CN116799599A - Pump laser reflection amplifying system - Google Patents
Pump laser reflection amplifying system Download PDFInfo
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- CN116799599A CN116799599A CN202310996562.5A CN202310996562A CN116799599A CN 116799599 A CN116799599 A CN 116799599A CN 202310996562 A CN202310996562 A CN 202310996562A CN 116799599 A CN116799599 A CN 116799599A
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- 239000000835 fiber Substances 0.000 claims abstract description 76
- 239000013307 optical fiber Substances 0.000 claims abstract description 20
- 230000003321 amplification Effects 0.000 claims description 19
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 12
- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical group [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 claims description 10
- 238000002310 reflectometry Methods 0.000 claims description 8
- 150000002500 ions Chemical class 0.000 claims description 7
- 229910052691 Erbium Inorganic materials 0.000 claims description 6
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 5
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 229910052775 Thulium Inorganic materials 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 4
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 238000005086 pumping Methods 0.000 description 8
- 230000002457 bidirectional effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- -1 thulium ions Chemical class 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
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Abstract
The invention relates to a pump laser reflection amplifying system, which comprises a seed light source, a pump light reflector, a doped gain optical fiber, a pump beam combiner, a multimode pump laser and a rear isolator, wherein the pump light reflector is connected between the seed light source and the doped gain optical fiber, the pump beam combiner is connected with the doped gain optical fiber, the output end of the multimode pump laser is connected with the pump beam combiner, and the rear isolator is connected with the pump beam combiner. The pump laser reflection amplifying system of the invention not only improves the stability of the fiber laser amplifier, but also greatly improves the OSNR of the fiber laser amplifier, improves the quality of output light, obviously improves the light conversion efficiency of the pump laser, and obtains output light with higher power.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to the field of amplification of a main oscillation power amplification structure, and specifically relates to a pump laser reflection amplification system.
Background
The fiber laser is essentially a wavelength converter that converts the pump wavelength into light of a specific wavelength and outputs it as laser light. The optical fiber is used as a guided wave medium, the diameter of the fiber core is small, and high power density is easy to form in the fiber, so that the optical fiber laser has higher conversion efficiency, lower threshold value, higher gain and narrower linewidth. In addition, the optical fiber has good flexibility, so the optical fiber laser has the characteristics of small and flexible size, compact structure, higher performance price and easy system integration.
At present, a pulse fiber laser generally adopts a MOPA (Master Oscillator Power Amplifier) structure for amplifying main oscillation power, and seed signal light and pump light with high beam quality are coupled into a double-clad fiber for amplification in a certain mode, so that high-power amplification of a seed light source is realized. The output light obtained by the MOPA technology has stable and variable time domain and frequency domain characteristics, and realizes high-power and high-energy output while maintaining good beam quality.
For pulsed lasers, power boosting relies mainly on single-stage or even multi-stage power amplifiers. The main factors considered when designing an amplifier include output average power, single stage gain, signal to noise ratio, and nonlinear effects. Amplifiers are classified into various configurations and classifications according to the transmission directions of pump laser and signal laser, and can be classified into forward pump amplifiers (pump is injected from the front end of the amplifier and transmitted in the same direction as the signal), reverse pump amplifiers (pump is injected from the rear end of the amplifier and transmitted in the opposite direction to the signal), and bidirectional pump amplifiers (pump is injected from both sides of the amplifier). The advantage of a reverse pump amplifier is that the pump conversion efficiency is high, but the OSNR (Optical Signal Noise Ratio, optical signal to noise ratio) is poor. In practical applications, how to consider conversion efficiency and OSNR index is the most important point. In addition, due to the limitation of the absorption efficiency of the erbium fiber, the leakage of the pumping light is unavoidable, the conversion efficiency of the pumping light is affected, and the improvement of the conversion efficiency is also important in this respect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the pump laser reflection amplifying system which has the advantages of simple structure, high conversion efficiency and wider application range.
In order to achieve the above object, the pump laser reflection amplifying system of the present invention is as follows:
the pump laser reflection amplifying system is mainly characterized by comprising a seed light source, a pump light reflector, a doped gain optical fiber, a pump beam combiner, a multimode pump laser and a rear isolator, wherein the pump light reflector is connected between the seed light source and the doped gain optical fiber, the pump beam combiner is connected with the doped gain optical fiber, the output end of the multimode pump laser is connected with the pump beam combiner, and the rear isolator is connected with the pump beam combiner; the seed light source emits a low-power laser light source with specific wavelength and specific bandwidth as signal light; the pump light reflector is used for reflecting the pump light which is not completely absorbed by the gain fiber; the doped gain fiber is used for amplifying the laser gain of the seed light source entering the gain fiber, converting the energy of the entering pump light into the wavelength of the required signal light in a stimulated radiation mode, the pump beam combiner is used for coupling the pump light into the doped gain fiber, the multimode pump laser is used for generating the pump light to excite the doped ions in the doped gain fiber, and the rear isolator is used for enabling the optical signal to be transmitted forward only.
