CN116191179A - Tile-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation and control - Google Patents
Tile-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation and control Download PDFInfo
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- CN116191179A CN116191179A CN202310080551.2A CN202310080551A CN116191179A CN 116191179 A CN116191179 A CN 116191179A CN 202310080551 A CN202310080551 A CN 202310080551A CN 116191179 A CN116191179 A CN 116191179A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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Abstract
The invention discloses a tile-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation, which comprises two sections of active optical fibers and is pumped by two pumping sources respectively, wherein the two sections of active optical fibers still remain unpumped parts while meeting the requirement of completely absorbing pumping power; the standing wave effect existing in the linear cavity laser can generate a narrow-band refractive index modulation grating in the unpumped part of the two sections of active optical fibers, so that the two sections of active optical fibers serve as gain media to provide laser gain on one hand and serve as a saturable absorber to generate a frequency selection effect on the other hand; the vernier effect is formed by utilizing the narrow-band refractive index modulation grating in the two sections of active optical fibers, so that the frequency selection is enhanced, and the power output level of the single-frequency optical fiber oscillator can be ensured to reach the watt level.
Description
Technical Field
The invention relates to the field of single-frequency fiber lasers, in particular to a tile-level line cavity single-frequency fiber oscillator based on dynamic refractive index grating regulation.
Background
The single-frequency optical fiber oscillator has good monochromaticity, longer coherence length, lower noise characteristic and other excellent performances, and becomes an important laser source in the application fields of scientific research, detection, communication and the like. The main characteristic of the single-frequency optical fiber oscillator is that the single-longitudinal mode operation provides a great challenge for the design of the oscillator, which limits the output power of the single-frequency optical fiber laser, most of the current single-frequency optical fiber lasers have the output power of the order of hundreds of milliwatts, and less of the single-frequency optical fiber lasers can reach the order of hundreds of milliwatts or watts, and the main reason is that the better frequency selecting performance cannot be kept with the increase of the power level.
The current frequency selection modes in oscillators include: ultra-short line cavity, cascade subchamber, composite line cavity, saturable absorber, etc. The ultra-short wire cavity ensures a larger free spectrum range by virtue of a shorter cavity length, and has a compact structure and excellent mode-jump inhibiting performance, but the shorter cavity length also greatly limits the length of a gain medium, so that a high-doped active optical fiber is generally adopted as the gain medium for obtaining higher output power, and the small change of the cavity length caused by the temperature change of the gain medium seriously weakens the selective capacity of an oscillator for the frequency along with the increase of laser power; therefore, frequency selection modes based on low-doped fiber oscillators are also widely studied, wherein the principles of cascading subchambers and composite wire cavities are both based on vernier effect, so that the free spectrum range of the oscillators is increased, the two methods increase the complexity of the system on one hand, and the requirements on the precision of the cavity length are higher on the other hand; the method is a reliable single longitudinal mode implementation mode, is commonly used in a ring cavity structure, and can realize watt-level single-frequency laser output, but under higher pumping power, the frequency selecting function of the saturable absorber is bleached, so that single longitudinal mode operation of the laser can be damaged, and the highest output power of single longitudinal mode operation can be realized by the method which is only of the order of hundred milliwatts.
In summary, the current single-frequency laser frequency selection method cannot keep the effective frequency selection of the laser under the higher output power under the high-power operation, and in order to obtain the higher single-frequency laser output power, development of a more effective frequency selection method is needed to ensure the stable single-frequency laser output above the watt-level output power.
Disclosure of Invention
The invention provides a tile-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation, which improves the frequency selection performance in a single-frequency laser and ensures single longitudinal mode operation under high power condition under the condition of not adding special devices, and is described in detail below:
a tile-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation comprises two sections of active optical fibers which are pumped by two pumping sources respectively,
the two sections of active optical fibers still remain unpumped parts while absorbing pumping power;
the standing wave effect existing in the linear cavity laser generates a narrow-band refractive index modulation grating in the unpumped parts of the two sections of active optical fibers to generate a frequency selection effect; the vernier effect is formed by the narrow-band refractive index modulation gratings in the two sections of active optical fibers, so that the frequency selection effect is further enhanced.
Further, the oscillator includes four cavity-type structures.
