, stable structure and the like. With the development of industrial femtosecond lasers and the increase of required energy, the whole laser system is gradually developed towards the multi-stage amplification direction. With the increase of amplification level, gain narrowing effect caused by uneven gain of gain medium in the laser amplification system is more obvious, so that spectrum narrowing is more serious, the compressed limit laser pulse width is increased, the laser pulse peak power is reduced, and the laser processing effect and thermal diffusion in the laser processing process are seriously affected. In the related art, seed laser is subjected to spectrum modulation by means of liquid crystal spatial light modulation, dielectric layer filtering and the like so as to inhibit gain narrowing effect in the subsequent laser amplification process. However, the above-mentioned methods for performing spectral modulation on the seed laser all require that the seed laser is coupled to space for performing spectral modulation, and then the laser is coupled to an optical fiber for transmission, and the related modulation structure is relatively complex.
Based on this, the present application proposes an all-fiber optical modulation device and an all-fiber optical modulation method that suppress gain narrowing, aiming at simplifying the spectrum modulation structure of the femtosecond seed laser.
Referring to fig. 1, an all-fiber optical modulation device according to an embodiment of the present application includes:
the optical fiber circulator 100, the optical fiber circulator 100 is provided with a first port 110, a second port 120 and a third port 130, and the first port 110 is used for acquiring the femtosecond seed laser input from the outside;
the chirped fiber grating 200, the chirped fiber grating 200 is connected with the second port 120 of the fiber circulator 100 through an optical fiber, the fiber circulator 100 is further used for transmitting the femtosecond seed laser from the second port 120 to the chirped fiber grating 200 through the optical fiber, the chirped fiber grating 200 is used for performing pulse width broadening treatment on the femtosecond seed laser to obtain pulse width broadening laser, and the pulse width broadening laser is sent to the second port 120 through the optical fiber; the chirped fiber grating 200 is a reflective chirped fiber grating with a pulse width widening function;
the modulation fiber grating 300 is connected with the third port 130 of the fiber circulator 100 through an optical fiber, the fiber circulator 100 is further used for receiving the pulse width broadening laser through the second port 120 and transmitting the pulse width broadening laser from the third port 130 to the modulation fiber grating 300 through the optical fiber, and the modulation fiber grating 300 is used for modulating the spectral transmittance of the pulse width broadening laser to output spectrum modulation laser; the modulated fiber grating 300 is a transmission fiber grating having a spectrum modulation function.
In the all-fiber optical modulation device of the embodiment of the application, laser is always transmitted in an optical fiber. The reflective chirped fiber grating can widen the pulse width of the input femtosecond seed laser so as to reduce the peak power of the laser. The transmission fiber bragg grating can modulate the transmittance of light waves with specific wavelengths in the laser spectrum, and the light waves with specific wavelengths are not lost. The spectrum modulation laser is obtained by carrying out pulse width broadening treatment and spectrum transmittance modulation on the femtosecond seed laser in the optical fiber, so that gain narrowing effect in the subsequent laser amplification process of the spectrum modulation laser is restrained, the femtosecond seed laser is not required to be coupled into space, and the modulation structure of the femtosecond seed laser is simplified.
In some embodiments, referring to fig. 2, the all-fiber optical modulation device further comprises:
and the spectrum adjustment controller 400 is respectively connected with the chirped fiber grating 200 and the modulated fiber grating 300, and the spectrum adjustment controller 400 is used for adjusting the grating area periodic structure of the chirped fiber grating 200 and/or the modulated fiber grating 300. The spectrum adjustment controller 400 adjusts the reflection spectrum, the transmission spectrum and the dispersion value of the laser by adjusting the chirped fiber grating 200 and/or modulating the grating area periodic structure of the fiber grating 300, thereby achieving the best gain narrowing inhibition effect and improving the laser quality obtained by subsequent laser amplification and laser compression.
