CN117254339A - Narrow pulse width laser - Google Patents
Narrow pulse width laser Download PDFInfo
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- CN117254339A CN117254339A CN202311490765.3A CN202311490765A CN117254339A CN 117254339 A CN117254339 A CN 117254339A CN 202311490765 A CN202311490765 A CN 202311490765A CN 117254339 A CN117254339 A CN 117254339A
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- 238000001228 spectrum Methods 0.000 claims abstract description 86
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 14
- 230000003595 spectral effect Effects 0.000 claims description 22
- 230000003321 amplification Effects 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910009372 YVO4 Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2375—Hybrid lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the optical pumping
Abstract
The invention discloses a narrow pulse width laser, and relates to the technical field of lasers. The narrow pulse width laser includes: the device comprises an optical fiber seed source, an optical circulator, a spectrum structure adjusting element, a first optical isolator and a laser amplifying module; the laser generated by the optical fiber seed source enters the optical circulator through the first port, the optical circulator transmits the laser to the spectrum structure adjusting element through the second port, the spectrum structure adjusting element reflects the laser with the preset spectrum width and transmits the laser of the rest part, the reflected laser is output through the third port of the optical circulator, the transmitted laser is input into the laser amplifying module through the first optical isolator, and the laser amplifying module amplifies the power of the input laser. The embodiment does not need to replace the fiber grating according to different pulse width requirements, and is suitable for the situation that the spectrum width is close to or even exceeds the gain spectrum width.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a narrow pulse width laser.
Background
When laser light with a certain spectral bandwidth passes through a gain medium with a limited gain bandwidth, the power of the laser light will be amplified, and the laser light spectrum will be directly narrowed, i.e. the spectral width of the laser light pulse will be narrowed after passing through the power amplifier. This is because the central region of the laser spectrum is typically higher in magnitude than the two sides under the same amplifier gain conditions, which results in a larger gain in the central region of the laser spectrum than the two sides during power amplification, while the two side regions of the laser spectrum are not effectively amplified. Therefore, the laser pulse is amplified, and the entire width of the laser spectrum becomes smaller, and finally the pulse width of the laser beam becomes larger in the time domain.
In view of the above situation, in the prior art, the pulse width of the laser is changed by replacing the fiber bragg grating in the seed source of the laser, and the method needs to prepare a plurality of different fiber bragg gratings at the same time, and when the laser needs to output a narrow pulse width, the output of the laser with the narrow pulse width is realized by replacing the corresponding fiber bragg grating.
However, the replacement of the fiber grating in the prior art is complicated. In addition, when the laser generated by the mode is matched with the all-solid-state laser amplifier, problems can occur, because the gain medium of the all-solid-state laser amplifier is a solid-state laser crystal, the gain bandwidth is limited. At a laser wavelength of around 1064nm, the gain spectral width is typically less than 0.6nm, and when the spectral width of the laser increases in the 0.6nm range, its pulse width decreases. But when the spectral width exceeds the gain spectral width of the solid-state laser crystal (e.g., 0.6 nm), the pulse width narrowing effect will no longer be noticeable. Thus, this method is only applicable to cases where the spectral width of the seed source does not exceed the gain spectral width of the all-solid-state laser amplifier.
Disclosure of Invention
In view of this, the embodiment of the invention provides a narrow pulse width laser, which is suitable for the situation that the spectrum width is close to or even exceeds the gain spectrum width without changing the fiber bragg grating according to different pulse width requirements.
The embodiment of the invention provides a narrow pulse width laser, which comprises the following components: the device comprises an optical fiber seed source, an optical circulator, a spectrum structure adjusting element, a first optical isolator and a laser amplifying module;
the optical fiber seed source is connected with a first port of the optical circulator, the spectrum structure adjusting element is connected with a second port of the optical circulator, and the first optical isolator is respectively connected with the spectrum structure adjusting element and the laser amplifying module;
the laser generated by the optical fiber seed source enters the optical circulator from the first port, the optical circulator transmits the laser to the spectrum structure adjusting element through the second port, the spectrum structure adjusting element reflects laser with a preset spectrum width and transmits the laser of the rest part, the reflected laser is output through the third port of the optical circulator, the transmitted laser is input into the laser amplifying module through the first optical isolator, and the laser amplifying module amplifies the power of the input laser.
