CN203288931U - High power optical fiber laser and optical fiber amplifier - Google Patents
High power optical fiber laser and optical fiber amplifier Download PDFInfo
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- CN203288931U CN203288931U CN2013203213320U CN201320321332U CN203288931U CN 203288931 U CN203288931 U CN 203288931U CN 2013203213320 U CN2013203213320 U CN 2013203213320U CN 201320321332 U CN201320321332 U CN 201320321332U CN 203288931 U CN203288931 U CN 203288931U
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Abstract
The utility model discloses a high power optical fiber laser and an optical fiber amplifier. The optical fiber amplifier comprises a pump laser, a pump signal laser beam combiner, a gain optical fiber and at least one optical isolator. The optical fiber amplifier is characterized in that the optical isolator is an all-fiber Faraday optical rotation isolator and comprises a first optical fiber polarizer, a magnetic sensitive optical fiber and a second optical fiber polarizer, wherein an outgoing end of the first optical fiber polarizer is in welding connection with an incoming end of the magnetic sensitive optical fiber, and an outgoing end of the magnetic sensitive optical fiber is in welding connection with an incoming end of the second optical fiber polarizer; and the incoming end of the first optical fiber polarizer and the outgoing end of the second optical fiber polarizer are in welding connection with adjacent optical fibers respectively. The high power optical fiber laser and the optical fiber amplifier have high reliability, and solve a problem of power restriction in the prior art. Output laser power greatly exceeds output laser power of an existing optical fiber amplifier.
Description
Technical field
The utility model relates to a kind of fiber laser, and the fiber amplifier that is used for fiber laser, especially a kind of laser fiber amplifier that can bear high power laser light.
Background technology
The high power optical fibre laser technology is active research direction of international laser technology field in recent years.Compare the laser technology of the media such as conventional solid, gas, semiconductor, but fiber laser has good beam quality, the advantages such as efficiency is high, light, stability and reliability is good, the high total solids semiconductor laser pumping of power output.This LASER Light Source is applicable to the fields such as laser radar, the processing of material precise laser, precision photolithography, space laser communication, laser remote sensing.Usually, average power is called high-capacity optical fiber laser greater than the fiber laser of 10 watts.
Operation principle and characteristics according to fiber laser, usually high-capacity optical fiber laser is comprised of low-power seed laser and single-stage or multi-stage fiber amplifier, adopt oscillator-power-amplifier stage mode of operation, the low-power seed laser is amplified to predetermined laser power (concrete progression is by the amplifying laser power decision).Because optical fiber has the higher characteristics of gain, for preventing that the gain coupling between fiber amplifiers at different levels from producing the laser concussion that forms between amplifying stage, must place optical isolator between fiber amplifiers at different levels (comprising seed laser and follow-up amplifying stage), with guarantee laser unidirectional by and do not form Multi reflection and form laserresonator.Avoid because the gain coupling produces the laserresonator generation high power laser light that Multi reflection forms, thereby destroy the fiber optic component and device in high-power fiber amplifier.In the high-capacity optical fiber laser use procedure; the back reflection laser of reflecting surface of coming from the outside can oppositely enter in high-capacity optical fiber laser by the optic system for outputting of fiber laser; thereby destroy the fiber optic component in the high-capacity optical fiber laser resonant cavity, so also need to use isolator with the protection high-capacity optical fiber laser at the output port of high-capacity optical fiber laser.
General every one-level fiber amplifier is by comprising that optical isolator, pumping and the components and parts such as signal laser bundling device, gain fibre form.Signal laser, from entrance point incident, enters gain fibre after optical isolator, pumping and signal laser bundling device, signal laser amplifies in gain fibre.Optical isolator stops any reciprocal light to enter in upper level amplifier or seed laser on the one hand, can effectively prevent on the other hand this one-level amplifier and from the prime reflecting surface, form laser cavity.Pumping and signal laser bundling device import pumping laser into optical fiber.Pumping laser can be the single mode pumping laser, can be also the multimode pumping laser, is converted into the energy of signal laser after pumping laser is absorbed by gain fibre, so signal laser is amplified, and from the port of export, exports.