In some embodiments, referring to fig. 2, the spectrum adjustment controller 400 includes an electric control unit 410, a first temperature control unit 420 and a second temperature control unit 430, where the electric control unit 410 is respectively connected to the first temperature control unit 420 and the second temperature control unit 430, the first temperature control unit 420 is used for adjusting the temperature of the grating region of the chirped fiber grating 200 to change the grating periodic structure of the chirped fiber grating 200, and the second temperature control unit 430 is used for adjusting the temperature of the grating region of the modulated fiber grating 300 to change the grating periodic structure of the modulated fiber grating 300. The electronic control unit 410 is configured to send temperature control instructions to the first temperature control unit 420 and the second temperature control unit 430.
In some embodiments, the reflective chirped fiber grating is a chirped fiber bragg grating. The chirped fiber Bragg grating is a fiber grating with a special structure and is characterized in that the period of the grating is not constant but gradually changes along the axial length.
In some embodiments, the chirped fiber bragg grating is a single positive dispersion chirped fiber bragg grating. In other embodiments, the chirped fiber bragg grating may also be provided with a distributed temperature regulator. The reflective chirped fiber bragg grating can select to use an independent positive dispersion chirped fiber bragg grating or a chirped fiber bragg grating with a distributed temperature regulator according to practical application requirements.
In some embodiments, transmissive fiber gratings include, but are not limited to including, at least one of: bragg fiber gratings, tilted fiber gratings, and long period fiber gratings. The Bragg fiber grating, the inclined fiber grating and the long-period fiber grating are all grating devices with specific spectral transmission characteristics, and one or more of the Bragg fiber grating, the inclined fiber grating and the long-period fiber grating are selected according to practical application requirements. In other embodiments, other grating devices having specific spectral transmission characteristics may be used with the transmissive fiber grating.
In an exemplary embodiment, the all-fiber optical modulation device of the embodiment of the present application can be applied to the case of small signal gain, please refer to fig. 2, 3, 4, 5, 6, 7 and 8, fig. 3 is a spectrum diagram of a femtosecond seed laser, the center wavelength of the femtosecond seed laser is 1033.07nm, and the spectrum bandwidth is 17nm. Fig. 4 is a spectrum of an ideal laser light of an input amplification system (i.e., output from the all-ray light modulation device of the present application) calculated from a femtosecond seed laser. In this embodiment, the optical fiber may be a Fujikura SM98-PS-U25D transmission optical fiber, and the chirped fiber bragg grating is a chirped fiber bragg grating based on the Fujikura SM98-PS-U25D transmission optical fiber. FIG. 5 is a reflection spectrum of a chirped fiber grating having a center wavelength of 1033nm, a bandwidth of 18nm, a reflectance of 20%, and a dispersion of 60ps/nm. The laser light after pulse width stretching is transmitted to the modulated fiber grating 300 via the fiber circulator 100. Fig. 6 is a transmission spectrum diagram of a modulated fiber grating 300, the modulated fiber grating 300 being a broadband bragg fiber grating based on Fujikura SM98-PS-U25D transmission fiber, which does not provide transmission dispersion, and the light wave transmittance around a wavelength of 1033nm can be modulated as needed. According to the spectrum diagram of the ideal laser light shown in fig. 4, the control electronic unit 410 outputs a temperature control command to the second temperature control unit 430 to adjust the temperature of the grating region of the modulated fiber grating 300, thereby adjusting the spectral transmittance of the modulated fiber grating 300. The spectrum comprehensive transmittance of the all-fiber optical modulation device of this embodiment is shown in fig. 7, and at this time, the modulation of the input femtosecond seed laser by the all-fiber optical modulation device is represented by a dispersion value of 60ps/nm, and the pulse width after widening is not more than 1nm. The spectrum of the spectrum modulated laser output by the all-fiber optical modulation device of the embodiment is shown in fig. 8, and it can be seen that the spectrum of the spectrum modulated laser output by the all-fiber optical modulation device of the embodiment has high consistency with the ideal laser spectrum, so that the excellent effect of subsequent laser amplification can be ensured.