In a first scheme, the two sections of active optical fibers are:
the first active optical fiber is positioned at one side of the first high reflection fiber grating, and the second active optical fiber is positioned at one side of the first low reflection fiber grating; the first high reflection fiber grating and the first low reflection fiber grating provide laser feedback; the first active optical fiber and the second active optical fiber are respectively reversely pumped by a first pumping source and a second pumping source; the pump laser output by the first pump source is coupled and injected into the first active optical fiber through the first pump coupling device; the pump laser output by the second pump source is coupled and injected into the second active optical fiber through the second pump coupling device.
In a second scheme, the two sections of active optical fibers are:
the third active optical fiber and the fourth active optical fiber are respectively and positively pumped by a third pump source and a fourth pump source through a third pump coupling device and a fourth pump coupling device.
In a third scheme, the two sections of active optical fibers are:
the fifth active optical fiber is reversely pumped by the fifth pump source through the fifth pump coupling device, and the sixth active optical fiber is positively pumped by the sixth pump source through the sixth pump coupling device.
In a fourth scheme, the two sections of active optical fibers are:
the seventh active optical fiber is positively pumped by a seventh pump source through a seventh pump coupling device, and the eighth active optical fiber is reversely pumped by an eighth pump source through an eighth pump coupling device;
and a section of passive optical fiber with matched size is added between the seventh active optical fiber and the eighth active optical fiber, and the passive optical fiber is used for isolating the narrow-band refractive index modulation grating formed in the seventh active optical fiber and the eighth active optical fiber so as to form a vernier effect.
Wherein the two sections of active optical fibers are active optical fibers doped with the same or different rare earth ions; the two sections of active optical fibers meet the requirement that the two sections of active optical fibers have both an emission section and an absorption section at the central wavelengths of the high-reflection fiber grating and the low-reflection fiber grating.
The active optical fiber is a single-clad optical fiber, a double-clad optical fiber or a triple-clad optical fiber; the center wavelength of the high reflection fiber grating is consistent with that of the low reflection fiber grating.
Preferably, the two pump sources are solid state lasers, fiber lasers, or semiconductor lasers; the two pumping sources are single longitudinal mode laser or multi-longitudinal mode laser; the two pump sources are single transverse mode lasers or high order transverse mode lasers.
The technical scheme provided by the invention has the beneficial effects that:
1. based on the technical means, the frequency selection performance in the single-frequency laser can be improved under the condition of not adding special devices, and the single longitudinal mode operation under the high-power condition is ensured;
2. based on the technical means, a feasible single-frequency operation scheme is provided for the active optical fiber which is in a special wave band, namely has no stronger absorption in the wave band as SA;
3. in the scheme, the SA has lower requirement on the absorption section of the signal light, and the application wave band of the SA can be expanded; the single longitudinal mode performance is optimized based on the regulation and control of the dynamic refractive index modulation grating, the structure is simple and compact, and the stability of the laser longitudinal mode is strong;
4. the scheme can realize a high-power single-frequency optical fiber laser without depending on a highly doped active optical fiber, and has wide application range.
Drawings
FIG. 1 is a schematic diagram of a first structure of a Watt-level linear cavity single-frequency fiber oscillator based on dynamic refractive index grating modulation;
FIG. 2 is a schematic diagram of a second structure of a Watt-level linear cavity single-frequency fiber oscillator based on dynamic refractive index grating modulation;
FIG. 3 is a schematic diagram of a third structure of a Watt-level linear cavity single-frequency fiber oscillator based on dynamic refractive index grating modulation;
fig. 4 is a fourth structural schematic diagram of a watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation.
In the drawings, the list of components represented by the various numbers is as follows:
in fig. 1:
1. a first highly reflective fiber grating; 2. A first active optical fiber;
3. a first pump coupling device; 4. A first pump source;
5. a second active optical fiber; 6. A second pump coupling device;
7. a second pump source; 8. A first low reflection fiber grating;
in fig. 2:
9. a second highly reflective fiber grating; 10. A third pump source;
11. a third pump coupling device; 12. A third active optical fiber;
13. a fourth pump source; 14. A fourth pump coupling device;
15. a fourth active optical fiber; 16. A second low reflection fiber grating;
in fig. 3:
17. a third high reflection fiber grating; 18. A fifth active optical fiber;
19. a fifth pump coupling device; 20. A fifth pump source;
21. a sixth pump source; 22. A sixth pump coupling device;
23. a sixth active optical fiber; 24. A third low reflection fiber grating;
in fig. 4:
25. a fourth highly reflective fiber grating; 26. A seventh pump source;
27. a seventh pump coupling device; 28. A seventh active optical fiber;
29. a passive optical fiber; 30. An eighth active optical fiber;
31. an eighth pump coupling device; 32. An eighth pump source;
33. and a fourth low reflection fiber grating.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
1. Design principle:
a tile-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation comprises two sections of active optical fibers which are respectively pumped by two pumping sources, and the two sections of active optical fibers still remain unpumped parts while absorbing pumping power; the standing wave effect existing in the linear cavity laser can generate a narrow-band refractive index modulation grating in the unpumped part of the two sections of active optical fibers, so that the two sections of active optical fibers serve as gain media to provide laser gain on one hand and serve as SA to generate a frequency selection effect on the other hand; the narrow-band refractive index modulation gratings in the two sections of active optical fibers form vernier effect, so that frequency selection is enhanced, and the requirement of watt-level output power is met.
