CN109361145B - Single-wavelength tunable Q-mode locking pulse laser - Google Patents
Single-wavelength tunable Q-mode locking pulse laser Download PDFInfo
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- CN109361145B CN109361145B CN201811581662.7A CN201811581662A CN109361145B CN 109361145 B CN109361145 B CN 109361145B CN 201811581662 A CN201811581662 A CN 201811581662A CN 109361145 B CN109361145 B CN 109361145B
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- 239000000835 fiber Substances 0.000 claims abstract description 43
- 230000010287 polarization Effects 0.000 claims abstract description 34
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 25
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
- 239000006185 dispersion Substances 0.000 claims description 6
- 230000010363 phase shift Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 9
- 238000004891 communication Methods 0.000 abstract description 2
- 239000003814 drug Substances 0.000 abstract description 2
- 238000005459 micromachining Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003595 spectral effect Effects 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
-
- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate
-
- 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
- H01S3/10061—Polarization control
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The application discloses a single wavelength tunable Q-mode locking pulse laser, comprising: pump light source, unidirectional operation ring, two-way ring, unidirectional operation ring includes: the first polarization controller, the polarization independent isolator, the output coupler, the polarization independent isolator, the first polarization controller form the annular through the optical fiber in series connection in turn, the two-way ring includes: wavelength division multiplexer, erbium-doped gain fiber, second polarization controller, single mode fiber. The unidirectional operation ring and the bidirectional ring form an 8-shaped laser cavity, and the first polarization controller and the second polarization controller realize Q-switching mode locking and single-wavelength tunability, so that the laser can be used in the fields of micromachining, nonlinear optics, surgical medicine, optical communication, photoelectric detection and the like.
Description
Technical Field
The application relates to the technical field of optics, in particular to a laser.
Background
It has been found that there are a variety of operating states in lasers, such as mode locking, Q-switching mode locking, continuous wave and harmonic mode locking, and the like. In various operating states, the Q-switched mode-locked pulse is characterized by the mode-locked pulse having a long-period Q-switched envelope. The Q-switched mode locking has unique value in the aspect of mechanism research of an optical fiber laser because the Q-switched mode locking has the characteristics of two operation states of Q-switched and mode locking. In addition, the Q-switched mode-locked pulse has potential application value in micromachining, nonlinear optics, surgical medicine, multiphoton microscopy and the like, and is therefore widely focused and studied.
At present, there are many technical schemes in fiber lasers for realizing Q-switching mode locking, for example, based on nonlinear polarization rotation technology, nonlinear amplification environment, semiconductor saturable absorber and the like, but the technology for generating Q-switching mode locking mainly aims at the traditional single-wavelength Q-switching mode locking pulse. In the aspect of wavelength tunability, the central wavelength of the generated pulse can be tuned in a very wide spectral range, so that the method can be applied to the field of dense wavelength division multiplexing of optical communication, can be also applied to the field of optical signal processing and wavelength conversion, can also be used as a light source for high-speed optical switching, and has very wide application prospect.
The existing laser is difficult to realize the tunable Q-switched mode-locking wavelength. The application aims to realize the tuning Q and mode locking single-wavelength tunability in an optical fiber laser.
Disclosure of Invention
The purpose of the application is that: the fiber laser can realize the tuning of Q and mode locking and is adjustable in single wavelength.
The application solves the technical problems as follows: a single wavelength tunable Q-mode locked pulse laser comprising: pump light source, unidirectional operation ring, two-way ring, unidirectional operation ring includes: the first polarization controller, the polarization independent isolator, the output coupler, the polarization independent isolator, the first polarization controller concatenate through optic fibre in proper order and form the cyclic annular, two-way ring includes: the device comprises a wavelength division multiplexer, an erbium-doped gain fiber, a second polarization controller and a single-mode fiber, wherein the second polarization controller, the single-mode fiber, the wavelength division multiplexer and the erbium-doped gain fiber are connected in series through the fiber to form a ring shape, two ends of a unidirectional operation ring are respectively connected with one side port of a 2X 2 fiber coupler, two ends of a bidirectional ring are respectively connected with the other side port of the 2X 2 fiber coupler, and output light of a pumping light source enters the bidirectional ring through the wavelength division multiplexer.
Further, the group velocity dispersion parameter of the erbium-doped gain fiber is-15 ps/nm/km, the group velocity dispersion parameter of the single-mode fiber is 17ps/nm/km, the length of the erbium-doped gain fiber is 1.8m, and the length of the single-mode fiber is 30m.
Further, the wavelength of the output light of the pump light source is 980nm.
The beneficial effects of the application are as follows: a laser cavity in an 8 shape is formed by the unidirectional operation ring and the bidirectional ring, and meanwhile, Q-switching mode locking and single-wavelength tunability are realized by the aid of the first polarization controller and the second polarization controller.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the application, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a laser according to the present application;
fig. 2 is a schematic diagram of the optical path of a laser cavity of the inventive laser.
Detailed Description
The conception, specific structure, and technical effects produced by the present application will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present application. It is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present application based on the embodiments of the present application. In addition, all coupling/connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to the fact that a more optimal coupling structure may be formed by adding or subtracting coupling aids depending on the particular implementation. The technical features in the application can be interactively combined on the premise of no contradiction and conflict.
Example 1, referring to fig. 1, a single wavelength tunable, Q-mode locked pulse laser, comprising: a pump light source 4, a unidirectional operation ring 1, a bidirectional ring 2; the unidirectional operation ring 1 includes: the first polarization controller 13, the polarization independent isolator 12 and the output coupler 11 are connected in series through optical fibers in sequence to form a ring shape; the polarization independent isolator 12 can conduct incident light in a specific direction, so that unidirectional conduction is realized.
The bi-directional ring 2 comprises: the wavelength division multiplexer 23, the erbium-doped gain fiber 24, the second polarization controller 21 and the single-mode fiber 22, wherein the second polarization controller 21, the single-mode fiber 22, the wavelength division multiplexer 23 and the erbium-doped gain fiber 24 are connected in series through the optical fibers to form a ring; two ends of the unidirectional operation ring 1 are respectively connected with one side port of the 2X 2 optical fiber coupler 3, and two ends of the bidirectional ring 2 are respectively connected with the other side port of the 2X 2 optical fiber coupler 3. Optimally, the group velocity dispersion parameter of the erbium-doped gain fiber 24 is-15 ps/nm/km, the group velocity dispersion parameter of the single-mode fiber 22 is about 17ps/nm/km, the length of the erbium-doped gain fiber 24 is 1.8m, and the length of the single-mode fiber 22 is 30m. The wavelength of the output light of the pump light source 4 is 980nm.
In this embodiment, the wavelength division multiplexer 23 is an optical wave multiplexing of 980nm and 1550nm, that is, the wavelength division multiplexer 23 is provided with a 980nm optical wave input end and a 1550nm optical wave input end, wherein the 980nm optical wave input end is connected with the output end of the pump light source 4, and the output light of the pump light source 4 enters the bidirectional ring 2 through the wavelength division multiplexer 23.
Referring to fig. 2, when the present laser is operated, 980nm light emitted from the pump light source 4 enters the erbium-doped gain fiber 24 through the wavelength division multiplexer 23 to generate 1550nm laser, the 1550nm laser emits equally-divided laser light at two ends of the unidirectional operation ring 1 through the 2 x 2 fiber coupler 3, the laser light is transmitted clockwise in the unidirectional operation ring 1 due to isolation of the polarization independent isolator 12, as shown by an arrow in fig. 2, the clockwise rotated laser light enters the 2 x 2 fiber coupler 3 from one side port of the 2 x 2 fiber coupler 3, and enters the bidirectional ring 2 from the other side port of the 2×2 fiber coupler 3, at this time, the laser entering the bidirectional ring 2 is respectively transmitted in two directions of clockwise and anticlockwise of the bidirectional ring 2, and the two beams of light accumulate nonlinear phase shift through the loop of the bidirectional ring 2, and meanwhile, the laser is positively fed back and then converged into the 2×2 coupler 3 to interfere due to the single-mode fiber 22 and the erbium-doped gain fiber 24, and is output from the output end of the output coupler 11.
The laser utilizes a unidirectional operation ring 1 and a bidirectional ring 2 to form an 8-shaped laser cavity, two beams of light transmitted along opposite directions are transmitted once in the bidirectional ring 2 to obtain different nonlinear phase shifts, and the nonlinear phase shifts can change along the time domain contour of a pulse. The parameters of the laser cavity are properly adjusted by the first polarization controller 13 and the second polarization controller 21, namely Q-switching and tuning respectively, so that the phase difference of the light intensity at the center of the pulse is close to pi, the transmissivity is close to 100%, and the two wing parts of the pulse are transmitted, and the transmissivity is small due to smaller phase shift obtained by lower power, so that the two wing parts are reflected. The pulses output from within the bi-directional ring 2 are therefore narrower than the pulses input, similar to the function of a real saturable absorber. By properly adjusting the second polarization controller 21, the bidirectional ring 2 can be used as a wavelength selector to realize single-wavelength tuning, and stable single-wavelength tunable Q-mode locking pulse sequence output is obtained.
While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (3)
1. The utility model provides a single wavelength tunable tuning Q mode locking pulse laser, includes pumping light source, its characterized in that still includes: a unidirectional operation ring, a bidirectional ring, the unidirectional operation ring comprising: the first polarization controller, the polarization independent isolator, the output coupler, the polarization independent isolator, the first polarization controller concatenate through optic fibre in proper order and form the cyclic annular, two-way ring includes: the device comprises a wavelength division multiplexer, an erbium-doped gain fiber, a second polarization controller and a single-mode fiber, wherein the second polarization controller, the single-mode fiber, the wavelength division multiplexer and the erbium-doped gain fiber are connected in series through the fiber to form a ring shape, two ends of a unidirectional operation ring are respectively connected with one side port of a 2X 2 fiber coupler, two ends of a bidirectional ring are respectively connected with the other side port of the 2X 2 fiber coupler, and output light of the pump light source enters the bidirectional ring through the wavelength division multiplexer;
when the laser works, light emitted by the pumping light source enters the erbium-doped gain optical fiber through the wavelength division multiplexer to generate laser, the laser emits laser with uniform light intensity at two ends of the unidirectional operation ring through the optical fiber coupler, the laser is transmitted clockwise in the unidirectional operation ring through the polarization independent isolator, the clockwise-rotated laser enters the bidirectional ring through the optical fiber coupler, the laser entering the bidirectional ring is respectively transmitted along the clockwise direction and the anticlockwise direction of the bidirectional ring, nonlinear phase shift is accumulated on the two beams of light through the loop of the bidirectional ring, the nonlinear phase shift changes along the time domain outline of a pulse, positive feedback is formed through the single-mode optical fiber and the erbium-doped gain optical fiber, interference is generated through the optical fiber coupler, and interference light is output through the output coupler;
the first polarization controller is used for modulating Q, the second polarization controller is used for tuning single wavelength, so that the light intensity at the center of the pulse light output by the bidirectional ring is transmitted, the two wing parts of the pulse light output by the bidirectional ring are reflected, and the pulse light output by the bidirectional ring is narrower than the pulse light input to the bidirectional ring.
2. The single wavelength tunable Q-locked pulse laser of claim 1, wherein the erbium-doped gain fiber has a group velocity dispersion parameter of-15 ps/nm/km, the single mode fiber has a group velocity dispersion parameter of 17ps/nm/km, the erbium-doped gain fiber has a length of 1.8m, and the single mode fiber has a length of 30m.
3. The single wavelength tunable Q-switched pulsed laser of claim 1, wherein the wavelength of the output light of the pump light source is 980nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581662.7A CN109361145B (en) | 2018-12-24 | 2018-12-24 | Single-wavelength tunable Q-mode locking pulse laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581662.7A CN109361145B (en) | 2018-12-24 | 2018-12-24 | Single-wavelength tunable Q-mode locking pulse laser |
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| CN109361145A CN109361145A (en) | 2019-02-19 |
| CN109361145B true CN109361145B (en) | 2023-12-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113097844B (en) * | 2021-04-02 | 2022-11-22 | 电子科技大学 | Single frequency Q-switching laser |
| CN114935795A (en) * | 2022-07-25 | 2022-08-23 | 中国科学技术大学 | Bidirectional isolator related to polarization maintaining optical fiber fast and slow axes and bidirectional mode-locked laser |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR970031506A (en) * | 1995-11-29 | 1997-06-26 | 양승택 | Tunable Soliton Fiber Laser |
| US6385216B1 (en) * | 1998-12-03 | 2002-05-07 | Electronics And Telecommunications Research Institute | Optical fiber mode-locked laser |
| CN1909306A (en) * | 2006-09-01 | 2007-02-07 | 中国科学院西安光学精密机械研究所 | '8' character cavity passive mode-locking pulse optical fibre laser |
| WO2015073257A1 (en) * | 2013-11-12 | 2015-05-21 | Imra America, Inc. | Compact fiber short pulse laser sources |
| CN108847570A (en) * | 2018-08-06 | 2018-11-20 | 佛山科学技术学院 | It is a kind of for generating the device of Q-switch and mode-locking noise like square-wave pulse |
| CN209056762U (en) * | 2018-12-24 | 2019-07-02 | 佛山科学技术学院 | Single wavelength is tunable Q-switch and mode-locking pulse laser |
-
2018
- 2018-12-24 CN CN201811581662.7A patent/CN109361145B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| KR970031506A (en) * | 1995-11-29 | 1997-06-26 | 양승택 | Tunable Soliton Fiber Laser |
| US6385216B1 (en) * | 1998-12-03 | 2002-05-07 | Electronics And Telecommunications Research Institute | Optical fiber mode-locked laser |
| CN1909306A (en) * | 2006-09-01 | 2007-02-07 | 中国科学院西安光学精密机械研究所 | '8' character cavity passive mode-locking pulse optical fibre laser |
| WO2015073257A1 (en) * | 2013-11-12 | 2015-05-21 | Imra America, Inc. | Compact fiber short pulse laser sources |
| CN108847570A (en) * | 2018-08-06 | 2018-11-20 | 佛山科学技术学院 | It is a kind of for generating the device of Q-switch and mode-locking noise like square-wave pulse |
| CN209056762U (en) * | 2018-12-24 | 2019-07-02 | 佛山科学技术学院 | Single wavelength is tunable Q-switch and mode-locking pulse laser |
Non-Patent Citations (1)
| Title |
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| 基于8字型腔的自调Q多波长被动锁模光纤激光器;叶雯;《中国光学学会2010年光学大会论文集》;第1-9页 * |
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