CN106961067B - High repetition frequency compact industrial mode-locked fiber laser - Google Patents
High repetition frequency compact industrial mode-locked fiber laser Download PDFInfo
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- CN106961067B CN106961067B CN201710373470.6A CN201710373470A CN106961067B CN 106961067 B CN106961067 B CN 106961067B CN 201710373470 A CN201710373470 A CN 201710373470A CN 106961067 B CN106961067 B CN 106961067B
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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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
- H01S3/1109—Active mode locking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention discloses a high repetition frequency compact industrial-level mode-locked fiber laser, which adopts compact discrete optical element encapsulation, reduces the number of elements, improves the overall stability and reliability, and is beneficial to improving the repetition frequency; the phase bias technology is integrated in the optical path, so that the starting difficulty of the laser is reduced, a lower mode locking starting threshold value is obtained, and the problem of difficult self-starting of the laser is solved; the optical fiber wavelength division multiplexing collimator is used for replacing the conventional optical fiber wavelength division multiplexer and optical fiber collimator, so that the coupling power and efficiency are improved, and the repetition frequency of the mode-locked laser is effectively improved; the Faraday rotary mirror is used for replacing a conventional optical fiber isolator, so that the length of an optical fiber in the optical fiber laser is reduced, the structure of the laser is simplified, and the discrete components of the laser are reduced to the minimum.
Description
[ technical field ]
The invention relates to a compact industrial mode-locked fiber laser with high repetition frequency.
[ background Art ]
In recent years, the demand for ultrafast lasers has been expanding driven by several fields such as spectroscopy, nonlinear optical imaging and other scientific research. In particular, the demand for high-end picosecond and femtosecond lasers continues to grow in the industry high-end micromachining market, which has grown rapidly in recent years. However, these fields, represented by industry, place higher demands on the stability of operation of ultrafast lasers in different environments, and the stability and reliability of industrial ultrafast lasers, especially seed sources, have not been well resolved. The use of fiber optic technology instead of solid seed source technology has its own advantages, and lasers utilizing fully polarization maintaining fibers in fiber optic technology are more considered as an effective approach to combat environmental changes.
The technology commonly used at present is to use the mode locking technology of the saturable absorber to manufacture the full polarization maintaining fiber laser. However, saturable absorber elements such as semiconductor saturable absorber (SESAM), carbon nanotube saturable absorber, graphene saturable absorber, etc. all suffer from low damage threshold and decay over time, which limits their exit from the laboratory to a wider industrial market. On the other hand, the fiber laser technology using nonlinear rotating polarization effect (NPE) cannot fully utilize the full polarization maintaining system, and has no application of polarization maintaining fiber, so that the NPE technology is easily interfered by the environment.
Therefore, how to overcome the above-mentioned drawbacks has become an important issue to be solved by the person skilled in the art.
[ summary of the invention ]
The invention overcomes the defects of the technology, and provides the compact industrial mode-locked fiber laser with high repetition frequency, which integrates the phase bias technology in the optical path, reduces the starting difficulty of the laser, obtains a lower mode-locked starting threshold value and improves the self-starting difficulty of the laser.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the compact industrial mode-locked fiber laser with high repetition frequency comprises a first pump source 1, a first wavelength division multiplexing collimator 2, a first half wave plate 3, a beam splitter 4, a first reflecting mirror 5, a polarization beam splitting cube 6, a Faraday rotary mirror 7, an eighth wave plate 8 on the Faraday rotary mirror 7, a second reflecting mirror 9, a grating pair (10), a second half wave plate 11, a second wavelength division multiplexing collimator 12, a second pump source 13 and an optical fiber 14; the output end of the first pump source 1 is connected with the wavelength division multiplexing input end of the first wavelength division multiplexing collimator 2, and the output end of the second pump source 13 is connected with the wavelength division multiplexing input end of the second wavelength division multiplexing collimator 12; the first reflecting mirror 5, the beam splitter 4, the polarization beam splitting cube 6, the Faraday rotator 7, the eighth wave plate 8 and the second reflecting mirror 9 are sequentially and linearly arranged; the first half wave plate 3 is arranged between the collimation emergent end of the first wavelength division multiplexing collimator 2 and the beam splitter 4, and one end of the beam splitter 4 away from the first half wave plate 3 is used as a pulse laser emergent end of the fiber laser; the second half wave plate 11 is arranged between the collimation emergent end of the second wavelength division multiplexing collimator 12 and the polarization beam splitting cube 6; the tail fibers of the first wavelength division multiplexing collimator 2 and the tail fibers of the second wavelength division multiplexing collimator 12 are connected through an optical fiber 14, wherein at least one of the tail fibers of the first wavelength division multiplexing collimator 12, the tail fibers of the second wavelength division multiplexing collimator 12 and the optical fiber 14 adopts a polarization maintaining gain optical fiber; the optical path of the fiber laser is also provided with a bandwidth limiting element for limiting bandwidth.
A high repetition rate compact industrial scale mode-locked fiber laser as described above, the bandwidth limiting element is a grating pair 10 arranged between the polarizing beam splitting cube 6 and the second half wave plate 11 or a bandpass filter 15 arranged between the first mirror 5 and the beam splitter 4.
A high repetition rate compact industrial-scale mode-locked fiber laser as described above, the beam splitter 4 is a beam splitting plate or a beam splitting cube.
Compared with the prior art, the invention has the beneficial effects that:
the optical fiber laser adopts compact discrete optical element package, reduces the number of elements, improves the overall stability and reliability, and is beneficial to improving the repetition frequency; the phase bias technology is integrated in the optical path, so that the starting difficulty of the laser is reduced, a lower mode locking starting threshold value is obtained, and the problem of difficult self-starting of the laser is solved; the optical fiber wavelength division multiplexing collimator is used for replacing the conventional optical fiber wavelength division multiplexer and optical fiber collimator, so that the coupling power and efficiency are improved, and the repetition frequency of the mode-locked laser is effectively improved; the Faraday rotary mirror is used for replacing a conventional optical fiber isolator, so that the length of an optical fiber in the optical fiber laser is reduced, the structure of the laser is simplified, and the discrete components of the laser are reduced to the minimum.
[ description of the drawings ]
Fig. 1 is a structural diagram of embodiment 1 of this application.
Fig. 2 is a structural diagram of embodiment 2 of the present case.
Detailed description of the preferred embodiments
The features of the invention and other related features are described in further detail below by way of example in conjunction with the following figures to facilitate understanding by those skilled in the art:
as shown in fig. 1 or fig. 2, a high repetition frequency compact industrial-scale mode-locked fiber laser includes a first pump source 1, a first wavelength division multiplexing collimator 2, a first half-wave plate 3, a beam splitter 4, a first reflecting mirror 5, a polarization beam splitting cube 6, a faraday rotator 7, an eighth-wave plate 8 on the faraday rotator 7, a second reflecting mirror 9, a grating pair (10), a second half-wave plate 11, a second wavelength division multiplexing collimator 12, a second pump source 13, and an optical fiber 14; the output end of the first pump source 1 is connected with the wavelength division multiplexing input end of the first wavelength division multiplexing collimator 2, and the output end of the second pump source 13 is connected with the wavelength division multiplexing input end of the second wavelength division multiplexing collimator 12; the first reflecting mirror 5, the beam splitter 4, the polarization beam splitting cube 6, the Faraday rotator 7, the eighth wave plate 8 and the second reflecting mirror 9 are sequentially and linearly arranged; the first half wave plate 3 is arranged between the collimation emergent end of the first wavelength division multiplexing collimator 2 and the beam splitter 4, and one end of the beam splitter 4 away from the first half wave plate 3 is used as a pulse laser emergent end of the fiber laser; the second half wave plate 11 is arranged between the collimation emergent end of the second wavelength division multiplexing collimator 12 and the polarization beam splitting cube 6; the tail fibers of the first wavelength division multiplexing collimator 2 and the tail fibers of the second wavelength division multiplexing collimator 12 are connected through an optical fiber 14, wherein at least one of the tail fibers of the first wavelength division multiplexing collimator 12, the tail fibers of the second wavelength division multiplexing collimator 12 and the optical fiber 14 adopts a polarization maintaining gain optical fiber; the optical path of the fiber laser is further provided with a bandwidth limiting element for bandwidth limitation, and in the implementation, the bandwidth limiting element is a grating pair 10 arranged between the polarization beam splitting cube 6 and the second half-wave plate 11 as shown in fig. 1, or is a band-pass filter 15 arranged between the first reflecting mirror 5 and the beam splitter 4 as shown in fig. 2.
