CN213026877U - Low-repetition-frequency erbium-doped femtosecond fiber laser - Google Patents
Low-repetition-frequency erbium-doped femtosecond fiber laser Download PDFInfo
- Publication number
- CN213026877U CN213026877U CN202022497228.XU CN202022497228U CN213026877U CN 213026877 U CN213026877 U CN 213026877U CN 202022497228 U CN202022497228 U CN 202022497228U CN 213026877 U CN213026877 U CN 213026877U
- Authority
- CN
- China
- Prior art keywords
- polarization
- maintaining
- coupler
- ring
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 49
- 239000013307 optical fiber Substances 0.000 claims abstract description 37
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 229910052691 Erbium Inorganic materials 0.000 claims description 4
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000010287 polarization Effects 0.000 description 7
- 230000010363 phase shift Effects 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000002041 carbon nanotube Substances 0.000 description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- -1 erbium ions Chemical class 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Landscapes
- Lasers (AREA)
Abstract
The utility model provides a low-repetition-frequency erbium-doped femtosecond fiber laser, which comprises an NALM ring, a main ring and a first coupler, wherein the NALM ring comprises a pumping source input end, a wavelength division multiplexer, a polarization-maintaining erbium-doped fiber and a first polarization-maintaining passive fiber, the first polarization-maintaining passive fiber is an annular main body of the NALM ring, and the pumping source input end, the wavelength division multiplexer and the polarization-maintaining erbium-doped fiber are all connected to the first polarization-maintaining passive fiber; the main ring comprises a polarization-maintaining isolator, a second coupler, an output end and a second polarization-maintaining passive optical fiber, wherein the second polarization-maintaining passive optical fiber is an annular main body of the main ring, the polarization-maintaining isolator and the second coupler are connected to the second polarization-maintaining passive optical fiber, and the output end is connected with the output end of the second coupler; a first coupler connects the NALM ring and the main ring. This laser instrument make full use of NALM ring carries out the mode locking, reduces the repetition frequency, and stability is high, and simple structure, the cost is reduced.
Description
Technical Field
The disclosure relates to the technical field of fiber lasers, in particular to a low-repetition-frequency erbium-doped femtosecond fiber laser.
Background
The existing femtosecond laser generally adopts a passive mode locking mode, and common mode locking modes comprise a Carbon Nanotube (CNT), a semiconductor saturable absorber mirror (SESAM) and a nonlinear polarization rotation effect (NPE). The Carbon Nano Tube (CNT) or the semiconductor saturable absorber mirror (SESAM) is adopted to belong to a material mode locking device, and the service life is certain; mode locking using nonlinear polarization rotation effect (NPE) can generally only be achieved in spatial light paths. The nonlinear optical fiber environment (NOLM) and the nonlinear optical fiber amplification environment (NALM) have the characteristics of good mode locking stability, long-term effectiveness and the like as mode locking devices due to the full optical fiber structures, and are relatively advanced femtosecond laser mode locking schemes.
At present, the mainstream femtosecond fiber laser has higher repetition frequency and is mainly used for a femtosecond optical frequency comb and a high-precision measurement and test system. The existing low repetition frequency femtosecond fiber laser mainly adopts the following schemes. Firstly, the repetition frequency is reduced by using a modulator, the instability of the structure is increased, large loss is introduced, and the structure is complex; secondly, NPE mode locking is adopted, a space optical path is generally adopted for realizing, the complexity of the system is increased, if an all-fiber structure is adopted, the influence of the polarization state is great, and the stability of the system is not high; thirdly, a two-stage pumping source is adopted, and an ytterbium-doped low-repetition-frequency femtosecond fiber laser is realized based on NALM, so that picosecond-magnitude laser pulse output is realized; fourthly, a two-stage pumping source is adopted, and the ytterbium-doped low-repetition-frequency femtosecond laser is realized based on the NOLM, so that the power consumption of the system is increased. The low repetition frequency femtosecond fiber laser increases the complexity and instability of the system to a certain extent and has higher manufacturing cost. And the optical device with the working waveband of 1550nm in the market is cheaper and more complete in variety, so that the 1550nm waveband femtosecond fiber laser can be better matched with other systems for use, and has higher compatibility. The low-repetition-frequency femtosecond fiber laser is an ytterbium-doped fiber laser, the compatibility with other systems is poor, and the development of the low-repetition-frequency femtosecond fiber laser with the 1550nm waveband is still vacant.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The present disclosure provides a low repetition frequency erbium-doped femtosecond fiber laser, which solves the problems of high repetition frequency, complex structure, poor stability, high power consumption, complex structure, poor compatibility, etc. of the existing low repetition frequency femtosecond fiber laser.