Before optical isolator generally is placed on pumping and signal laser bundling device so that the pumping laser transmission.But, tending to incide reflecting surface after the output of optical-fiber laser signal, laser is reflected back toward fiber laser cavity.Therefore, isolator is placed on the port of export of fiber amplifier sometimes.Certainly optical isolator also can be placed on entrance point and the port of export simultaneously.
For realizing above-mentioned fiber amplifier, in prior art, the optical isolator of employing is all generally the free space fibre-optical coupling.As shown in Figure 1, be the structural representation of existing optical isolator.Laser in incident optical becomes collimation laser through first lens, and collimation laser enters Faraday polarization apparatus after the first Laser polarizers, and polarization direction enters the second Laser polarizers after being rotated 45 degree.The polarization angle of the second Laser polarizers and the first Laser polarizers differs 45 degree.And then, by the second lens focus, enter outgoing optical fiber.In said structure, there is air in the gap between each element of optical isolator.Return back out while penetrating optical fiber when laser beam is focused, spot size is very little, usually less than 20 microns., if it is improper that the relative position of lens and optical fiber slightly has, will cause optical fiber to damage.Therefore the laser of the optical isolator of present nearly all free space fibre-optical coupling is not more than 20 watts by power.That is to say that the laser power of fiber amplifier is subject to the restriction of this element of optical isolator.
At present, worked out magnetosensitive optical fiber, it has good light transmission and Faraday under the effect of external magnetic field, and the adapted polarizer can be made into optical isolator.But this magnetosensitive optical fiber only can substitute the Faraday polarization apparatus in said structure, need to be used in conjunction with polarizer, still by lens laser coupled to outgoing optical fiber.
Summary of the invention
Goal of the invention of the present utility model is to provide a kind of high power laser light fiber amplifier,, by architecture advances, solves in prior art and assembles owing to being subject to optical isolator the Power Limitation problem that large, the flimsy defect of difficulty causes.
Another goal of the invention of the present utility model is to provide a kind of high-capacity optical fiber laser that uses this fiber amplifier.
To achieve the above object of the invention, the technical solution adopted in the utility model is: a kind of high power laser light fiber amplifier, comprise pump laser, pump signal laser bundling device, gain fibre and at least one optical isolator, the output of described pump laser is connected to the input of pump signal laser bundling device, and the output of pump signal laser bundling device is connected to the input of gain fibre; Described optical isolator is full optical fiber Faraday isolator, comprise the first fibre optic polarizer, magnetosensitive optical fiber and the second fibre optic polarizer, the exit end of described the first fibre optic polarizer is connected with the incident end welding of magnetosensitive optical fiber, and the exit end of described magnetosensitive optical fiber is connected with the incident end welding of the second fibre optic polarizer; The incident end of the first fibre optic polarizer be connected the exit end of fibre optic polarizer and be connected with adjacent fused fiber splice respectively.
In technique scheme, before described optical isolator is arranged on pump signal laser bundling device, the output optical fibre of previous stage is connected with the incident end welding of the first fibre optic polarizer of described optical isolator, and the exit end of the second fibre optic polarizer of described optical isolator is connected with the signal input part fused fiber splice of pump signal laser bundling device.The previous stage output optical fibre that connects the laser fiber amplifier can be the output optical fibre of seed laser light source, can be also the output optical fibre of previous stage fiber amplifier.
Perhaps, after described optical isolator is arranged on gain fibre, the exit end of described gain fibre is connected with the incident end welding of the first fibre optic polarizer of described optical isolator, and the exit end of the second fibre optic polarizer of described optical isolator is connected with the input optical fibre welding of rear one-level.The input optical fibre of described rear one-level can refer to the input of rear one-level amplifier, also can refer to the input of outgoing optical fiber.
Perhaps, be respectively arranged with optical isolator before pump signal laser bundling device He after gain fibre.
Adopt technique scheme, fiber amplifier, without any free space, does not namely pass through air, vacuum or other any gas from input to output in optical fiber, and the fibre core of optical fiber is connected always, thereby has broken through Power Limitation.
The performance of the fiber amplifier of technique scheme is: when input during with optical isolator, the average power of input light can be greater than 20W, at this moment the power decision of output is in the multiplication factor of amplifier, when amplifying 20 decibels, the average output power of fiber amplifier output can be greater than 2000 watts.During with optical isolator, the average power of output can be greater than 20W when output.Laser can be continuous, can be also pulse.Wavelength can be from 0.4 micron to 10 microns.
For realizing another goal of the invention of the present utility model, the technical scheme of employing is, a kind of fiber laser, comprise the seed laser light source, described seed laser light source is fiber laser light source, with described seed laser light source, is connected, and is provided with the above-mentioned laser fiber amplifier of one-level at least.
Because technique scheme is used, the utility model compared with prior art has following advantages:
1. the utility model adopts the isolator of full optical fiber Faraday isolator as the different inter-stages of fiber amplifier or output, has advantages of high reliability;
2. in full optical fiber Faraday isolator of the present utility model, directly connect through welding between each element optical fiber, there are not air, vacuum or other any gas, thereby do not need to use lens focus to aim at, solved the problem of Power Limitation in the prior art, Output of laser power can be well beyond the Output of laser power of existing fiber amplifier.
Description of drawings
Fig. 1 is the structural representation of optical isolator in prior art.
Fig. 2 is the structural representation of embodiment one.
Fig. 3 is the structural representation of embodiment two.
Fig. 4 is the structural representation of embodiment three.
Fig. 5 is the structural representation of optical isolator in embodiment.
Wherein: 1, optical isolator; 2, pump signal laser bundling device; 3, pump laser; 4, gain fibre; 1-01, the first optical isolator; 1-02, the second optical isolator; 5, the first fibre optic polarizer; 6, magnetosensitive optical fiber; 7, the second fibre optic polarizer.
Embodiment
Below in conjunction with drawings and Examples, utility model is further described:
Embodiment one: shown in accompanying drawing 2, a kind of high power laser light fiber amplifier, comprise pump laser 3, pump signal laser bundling device 2, gain fibre 4 and an optical isolator 1, and described optical isolator 1 is full optical fiber Faraday isolator.Seed laser light source from prime is connected by fused fiber splice with the incident end optical fiber of optical isolator 1, seed laser enters in optical isolator 1, the optical isolator 1 unidirectional low-loss of assurance seed laser is passed through, reverse laser from rear class is stopped by optical isolator 1, and can not enter pre-amplifier or seed light source; Be connected by fused fiber splice between the signal input part optical fiber of the laser output optical fiber of optical isolator 1 and a pump signal laser bundling device 2, seed laser is by pump signal laser bundling device 2; The output optical fiber of a pump laser 3 is connected by the low loss fiber welding with the pumping laser input end fiber of pump signal laser bundling device 2, and pumping laser enters in pump signal laser bundling device 2; What the seed laser by pump signal laser bundling device 2 and pumping laser entered pump signal laser bundling device 2 closes bundle end optical fiber, the input end fiber of one section gain fibre 4 is connected by fused fiber splice with the bundle end optical fiber that closes of pump signal laser bundling device 2, and seed laser and pumping laser enter in gain fibre 4; The pumping laser that enters gain fibre 4 is absorbed by gain fibre 4, and seed laser obtains gain and amplifies in gain fibre 4; Laser after amplification is from gain fibre 4 another port outputs; Adopt the fiber amplifier of this structure, the average power of its 1064 nanometer input seed laser can be greater than 20 watts, at this moment the laser power of output is decided by the multiplication factor of amplifier, and when amplifying 20 decibels, the average output power of fiber amplifier output can be greater than 2000 watts.Laser can be continuous, can be also pulse.
Shown in accompanying drawing 5, optical isolator is connected and composed by the first fibre optic polarizer 5, magnetosensitive optical fiber 6, the second fibre optic polarizer 7 weldings.
Embodiment two: shown in accompanying drawing 3, a kind of high power laser light fiber amplifier, comprise pump laser 3, pump signal laser bundling device 2, gain fibre 4 and an optical isolator 1, and described optical isolator 1 is full optical fiber Faraday isolator.Be connected by fused fiber splice between signal input part optical fiber from 1 micron seed signal LASER Light Source output optical fiber of prime and 975 nanometers/1064 nanometer pumping signal laser bundling devices 2,1 micron seed laser enters in pump signal laser bundling device 2, and 1 micron seed laser is by pump signal laser bundling device 2; The output optical fiber of 975 nanometer high power pump laser 3 is connected by fused fiber splice with the pumping laser input end fiber of pump signal laser bundling device 2, and 975 nanometer high power pump laser enter in pump signal laser bundling device 2; What the seed laser by pump signal laser bundling device 2 and 975 nanometer high power pump laser entered pump signal laser bundling device 2 closes bundle end optical fiber, one section input end fiber of mixing ytterbium gain fibre 4 is connected by fused fiber splice with the bundle end optical fiber that closes of pump signal laser bundling device 2, and seed laser and 975 nanometer high power pump laser enter to be mixed in ytterbium gain fibre 4; Enter the 975 nanometer high power pump laser of mixing ytterbium gain fibre 4 and mixed 4 absorptions of ytterbium gain fibre, 1 micron seed laser obtains gain and amplifies in mixing ytterbium gain fibre 4; The output optical fiber of mixing ytterbium gain fibre 4 is connected by fused fiber splice with the input end fiber of optical isolator 1,1 micron seed laser after amplification enters the next stage fiber amplifier or directly output use from the output output of optical isolator 1, optical isolator 1 guarantees to amplify rear 1 micron unidirectional low-loss of high power seed laser to be passed through, the reverse laser outer from rear class fiber amplifier or high-power fiber amplifier stopped by optical isolator 1, and can not enter in fiber amplifier at the corresponding levels or 1 micron seed light source; Adopt the high-power fiber amplifier output of this structure with optical isolator, the average laser power of output can be greater than 20W.Laser can be continuous, can be also pulse.
Embodiment three: shown in accompanying drawing 4, a kind of high power laser light fiber amplifier, comprise pump laser 3, pump signal laser bundling device 2, gain fibre 4, the first optical isolator 1-01 and the second optical isolator 1-02, described the first optical isolator 1-01 and the second optical isolator 1-02 are full optical fiber Faraday isolators.1 micron seed laser light source from the prime fiber amplifier is connected by fused fiber splice with the input end fiber 1 between the first optical isolator 1-01,1 micron seed laser enters in the first optical isolator 1-01,1 micron unidirectional low-loss of seed laser of the first optical isolator 1-01 assurance is passed through, reverse laser from rear class is stopped by the first optical isolator 1-01, and can not enter pre-amplifier or seed light source; Be connected by fused fiber splice between the signal input part optical fiber of the laser output optical fiber of the first optical isolator 1-01 and 975 nanometers/1064 nanometer pumping signal laser bundling devices 2,1 micron seed laser is by pump signal laser bundling device 2; The output optical fiber of 975 nanometer high power pump laser 3 is connected by fused fiber splice with the pumping laser input end fiber of pump signal laser bundling device 2, and 975 nanometer high power pump laser enter in pump signal laser bundling device 2; What 1 micron seed laser by pump signal laser bundling device 2 and 975 nanometer high power pump laser entered pump signal laser bundling device 2 closes bundle end optical fiber, one section input end fiber of mixing ytterbium gain fibre 4 is connected by fused fiber splice with the bundle end optical fiber that closes of pump signal laser bundling device 2, and 1 micron seed laser and 975 nanometer high power pump laser enter to be mixed in ytterbium gain fibre 4; Enter the 975 nanometer high power pump laser of mixing ytterbium gain fibre 4 and mixed 4 absorptions of ytterbium gain fibre, 1 micron seed laser obtains gain and amplifies in mixing ytterbium gain fibre 4; 1 micron seed laser after amplification is from mixing 4 another port outputs of ytterbium gain fibre; The output optical fiber of mixing ytterbium gain fibre 4 is connected by fused fiber splice with the input end fiber of the second optical isolator 1-02,1 micron seed laser after amplification enters the next stage fiber amplifier or directly output use from the output output of the second optical isolator 1-02, the second optical isolator 1-02 guarantees to amplify rear 1 micron unidirectional low-loss of high power seed laser to be passed through, the reverse laser outer from rear class fiber amplifier or high-power fiber amplifier stopped by the second optical isolator 1-02, and can not enter in fiber amplifier at the corresponding levels or 1 micron seed light source; Laser can be continuous, can be also pulse.Wavelength can be from 0.4 micron to 10 microns.
embodiment four: a kind of 1 micron high-capacity optical fiber laser that adopts full optical fiber Faraday isolator, the annexation of each several part is: from 1 micron high-capacity optical fiber laser output optical fiber, with the input end fiber of full optical fiber Faraday isolator, by fused fiber splice, be connected, 1 micron high power rate fiber laser Output of laser enters in full optical fiber Faraday isolator, 1 micron unidirectional low-loss of high-capacity optical fiber laser Output of laser of full optical fiber Faraday isolator assurance is passed through, the back reflection laser of reflecting surface of coming from the outside is stopped by full optical fiber Faraday isolator, and can not enter in 1 micron high-capacity optical fiber laser, laser by full optical fiber Faraday isolator output optical fiber is exported after by optical coupling system, exports 1 micron laser greater than 20 watts.
Claims (5)
1. laser fiber amplifier, comprise pump laser, pump signal laser bundling device, gain fibre and at least one optical isolator, the output of described pump laser is connected to the input of pump signal laser bundling device, and the output of pump signal laser bundling device is connected to the input of gain fibre; It is characterized in that: described optical isolator is full optical fiber Faraday isolator, comprise the first fibre optic polarizer, magnetosensitive optical fiber and the second fibre optic polarizer, the exit end of described the first fibre optic polarizer is connected with the incident end welding of magnetosensitive optical fiber, and the exit end of described magnetosensitive optical fiber is connected with the incident end welding of the second fibre optic polarizer; The incident end of the first fibre optic polarizer be connected the exit end of fibre optic polarizer and be connected with adjacent fused fiber splice respectively.
2. laser fiber amplifier according to claim 1, it is characterized in that: before described optical isolator is arranged on pump signal laser bundling device, the output optical fibre of previous stage is connected with the incident end welding of the first fibre optic polarizer of described optical isolator, and the exit end of the second fibre optic polarizer of described optical isolator is connected with the signal input part fused fiber splice of pump signal laser bundling device.
3. laser fiber amplifier according to claim 1, it is characterized in that: after described optical isolator is arranged on gain fibre, the exit end of described gain fibre is connected with the incident end welding of the first fibre optic polarizer of described optical isolator, and the exit end of the second fibre optic polarizer of described optical isolator is connected with the input optical fibre welding of rear one-level.
4. according to claim 1,2 or 3 described laser fiber amplifiers, is characterized in that: be respectively arranged with optical isolator before pump signal laser bundling device He after gain fibre.
5. a fiber laser, comprise the seed laser light source, it is characterized in that: described seed laser light source is fiber laser light source, with described seed laser light source, is connected, and is provided with one-level laser fiber amplifier claimed in claim 1 at least.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203213320U CN203288931U (en) | 2013-06-05 | 2013-06-05 | High power optical fiber laser and optical fiber amplifier |
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| CN2013203213320U CN203288931U (en) | 2013-06-05 | 2013-06-05 | High power optical fiber laser and optical fiber amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280691A (en) * | 2013-06-05 | 2013-09-04 | 苏州图森激光有限公司 | High-power laser optical fiber amplifier |
| CN107293930A (en) * | 2016-04-01 | 2017-10-24 | 中国兵器装备研究院 | Integrated high power full-optical-fiber laser |
-
2013
- 2013-06-05 CN CN2013203213320U patent/CN203288931U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280691A (en) * | 2013-06-05 | 2013-09-04 | 苏州图森激光有限公司 | High-power laser optical fiber amplifier |
| CN107293930A (en) * | 2016-04-01 | 2017-10-24 | 中国兵器装备研究院 | Integrated high power full-optical-fiber laser |
| CN107293930B (en) * | 2016-04-01 | 2020-01-14 | 中国兵器装备研究院 | Integrated high-power all-fiber laser |
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Granted publication date: 20131113 |
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| CX01 | Expiry of patent term |