Alternatively, the process may be carried out in a single-stage,
the laser amplification module comprises: a laser pre-amplifier, a second optical isolator and a laser main amplifier;
the laser pre-amplifier includes: a first stage laser pre-amplifier and a second stage laser pre-amplifier;
the first-stage laser pre-amplifier is respectively connected with the first optical isolator and the second-stage laser pre-amplifier;
the second optical isolator is respectively connected with the secondary laser pre-amplifier and the laser main amplifier;
the primary laser pre-amplifier is used for preferentially amplifying power of a part of the spectrum of the laser, the wavelength of which is larger than the center wavelength;
the secondary laser pre-amplifier is used for preferentially amplifying power of a part of the spectrum, the wavelength of which is smaller than the center wavelength;
the laser main amplifier is used for amplifying the power of the laser output by the second optical isolator;
the center wavelength is located in a wavelength range corresponding to the preset spectrum width.
Alternatively, the process may be carried out in a single-stage,
the primary laser pre-amplifier comprises: ytterbium-doped fiber amplifiers.
Alternatively, the process may be carried out in a single-stage,
the secondary laser pre-amplifier comprises: nd, YAG amplifier.
Alternatively, the process may be carried out in a single-stage,
the laser main amplifier includes: an all-solid-state laser amplifier.
Alternatively, the process may be carried out in a single-stage,
the spectral structure adjustment element comprises: and a fiber grating.
Alternatively, the process may be carried out in a single-stage,
the laser generated by the optical fiber seed source is picosecond laser.
Alternatively, the process may be carried out in a single-stage,
the pulse width of the laser output by the laser amplifying module is [7ps, 20ps ].
Alternatively, the process may be carried out in a single-stage,
the operating temperature of the spectrum structure adjusting element is [ -20 ℃, 20 ℃).
Alternatively, the process may be carried out in a single-stage,
the preset spectral width is [0.1nm, 0.3nm ].
One embodiment of the above invention has the following advantages or benefits: the spectrum structure adjusting element reflects laser with preset spectrum width and transmits the laser of the rest part, so that the obtained spectrum profile has the characteristics of middle concave and two-side peak. In the power amplification process, the areas on two sides of the spectrum can be effectively amplified, so that the width of the spectrum is integrally enlarged, and finally, the pulse width of the laser in the time domain is narrowed. The embodiment of the invention can ensure that the laser outputs shorter pulse width, and the pulse width of the output laser can be in the level of picoseconds, which is narrower than the pulse width obtained by the prior method. Moreover, the embodiment of the invention does not need to change the pulse width by switching the fiber bragg gratings with different spectrum widths, and is suitable for the situation that the spectrum width is close to or even exceeds the gain spectrum width.
Further effects of the above-described non-conventional alternatives are described below in connection with the embodiments.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic diagram of a narrow pulse width laser provided in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a narrow pulse width laser according to another embodiment of the present invention;
FIG. 3 is a spectrum obtained by a prior art method;
FIG. 4 is a schematic view of the laser pulse width corresponding to FIG. 3;
FIG. 5 is a spectral diagram provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of a laser pulse width according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
As shown in fig. 1, an embodiment of the present invention provides a narrow pulse width laser, including: the optical fiber seed source 1, the optical circulator 2, the spectrum structure adjusting element 3, the first optical isolator 4 and the laser amplifying module 5;
the optical fiber seed source 1 is connected with a first port a of the optical circulator 2, the spectrum structure adjusting element 3 is connected with a second port b of the optical circulator 2, and the first optical isolator 4 is respectively connected with the spectrum structure adjusting element 3 and the laser amplifying module 5;
the laser generated by the optical fiber seed source 1 enters the optical circulator 2 from the first port a, the optical circulator 2 transmits the laser to the spectrum structure adjusting element 3 through the second port b, the spectrum structure adjusting element 3 reflects the laser with the preset spectrum width and transmits the laser of the rest part, the reflected laser is output through the third port c of the optical circulator 2, the transmitted laser is input into the laser amplifying module 5 through the first optical isolator 4, and the laser amplifying module 5 amplifies the power of the input laser.