In one embodiment, the all-fiber optical modulation device of the embodiment of the present application may be further applied to the case of high power gain, referring to fig. 3, fig. 4, fig. 5, fig. 9, fig. 10, fig. 11, fig. 12 and fig. 13, fig. 3 is a spectrum diagram of a femtosecond seed laser, where the center wavelength of the femtosecond seed laser is 1033.07nm, and the spectral bandwidth is 17nm. Fig. 4 is an ideal laser spectrum of the input amplification system calculated from the femtosecond seed laser. In this embodiment, the optical fiber may be a Fujikura SM98-PS-U25D transmission optical fiber, and the chirped fiber bragg grating is a chirped fiber bragg grating based on the Fujikura SM98-PS-U25D transmission optical fiber. FIG. 5 is a reflection spectrum of a chirped fiber grating having a center wavelength of 1033nm, a bandwidth of 18nm, a reflectance of 20%, and a dispersion of 60ps/nm. The laser light after pulse width stretching is transmitted to the modulated fiber grating 300 via the fiber circulator 100. As shown in fig. 9, the all-fiber optical modulation device of the present embodiment has a structure in which a modulated fiber grating 300 includes two types of transmission gratings: a first transmission grating 310 and a second transmission grating 320, the transmission spectrum of the first transmission grating 310 is shown in fig. 10, and the spectrum of the second transmission grating 320 is shown in fig. 11. The spectrum comprehensive transmittance of the all-fiber optical modulation device of this embodiment is shown in fig. 12, and at this time, the modulation of the input femtosecond seed laser by the all-fiber optical modulation device is represented by a dispersion value of 60ps/nm, and the pulse width after widening is not more than 1nm. The spectrum of the spectrum modulated laser light output from the all-fiber optical modulation device of this embodiment is shown in fig. 13. It can be seen that the spectrum of the spectrum modulation laser output by the all-fiber optical modulation device of the embodiment has higher consistency with the ideal laser spectrum, so that the subsequent laser amplification effect can be ensured to be good.
Referring to fig. 14, the all-fiber optical modulation method of the present application is applied to the all-fiber optical modulation device of any of the above embodiments, and includes, but is not limited to, steps S101 to S103:
step S101, obtaining an externally input femtosecond seed laser;
step S102, performing pulse width broadening treatment on femtosecond seed laser through a chirped fiber grating to obtain pulse width broadening laser;
step S103, modulating the spectral transmittance of the pulse width widening laser by modulating the fiber bragg grating to obtain the spectral modulated laser.
In the steps S101 to S103 illustrated in the embodiments of the present application, the spectrum modulated laser is obtained by performing pulse width broadening treatment and spectrum transmittance modulation on the femtosecond seed laser in the optical fiber, so as to inhibit the gain narrowing effect in the subsequent laser amplification process of the spectrum modulated laser, without coupling the femtosecond seed laser into space, and simplify the modulation structure of the femtosecond seed laser.
In some embodiments, referring to fig. 15, before step S101, the all-fiber optical modulation method of the present application further includes:
step S201, performing spectrum calculation according to target femtosecond laser to obtain target modulated laser;
step S202, the chirped fiber grating and/or the grating area periodic structure of the modulated fiber grating is adjusted according to the target modulated laser.
In step S201 of some embodiments, the target femtosecond laser is a laser that is expected to be obtained after being amplified by the amplifying system, and the target modulated laser is a spectrum modulated laser in an ideal case. The relation between the target femtosecond laser and the target modulated laser is as follows:
wherein F is out Is the luminous flux of the target femtosecond laser, F sat Represents the saturation flux of the amplifying gain medium, F sto Represents the energy storage flux of pump light, F in Indicating the luminous flux of the target modulated laser light.
In step S202 of some embodiments, the chirped fiber grating and/or the grating area periodic structure of the modulated fiber grating is adjusted according to the target modulated laser, so that the output spectrum modulated laser and the target modulated laser are consistent as much as possible, so as to improve the gain narrowing suppression effect.
The embodiments described in the embodiments of the present application are for more clearly describing the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application, and as those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
It will be appreciated by those skilled in the art that the technical solutions shown in the figures do not constitute limitations of the embodiments of the present application, and may include more or fewer steps than shown, or may combine certain steps, or different steps.
Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other forms.
The embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the present application and features of the embodiments may be combined with each other without conflict.