Preferably, the seed light source is internally packaged with a bipolar isolator for isolating reflected light, and the bipolar isolator is used for isolating the reflected light and only allowing the seed light source laser to transmit unidirectionally so as to prevent the back light at the amplifying stage end from entering the seed light source.
Preferably, the wavelength of the pulse signal provided by the seed light source is 1.3 μm or 1.5 μm.
Preferably, the pump light reflector is coated with an antireflection film at the tail end, wherein the antireflection film has low reflectivity relative to the wavelength of the signal light and high reflectivity relative to the wavelength of the pump light.
Preferably, the doped gain fiber is erbium-ytterbium co-doped gain fiber or ion doped gain fiber comprising erbium doped, ytterbium doped and thulium doped.
Preferably, the multimode pump laser provides pump light in 930-980nm or 1480 nm.
By adopting the pump laser reflection amplifying system, the pump light which is not completely absorbed by the gain fiber for the first time is reflected back through the pump reflecting device, the signal light which is generated by the seed light source and is coupled into the gain fiber is amplified again in a forward pump amplifying mode, and the bidirectional amplification of the gain fiber is completed by using only one pump. Compared with the conventional reverse fiber laser amplifier, the pump leakage light wasted before is reused, so that the stability of the fiber laser amplifier is improved, the OSNR of the fiber laser amplifier is greatly improved, and the quality of output light is improved. Meanwhile, the pump light is firstly coupled into the gain fiber from the reverse direction and then the forward direction, so that the light conversion efficiency of the pump laser is obviously improved, and under the condition of the same pump current, the same doping concentration and the same length of gain fiber, the output light with higher power can be obtained. In addition, the number of optical devices is not changed from that of the conventional fiber laser amplifier, and the miniaturization of the obtained laser light source is not affected. In short, compared with the conventional fiber laser amplifier, the output light with better quality and larger power is obtained without changing the size and the number of the fiber laser amplifiers and without changing the power consumption.
Drawings
Fig. 1 is a schematic diagram of a pump laser reflection amplifying system according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
The pump laser reflection amplifying system comprises a seed light source, a pump light reflector, a doped gain optical fiber, a pump beam combiner, a multimode pump laser and a rear isolator, wherein the pump light reflector is connected between the seed light source and the doped gain optical fiber, the pump beam combiner is connected with the doped gain optical fiber, the output end of the multimode pump laser is connected with the pump beam combiner, and the rear isolator is connected with the pump beam combiner; the seed light source emits a low-power laser light source with specific wavelength and specific bandwidth as signal light; the pump light reflector is used for reflecting the pump light which is not completely absorbed by the gain fiber; the doped gain fiber is used for amplifying the laser gain of the seed light source entering the gain fiber, converting the energy of the entering pump light into the wavelength of the required signal light in a stimulated radiation mode, the pump beam combiner is used for coupling the pump light into the doped gain fiber, the multimode pump laser is used for generating the pump light to excite the doped ions in the doped gain fiber, and the rear isolator is used for enabling the optical signal to be transmitted forward only.
As a preferred embodiment of the invention, the seed light source is internally packaged with a bipolar isolator for isolating reflected light, and the bipolar isolator is used for isolating the reflected light and only allowing the laser of the seed light source to unidirectionally transmit, so that the back light of the amplifying stage end is prevented from entering the seed light source.
As a preferred embodiment of the invention, the wavelength of the pulse signal provided by the seed light source is 1.3 μm or 1.5 μm.
As a preferred embodiment of the invention, the pump light reflector is coated with an antireflection film at the tail end, wherein the antireflection film has low reflectivity relative to the wavelength of the signal light and high reflectivity relative to the wavelength of the pump light.
As a preferred embodiment of the invention, the doped gain fiber is an erbium-ytterbium co-doped gain fiber or an ion doped gain fiber comprising erbium doped, ytterbium doped and thulium doped.
As a preferred embodiment of the present invention, the multimode pump laser provides pump light in 930-980nm band or 1480nm band.
In a specific embodiment of the invention, a novel pump light reflector, a design method of a laser/amplifier of the novel pump light reflector and a product device are provided, the novel pump light reflector can be used as a miniaturized pulse light source, and the pump conversion efficiency is improved on the premise of ensuring good OSNR index.
The pump light reflector and the laser/amplifier thereof consist of a seed light source with a bipolar isolator, a pump light reflector, a doped gain fiber, a pump beam combiner, a multimode pump laser and a post isolator.