The optical circulator is used for realizing bidirectional optical signal transmission on a single optical fiber, and the first optical isolator and the second optical isolator are used for blocking return light through Faraday rotation effect, so that unidirectional laser transmission is ensured. The laser amplification module may be an all-solid-state laser amplifier.
According to the embodiment of the invention, the spectrum structure adjusting element reflects laser with the preset spectrum width and transmits the laser of the rest part, so that the obtained spectrum profile has the characteristics of middle concave and two side peaks. In the power amplification process, the areas on two sides of the spectrum can be effectively amplified, so that the width of the spectrum is integrally enlarged, and finally, the pulse width of the laser in the time domain is narrowed. The embodiment of the invention can ensure that the laser outputs shorter pulse width, and the pulse width of the output laser can be in the level of picoseconds, which is narrower than the pulse width obtained by the prior method. Moreover, the embodiment of the invention does not need to change the pulse width by switching the fiber bragg gratings with different spectrum widths, and is suitable for the situation that the spectrum width is close to or even exceeds the gain spectrum width.
To further increase the relative intensity difference between the two side peaks and the middle recess, as shown in fig. 2, in one embodiment of the present invention, the laser amplification module 5 includes: a laser pre-amplifier 50, a second optical isolator 51 and a laser main amplifier 52;
the laser pre-amplifier 50 includes: a primary laser pre-amplifier 501 and a secondary laser pre-amplifier 502;
the first-stage laser pre-amplifier 501 is respectively connected with the first optical isolator 4 and the second-stage laser pre-amplifier 502;
the second optical isolator 51 is connected with the secondary laser pre-amplifier 502 and the laser main amplifier 52 respectively;
a first-stage laser pre-amplifier 501 for preferentially amplifying power of a portion of the spectrum of the laser having a wavelength greater than the center wavelength;
a second-stage laser pre-amplifier 502 for preferentially amplifying power on a portion of the spectrum having a wavelength less than the center wavelength;
a laser main amplifier 52 for amplifying the power of the laser light output from the second optical isolator;
the center wavelength is located in a wavelength range corresponding to a preset spectrum width.
In the embodiment of the invention, the laser pre-amplifier part adopts two-stage power amplification, the first-stage laser pre-amplifier performs power amplification on a long wavelength part in the spectrum, and the second-stage laser pre-amplifier performs power amplification on a short wavelength part in the spectrum.
By the method, the relative intensities of the main peaks at two sides and the middle recess in the spectrum can be respectively adjusted, the middle recess part after spectrum adjustment corresponds to the gain spectrum main peak of the rear-end laser main amplifier, so that the gain spectrum of the laser after spectrum adjustment is matched with that of the rear-end laser main amplifier, and the stored energy extraction in the laser main amplifier is limited due to low power in the middle recess part of the spectrum, so that the rest stored energy in the laser main amplifier amplifies the two sides of the spectrum. In this way, the laser main amplifier can amplify both the middle concave portion and the two side portions, suppressing the spectrum narrowing in the laser main amplifier. The minimum point of the concave portion corresponds to the center wavelength. For example, the center wavelength is 1064.2nm, the preset spectral width is 0.2nm, and the wavelength range corresponding to the preset spectral width is [1064.1 nm,1064.3 nm ]. The center wavelength can be adjusted according to actual requirements.