Claims (9)
1. An all-fiber optical modulation device, comprising:
the optical fiber circulator (100), wherein the optical fiber circulator (100) is provided with a first port (110), a second port (120) and a third port (130), and the first port (110) is used for acquiring femtosecond seed laser input from the outside;
a chirped fiber grating (200), the chirped fiber grating (200) is connected with the second port (120) of the fiber circulator (100) through an optical fiber, the fiber circulator (100) is further configured to transmit the femtosecond seed laser from the second port (120) to the chirped fiber grating (200) through an optical fiber, the chirped fiber grating (200) is configured to perform pulse width broadening processing on the femtosecond seed laser to obtain pulse width broadening laser, and send the pulse width broadening laser to the second port (120) through an optical fiber; wherein, the chirped fiber grating (200) is a reflective chirped fiber grating with a pulse width widening function;
a modulated fiber grating (300), the modulated fiber grating (300) being connected to the third port (130) of the fiber circulator (100) by an optical fiber, the fiber circulator (100) further being configured to receive the pulse width expanded laser light through the second port (120) and transmit the pulse width expanded laser light from the third port (130) to the modulated fiber grating (300) by an optical fiber, the modulated fiber grating (300) being configured to modulate a spectral transmittance of the pulse width expanded laser light to output a spectrally modulated laser light; the modulation fiber grating (300) is a transmission fiber grating with a spectrum modulation function.
2. The all-fiber optical modulation device according to claim 1, further comprising:
the optical fiber grating device comprises a spectrum adjustment controller (400), wherein the spectrum adjustment controller (400) is respectively connected with the chirped fiber grating (200) and the modulated fiber grating (300), and the spectrum adjustment controller (400) is used for adjusting the grating area periodic structure of the chirped fiber grating (200) and/or the modulated fiber grating (300).
3. The all-fiber optical modulation device according to claim 2, wherein the spectrum adjustment controller (400) comprises an electric control unit (410), a first temperature control unit (420) and a second temperature control unit (430), the electric control unit (410) is respectively connected with the first temperature control unit (420) and the second temperature control unit (430), the first temperature control unit (420) is used for adjusting the grating region temperature of the chirped fiber grating (200) to change the grating periodic structure of the chirped fiber grating (200), the second temperature control unit (430) is used for adjusting the grating region temperature of the modulated fiber grating (300) to change the grating periodic structure of the modulated fiber grating (300), and the electric control unit (410) is used for sending temperature control instructions to the first temperature control unit (420) and the second temperature control unit (430).
4. The all-fiber optical modulation device according to claim 1, wherein the reflective chirped fiber grating is a chirped fiber bragg grating.
5. The all-fiber optical modulation device according to claim 4, wherein the chirped fiber bragg grating is a single positive dispersion chirped fiber bragg grating.
6. The all-fiber optical modulation device according to claim 4, wherein the chirped fiber bragg grating is provided with a distributed temperature regulator.
7. The all-fiber optical modulation device according to claim 1, wherein the transmissive fiber grating comprises at least one of: bragg fiber gratings, tilted fiber gratings, and long period fiber gratings.
8. An all-fiber optical modulation method, characterized in that the all-fiber optical modulation method is applied to the all-fiber optical modulation device according to any one of claims 1 to 7, comprising:
acquiring an externally input femtosecond seed laser;
performing pulse width broadening treatment on the femtosecond seed laser through a chirped fiber grating to obtain pulse width broadening laser;
and modulating the spectral transmittance of the pulse width spread laser by modulating the fiber bragg grating to obtain the spectral modulated laser.
9. The all-fiber optical modulation method according to claim 8, wherein before the step of acquiring the externally input femtosecond seed laser, the method further comprises:
performing spectrum calculation according to the target femtosecond laser to obtain target modulated laser;
and adjusting the chirped fiber grating and/or the grating area periodic structure of the modulated fiber grating according to the target modulated laser.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117254339A (en) * | 2023-11-10 | 2023-12-19 | 北京卓镭激光技术有限公司 | Narrow pulse width laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117254339A (en) * | 2023-11-10 | 2023-12-19 | 北京卓镭激光技术有限公司 | Narrow pulse width laser |
| CN117254339B (en) * | 2023-11-10 | 2024-02-20 | 北京卓镭激光技术有限公司 | Narrow pulse width laser |
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