CN210577002U - High-power ultra-wideband wavelength scanning optical fiber laser system - Google Patents
High-power ultra-wideband wavelength scanning optical fiber laser system Download PDFInfo
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- CN210577002U CN210577002U CN201921949910.9U CN201921949910U CN210577002U CN 210577002 U CN210577002 U CN 210577002U CN 201921949910 U CN201921949910 U CN 201921949910U CN 210577002 U CN210577002 U CN 210577002U
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Abstract
The utility model provides a high-power ultra wide band wavelength scanning fiber laser system, it includes tunable seed source of wavelength, tunable pumping source array of wavelength, pumping signal beam combiner, raman gain optic fibre and optic fibre end cap: the wavelength tunable seed source is connected with a signal input arm of the pumping signal beam combiner; the wavelength tunable pumping source array is respectively accessed to each pumping input arm of the pumping signal beam combiner; the output end of the pumping signal beam combiner is connected with one end of the Raman gain fiber, and the other end of the Raman gain fiber is connected with the fiber end cap; the wavelength scanning range of the high-power ultra-wideband wavelength scanning fiber laser system is larger than 900 nanometers, and the typical value is 1050 nanometers to 2000 nanometers; the continuous light output within the wavelength scan range is greater than 1 kilowatt. The utility model discloses adopt tunable pumping source of wavelength and kind seed source simultaneously, utilize the amplifier to enlarge kind seed source, until producing tunable cascade raman light, enlarge the power scaling when realizing super wide tuning range.
Description
Technical Field
The utility model discloses generally belong to fiber laser technical field, specifically relate to a high-power ultra wide band wavelength scanning fiber laser system.
Background
The high-power optical fiber laser is widely applied to a plurality of important fields such as scientific research, national defense, medical treatment, industry and the like. The nature of the applied laser is actually the interaction process of the laser and the substance, and different application fields need different laser wavelengths due to different substances. However, limited by the limited gain bandwidth, the emission wavelength is often fixed at a specific wavelength, and the 3dB bandwidth, which corresponds to the order of several kilowatts, is often less than ten nanometers. With the rapid expansion of the application range of high-power laser, the conventional single wavelength cannot be matched with the wavelength corresponding to the optimal effect. To achieve the best action, not only the laser output power needs to reach above kilowatt level, but also the laser wavelength needs to be continuously switched in a wider spectral range to match the optimal wavelength of different action substances. Therefore, when the high-power fiber laser with the ultra-wideband wavelength scanning function is applied to the applications, the high integration of a plurality of high-power fiber laser systems is facilitated, the laser systems can be greatly simplified, the cost is saved, and the efficiency is improved.
However, the conventional 1-micron waveband kilowatt-level fiber laser light source has a narrow gain range of rare earth ions, and the tuning range of the conventional 1-micron waveband kilowatt-level fiber laser light source is only 30-40 nanometers, so that the conventional 1-micron waveband kilowatt-level fiber laser light source is far from meeting the requirement of practical application. At present, ultra-wide spectral range laser is mainly realized by a nonlinear effect mode, and is generally divided into two types according to different nonlinear effects, one type is a random fiber laser based on cascade stimulated Raman scattering, and the continuous adjustability in a 1.1-1.9 micron spectral range is realized by conventional tunable fiber laser pumping with a wave band of 1 micron, but the highest power is only tens of watts. The other is a supercontinuum light source generated based on a plurality of nonlinear effects, the output spectral bandwidth of the supercontinuum light source can reach more than 2.4 micrometers, and the power of the supercontinuum light source can reach kilowatt magnitude. However, the spectral density is low, and the power of a specific wavelength is even less than ten watts. Therefore, at present, no high-power fiber laser system capable of simultaneously covering the 1-2 micron ultra-wideband wavelength scanning function exists.
Disclosure of Invention
In order to expand the spectral range of the existing kilowatt-level tunable laser and realize the kilowatt-level laser output with the ultra-wide wavelength scanning function, the utility model provides a high-power ultra-wide band wavelength scanning optical fiber laser system and a tuning method, the wavelength scanning range of the system covers 1-2 microns, and the continuous laser output power of a single wavelength is more than 1 kilowatt.
In order to realize the technical purpose, the technical proposal of the utility model is that: a high-power ultra-wideband wavelength scanning fiber laser system comprises a wavelength tunable seed source, a wavelength tunable pumping source array, a pumping signal beam combiner, a Raman gain fiber and a fiber end cap: the wavelength tunable seed source is connected with a signal input arm of the pumping signal beam combiner; the wavelength tunable pump source array is respectively connected to each pump input arm of the pump signal beam combiner; the output end of the pumping signal beam combiner is connected with one end of the Raman gain fiber, and the other end of the Raman gain fiber is connected with the fiber end cap; the wavelength scanning range of the high-power ultra-wideband wavelength scanning fiber laser system is larger than 900 nanometers, and the typical value is 1050 nanometers to 2000 nanometers; the continuous light output within the wavelength scan range is greater than 1 kilowatt.
The utility model discloses a high-power ultra wide band wavelength scanning fiber laser system still includes the isolator, the isolator sets up between the signal input arm of the tunable seed source of wavelength and pumping signal beam combiner and between each pumping input arm of the tunable pumping source array of wavelength and pumping signal beam combiner, and the isolator is in order to prevent the influence of backward return light, protects the tunable seed source of wavelength and the tunable pumping source array of wavelength.
Further, the wavelength tunable seed source, the wavelength tunable pump source array, the pump signal beam combiner and the Raman gain fiber are connected to form a cascade amplifier structure; the high-power ultra-wideband wavelength scanning fiber laser system comprises more than one group of cascade amplifier structures, wherein the more than one group of cascade amplifier structures are sequentially connected in series and are finally connected with an end cap. More than one group means two or more groups.
Further, the wavelength tuning range of the wavelength tunable pump source array is larger than 40 nanometers, and the central wavelength is in the range of 0.9 to 1.1 micrometers. For example, the tuning range is from 1020 nanometers to 1060 nanometers, or the tuning range is from 1060 nanometers to 1100 nanometers.
Furthermore, the wavelength tunable seed source is a raman fiber laser or a random fiber laser pumped by a wavelength tunable ytterbium-doped fiber laser, and the wavelength range of the wavelength tunable seed source is located in a first-order raman optical gain spectrum corresponding to the wavelength tunable pump source array, such as frequency shift 13.2THz, and corresponds to the maximum raman gain coefficient of the quartz raman gain fiber; the tuning range of the wavelength tuning seed source is greater than 60 nanometers, for example, the tuning range is from 1060 nanometers to 1120 nanometers, or the tuning range is from 1120 nanometers to 1180 nanometers.
Furthermore, the Raman gain fiber is of a large mode field double-clad fiber structure or a graded index fiber structure so as to realize high-brightness cascade Raman light output.
Further, the length of the raman gain fiber is optimized according to the following design factors: and calculating a first-order Raman optical threshold of the tunable pumping source array according to the specific optical fiber structure parameters, pumping and seed center wavelength, so that the first-order Raman optical threshold is equal to or more than 1 kilowatt when the wavelength tunable seed source is closed, and the highest-order cascade Raman optical power corresponding to the longest wavelength in the scanning range is equal to or more than 1 kilowatt when the wavelength tunable seed source is opened.
Further, the zero dispersion wavelength of the raman gain fiber is outside the wavelength scanning range.
Furthermore, the transmission loss and the bending loss of the Raman gain fiber in the wavelength scanning range are far smaller than the corresponding Raman gain.
The utility model discloses a high-power ultra wide band wavelength scanning fiber laser system can be used for high-power ultra wide band power scaling to enlarge, and it realizes the production and the amplification of the high-power laser of different sub-bands in the ultra wide band wavelength range respectively through following step S1-S3: s1, keeping the wavelength tunable seed source closed, starting the wavelength tunable pump source array to work to emit pump light to enter the pump signal beam combiner for beam combination, wherein the Raman gain fiber is only used as an energy transfer fiber to directly output the combined pump light, and the pump power is lower than a first-order Raman light threshold value, so that high-power laser output in a pump tuning range is realized; s2, starting the wavelength tunable seed source to emit seed laser, starting the wavelength tunable pump source array to work to emit pump light, combining the pump light by the pump signal beam combiner, entering the Raman gain fiber, increasing the pump power to a first-order Raman light threshold, and realizing the power calibration amplification of the wavelength tunable seed source; and S3, on the basis of the step S2, continuing to increase the pumping power until the higher-order cascaded Raman light with longer wavelength is generated and amplified, and realizing the continuous expansion of the output wavelength of the high-power laser.
The utility model discloses a high-power ultra wide band wavelength scanning fiber laser system can be used for the wavelength matching of the tunable pumping of high-power wavelength and kind seed source, and the operation is as follows: the method comprises the steps of starting a tunable seed source, adjusting the central wavelength of seed output, starting a wavelength tunable pump source array to work to emit pump light, combining the pump light by a pump signal combiner, entering a Raman gain fiber, adjusting the central wavelength of the pump to enable the wavelength of the seed to be equal to the wavelength of pump Raman peak gain when the pump power is lower than a first-order Raman light threshold, continuing to increase the power to be larger than the first-order Raman light threshold, realizing the wavelength matching of the tunable pump and the seed source, and obtaining the maximization of the Raman gain.
The utility model discloses a high-power ultra wide band wavelength scanning fiber laser system can carry out high-power ultra wide band wavelength continuous scanning simultaneously, realizes different wave band wavelength scanning and power amplification respectively through following step S1-S3: s1, short-wave pump light scanning: the wavelength tunable seed source is kept closed, the wavelength tunable pump source array is started to work to emit pump light to enter the pump signal beam combiner for beam combination, at the moment, the Raman gain fiber is only used as an energy transmission fiber to directly output the combined pump light, and the pump power is lower than a first-order Raman light threshold value, so that the wavelength scanning in a pump tuning range is realized; s2, conventional band scanning and power amplification: starting a wavelength-tunable seed source to emit seed laser, starting a wavelength-tunable pump source array to work to emit pump light, and entering the Raman gain fiber after the pump light is combined by a pump signal beam combiner; the seed wavelength is adjusted firstly during wavelength scanning, and then the central wavelength of the pump is adjusted when the pump power is lower than a first-order Raman optical threshold value, so that the seed wavelength is equal to the wavelength of the pump Raman peak gain, and the wavelength matching of the tunable pump and the seed source is realized; then, continuously increasing the pumping power to be larger than the first-order Raman optical threshold value, and realizing wavelength scanning and power amplification in the seed tuning range; s3, long and ultra-long band scanning and power amplification: on the basis of the step S2, calculating corresponding seeds and pumping wavelengths according to the target wavelength, and then adjusting the seeds and the pumping wavelengths to the wavelengths when the pumping power is lower than a first-order Raman optical threshold value; and then continuing to increase the pumping power until the second-stage and cascade Raman light is generated and amplified, so as to realize wavelength scanning and power amplification in the long-wave and ultra-long-wave band ranges.
It can be seen that the short-wave part of the ultra-wide spectrum tuning is implemented in the following manner: when only the wavelength tunable pump source array emits light, the pump power is controlled to be lower than the first-order Raman light threshold, and the amplifier directly outputs pump laser. The conventional band part implementation of ultra-wide spectrum tuning is as follows: when the wavelength tunable seed source emits light, the output power of the wavelength tunable pump source array is increased to a first-order Raman light threshold, and the wavelength of the wavelength tunable pump source array and the wavelength tunable seed source is adjusted to match the wavelength tunable pump source array and the wavelength tunable seed source to obtain the highest Raman gain, so that the power amplification of the wavelength tunable seed source is realized. The implementation mode of the long wave part of the ultra-wide spectrum tuning is as follows: on the basis of keeping the light emitted by the wavelength tunable seed source, the output power of the wavelength tunable pump source array is further increased, so that the power of the seed light reaches a second-order Raman light threshold, and tuning and power amplification of the corresponding second-order Raman wavelength are realized by adjusting the wavelength of the wavelength tunable pump array and the wavelength tunable seed source. The ultra-long wave part of ultra-wide spectrum tuning is realized by the following steps: on the basis of keeping the light emitted by the wavelength tunable seed source, the output power of the wavelength tunable pump source array is gradually increased, higher Raman orders are gradually generated and amplified, the wavelength of the wavelength tunable pump array and the wavelength tunable seed source is adjusted, and the tuning of the higher Raman orders corresponding to longer wavelengths is realized. Therefore, the cascade Raman fiber amplifier system can ensure the realization of ultra-wide tuning range and single-wavelength high-power output at the same time.
The utility model has the advantages that: meanwhile, a wavelength tunable pump source and a seed source are adopted, the seed source is amplified by using an amplifier structure until tunable cascade Raman light is generated, and power scaling amplification can be realized while the ultra-wide tuning range is realized.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a high-power ultra-wideband wavelength scanning fiber laser system according to an embodiment of the present invention.
Detailed Description
In order to better understand the present invention for those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
A high-power ultra-wideband wavelength scanning fiber laser system is structurally shown in figure 1 and comprises a wavelength tunable seed source, a wavelength tunable pump source array, a pump signal beam combiner, a Raman gain fiber and a fiber end cap, and the total structure is as follows: the wavelength tunable seed source is connected with a signal input arm of the pumping signal beam combiner; the wavelength tunable pumping source array is respectively accessed to each pumping input arm of the pumping signal beam combiner; the output end of the pumping signal beam combiner is connected with one end of the Raman gain fiber, and the other end of the Raman gain fiber is connected with the fiber end cap; isolators are further arranged between the wavelength tunable seed source and the signal input arms of the pumping signal combiner and between the wavelength tunable pumping source array and the pumping input arms of the pumping signal combiner, and are used for preventing the influence of backward return light and protecting the wavelength tunable seed source and the wavelength tunable pumping source array.
More specifically, the parameters and properties of the components are as follows: the wavelength tuning range of the wavelength tunable pump source array is more than 40 nanometers, the central wavelength of the wavelength tunable pump source array is within the range of 0.9 to 1.1 micrometers, and the first-order Raman optical threshold of the wavelength tunable pump source array is equal to or more than 1 kilowatt when the wavelength tunable seed source is closed; the wavelength tunable seed source is a Raman fiber laser or a random fiber laser pumped by a tunable ytterbium-doped fiber laser, the wavelength range of the wavelength tunable seed source is positioned in a first-order Raman optical gain spectrum corresponding to the tunable pumping source array, and the tuning range of the tunable seed source is larger than 60 nanometers; the Raman gain fiber is a large-mode-field double-clad fiber structure or a graded-index fiber structure, the zero dispersion wavelength of the Raman gain fiber is out of the wavelength scanning range, and the transmission loss and the bending loss in the wavelength scanning range are both far smaller than the corresponding Raman gain.
The wavelength scanning range of the high-power ultra-wideband wavelength scanning fiber laser system is larger than 900 nanometers, and the typical value is 1050 nanometers to 2000 nanometers; the continuous light output within the wavelength scan range is greater than 1 kilowatt.
Example 2
A high-power ultra-wideband wavelength scanning fiber laser system comprises a plurality of groups of wavelength tunable seed sources, wavelength tunable pumping source arrays, pumping signal beam combiners and Raman gain fibers, wherein the connection relationship of each group of wavelength tunable seed sources, each group of wavelength tunable pumping source array, each group of pumping signal beam combiners and each Raman gain fiber is the same as that in embodiment 1, the difference is that the plurality of groups are connected in series once, and the rear ends of the groups are connected with end caps; of course, it is preferable to include the same isolator as the connection manner and function in embodiment 1.
The above-mentioned plural groups are more than one group, and typically include two groups, or more than two groups, and the connection manner of each group is the same as that of embodiment 1.
Compared with embodiment 1, the high-power ultra-wideband wavelength scanning fiber laser system of the embodiment can obtain higher power output.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A high-power ultra-wideband wavelength scanning fiber laser system is characterized by comprising a wavelength tunable seed source, a wavelength tunable pumping source array, a pumping signal beam combiner, a Raman gain fiber and a fiber end cap:
the wavelength tunable seed source is connected with a signal input arm of the pumping signal beam combiner;
the wavelength tunable pump source array is respectively connected to each pump input arm of the pump signal beam combiner;
the output end of the pumping signal beam combiner is connected with one end of the Raman gain fiber, and the other end of the Raman gain fiber is connected with the fiber end cap;
the typical value of the wavelength scanning range of the high-power ultra-wideband wavelength scanning fiber laser system is 1050 nanometers to 2000 nanometers; the continuous light output at any wavelength within the wavelength scanning range is greater than 1 kilowatt.
2. The high power ultra-wideband wavelength scanning fiber laser system of claim 1, further comprising isolators disposed between the wavelength tunable seed source and the signal input arms of the pump signal combiner and between the array of wavelength tunable pump sources and the respective pump input arms of the pump signal combiner.
3. The high-power ultra-wideband wavelength scanning fiber laser system according to claim 1 or 2, wherein the wavelength tunable seed source, the wavelength tunable pump source array, the pump signal combiner, and the raman gain fiber are connected to form a cascade amplifier structure; the high-power ultra-wideband wavelength scanning fiber laser system comprises more than one group of cascade amplifier structures, wherein the more than one group of cascade amplifier structures are sequentially connected in series and are finally connected with an end cap.
4. The high power ultra-wideband wavelength scanning fiber laser system of claim 1, wherein the wavelength tunable pump source array has a wavelength tuning range greater than 40 nanometers and a center wavelength in the range of 0.9 to 1.1 microns.
5. The high-power ultra-wideband wavelength scanning fiber laser system of claim 1, wherein the wavelength tunable seed source is a raman fiber laser or a random fiber laser pumped by a wavelength tunable ytterbium-doped fiber laser, the wavelength range of the random fiber laser is located in a first-order raman optical gain spectrum corresponding to the wavelength tunable pump source array, and the tuning range of the wavelength tunable seed source is greater than 60 nm.
6. The high power ultra-wideband wavelength scanning fiber laser system of claim 1, wherein the raman gain fiber is a large mode field double clad fiber structure or a graded index fiber structure.
7. The high power ultra-wideband wavelength scanning fiber laser system according to claim 1, wherein the raman gain fiber has a zero dispersion wavelength outside the wavelength scanning range.
8. The high power ultra-wideband wavelength scanning fiber laser system according to claim 1, wherein the transmission loss and the bending loss of the raman gain fiber are much smaller than the corresponding raman gain over the wavelength scanning range.
9. The high power ultra-wideband wavelength scanning fiber laser system of claim 1, wherein the first order raman optical threshold of the array of wavelength tunable pump sources is equal to or greater than 1 kw when the wavelength tunable seed source is turned off.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111900601A (en) * | 2020-07-15 | 2020-11-06 | 太原理工大学 | High-power tunable chaotic laser light source device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111900601A (en) * | 2020-07-15 | 2020-11-06 | 太原理工大学 | High-power tunable chaotic laser light source device |
| CN111900601B (en) * | 2020-07-15 | 2021-07-27 | 太原理工大学 | High-power tunable chaotic laser light source device |
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