In the embodiment of the invention, the narrow-band refractive index modulation grating formed in the two sections of active optical fibers is a key for realizing single-frequency operation, and the bandwidth of the narrow-band refractive index modulation grating is related to the intensity and the length of the refractive index modulation grating; therefore, the power ratio of the two pumping sources can be controlled to regulate and control the refractive index modulation gratings in the two sections of active optical fibers, so that the optimal frequency selection effect can be realized under different power levels, and stable single-frequency operation can be realized.
2. Classification of laser oscillator cavity structures
The cavity structure of the laser oscillator in the embodiment of the invention has four types according to different pumping directions:
1. first cavity type structure:
the first high reflection fiber grating 1 and the first low reflection fiber grating 8 provide laser feedback; the first active optical fiber 2 is positioned at one side of the first high reflection fiber grating 1, and the second active optical fiber 5 is positioned at one side of the first low reflection fiber grating 8; the first active optical fiber 2 and the second active optical fiber 5 are respectively reversely pumped by the first pump source 4 and the second pump source 7; the pump laser output by the first pump source 4 is coupled and injected into the first active optical fiber 2 through the first pump coupling device 3; the pump laser light output by the second pump source 7 is coupled and injected into the second active optical fiber 5 through the second pump coupling device 6.
2. The second cavity type structure:
the required device is identical to the first cavity type structure. In this configuration, the third active optical fiber 12 and the fourth active optical fiber 15 are each forward pumped by the third pump source 10 and the fourth pump source 13 via the third pump coupling device 11 and the fourth pump coupling device 14, respectively.
3. Third cavity type structure:
the required device is identical to the first cavity type structure. In this configuration, the fifth active optical fiber 18 is back pumped by the fifth pump source 20 through the fifth pump coupling device 19, and the sixth active optical fiber 23 is forward pumped by the sixth pump source 21 through the sixth pump coupling device 22.
4. Fourth cavity type structure:
the required device is identical to the first cavity type structure. In this configuration, seventh active optical fiber 28 is forward pumped by seventh pump source 26 through seventh pump coupling device 27 and eighth active optical fiber 30 is reverse pumped by eighth pump source 32 through eighth pump coupling device 31; a length of size matched passive optical fiber 29 is added between the seventh active optical fiber 28 and the eighth active optical fiber 30. The passive optical fiber 29 is used to isolate the narrow band index modulated gratings formed in the seventh active optical fiber 28 and the eighth active optical fiber 30, thereby creating a vernier effect.
3. Preference of the device
In the embodiment of the invention, the two sections of active optical fibers can be active optical fibers doped with the same kind of rare earth ions or active optical fibers doped with different kinds of rare earth ions; under the condition of the same rare earth ion doped active optical fiber, two sections of active optical fibers can be the same or different; the invention is not limited by the embodiment of the invention, and only needs to meet the requirement that the high-reflection fiber grating and the low-reflection fiber grating have both an emission section and a certain absorption section at the center wavelength.
The active optical fiber in the embodiment of the invention can be a single-cladding optical fiber or a double-cladding optical fiber, and only needs to ensure that two sections of active optical fibers can provide laser gain and serve as SA.
In the embodiment of the invention, the two matched pump sources can be solid lasers, fiber lasers, semiconductor lasers and the like, so long as the laser with the wavelength can be generated. It may be a single longitudinal mode laser or a multiple longitudinal mode laser, which is not limited in this embodiment of the present invention. The laser may be single transverse mode laser or high-order transverse mode laser, so long as the laser can be coupled into an optical fiber laser system for transmission and absorption, and the embodiment of the invention is not limited thereto.
In the embodiment of the invention, the center wavelengths of the high-reflection fiber grating and the low-reflection fiber grating are consistent, and the reflectivity and the bandwidth only need to realize the oscillation of laser, so the embodiment of the invention is not limited.
In the embodiment of the invention, the pump coupling device can be a wavelength division multiplexer or a pump beam combiner, and the pump coupling device only needs to couple pump laser into the resonant cavity to pump the active optical fiber.
Example 1
A watt-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation is shown in a typical embodiment in figure 1.
The oscillator includes: the first high reflection fiber grating 1, the first active fiber 2, the first pump coupling device 3, the first pump source 4, the second active fiber 5, the second pump coupling device 6, the second pump source 7 and the first low reflection fiber grating 8 are connected in sequence.
Wherein, the central wavelength 2050nm, the reflectivity >99.9% and the half-width 0.5nm of the first high reflection fiber grating 1; the first active optical fiber 2 and the second active optical fiber 5 are thulium-holmium co-doped single-clad optical fibers, the fiber core and the clad have the dimensions of 8 mu m and 125 mu m respectively, the absorption coefficient at 1570nm is 150dB/m, and the lengths thereof are 6m; the first pump source 4 and the second pump source 7 are 1570nm erbium-ytterbium co-doped fiber lasers; the central wavelength 2050nm, the reflectivity 50% and the half-width 0.09nm of the first low reflection fiber grating 8; the first pump coupling device 3 and the second pump coupling device 6 are 1570nm/2000nm wavelength division multiplexers, which are used for coupling 1570nm and 2000nm band lasers.
Example 2
A watt-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation is shown in a typical embodiment in fig. 2.
The oscillator includes: the second high reflection fiber grating 9, the third pump source 10, the third pump coupling device 11, the third active optical fiber 12, the fourth pump source 13, the fourth pump coupling device 14, the fourth active optical fiber 15 and the second low reflection fiber grating 16 are connected in sequence.
Wherein, the center wavelength 1950nm, the reflectivity >99.9% and the half-width 0.5nm of the second high reflective fiber grating 9; the third active optical fiber 12 is a thulium doped double clad fiber with a core/cladding size of 10/130 μm and an absorption coefficient at 1570nm of 800dB/m; the fourth active optical fiber 15 is a thulium doped single cladding optical fiber, the core/cladding size is 9/125 μm, and the absorption coefficient at 1570nm is 150dB/m; the third pump source 10 and the fourth pump source 13 are 1570nm erbium-ytterbium co-doped fiber lasers; the second low reflection fiber grating 16 has a center wavelength 1950nm, a reflectivity of 70%, and a full width at half maximum of 0.05nm. The third pump coupling device 11 and the fourth pump coupling device 14 are 1570nm/1950nm wavelength division multiplexers.
Example 3
A watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation is shown in a typical embodiment in fig. 3.
The oscillator includes: the third high reflection fiber grating 17, the fifth active fiber 18, the fifth pump coupling device 19, the fifth pump source 20, the sixth pump source 21, the sixth pump coupling device 22, the sixth active fiber 23 and the third low reflection fiber grating 24 are connected in sequence.
The central wavelength of the third high reflection fiber grating 17 is 1064nm, the reflectivity is more than 99.9%, and the half-width is 0.3nm; the fifth and sixth active optical fibers 18 and 23 are ytterbium-doped single-clad fibers, the core/cladding size is 5/125 μm, and the absorption coefficient at 976nm is 1500dB/m; the fifth pump source 20 and the sixth pump source 21 are 976nm high-power semiconductor lasers; the third low reflection fiber grating 24 has a center wavelength of 1064nm, a reflectivity of 70%, and a half-width of 0.05nm. The fifth pump coupling device 19 and the sixth pump coupling device 22 are 976nm/1064nm wavelength division multiplexers.
Example 4
A watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation is shown in a typical embodiment in FIG. 4.
The oscillator includes: the fourth high reflection fiber grating 25, the seventh pump source 26, the seventh pump coupling device 27, the seventh active fiber 28, the passive fiber 29, the eighth active fiber 30, the eighth pump coupling device 31, the eighth pump source 32, and the fourth low reflection fiber grating 33 are sequentially connected.
Wherein, the center wavelength of the fourth high reflection fiber grating 25 is 2800nm, the reflectivity is more than 99.9%, and the half-width is 0.3nm; the seventh active optical fiber 28 and the eighth active optical fiber 30 are erbium-doped ZBLAN fibers, the core/cladding size is 15/125 μm, and the absorption coefficient at 976nm is 150dB/m; the seventh pump source 26 and the eighth pump source 32 are 976nm high-power semiconductor lasers; the fourth low reflection fiber grating 33 has a center wavelength of 2800nm, a reflectivity of 70%, and a half-width of 0.1nm. The seventh pump coupling device 27 and the eighth pump coupling device 31 are 976nm/2800nm wavelength division multiplexers.
The embodiment of the invention does not limit the types of other devices except the types of the devices, so long as the devices can complete the functions.
Those skilled in the art will appreciate that the drawings are schematic representations of only one preferred embodiment, and that the above-described embodiment numbers are merely for illustration purposes and do not represent advantages or disadvantages of the embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A tile-level linear cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation is characterized in that the oscillator comprises two sections of active optical fibers and is pumped by two pumping sources respectively,
the two sections of active optical fibers still remain unpumped parts while absorbing pumping power;
the standing wave effect existing in the linear cavity laser generates a narrow-band refractive index modulation grating in the unpumped parts of the two sections of active optical fibers to generate a frequency selection effect; the vernier effect is formed by the narrow-band refractive index modulation gratings in the two sections of active optical fibers, so that the frequency selection effect is further enhanced.
2. The tile-line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation as claimed in claim 1, wherein the power ratio of the two pump sources is controlled to regulate the refractive index modulation gratings in the two sections of active optical fibers, and the optimal frequency-selecting effect is realized under different power levels so as to ensure stable single-frequency operation.
3. The watt-level line cavity single-frequency fiber oscillator based on dynamic refractive index grating regulation as claimed in claim 1, wherein the oscillator comprises four cavity structures.
4. A watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation as claimed in claim 3, wherein the two active optical fibers are:
the first active optical fiber is positioned at one side of the first high reflection fiber grating, and the second active optical fiber is positioned at one side of the first low reflection fiber grating; the first high reflection fiber grating and the first low reflection fiber grating provide laser feedback; the first active optical fiber and the second active optical fiber are respectively reversely pumped by a first pumping source and a second pumping source; the pump laser output by the first pump source is coupled and injected into the first active optical fiber through the first pump coupling device; the pump laser output by the second pump source is coupled and injected into the second active optical fiber through the second pump coupling device.
5. A watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation as claimed in claim 3, wherein the two active optical fibers are:
the third active optical fiber and the fourth active optical fiber are respectively and positively pumped by a third pump source and a fourth pump source through a third pump coupling device and a fourth pump coupling device.
6. A watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation as claimed in claim 3, wherein the two active optical fibers are:
the fifth active optical fiber is reversely pumped by the fifth pump source through the fifth pump coupling device, and the sixth active optical fiber is positively pumped by the sixth pump source through the sixth pump coupling device.
7. A watt-level line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating regulation as claimed in claim 3, wherein the two active optical fibers are:
the seventh active optical fiber is positively pumped by a seventh pump source through a seventh pump coupling device, and the eighth active optical fiber is reversely pumped by an eighth pump source through an eighth pump coupling device;
and a section of passive optical fiber with matched size is added between the seventh active optical fiber and the eighth active optical fiber, and the passive optical fiber is used for isolating the narrow-band refractive index modulation grating formed in the seventh active optical fiber and the eighth active optical fiber so as to form a vernier effect.
8. A tile-line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating modulation according to any one of claims 4-7,
the two sections of active optical fibers are active optical fibers doped with the same or different rare earth ions; the two sections of active optical fibers simultaneously have effective emission sections and absorption sections at the central wavelengths of the high-reflection fiber gratings and the low-reflection fiber gratings.
9. A tile-line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating modulation according to any one of claims 4-7,
the active optical fiber is a single-clad optical fiber, a double-clad optical fiber or a triple-clad optical fiber; the center wavelength of the high reflection fiber grating is consistent with that of the low reflection fiber grating.
10. A tile-line cavity single-frequency optical fiber oscillator based on dynamic refractive index grating modulation according to any one of claims 4-7,
the two pump sources are solid state lasers, fiber lasers, or semiconductor lasers;
the two pumping sources are single longitudinal mode laser or multi-longitudinal mode laser;
the two pump sources are single transverse mode lasers or high order transverse mode lasers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116826496A (en) * | 2023-08-31 | 2023-09-29 | 光科芯图(北京)科技有限公司 | Infrared seed light source and laser system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116826496A (en) * | 2023-08-31 | 2023-09-29 | 光科芯图(北京)科技有限公司 | Infrared seed light source and laser system |
| CN116826496B (en) * | 2023-08-31 | 2024-01-26 | 光科芯图(北京)科技有限公司 | Infrared seed light source and laser system |
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