CN113363795A - Nonlinear polarization rotation mode-locking fiber laser - Google Patents
Nonlinear polarization rotation mode-locking fiber laser Download PDFInfo
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- CN113363795A CN113363795A CN202110611321.5A CN202110611321A CN113363795A CN 113363795 A CN113363795 A CN 113363795A CN 202110611321 A CN202110611321 A CN 202110611321A CN 113363795 A CN113363795 A CN 113363795A
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- laser
- beam splitter
- collimator
- splitter prism
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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
- H01S3/05—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
- H01S3/06791—Fibre ring lasers
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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
- H01S3/10061—Polarization control
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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
Abstract
The present invention provides a method comprising: the device comprises a pumping source, a wavelength division multiplexer, a doped optical fiber, a first collimator, a polarization beam splitter prism, an isolator, a second collimator and piezoelectric ceramics; the pump source excites the doped fiber to generate laser through the wavelength division multiplexer, and the laser sequentially passes through the first collimator, the polarization beam splitter prism, the isolator, the second collimator and the piezoelectric ceramic to form an annular resonant cavity; the working process is as follows: after the laser pulse is subjected to nonlinear polarization evolution in the optical fiber, the polarization beam splitter prism is rotated in the direction vertical to the horizontal plane, so that the peak part of the femtosecond laser pulse passes through the polarization beam splitter prism, and the front edge and the rear edge of the pulse are prevented; the working process is continuously circulated in the annular resonant cavity, so that the peak value part of the femtosecond laser pulse is stronger and weaker, and the stable mode-locked femtosecond laser pulse output is finally formed.
Description
Technical Field
The invention belongs to the technical field of mode-locked fiber lasers, and particularly relates to a nonlinear polarization rotation mode-locked fiber laser.
Background
The femtosecond optical frequency comb based on the mode-locked fiber laser establishes the relation between the microwave frequency and the optical frequency, and has important application in the field of high-precision measurement. The mode-locked fiber laser is used as a core component of a femtosecond optical frequency comb, the realization of stable mode-locked femtosecond laser pulse output is crucial, and nonlinear polarization rotation mode locking is a common mode-locked mode.
The nonlinear polarization rotation mode-locking fiber laser generally has two structural forms, one is a space-fiber structure, and the other is an all-fiber structure, and the two structural forms are based on nonlinear polarization evolution of laser pulses in a non-polarization-maintaining single-mode fiber to realize mode locking. The spatial light path part of the nonlinear polarization rotation mode-locked fiber laser mainly comprises an 1/4 wave plate, a 1/2 wave plate and a polarization beam splitter prism, after nonlinear polarization evolution of laser pulses in optical fibers, the polarization state of the laser pulses is controlled by rotating the wave plate combination, polarization selection is carried out through the polarization beam splitter prism, and narrowing and mode-locked output of the laser pulses are finally achieved. In the process, the 1/4 wave plate and 1/2 wave plate combination needs to be repeatedly rotated manually or electrically until a specific angle position is found to realize mode locking femtosecond pulse output, and the adjusting process is complicated. The prior art scheme has the defects that the 1/4 wave plate and 1/2 wave plate combination needs to be repeatedly rotated manually or electrically until a specific angle position is found to realize mode locking femtosecond pulse output, and the adjusting process is complicated.
Disclosure of Invention
The invention aims to provide a nonlinear polarization rotation mode-locking fiber laser, which simplifies the composition structure and the mode-locking process of the mode-locking fiber laser and improves the stability and the reliability of the mode-locking fiber laser.
The technical scheme of the invention is as follows: a nonlinear polarization rotating mode-locked fiber laser, comprising: the device comprises a pumping source, a wavelength division multiplexer, a doped optical fiber, a first collimator, a polarization beam splitter prism, an isolator, a second collimator and piezoelectric ceramics; the pump source excites the doped fiber to generate laser through the wavelength division multiplexer, and the laser sequentially passes through the first collimator, the polarization beam splitter prism, the isolator, the second collimator and the piezoelectric ceramic to form an annular resonant cavity; the working process is as follows: after the laser pulse is subjected to nonlinear polarization evolution in the optical fiber, the polarization beam splitter prism is rotated in the direction vertical to the horizontal plane, so that the peak part of the femtosecond laser pulse passes through the polarization beam splitter prism, and the front edge and the rear edge of the pulse are prevented; the working process is continuously circulated in the annular resonant cavity, so that the peak value part of the femtosecond laser pulse is stronger and weaker, and the stable mode-locked femtosecond laser pulse output is finally formed.
In the above, the isolator is configured to ensure unidirectional operation of femtosecond laser pulses in the resonant cavity.
In the foregoing, the first collimator, the polarization beam splitter prism, the isolator, and the second collimator are configured to implement nonlinear polarization rotation mode locking of the femtosecond laser.
In the above, the piezoelectric ceramic is used to tune the cavity length of the laser resonant cavity and control the repetition frequency of the femtosecond laser pulse.
The nonlinear polarization rotation mode-locked fiber laser of claim 4, wherein the narrowing and mode-locked output of the femtosecond laser pulse are realized by rotating the polarization beam splitter prism to select and control the polarization state of the femtosecond laser pulse in the laser resonant cavity
By adopting the scheme, the mode locking process is realized only by rotating the polarization beam splitter prism, compared with the prior art that the combination of 1/4 wave plates and 1/2 wave plates needs to be rotated, the mode locking fiber laser has the advantages of less control parameters, simple structure and improved stability and reliability.
Drawings
Fig. 1 is a schematic diagram of a nonlinear polarization rotation mode-locked fiber laser in the prior art.
FIG. 2 is a schematic diagram of a nonlinear polarization rotation mode-locked fiber laser according to the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 2, an embodiment of the present invention is a nonlinear polarization rotation mode-locked fiber laser including: the device comprises a pumping source, a wavelength division multiplexer, a doped optical fiber, a collimator 1, a polarization beam splitter prism, an isolator, a collimator 2 and piezoelectric ceramics. The pump source excites the doped fiber to generate laser light through the wavelength division multiplexer. The device comprises a collimator 1, a polarization beam splitter prism, an isolator and a collimator 2, and is used for realizing nonlinear polarization rotation mode locking of femtosecond laser. The isolator is used for ensuring the unidirectional operation of the femtosecond laser pulse in the resonant cavity; the piezoelectric ceramic is used for tuning the cavity length of the laser resonant cavity and controlling the repetition frequency of femtosecond laser pulses.
The specific working principle is as follows: a pumping source excites a doped fiber through a wavelength division multiplexer to generate laser, and the laser passes through a collimator 1, a polarization beam splitter prism, an isolator, a collimator 2 and piezoelectric ceramics in sequence to form an annular resonant cavity; the isolator is used for ensuring the unidirectional operation of the femtosecond laser pulse in the resonant cavity; after the laser pulse is subjected to nonlinear polarization evolution in the optical fiber, the peak value of the laser pulse is different from the polarization state at the positions of the front edge and the rear edge. By rotating the polarization beam splitter prism in the direction vertical to the horizontal plane, the polarization state of the peak part of the laser pulse is the same as the polarization state of the transmission optical axis of the polarization beam splitter prism, the laser pulse can pass through the polarization beam splitter prism with smaller loss, and the front edge and the rear edge of the laser pulse are prevented from passing through due to the difference of the polarization states of the transmission optical axis of the polarization beam splitter prism and the loss. The working principle is that the laser pulse continuously circulates in the annular resonant cavity, so that the peak value part of the laser pulse is stronger and weaker, the front edge and the rear edge of the pulse are weaker and weaker, the width of the laser pulse is continuously narrowed, and the mode-locked femtosecond laser pulse output is realized.
The polarization state of the femtosecond laser pulse in the resonant cavity of the laser is selected and controlled by rotating the polarization beam splitter prism, so that the narrowing and mode-locked output of the femtosecond laser pulse are realized.
Compared with the prior art that the combination of 1/4 wave plates and 1/2 wave plates needs to be rotated, the mode locking process is realized only by rotating the polarization beam splitter prism, the control parameters are less, the structure is simple, and the stability and the reliability of the mode locking fiber laser are improved.
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A nonlinear polarization rotating mode-locked fiber laser, comprising: the device comprises a pumping source, a wavelength division multiplexer, a doped optical fiber, a first collimator, a polarization beam splitter prism, an isolator, a second collimator and piezoelectric ceramics; the pump source excites the doped fiber to generate laser through the wavelength division multiplexer, and the laser sequentially passes through the first collimator, the polarization beam splitter prism, the isolator, the second collimator and the piezoelectric ceramic to form an annular resonant cavity; the working process is as follows: after the laser pulse is subjected to nonlinear polarization evolution in the optical fiber, the polarization beam splitter prism is rotated in the direction vertical to the horizontal plane, so that the peak part of the femtosecond laser pulse passes through the polarization beam splitter prism, and the front edge and the rear edge of the pulse are prevented; the working process is continuously circulated in the annular resonant cavity, so that the peak value part of the femtosecond laser pulse is stronger and weaker, and the stable mode-locked femtosecond laser pulse output is finally formed.
2. The nonlinear polarization rotation mode-locked fiber laser of claim 1, wherein the isolator is configured to ensure unidirectional operation of femtosecond laser pulses within the cavity.
3. The nonlinear polarization rotation mode-locked fiber laser of claim 2, wherein the first collimator, the polarization beam splitter prism, the isolator, and the second collimator are configured to realize nonlinear polarization rotation mode locking of the femtosecond laser.
4. The nonlinear polarization rotation mode-locked fiber laser of claim 3, wherein the piezoelectric ceramic is used for tuning a cavity length of a laser cavity and controlling a repetition rate of femtosecond laser pulses.
5. The nonlinear polarization rotation mode-locked fiber laser of claim 4, wherein the narrowing and mode-locked output of the femtosecond laser pulses are realized by rotating the polarization beam splitter prism to select and control the polarization state of the femtosecond laser pulses in the laser resonant cavity.
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| CN202110611321.5A CN113363795A (en) | 2021-06-01 | 2021-06-01 | Nonlinear polarization rotation mode-locking fiber laser |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202906187U (en) * | 2012-04-28 | 2013-04-24 | 深圳大学 | A passive mode-locking fiber laser, and a resonant cavity and a rotation angle adjusting device of the passive mode-locking fiber laser |
| CN103996962A (en) * | 2014-05-30 | 2014-08-20 | 江苏师范大学 | Nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser |
| CN203883307U (en) * | 2014-05-28 | 2014-10-15 | 上海朗研光电科技有限公司 | Polarizing beam-combining nonlinear rotating mode-locked laser |
| CN105071208A (en) * | 2015-07-31 | 2015-11-18 | 江苏师范大学 | Nonlinear polarization rotation mode-locked pulse laser and one-way mode-locked operation method |
| CN106785831A (en) * | 2016-11-15 | 2017-05-31 | 长春理工大学 | Repetition rate is adjustable to mix thulium mode locked fiber laser |
| CN107895881A (en) * | 2017-10-20 | 2018-04-10 | 上海理工大学 | The fine nonlinear polarization rotation mode-locked laser of full polarization |
| US20190181606A1 (en) * | 2017-12-13 | 2019-06-13 | Industrial Technology Research Institute | Mode-locked fiber laser device |
-
2021
- 2021-06-01 CN CN202110611321.5A patent/CN113363795A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202906187U (en) * | 2012-04-28 | 2013-04-24 | 深圳大学 | A passive mode-locking fiber laser, and a resonant cavity and a rotation angle adjusting device of the passive mode-locking fiber laser |
| CN203883307U (en) * | 2014-05-28 | 2014-10-15 | 上海朗研光电科技有限公司 | Polarizing beam-combining nonlinear rotating mode-locked laser |
| CN103996962A (en) * | 2014-05-30 | 2014-08-20 | 江苏师范大学 | Nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser |
| CN105071208A (en) * | 2015-07-31 | 2015-11-18 | 江苏师范大学 | Nonlinear polarization rotation mode-locked pulse laser and one-way mode-locked operation method |
| CN106785831A (en) * | 2016-11-15 | 2017-05-31 | 长春理工大学 | Repetition rate is adjustable to mix thulium mode locked fiber laser |
| CN107895881A (en) * | 2017-10-20 | 2018-04-10 | 上海理工大学 | The fine nonlinear polarization rotation mode-locked laser of full polarization |
| US20190181606A1 (en) * | 2017-12-13 | 2019-06-13 | Industrial Technology Research Institute | Mode-locked fiber laser device |
Non-Patent Citations (1)
| Title |
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| JIANMING SHANG: "Simple and efficient nonlinear polarization evolution mode-locked fiber laser by three-dimensionally manipulating a polarization beam splitter", 《OPTICS LETTERS》 * |
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Application publication date: 20210907 |