(II) technical scheme
The present disclosure provides a low-repetition frequency erbium-doped femtosecond fiber laser, which comprises an NALM ring, a main ring and a first coupler 5, and comprises: the NALM ring comprises a pumping source input end 1, a wavelength division multiplexer 2, a polarization-maintaining erbium-doped optical fiber 3 and a first polarization-maintaining passive optical fiber 4, wherein the first polarization-maintaining passive optical fiber 4 is an annular main body of the NALM ring, and the pumping source input end 1, the wavelength division multiplexer 2 and the polarization-maintaining erbium-doped optical fiber 3 are all connected to the first polarization-maintaining passive optical fiber; the main ring comprises a polarization-maintaining isolator 6, a second coupler 7, an output end 8 and a second polarization-maintaining passive optical fiber 9, wherein the second polarization-maintaining passive optical fiber 9 is an annular main body of the main ring, the polarization-maintaining isolator 6 and the second coupler 7 are connected to the second polarization-maintaining passive optical fiber 9, and the output end 8 is connected with an output end of the second coupler 7; the first coupler 5 connects the NALM ring and the main ring.
Preferably, the pump source input 1 is connected to a 980nm pump source.
Preferably, the wavelength division multiplexer 2 is a 980nm/1550nm wavelength division multiplexer.
Preferably, the first coupler 5 is a two-half coupler, and the splitting ratio is 50% to 50%.
Preferably, the second coupler 7 is a two-in-one coupler, and the splitting ratio is 20% to 80%, wherein 20% of the laser light in the main ring is output through the output end 8 after being split by the second coupler 7.
Preferably, the first polarization-maintaining passive optical fiber 4 has a length of 50 m.
Preferably, the length of the polarization-maintaining erbium-doped fiber 3 is 1.6 m.
(III) advantageous effects
The utility model provides a low-repetition-frequency erbium-doped femtosecond fiber laser, including NALM ring, main ring and first coupler 5, wherein, NALM ring has dual function, and one of them, NALM ring is the mode locking device, and the light in NALM ring is two-way spread, produces nonlinear phase shift and realizes the mode locking, and its two, first polarization-preserving passive optical fiber 4 that NALM contains is long optic fibre, and this long optic fibre can realize low repetition frequency, and in addition, the pump source that NALM ring used also is as the pump source of whole laser, but reduction system complexity and cost, this laser adopts full polarization-maintaining fiber structure, has increased the stability. The laser can realize 1550nm pulse with wide spectrum, femtosecond level and high single pulse energy, the pulse light in the wave band can be compatible with a subsequent system, pulse compression is further realized, and the laser can also be used as a seed source of a chirped pulse amplification system.
Drawings
Fig. 1 schematically illustrates a schematic diagram of a low-repetition-frequency erbium-doped femtosecond fiber laser provided by an embodiment of the present disclosure;
FIG. 2 schematically shows a spectrum of laser light generated by a low-repetition-frequency erbium-doped femtosecond fiber laser provided by the embodiment of the disclosure;
fig. 3 schematically illustrates a frequency spectrum diagram of laser pulses generated by a low-repetition-frequency erbium-doped femtosecond fiber laser provided by the embodiment of the disclosure;
FIG. 4 is a schematic diagram illustrating a time domain waveform of laser pulses generated by a low-repetition-frequency erbium-doped femtosecond fiber laser provided by the embodiment of the disclosure;
fig. 5 schematically shows a pulse width diagram of laser pulses generated by a low-repetition-frequency erbium-doped femtosecond fiber laser provided by the embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 schematically illustrates a schematic diagram of a low-repetition-frequency erbium-doped femtosecond fiber laser provided by an embodiment of the disclosure.