The scheme is shown in the figure, and specifically comprises the following optical devices:
1. seed light source with bipolar separator:
in a conventional optical path, a seed light source without an isolator is usually used as a signal light output, and in order to prevent reflected light from damaging the seed light source, a bipolar isolator device is required to be added separately to isolate the reflected light, and meanwhile, the bipolar isolator device is required to isolate leaked unused pump light. The addition of a single device affects the spatial dimensions of the overall laser amplifier device. And the bipolar isolator is packaged inside the seed light source, so that the space size can be effectively reduced under the same using condition.
The bipolar isolator is packaged in the seed light source, so that one device is reduced, and the space size of a product is saved; the seed light source is used for emitting a low-power laser light source with specific wavelength and specific bandwidth as signal light, and the wavelength is generally 1.5 mu m; the bipolar isolator is used for isolating reflected light, only allows the seed light source to transmit laser unidirectionally, and prevents the back light of the amplifying stage end from entering the seed light source, so that the seed light source is invalid.
After the seed light source is modulated by the circuit output signal, pulse signal light with corresponding pulse width and frequency can be generated. The wavelength of the pulse signal provided by the seed light source is 1.3 μm or 1.5 μm. The seed light source is internally packaged with a bipolar isolator for isolating reflected light, so that the quality of the amplifier is ensured, and the space size is saved.
2. Pump light reflector device: the pumping reflection device is coated with an antireflection film with low reflectivity for signal light wavelength and high reflectivity for pumping light wavelength at the tail end of the device, so that pumping leakage light is better reflected back to a light path, and the normal operation of the optical fiber laser is not affected due to no reflection for the signal light; the pump reflecting device is used for reflecting the pump light which is not completely absorbed by the gain fiber. Under the condition that the power consumption is not changed, the pump conversion efficiency is improved.
3. Doped gain fiber: the laser gain of the seed light source entering the gain fiber is amplified, and the energy of the entering pump light is converted into the wavelength of the required signal light in a stimulated radiation mode. The doped gain fiber is usually erbium-ytterbium co-doped gain fiber, and further comprises erbium-doped, ytterbium-doped, thulium-doped plasma doped gain fiber.
4. Pump beam combiner: coupling pump light into the doped gain fiber;
5. multimode pump laser: pump light is generated to excite doped ions in the gain fiber, such as erbium particles, ytterbium particles, thulium ions, and the like. Multimode pump lasers are used to provide pump light in the 930-980nm band or 1480 nm.
6. Post-isolator: the reflected light is prevented from affecting the working stability of the optical amplifier, and the device which can only transmit the optical signal in the forward direction is ensured not to be affected by the backward scattered light.
The whole structure composed of erbium-ytterbium co-doped gain fiber, pump beam combiner and multimode pump laser can be called as fiber amplifier. The optical fiber amplifier is in a one-stage or multi-stage amplifier structure. The optical fiber amplifier is of a reverse pumping amplifying structure.
The pulse seed light source outputs 1550nm, 4ns pulse width and 500Hz low-power signal light, the low-power signal light is input into the pumping light reflector after passing through the internal bipolar isolator, and then enters the erbium-ytterbium co-doped gain fiber through the fusion point. Meanwhile, the output pump light of the 940nm multimode pump laser enters the erbium-ytterbium co-doped gain fiber through a beam combiner behind the erbium-ytterbium co-doped gain fiber, and reverse pumping amplification is carried out on the gain fiber. The 940nm pump light excites erbium ions and ytterbium ions of the baseband to a high energy state, so that the particle number is reversed, stimulated radiation is generated, and the 1550nm pulse signal light is amplified. Part of the unused pump light enters the pump light reflector from back to front, the residual pump light is reflected again and enters the erbium-ytterbium co-doped gain fiber from the front, and the pulse signal light of 1550nm is amplified again in the erbium-ytterbium co-doped gain fiber. The amplified 1550nm high-power output light then enters a post isolator which prevents reflected light from affecting the operational stability of the optical amplifier. Finally, the high-power output light with good signal light quality and consistent with the wavelength, pulse width and frequency of the seed light source is obtained through the output of the optical fiber jumper with the same wavelength. The type and the fiber length of the gain fiber are not changed, the power consumption of the fiber laser amplifier is not improved, the conversion efficiency of the pump light is improved, the gain amplification of the fiber is realized to the maximum, and the output light with high quality and high energy is obtained.
The technical proposal adds pulse signal light with the wavelength of 1.3 mu m or 1.5 mu m, namely a seed light source with a double-stage isolator. And stable pulse signal light is provided for the whole light path, so that the quality of the signal light is ensured, and the whole space size is reduced.
The technical scheme can select a high-power pump laser with the wavelength of 940nm and a pump laser with the wavelength of 1480 nm.
The technical scheme comprises, but is not limited to, single-stage amplification, and is applicable to double-stage amplification, three-stage amplification and even more stages of amplification.
The pump laser and the signal laser are distinguished according to the transmission directions, and can be divided into a forward pump amplifier (the pump is injected from the front end of the amplifier and transmits in the same direction with the signal) and a reverse pump amplifier (the pump is injected from the rear end of the amplifier and transmits in the reverse direction with the signal). The technical scheme selects reverse amplification. In contrast, the experimental scheme has higher pump conversion efficiency.
The positions of the pump light reflectors are different because the signal light amplification modes are different. Before the amplifier structure, the pump light reflector in the experimental scheme corresponds to the pump light reflector with better reflection efficiency, otherwise, the amplification of the whole light path is influenced.
The specific implementation manner of this embodiment may be referred to the related description in the foregoing embodiment, which is not repeated herein.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "plurality" means at least two.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
By adopting the pump laser reflection amplifying system, the pump light which is not completely absorbed by the gain fiber for the first time is reflected back through the pump reflecting device, the signal light which is generated by the seed light source and is coupled into the gain fiber is amplified again in a forward pump amplifying mode, and the bidirectional amplification of the gain fiber is completed by using only one pump. Compared with the conventional reverse fiber laser amplifier, the pump leakage light wasted before is reused, so that the stability of the fiber laser amplifier is improved, the OSNR of the fiber laser amplifier is greatly improved, and the quality of output light is improved. Meanwhile, the pump light is firstly coupled into the gain fiber from the reverse direction and then the forward direction, so that the light conversion efficiency of the pump laser is obviously improved, and under the condition of the same pump current, the same doping concentration and the same length of gain fiber, the output light with higher power can be obtained. In addition, the number of optical devices is not changed from that of the conventional fiber laser amplifier, and the miniaturization of the obtained laser light source is not affected. In short, compared with the conventional fiber laser amplifier, the output light with better quality and larger power is obtained without changing the size and the number of the fiber laser amplifiers and without changing the power consumption.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (6)
1. The pump laser reflection amplifying system is characterized by comprising a seed light source, a pump light reflector, a doped gain optical fiber, a pump beam combiner, a multimode pump laser and a rear isolator, wherein the pump light reflector is connected between the seed light source and the doped gain optical fiber, the pump beam combiner is connected with the doped gain optical fiber, the output end of the multimode pump laser is connected with the pump beam combiner, and the rear isolator is connected with the pump beam combiner; the seed light source emits a low-power laser light source with specific wavelength and specific bandwidth as signal light; the pump light reflector is used for reflecting the pump light which is not completely absorbed by the gain fiber; the doped gain fiber is used for amplifying the laser gain of the seed light source entering the gain fiber, converting the energy of the entering pump light into the wavelength of the required signal light in a stimulated radiation mode, the pump beam combiner is used for coupling the pump light into the doped gain fiber, the multimode pump laser is used for generating the pump light to excite the doped ions in the doped gain fiber, and the rear isolator is used for enabling the optical signal to be transmitted forward only.
2. The pump laser reflection amplifying system according to claim 1, wherein the seed light source is internally packaged with a bipolar isolator for isolating reflected light, and the bipolar isolator is used for isolating reflected light and only allowing the laser of the seed light source to transmit unidirectionally, so that the back light at the amplifying stage end is prevented from entering the seed light source.
3. The pump laser reflection amplification system of claim 1, wherein the pulsed signal provided by the seed light source has a wavelength of 1.3 μm or 1.5 μm.
4. The pump laser reflection amplification system of claim 1, wherein the pump light reflector is coated with an anti-reflection film at the end, the anti-reflection film having a low reflectivity with respect to the wavelength of the signal light and a high reflectivity with respect to the wavelength of the pump light.
5. The pump laser reflection amplifying system according to claim 1, wherein the doped gain fiber is an erbium ytterbium co-doped gain fiber or an ion doped gain fiber including erbium doped, ytterbium doped, thulium doped.
6. The pump laser reflection amplification system of claim 1, wherein the multimode pump laser provides pump light in the 930-980nm band or 1480nm band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310996562.5A CN116799599A (en) | 2023-08-09 | 2023-08-09 | Pump laser reflection amplifying system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310996562.5A CN116799599A (en) | 2023-08-09 | 2023-08-09 | Pump laser reflection amplifying system |
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| CN202310996562.5A Pending CN116799599A (en) | 2023-08-09 | 2023-08-09 | Pump laser reflection amplifying system |
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