As described above, in the embodiment, the beam splitter 4 is a beam splitter plate or a beam splitter cube.
As described above, the working principle and the working process of the scheme are as follows:
when the optical fiber laser works, the first pump source 1 couples pump light into the cavity through the first wavelength division multiplexing collimator 2 and the second pump source 13 and couples pump light into the cavity through the second wavelength division multiplexing collimator 12, and the laser is oscillated by increasing pump power to be above the threshold value of the optical fiber laser; the polarization state output by the first wavelength division multiplexing collimator 2 is consistent with the transmission direction of the polarization beam splitting cube 6 through the first half wave plate 3; the polarization state output by the second wavelength division multiplexing collimator 12 is aligned with the 90 degree reflection direction of the polarization beam splitting cube 6 by the second half wave plate 11. The fiber laser outputs ultra-short pulse laser light from one end of a beam splitter 4.
As described above, the light is phase-biased in the cavity, and the P-polarized light reflected from the first mirror 5 is split into two beams after passing through the beam splitter 4.
The first light beam is reflected from the beam splitter 4, passes through the first half wave plate 3 to adjust the light to the slow axis of the first wavelength division multiplexing collimator 2, passes through the tail fiber of the first wavelength division multiplexing collimator 2 and the tail fiber of the optical fiber 14 to reach the tail fiber of the second wavelength division multiplexing collimator 12, is output to the space by the second wavelength division multiplexing collimator 12, and the space light is reflected by the polarization beam splitting cube 6 to enter the Faraday rotator 7 after being adjusted to S light by the second half wave plate 11, enters the slow axis of the eighth wave plate 8 after rotating clockwise by 45 degrees, enters the slow axis of the eighth wave plate 8 again after being reflected by the second reflecting mirror 9, and turns into P light after rotating clockwise by 45 degrees to directly exit the polarization beam splitting cube 6 and enter the beam splitter 4 again.
The second P polarization of the light beam directly passes through the beam splitter 4 and the polarization beam splitting cube 6, enters the fast axis of the eighth wave plate 8 after rotating for 45 degrees by the Faraday rotation mirror 7, and passes through the fast axis of the eighth wave plate 8 again after being reflected by the second reflecting mirror 9; and the polarization light is changed into S polarization after being clockwise rotated by 45 degrees through the Faraday rotation mirror 7, the S polarization light is rotated to the slow axis of the second wavelength division multiplexing collimator 12 after passing through the second half wave plate 11, and enters the tail fiber of the first wavelength division multiplexing collimator 2 after passing through the optical fiber 14, and the polarization light output by the slow axis of the first wavelength division multiplexing collimator 2 is rotated into P light through the first half wave plate 3 and enters the beam splitter 4.
After the half-wave loss is subtracted, the first beam and the second beam pass through the asymmetrical sagnac loop, the first beam and the second beam generate
The phase difference of Pi greatly reduces the difficulty of mode locking starting, combines the nonlinear phase shift mode locking of the first light beam and the second light beam generated by nonlinear amplification loop mirror effect, greatly reduces the threshold value of mode locking starting, improves the repetition frequency, and simultaneously improves the overall stability and reliability.
As mentioned above, the present disclosure protects a compact industrial-scale mode-locked fiber laser with high repetition frequency, and all technical schemes which are the same as or similar to the structure of the present disclosure should be shown as falling within the scope of the present disclosure.
Claims (3)
1. The compact industrial-level mode-locked fiber laser with high repetition frequency is characterized by comprising a first pumping source (1), a first wavelength division multiplexing collimator (2), a first half-wave plate (3), a beam splitter (4), a first reflecting mirror (5), a polarization beam splitting cube (6), a Faraday rotary mirror (7), an eighth wave plate (8) on the Faraday rotary mirror (7), a second reflecting mirror (9), a grating pair (10), a second half-wave plate (11), a second wavelength division multiplexing collimator (12), a second pumping source (13) and an optical fiber (14); the output end of the first pump source (1) is connected with the wavelength division multiplexing input end of the first wavelength division multiplexing collimator (2), and the output end of the second pump source (13) is connected with the wavelength division multiplexing input end of the second wavelength division multiplexing collimator (12); the first reflecting mirror (5), the beam splitter (4), the polarization beam splitting cube (6), the Faraday rotary mirror (7), the eighth wave plate (8) and the second reflecting mirror (9) are sequentially and linearly arranged; the first half wave plate (3) is arranged between the collimation emergent end of the first wavelength division multiplexing collimator (2) and the beam splitter (4), and one end of the beam splitter (4) away from the first half wave plate (3) is used as a pulse laser emergent end of the fiber laser; the second half wave plate (11) is arranged between the collimation emergent end of the second wavelength division multiplexing collimator (12) and the polarization beam splitting cube (6); the tail fibers of the first wavelength division multiplexing collimator (2) and the tail fibers of the second wavelength division multiplexing collimator (12) are connected through optical fibers (14), wherein at least one of the tail fibers of the first wavelength division multiplexing collimator (12), the tail fibers of the second wavelength division multiplexing collimator (12) and the optical fibers (14) adopts polarization-maintaining gain fibers; the optical path of the fiber laser is also provided with a bandwidth limiting element for limiting bandwidth.
2. A high repetition rate compact industrial-scale mode-locked fiber laser according to claim 1, characterized in that the bandwidth limiting element is a grating pair (10) arranged between the polarizing beam splitting cube (6) and the second half-wave plate (11) or a bandpass filter (15) arranged between the first mirror (5) and the beam splitter (4).
3. A high repetition rate compact, industrial-scale mode-locked fiber laser according to claim 1, characterized in that the beam splitter (4) is a beam splitter plate or a beam splitter cube.
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| CN201710373470.6A CN106961067B (en) | 2017-05-24 | 2017-05-24 | High repetition frequency compact industrial mode-locked fiber laser |
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| CN201710373470.6A CN106961067B (en) | 2017-05-24 | 2017-05-24 | High repetition frequency compact industrial mode-locked fiber laser |
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| CN106961067B true CN106961067B (en) | 2023-05-16 |
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| CN107645118A (en) * | 2017-10-23 | 2018-01-30 | 北京大学 | A kind of Gao Zhongying optical fiber laser and control method based on phase bias device principle |
| CN110364923A (en) * | 2018-03-26 | 2019-10-22 | 雷小权 | A kind of full polarization fibre mode-locked laser based on phase bias |
| CN112310792B (en) * | 2020-10-27 | 2021-12-07 | 合肥脉锐光电技术有限公司 | Pulse separation laser oscillator |
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| US5365531A (en) * | 1992-11-24 | 1994-11-15 | Hewlett-Packard Company | Apparatus and method for initializing an optical-fiber laser for mode locking |
| EP2637265B1 (en) * | 2012-03-05 | 2018-08-29 | Menlo Systems GmbH | Laser with non-linear optical loop mirror |
| CN103022863A (en) * | 2012-12-11 | 2013-04-03 | 北京大学 | Ring cavity mode locking fiber laser |
| CN104979747B (en) * | 2015-07-21 | 2017-12-01 | 北京大学 | Integrated reflective phase bias device and optical fiber laser and light wave microwave phase discriminator |
| CN105048268B (en) * | 2015-08-26 | 2018-11-06 | 广东量泽激光技术有限公司 | A kind of optical fiber laser of integrated phase bias device and application integration phase bias device |
| CN206774870U (en) * | 2017-05-24 | 2017-12-19 | 广东量泽激光技术有限公司 | A kind of compact technical grade mode locked fiber laser of Gao Zhongying |
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Effective date of registration: 20220415 Address after: 528400 floors 1 and 2, No. 28, Yuquan Road, Torch Development Zone, Zhongshan City, Guangdong Province Applicant after: GUANGDONG HUAYI LASER TECHNOLOGY Co.,Ltd. Address before: 528400 301, floor 3, building 1, digital trade building, No. 6, Xiangxing Road, Torch Development Zone, Zhongshan City, Guangdong Province Applicant before: GUANGDONG LIANGZE LASER TECHNOLOGY Co.,Ltd. |
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