As shown in fig. 1, the present disclosure provides a low-repetition frequency erbium-doped femtosecond fiber laser including a NALM ring, a main ring, and a first coupler 5.
Specifically, the NALM ring comprises a pumping source input end 1, a wavelength division multiplexer 2, a polarization-maintaining erbium-doped optical fiber 3 and a first polarization-maintaining passive optical fiber 4, wherein the first polarization-maintaining passive optical fiber 4 is an annular main body of the NALM ring, and the pumping source input end 1, the wavelength division multiplexer 2 and the polarization-maintaining erbium-doped optical fiber 3 are all connected to the first polarization-maintaining passive optical fiber 4; the main ring comprises a polarization-maintaining isolator 6, a second coupler 7, an output end 8 and a second polarization-maintaining passive optical fiber 9, the second polarization-maintaining passive optical fiber 9 is an annular main body of the main ring, the polarization-maintaining isolator 6 and the second coupler 7 are connected to the second polarization-maintaining passive optical fiber 9, and the output end 8 is connected with the output end of the second coupler 7; a first coupler 5 connects the NALM ring and the main ring.
In the embodiment of the disclosure, the NALM ring is mainly used as a mode locking device, a pumping light source is input into the NALM ring through a pumping source input end 1, and is input into the main ring through a first coupler 5, and then is transmitted back into the NALM ring through the first coupler 5, and is divided into two types of light of forward transmission and reverse transmission to be transmitted in the NALM, because the time points of the forward transmission light and the reverse transmission light reaching the polarization maintaining erbium-doped fiber 3 are different, the polarization maintaining erbium-doped fiber 3 at different time points is amplified, because the input pumping light is superposed with the forward transmission light, the forward transmission light and the reverse transmission light generate light intensity difference, so that different nonlinear phase shifts are generated, different transmission characteristics are shown at the first coupler 5, and mode locking is realized.
In the disclosed embodiments, the pump source in which the gain is provided in a common laser is directly replaced by pump light in the NALM ring. The polarization maintaining isolator 6 is used for ensuring that the laser light propagating in the main ring is propagated in a single direction. The second coupler 7 divides the laser into two beams, wherein one beam is output through the second coupler 7, and the other beam returns to the main ring to form a closed loop, so that the laser is ensured to form a stable oscillation cavity.
In the embodiment of the present disclosure, the pump source input end 1 is connected to a 980nm pump source, and is configured to input 980nm pump light generated by the 980nm pump source into the NALM ring.
In the embodiment of the disclosure, 980nm pump light is input into the NALM ring and then converted into 1550nm laser through the polarization-maintaining erbium-doped fiber 3. The polarization-maintaining erbium-doped optical fiber 3 is provided with erbium ions, the erbium ions are excited from a low-energy-level state to a high-energy-level state after absorbing the pumping light and then rapidly relax to a ground state, namely the pumping light is used as photons 980nm for providing energy, and the photons 1550nm are emitted after the erbium-doped ions relax.
In the embodiment of the present disclosure, the wavelength division multiplexer 2 is a 980nm/1550nm wavelength division multiplexer, and is configured to couple 980nm pump light and 1550nm laser converted by the polarization-maintaining erbium-doped fiber 3, and laser returned from the main loop through the first coupler 5.
In the embodiment of the present disclosure, the first coupler 5 is used to transmit the light in the NALM ring to the main ring, and is used to transmit the laser light in the main ring to the NALM ring, wherein the laser light enters the NALM ring through the first coupler 5 in forward and reverse directions, respectively, the forward transmitted light and the reverse transmitted light are amplified by the polarization-maintaining erbium-doped fiber 3 in sequence to generate a nonlinear phase shift, and then the nonlinear phase shift is accumulated by the first polarization-maintaining passive fiber 4, and mode locking is realized at the first coupler 5.