As shown in fig. 3, a spectrum obtained by the prior art method is shown, wherein a solid line is used for representing a laser spectrum which is not adjusted by the spectrum structure adjusting element, a dotted line is used for representing a gain medium spectrum with a limited gain bandwidth, a dash-dot line is used for representing an amplified laser spectrum, and fig. 4 is a schematic diagram of a laser pulse width corresponding to fig. 3. As can be seen from fig. 3, in the prior art, the laser spectrum has only a single main peak, and after power amplification, the amplitude of the central region of the spectrum increases more obviously, but the amplitude of the two side regions of the spectrum increases more weakly.
As shown in fig. 5, a spectrum obtained by the embodiment of the present invention is shown, wherein a solid line is used for representing the laser spectrum adjusted by the spectrum structure adjusting element, a dotted line is used for representing the spectrum of the gain medium with a limited gain bandwidth, a dash-dot line is used for representing the amplified laser spectrum, and fig. 6 is a schematic diagram of the laser pulse width corresponding to fig. 5. As can be seen from fig. 5, the adjusted spectral profile is characterized by a central depression, two-sided sharp peaks. In the power amplification process, the areas on two sides of the spectrum can be effectively amplified, so that the width of the spectrum is integrally enlarged.
As can be seen by comparing fig. 4 and 6, the pulse width obtained by the embodiment of the present invention is narrower.
In one embodiment of the invention, a primary laser pre-amplifier comprises: ytterbium-doped fiber amplifiers.
The first order laser pre-amplifier preferentially amplifies the long wavelength portion so that the long wavelength portion obtains more energy than the short wavelength portion.
In one embodiment of the invention, a two-stage laser pre-amplifier comprises: nd, YAG amplifier.
The secondary laser pre-amplifier preferentially amplifies the short wavelength portion so that the short wavelength portion obtains more energy than the long wavelength portion.
In one embodiment of the invention, a laser main amplifier includes: an all-solid-state laser amplifier.
The crystal of the all-solid-state laser amplifier may be Nd: YVO4.
In one embodiment of the invention, a spectral structure modification element comprises: and a fiber grating.
The spectral structure modification element may also be an optical lens or the like having a narrow spectrum.
In one embodiment of the invention, the laser light generated by the fiber seed source is a picosecond laser.
In one embodiment of the present invention, the pulse width of the laser light output by the laser amplification module is [7ps, 20ps ]. Specifically, 7ps, 14ps, 20ps.
The pulse width obtained by the embodiment of the invention can reach a bit picosecond value, and the pulse width can be greatly reduced.
In one embodiment of the present invention, the spectral structure adjusting element has an operating temperature of [ -20 ℃, 20 ℃ to correspond the spectrally modified intermediate concave portion to the main peak of the gain spectrum of the back-end laser main amplifier. Specifically, it may be-20 ℃, 5 ℃, 20 ℃ or the like.
The embodiment of the invention can further reduce the output pulse width.
In one embodiment of the invention, the predetermined spectral width is [0.1nm, 0.3nm ].
For example, the predetermined spectral width is 0.1nm, or 0.2nm, or 0.3nm. According to the embodiment of the invention, the laser with preset spectral intensity is reflected back to the c port of the optical circulator, and the laser output by the c port can be used for monitoring the laser of the transmission part.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives can occur depending upon design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A narrow pulse width laser, comprising: the device comprises an optical fiber seed source, an optical circulator, a spectrum structure adjusting element, a first optical isolator and a laser amplifying module;
the optical fiber seed source is connected with a first port of the optical circulator, the spectrum structure adjusting element is connected with a second port of the optical circulator, and the first optical isolator is respectively connected with the spectrum structure adjusting element and the laser amplifying module;
the laser generated by the optical fiber seed source enters the optical circulator from the first port, the optical circulator transmits the laser to the spectrum structure adjusting element through the second port, the spectrum structure adjusting element reflects laser with a preset spectrum width and transmits the laser of the rest part, the reflected laser is output through the third port of the optical circulator, the transmitted laser is input into the laser amplifying module through the first optical isolator, and the laser amplifying module amplifies the power of the input laser.
2. The narrow pulse width laser of claim 1,
the laser amplification module comprises: a laser pre-amplifier, a second optical isolator and a laser main amplifier;
the laser pre-amplifier includes: a first stage laser pre-amplifier and a second stage laser pre-amplifier;
the first-stage laser pre-amplifier is respectively connected with the first optical isolator and the second-stage laser pre-amplifier;
the second optical isolator is respectively connected with the secondary laser pre-amplifier and the laser main amplifier;
the primary laser pre-amplifier is used for preferentially amplifying power of a part of the spectrum of the laser, the wavelength of which is larger than the center wavelength;
the secondary laser pre-amplifier is used for preferentially amplifying power of a part of the spectrum, the wavelength of which is smaller than the center wavelength;
the laser main amplifier is used for amplifying the power of the laser output by the second optical isolator;
the center wavelength is located in a wavelength range corresponding to the preset spectrum width.
3. The narrow pulse width laser of claim 2,
the primary laser pre-amplifier comprises: ytterbium-doped fiber amplifiers.
4. The narrow pulse width laser of claim 2,
the secondary laser pre-amplifier comprises: nd, YAG amplifier.
5. The narrow pulse width laser of claim 2,
the laser main amplifier includes: an all-solid-state laser amplifier.
6. The narrow pulse width laser of claim 2,
the spectral structure adjustment element comprises: and a fiber grating.
7. The narrow pulse width laser of claim 1,
the laser generated by the optical fiber seed source is picosecond laser.
8. The narrow pulse width laser of claim 1,
the pulse width of the laser output by the laser amplifying module is [7ps, 20ps ].
9. The narrow pulse width laser of claim 1,
the operating temperature of the spectrum structure adjusting element is [ -20 ℃, 20 ℃).
10. The narrow pulse width laser of claim 1,
the preset spectral width is [0.1nm, 0.3nm ].
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| CN202311490765.3A CN117254339B (en) | 2023-11-10 | 2023-11-10 | Narrow pulse width laser |
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| CN202311490765.3A CN117254339B (en) | 2023-11-10 | 2023-11-10 | Narrow pulse width laser |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881919A (en) * | 2010-06-02 | 2010-11-10 | 苏州大学 | Optical fiber chirped pulse amplifier for ultra-short laser pulse output |
| WO2015058439A1 (en) * | 2013-10-23 | 2015-04-30 | 华南理工大学 | Light control triggered laser |
| CN113437627A (en) * | 2021-06-07 | 2021-09-24 | 中国科学院上海光学精密机械研究所 | Tunable multi-wavelength multiplexing spectrum modulation and separation system for high-power optical fiber laser amplification |
| CN116009330A (en) * | 2022-11-30 | 2023-04-25 | 深圳技术大学 | All-fiber optical modulation device and all-fiber optical modulation method for suppressing gain narrowing |
| CN218956985U (en) * | 2022-11-30 | 2023-05-02 | 深圳技术大学 | All-fiber optical modulation device for suppressing gain narrowing |
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- 2023-11-10 CN CN202311490765.3A patent/CN117254339B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881919A (en) * | 2010-06-02 | 2010-11-10 | 苏州大学 | Optical fiber chirped pulse amplifier for ultra-short laser pulse output |
| WO2015058439A1 (en) * | 2013-10-23 | 2015-04-30 | 华南理工大学 | Light control triggered laser |
| CN113437627A (en) * | 2021-06-07 | 2021-09-24 | 中国科学院上海光学精密机械研究所 | Tunable multi-wavelength multiplexing spectrum modulation and separation system for high-power optical fiber laser amplification |
| CN116009330A (en) * | 2022-11-30 | 2023-04-25 | 深圳技术大学 | All-fiber optical modulation device and all-fiber optical modulation method for suppressing gain narrowing |
| CN218956985U (en) * | 2022-11-30 | 2023-05-02 | 深圳技术大学 | All-fiber optical modulation device for suppressing gain narrowing |
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