Preferably, the first coupler 5 is a two-half coupler with a splitting ratio of 50% to 50%.
Preferably, the second coupler 7 is a two-in-one coupler, and the splitting ratio is 20% to 80%, wherein 20% of the laser light in the main loop is output through the output end 8 after being split by the second coupler 7.
Preferably, the first polarization maintaining passive fiber 4 has a length of 50 m. The 50m first polarization-maintaining passive optical fiber 4 can accumulate nonlinear phase shift generated in the transmission process, so that mode locking is facilitated, the cavity length of the laser is increased, and the repetition frequency is reduced.
Preferably, the length of the polarization-maintaining erbium-doped fiber 3 is 1.6 m.
Fig. 2 to 5 respectively schematically show a spectrogram, a time domain waveform diagram and a pulse width diagram of laser light generated by a low-repetition-frequency erbium-doped femtosecond fiber laser provided by an embodiment of the present disclosure.
When the input power of a 980nm pump source is 720mW, the laser realizes an automatic mode locking state, the pump power is reduced to 600mW, the stable mode locking state can still be kept, the mode locking center wavelength is 1584.352nm, the 3dB bandwidth of the spectrum is 33.7063nm, and the pulse width is 230 fs. The laser realizes a stable mode-locking state with the repetition frequency of 3.61MHz, the 20 percent output power is 31.8mW, and the single pulse energy is 8.8 nJ.
The low-repetition-frequency erbium-doped femtosecond fiber laser device has dual functions, wherein the NALM ring is a mode locking device, light in the NALM ring is bidirectionally transmitted to generate nonlinear phase shift and realize mode locking, and the first polarization-preserving passive optical fiber 4 contained in the NALM is a long optical fiber which can realize low repetition frequency. The laser can realize 1550nm pulse with wide spectrum, femtosecond level and high single pulse energy, and has more frequency components to further perform pulse width compression; the 20% output average power in the fiber oscillator is 31.8mW, the single pulse energy can reach 8.8nJ, and the fiber oscillator can be used as a seed light source for amplifying the chirped pulse. Meanwhile, mode-locked femtosecond pulse laser output with lower repetition frequency and higher single pulse energy can be realized by simply adjusting the length of the accessed passive optical fiber, and the system has good system expansion performance and a promotion space for outputting laser parameters.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A low repetition frequency erbium doped femtosecond fiber laser comprising a NALM ring, a main ring and a first coupler (5), comprising:
the NALM ring comprises a pumping source input end (1), a wavelength division multiplexer (2), a polarization-maintaining erbium-doped optical fiber (3) and a first polarization-maintaining passive optical fiber (4), wherein the first polarization-maintaining passive optical fiber (4) is an annular main body of the NALM ring, and the pumping source input end (1), the wavelength division multiplexer (2) and the polarization-maintaining erbium-doped optical fiber (3) are all connected to the first polarization-maintaining passive optical fiber (4);
the main ring comprises a polarization-maintaining isolator (6), a second coupler (7), an output end (8) and a second polarization-maintaining passive optical fiber (9), the second polarization-maintaining passive optical fiber (9) is an annular main body of the main ring, the polarization-maintaining isolator (6) and the second coupler (7) are connected to the second polarization-maintaining passive optical fiber (9), and the output end (8) is connected with the output end of the second coupler (7);
the first coupler (5) connects the NALM ring and the main ring.
2. A laser according to claim 1, characterized in that the pump source input (1) is also connected to a 980nm pump source.
3. A laser according to claim 1, wherein the wavelength division multiplexer (2) is a 980nm/1550nm wavelength division multiplexer.
4. A laser according to claim 1, characterized in that the first coupler (5) is a two-half coupler with a splitting ratio of 50%: 50 percent.
5. A laser according to claim 1, characterized in that the second coupler (7) is a two-in-one coupler with a splitting ratio of 20%: 80%, wherein 20% of the laser light in the main ring is output through the output end (8) after being split by the second coupler (7).
6. A laser according to claim 1, characterized in that the first polarization-maintaining passive fiber (4) has a length of 50 m.
7. A laser according to claim 1, characterized in that the polarization-maintaining erbium doped fiber (3) has a length of 1.6 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022497228.XU CN213026877U (en) | 2020-11-02 | 2020-11-02 | Low-repetition-frequency erbium-doped femtosecond fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022497228.XU CN213026877U (en) | 2020-11-02 | 2020-11-02 | Low-repetition-frequency erbium-doped femtosecond fiber laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213026877U true CN213026877U (en) | 2021-04-20 |
Family
ID=75482478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022497228.XU Active CN213026877U (en) | 2020-11-02 | 2020-11-02 | Low-repetition-frequency erbium-doped femtosecond fiber laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213026877U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271540A (en) * | 2020-11-02 | 2021-01-26 | 中国科学院微电子研究所 | Low-repetition-frequency erbium-doped femtosecond fiber laser |
-
2020
- 2020-11-02 CN CN202022497228.XU patent/CN213026877U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271540A (en) * | 2020-11-02 | 2021-01-26 | 中国科学院微电子研究所 | Low-repetition-frequency erbium-doped femtosecond fiber laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208093940U (en) | A kind of big energy optical fiber amplifier of the high power that repetition is tunable | |
| CN217984055U (en) | All-polarization-maintaining optical fiber dispersion management annular cavity mode-locked femtosecond ytterbium-doped optical fiber laser | |
| CN101083381A (en) | Semiconductor laser seed pulse main oscillation amplification all-fiber laser | |
| JP2009506560A (en) | Fiber laser | |
| CN112271540A (en) | Low-repetition-frequency erbium-doped femtosecond fiber laser | |
| CN218648325U (en) | All-fiber ring mirror laser capable of generating ultrashort pulses | |
| CN112600061A (en) | Tunable Raman fiber laser | |
| CN109904715A (en) | A kind of 1064nm self-locking mode polarization-maintaining ytterbium-doping optical fiber laser of low repetition | |
| CN102368585A (en) | High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser | |
| CN213026877U (en) | Low-repetition-frequency erbium-doped femtosecond fiber laser | |
| CN209993863U (en) | Low-repetition-frequency 1064nm self-mode-locking polarization-maintaining ytterbium-doped fiber laser | |
| CN107910735A (en) | The inclined mode locked fiber laser of all risk insurance based on a variety of soliton state outputs of chirped fiber Bragg grating | |
| CN109149328B (en) | Environmentally stable low-repetition-frequency linear cavity picosecond ytterbium-doped fiber laser | |
| CN114421271A (en) | All-fiber neodymium-doped fiber laser | |
| CN113131321B (en) | Low-threshold self-starting full-polarization-maintaining femtosecond fiber laser | |
| CN113745952A (en) | Hybrid mode-locked fiber laser generating high-order harmonic solitons with tunable repetition frequency | |
| CN212033416U (en) | All-fiber ultrafast laser based on polarization maintaining fiber cross fusion technology | |
| CN113206427A (en) | High repetition frequency linear polarization femtosecond mode-locked fiber laser | |
| CN209298558U (en) | A kind of hectowatt grade high power full polarization fiber amplifier | |
| CN113471799B (en) | Raman ultrafast fiber laser based on intracavity synchronous pumping | |
| CN110021871A (en) | A method of realizing Gao Zhongying Wavelength tunable all -fiber ultrafast pulsed laser device and system | |
| CN215070850U (en) | High repetition frequency linear polarization femtosecond mode-locked fiber laser | |
| CN110380324B (en) | Ultrashort pulse fiber laser | |
| CN208849224U (en) | THz high repetition frequency high power femto second optical fiber laser based on dispersive wave | |
| CN112260045A (en) | Short straight chamber self-modulation Q single-frequency pulse fiber laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |