CN111509533A - Narrow linewidth single-frequency light source - Google Patents
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- 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
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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Abstract
The invention is suitable for the technical field of optics, and provides a narrow-linewidth single-frequency light source, which comprises a pumping unit; a resonant cavity; the resonant cavity comprises a first filtering reflection unit which is used for carrying out narrow-band filtering and reflection on exciting light in the resonant cavity; the second filtering reflection unit is used for carrying out broadband filtering and reflection on the exciting light in the resonant cavity; the gain optical fiber is used for obtaining exciting light through the excitation of the pump light; the first filtering reflection unit and the second filtering reflection unit are directly inscribed at two ends of the gain optical fiber; the excitation light is filtered by the first filtering reflection unit and the second filtering reflection unit to obtain narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity, so that narrow-line-width single-frequency laser is obtained. The first filtering reflection unit and the second filtering reflection unit are directly engraved at two ends of the gain optical fiber, so that the cavity length is shortened, the longitudinal mode interval is further increased, and a single longitudinal mode is obtained; and the effective gain cavity length is increased, and the problem that the line width and the power cannot be considered at the same time is solved.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a narrow-linewidth single-frequency light source.
Background
With the development of laser technology, it has been developed rapidly in the fields of precision interferometry, laser sensing technology, optical communication technology, and the like. The precise interferometry mainly uses laser wavelength as a 'ruler', and utilizes the interference principle to measure various parameters such as acceleration, displacement, angular displacement and the like. Since the wavelength of light is in the order of nm, the resolution precision is incomparable with the electrical and magnetic elements. The laser interferometer has the advantages of unique large measurement range, high resolution, high measurement precision and the like, and is widely applied to the fields of precision and ultra-precision length measurement. And the distance and interference quality of the precision interferometry are closely related to the line width of the laser. In order to further increase the measurement accuracy in practical design, the laser line width is required to be smaller than lkHz.
In the laser sensing technology, due to the requirements of deep sea oil and gas development and national defense development, the underwater acoustic detection equipment is more and more valued by countries in the world. The sonar pulse ranging system formed by the fiber laser hydrophone array enters an engineering test stage, the fiber laser hydrophone is core equipment of underwater sound detection equipment, the minimum distinguishable longitudinal strain capacity of the fiber laser hydrophone is determined by the line width of a fiber laser, the narrower the line width of the fiber laser is, the higher the sound pressure resolution of the hydrophone is, and the detection of weak signals can be better met.
With the popularization of the internet, how to increase the system transmission rate becomes an important research target in the field of optical communication. In a high-speed optical communication system, in order to meet the requirement of bit errors, the laser linewidth needs to be further narrowed under the modulation format.
From the above analysis, a wide range of laser light sources with high monochromaticity and high coherence is required. The optical fiber single-frequency laser has the advantages of high conversion efficiency, good beam quality, compact structure, good robustness and the like, has wide demand traction, and is one of the hotspots in the laser research field. One of the main methods for realizing a single-frequency laser at present is to insert a narrow-band filter into a laser resonator, and when the bandwidth of the narrow-band filter is smaller than the longitudinal mode spacing of the laser, multiple longitudinal modes can be filtered out, and single longitudinal mode operation is realized, so as to obtain a high-coherence laser source, as shown in fig. 1. The longitudinal mode spacing of the laser is equal to c/2nl, wherein c is the speed of light, n is the refractive index of the medium, and l is the resonance length. Therefore, the longitudinal mode interval is inversely proportional to the length of the laser resonant cavity, and the longer the resonant cavity length is, the smaller the longitudinal mode interval is, the narrower the line width of the narrow-band filter is required, and the difficulty in manufacturing the filter is increased sharply. Therefore, people try to reduce the length of the resonant cavity of the laser so as to reduce the difficulty of manufacturing the filter. The laser gain medium is one of the important components of the laser resonator, and the length of the gain medium is definitely smaller than that of the laser resonator. The doped fiber and the laser crystal are two common laser gain media, and the gain of the doped fiber in the fiber laser per unit length is far smaller than that of the laser crystal of the solid-state laser. To achieve the same gain and output power, fiber lasers will use longer doped fibers whose cavity length will be significantly larger than solid state lasers. On the other hand, in the optical Fiber laser, since the doped optical Fiber as the gain needs to be connected with devices such as an optical Fiber coupler, a wavelength division multiplexer, a Fiber Bragg Grating (FBG) as a filter, and the like, the devices are often fusion-welded by an optical Fiber fusion splicer, and a fusion-splicing clamp also needs to clamp a certain length of the optical Fiber during the fusion-splicing process of the optical Fiber; therefore, after fusion welding, the length of the optical fiber among the devices can be more than several centimeters, so that the cavity length of the whole optical fiber laser is increased; at this point, if the cavity length is compressed by shortening the length of the doped gain fiber, it will result in a decrease in laser output power. In summary, in the fiber single-frequency laser, one of the key problems that people are urgently required to solve is: on the premise of not reducing the doped optical fiber used as a gain medium, how to shorten the length of a laser resonant cavity so as to reduce the manufacturing difficulty of a narrow-band filter; or on the premise of the length of the resonant cavity of a certain optical fiber laser, how to increase the length of the gain medium doped optical fiber as much as possible and increase the power of the optical fiber laser.
If a better single-frequency output needs to be obtained, for a short-cavity single-frequency laser, a grating needs to be engraved on a single-mode fiber and then the grating is welded with a gain fiber, and in the process, because the minimum value of the reflection bandwidth of the grating has a certain bottleneck, the longitudinal mode interval is necessarily large to obtain the single-frequency output. The longitudinal mode spacing is c/2nl, c is the speed of light, n is the refractive index of the medium, the two quantities cannot be changed, only the cavity length l of the resonant cavity can be shortened, and under the existing grating condition, a single frequency can be obtained only when the cavity length is shorter (for example, less than 3 cm). However, in the process of splicing the grating and the gain grating, the grating needs to be attached with a single-mode fiber with a certain length, and in addition, in the process of splicing, a splicing clamp also needs to clamp the fiber with a certain length, so that the cavity length after splicing is far greater than 3cm, and the single-frequency resonant cavity is difficult to obtain. The existing scheme for realizing the single-frequency resonant cavity is to manually cut off redundant single-mode fibers, grind the flat grating and attach the end faces of the gain fibers together, and fix an additional sleeve, so that the structure and the operation are very complex, and the success rate is low.
Disclosure of Invention
The invention aims to provide a narrow-linewidth single-frequency light source, which aims to shorten the length of a resonant cavity of a single-frequency laser, improve the ratio of the length of a laser gain medium in the length of the resonant cavity and solve the technical problem that the shortening of the length of the resonant cavity and the improvement of the power cannot be simultaneously considered.
The invention is realized by that a narrow linewidth single-frequency light source comprises
A pumping unit for outputting pumping light;
the resonant cavity is used for absorbing the pump light and obtaining narrow-linewidth single-frequency laser;
the resonant cavity includes:
the first filtering reflection unit is used for carrying out narrow-band filtering and reflection on the exciting light in the resonant cavity;
the second filtering reflection unit is used for carrying out broadband filtering and reflection on the exciting light in the resonant cavity;
the gain fiber is used for obtaining the exciting light through the excitation of the pumping light;
the first filtering reflection unit and the second filtering reflection unit are directly inscribed at two ends of the gain optical fiber;
the excitation light is filtered by the first filtering reflection unit and the second filtering reflection unit to obtain narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity so as to obtain narrow-line-width single-frequency laser.
In one embodiment, the first filtering reflection unit is a narrow-band filtering reflection unit, the second filtering reflection unit is a wide-band filtering reflection unit, and a filtering range of the narrow-band filtering reflection unit is within a filtering range of the wide-band filtering reflection unit.
In one embodiment, the narrow-band filtering and reflecting unit is a partial reflection narrow-band filtering unit, and is configured to perform narrow-band filtering and partial reflection of light intensity on the laser light in the resonant cavity, and input the pump light and output the narrow-linewidth single-frequency laser light; the broadband filtering reflection unit is a total reflection broadband filtering unit and is used for carrying out broadband filtering and light intensity total reflection on the laser in the resonant cavity.
In one embodiment, the partially-reflective narrow-band filtering unit is an integrated structure capable of performing narrow-band filtering and partial reflection on the laser light;
the total reflection broadband filtering unit is an integrated structure capable of carrying out broadband filtering and total reflection on the laser or is a total reflection mirror.
In one embodiment, the partial reflection narrowband filtering unit comprises a first partial reflector and a first narrowband filtering module arranged in the reflection direction of the first partial reflector; the first partial reflector is formed at the end part of the gain optical fiber, and the first narrow-band filtering module is directly inscribed on the gain optical fiber; the total reflection broadband filtering unit comprises a first total reflection mirror and a first broadband filtering module arranged in the reflection direction of the first total reflection mirror; the first total reflector is formed at the end part of the gain optical fiber, and the first broadband filtering module is directly inscribed on the gain optical fiber.
In one embodiment, the narrow-band filtering and reflecting unit is a total reflection narrow-band filtering unit, and is used for performing narrow-band filtering and total reflection on the laser light in the resonant cavity; the broadband filtering reflection unit is a partial reflection broadband filtering unit and is used for carrying out broadband filtering and partial reflection on light intensity of the laser in the resonant cavity and inputting the pump light and outputting the narrow linewidth single-frequency laser.
In one embodiment, the total reflection narrow-band filtering unit is an integrated structure capable of performing narrow-band filtering and total reflection on the laser; the partial reflection broadband filtering unit is an integrated structure capable of carrying out broadband filtering and partial reflection on the laser, or is a partial reflector.
In one embodiment, the total reflection narrowband filtering unit comprises a second total reflection mirror and a second narrowband filtering module arranged in the reflection direction of the second total reflection mirror; the second holophote is formed at the end part of the gain optical fiber, and the second narrow-band filtering module is directly inscribed on the gain optical fiber;
the partial reflection broadband filtering unit comprises a second partial reflector and a second broadband filtering module arranged in the reflection direction of the second partial reflector; the second partial reflector is formed at the end of the gain fiber, and the second broadband filtering module is directly inscribed on the gain fiber.
In one embodiment, the filtering ranges of the first filtering reflection unit and the second filtering reflection unit are partially overlapped, and the bandwidth of the overlapped part is smaller than the longitudinal mode interval of the resonant cavity, so that narrow-linewidth single-frequency laser is formed.
In one embodiment, a pump light coupling unit is further disposed between the resonant cavity and the pump unit, and is configured to couple the pump light into the resonant cavity and output the narrow linewidth single-frequency laser.
In one embodiment, an isolation unit is disposed on the narrow-linewidth single-frequency laser output path of the pump light coupling unit, or disposed between the pump light coupling unit and the pump unit.
The narrow-linewidth single-frequency light source provided by the invention has the following beneficial effects: the first filtering reflection unit and the second filtering reflection unit are directly engraved at two ends of the gain fiber, so that the length of a single-mode fiber attached to a filter grating can be saved, the clamping length of a clamp is also saved, the distance between the first filtering reflection unit and the second filtering reflection unit is greatly shortened, namely, the cavity length is shortened, the longitudinal mode interval is further increased, a single longitudinal mode is favorably obtained, the light source is simple in structure, and the laser output stability is good; in addition, the first filtering reflection unit and the second filtering reflection unit are directly etched on the gain optical fiber, so that the effective gain cavity length is increased, the gain cavity length can be increased even if the total cavity length is shortened, the power of the laser is improved, and the problem that the line width and the power cannot be considered at the same time is solved.
Drawings
Fig. 1 is a schematic diagram of a single longitudinal mode operation of a narrow-linewidth single-frequency light source according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a narrow linewidth single frequency light source according to an embodiment of the present invention;
fig. 3 is another schematic diagram of a narrow linewidth single-frequency light source according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a narrow linewidth single-frequency light source according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a narrow linewidth single-frequency light source according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a narrow linewidth single-frequency light source according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a narrow linewidth single-frequency light source according to a fourth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a narrow linewidth single-frequency light source according to a fifth embodiment of the present invention;
fig. 9 is a structural diagram of a narrow linewidth single-frequency light source according to a sixth embodiment of the present invention;
fig. 10 is a structural diagram of a narrow-linewidth single-frequency light source according to a seventh embodiment of the present invention;
fig. 11 is a structural diagram of a narrow-linewidth single-frequency light source according to an eighth embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In order to explain the technical solution of the present invention, the following detailed description is made with reference to the specific drawings and examples.
Referring to fig. 1 to 4, an embodiment of the invention provides a narrow linewidth single-frequency light source, where the narrow linewidth generally means a linewidth less than 1.5KHz, and the narrow linewidth single-frequency light source includes a pump unit 10 for outputting pump light; a resonant cavity 20 for absorbing the pump light and obtaining a narrow linewidth single-frequency laser; the resonator 20 includes: a first filtering reflection unit 21 having a grating structure for filtering and reflecting the excitation light within the resonant cavity 20; a second filtering reflection unit 22 having a grating structure for filtering and reflecting the excitation light within the resonant cavity 20; a gain fiber 23 for obtaining laser light by excitation of the pump light; the first filtering reflection unit 21 and the second filtering reflection unit 22 are directly written at two ends of the gain fiber 23; the filtering range of the first filtering reflection unit 21 is within the filtering range of the second filtering reflection unit 22, or the filtering ranges of the first filtering reflection unit and the second filtering reflection unit are partially overlapped, the laser is filtered by the first filtering reflection unit 21 and the second filtering reflection unit 22 to obtain a narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity 20, so that a narrow-line-width single-frequency laser is obtained. In this embodiment, the filtering is frequency filtering, and the reflection is light intensity reflection.
Specifically, the resonant cavity 20 is disposed on an output optical path of the pumping unit 10, and is configured to absorb pumping light and obtain laser light by exciting a gain fiber 23 in the resonant cavity 20 with the pumping light, the first filtering reflection unit 21 and the second filtering reflection unit 22 constitute a cavity of the laser resonant cavity 20, that is, at least two end cavity mirrors may be constituted, and a filtering function is also provided, referring to fig. 2, the first filtering reflection unit 21 and the second filtering reflection unit 22 respectively have filtering bandwidths L4 and L5, the filtering bandwidth L4 is within a range of L5, a bandwidth L3 of the narrow-band laser light obtained after filtering by the first filtering reflection unit 21 and the second filtering reflection unit 22 is determined by L4, and when the filtering bandwidth L4 of the narrow-band laser light in the cavity is smaller than a longitudinal mode interval, a single longitudinal mode output may be obtained, that is a single-frequency mode output may be obtained, that is, and a single-frequency single-mode laser light is output by the first filtering reflection unit 21 or the second filtering reflection unit 22.
Referring to fig. 3 again, the first filtering reflection unit 21 and the second filtering reflection unit 22 respectively have filtering bandwidths L6 and L7, the filtering bandwidths L6 and L7 are partially overlapped, and the bandwidth L3 of the narrow-band laser obtained after filtering is determined by the overlapping bandwidths of L6 and L7. the narrow-band laser is obtained after filtering by the first filtering reflection unit 21 and the second filtering reflection unit 22. by selecting the appropriate first filtering reflection unit 21 and the appropriate second filtering reflection unit 22, and controlling the cavity length of the resonant cavity 20, a single longitudinal mode output, that is, a narrow-linewidth single-frequency laser, can also be obtained.
Referring to fig. 1, in the process of intracavity laser propagation, a cavity length is inversely proportional to a longitudinal mode spacing, as a resonant cavity length becomes shorter, an intracavity longitudinal mode spacing increases, and when an adjacent longitudinal mode spacing L1 is larger than a reflection spectrum bandwidth L2 (a filter bandwidth) of a first filtering reflection unit 21 and a second filtering reflection unit 22, a laser can obtain a single-frequency operation, as shown in fig. 2, in this embodiment, a laser bandwidth L3 in a resonant cavity 20 is determined by a filter bandwidth L4 of the first filtering reflection unit 21, so that a single longitudinal mode operation can be obtained when the longitudinal mode spacing is larger than L4, meanwhile, the longitudinal mode spacing is inversely proportional to the cavity length, and in the case of determining a gain spectrum bandwidth and the filter bandwidth of the first filtering reflection unit 21, the smaller the cavity length is, the smaller the longitudinal mode spacing is, the more easily the single-mode operation is achieved, and the larger the longitudinal mode spacing is larger the filter bandwidth is larger than the filter bandwidth of the first filtering reflection unit 21, and the filter reflection unit 22 is controlled to be in a smaller filter range (for example, L4) by directly writing the first filtering reflection unit 21 on a gain fiber 23.
In the conventional narrow-linewidth single-frequency light source, a section of single-mode fiber is usually required to be welded with a gain fiber after being imprinted with a reflective filter grating, and under the existing grating condition, the cavity length is generally required to be shorter (for example, about 3 cm) to obtain a single frequency. However, in the fusion process of the reflection filter grating and the gain fiber, the grating needs to be attached with a single-mode fiber with a certain length, and a fusion clamp needs to have a certain fiber clamping length, so that the cavity length after fusion is far larger than 3cm, the effective gain cavity length is very short, and the power is influenced. The first filtering reflection unit 21 and the second filtering reflection unit 22 are directly etched at the two ends of the gain fiber 23, so that the cavity length can be shortened, and the problem can be solved.
Furthermore, the narrow-linewidth single-frequency light source provided by the embodiment has the following effects: the first filtering reflection unit 21 and the second filtering reflection unit 22 are directly engraved at two ends of the gain fiber 23, so that the length of a single-mode fiber attached to a filter grating can be saved, the clamping length of a clamp is also saved, the distance between the first filtering reflection unit 21 and the second filtering reflection unit 22 is greatly shortened, namely the cavity length is shortened, the longitudinal mode interval is further increased, a single longitudinal mode can be obtained conveniently, the light source is simple in structure, and the laser output stability is good; in addition, the first filtering reflection unit 21 and the second filtering reflection unit 22 are directly etched on the gain fiber 23, so that the effective gain cavity length is increased, the gain cavity length can be increased even if the total cavity length is shortened, the power of the laser is improved, and the problem that the line width and the power cannot be considered at the same time is solved.
The first filtering reflection unit 21 and the second filtering reflection unit 22 in this embodiment are used for filtering and strongly reflecting the laser light in the resonant cavity 20. The filter grating structure can be the same filter grating structure which can perform double functions of reflecting light intensity and filtering, and can also be a combination of two independent modules which are respectively used for reflecting light intensity and filtering.
Several specific examples of narrow linewidth single frequency light sources are provided below:
the first embodiment is as follows:
referring to fig. 4, in the present embodiment, the first filtering reflection unit 21 is a narrow band filtering reflection unit 21, and the second filtering reflection unit 22 is a wide band filtering reflection unit 22.
The narrow-linewidth single-frequency light source comprises the basic structures, such as the pumping unit 10 and the resonant cavity 20, wherein the resonant cavity 20 comprises the narrow-band filtering reflection unit 21, the wide-band filtering reflection unit 22 and the gain fiber 23; the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 are directly written at two ends of the gain fiber 23; the filtering range of the narrow-band filtering reflection unit 21 is within the filtering range of the wide-band filtering reflection unit 22, the laser is filtered by the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 to obtain a narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity 20, so that a narrow-line-width single-frequency laser is obtained.
In the first embodiment, the narrow-band filtering and reflecting unit 21 is a partial reflection narrow-band filtering unit, and is configured to perform narrow-band filtering on the laser in the resonant cavity 20 and partially reflect the light intensity, where the filtering bandwidth is smaller than the longitudinal mode interval, and the partial reflection narrow-band filtering unit is also used as an input end and a laser output end of the pump light, and is configured to input the pump light and output the narrow-linewidth single-frequency laser; the broadband filtering reflection unit 22 is a total reflection broadband filtering unit, and serves as a total reflection end of the laser, and is configured to perform broadband filtering and total reflection of the light intensity on the laser in the resonant cavity 20, where a bandwidth of the broadband filtering is greater than a longitudinal mode interval and may be much greater than the longitudinal mode interval.
With further reference to fig. 4, the partial reflection narrowband filtering unit is an integrated structure capable of performing narrowband filtering and partial reflection on the laser light in the cavity, and is specifically a partial reflection filter grating. The total reflection broadband filtering unit is an integrated structure capable of carrying out broadband filtering and total reflection on laser, and is specifically a total reflection filtering grating, or the total reflection broadband filtering unit is a total reflection mirror.
Further, a pump light coupling unit 30 is further disposed between the partial reflection narrowband filtering unit of the resonant cavity 20 and the pumping unit 10, and is configured to couple the pump light into the resonant cavity 20 through the partial reflection narrowband filtering unit, and output the narrow linewidth single-frequency laser output by the partial reflection narrowband filtering unit.
Further, an isolation unit 40 is further disposed on the narrow-linewidth single-frequency laser output path of the pump light coupling unit 30, for preventing reverse transmission of laser and protecting the light source. In another embodiment, an isolation unit can be further disposed between the pump unit 10 and the pump light coupling unit 30 to avoid damage to the pump unit 10 due to backward light.
In this embodiment, the total length of the gain fiber 23 can be controlled to be 5-6 cm, the length of the broadband filtering reflection unit 22 is 1-1.5 cm, the length of the narrowband filtering reflection unit 21 is 1-1.5 cm, and the cavity length between the narrowband filtering reflection unit 21 and the broadband filtering reflection unit 22 is 2-3 cm, further, the cavity length between the narrowband filtering reflection unit 21 and the broadband filtering reflection unit 22 can be reduced to about 2.5cm, such as 2.2-2.8 cm. The cavity length between the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 is the effective gain cavity length, and no other non-gain part exists, so that the laser power is improved compared with the traditional fusion type light source.
Example two:
referring to fig. 5, the present embodiment has the same main structure as the first embodiment, the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22.
The narrow-linewidth single-frequency light source comprises a pumping unit 10 and a resonant cavity 20, wherein the resonant cavity 20 comprises a narrow-band filtering reflection unit 21, a broadband filtering reflection unit 22 and a gain fiber 23; the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 are directly written at two ends of the gain fiber 23; the filtering range of the narrow-band filtering reflection unit 21 is within the filtering range of the wide-band filtering reflection unit 22, the laser is filtered by the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 to obtain a narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity 20, so that a narrow-line-width single-frequency laser is obtained.
Further, the narrow-band filtering reflection unit 21 is a partial reflection narrow-band filtering unit, and is configured to perform narrow-band filtering on the laser in the resonant cavity 20 and partially reflect the light intensity, and is further configured to input pump light and output narrow-linewidth single-frequency laser; the broadband filtering reflection unit 22 is a total reflection broadband filtering unit, and is configured to perform broadband filtering on the laser light in the resonant cavity 20 and perform total reflection on the light intensity.
Different from the first embodiment, the partial reflection narrowband filtering unit in the second embodiment is not an integrated reflection filter grating, but a combined structure, specifically including a first partial reflecting mirror 211 and a first narrowband filtering module 212 disposed in the reflection direction of the first partial reflecting mirror 211; the first partial mirror 211 is formed at the end of the gain fiber 23 and the first narrow band filtering module 212 is directly inscribed on the gain fiber 23. Of course, a collimating lens may be provided at the end of the gain fiber 23, and a mirror may be provided at the other end of the collimating lens.
Similarly, the total reflection broadband filtering unit includes a first total reflection mirror 221, and a first broadband filtering module 222 disposed in the reflection direction of the first total reflection mirror 221; the first total reflection mirror 221 is formed at the end of the gain fiber 23, and the first broadband filter module 222 is directly written on the gain fiber 23.
The filtering range of the first narrowband filtering module 212 is within the filtering range of the first wideband filtering module 222, the filtering range of the first narrowband filtering module 212 is smaller than the longitudinal mode interval, and the filtering range of the first wideband filtering module 222 is larger than or far larger than the longitudinal mode interval.
Similarly, the narrow-linewidth single-frequency light source may also include the pump light coupling unit 30 and the isolation unit 40 as in the first embodiment.
Example three:
referring to fig. 6, the present embodiment has the same main structure as the first embodiment, the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22. And will not be described in detail herein.
Further, the narrow-band filtering reflection unit 21 is also a partial reflection narrow-band filtering unit, and is configured to perform narrow-band filtering on the laser in the resonant cavity 20 and partially reflect the light intensity, and is further configured to input pump light and output narrow-linewidth single-frequency laser; the broadband filtering reflection unit 22 is a total reflection broadband filtering unit, and is configured to perform broadband filtering on the laser light in the resonant cavity 20 and perform total reflection on the light intensity.
Different from the first embodiment, the partially reflective narrow-band filtering unit is a partially reflective filter grating with an integrated structure capable of performing narrow-band filtering and partial reflection on the laser light in the cavity. The total reflection broadband filtering unit comprises a first total reflection mirror 221 and a first broadband filtering module 222 arranged in the reflection direction of the first total reflection mirror 221; the first total reflection mirror 221 is formed at the end of the gain fiber 23, and the first broadband filter module 222 is directly written on the gain fiber 23.
Further, the third embodiment may also include the pump light coupling unit 30 and the isolation unit 40 described in the first embodiment.
Example four:
referring to fig. 7, the present embodiment has the same main structure as the first embodiment, the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22. And will not be described in detail herein.
Further, the narrow-band filtering reflection unit 21 is also a partial reflection narrow-band filtering unit, and is configured to perform narrow-band filtering on the laser in the resonant cavity 20 and partially reflect the light intensity, and is further configured to input pump light and output narrow-linewidth single-frequency laser; the broadband filtering reflection unit 22 is a total reflection broadband filtering unit, and is configured to perform broadband filtering on the laser light in the resonant cavity 20 and perform total reflection on the light intensity.
Different from the first embodiment, the partial reflection narrowband filtering unit includes a first partial reflecting mirror 211 and a first narrowband filtering module 212 disposed in a reflection direction of the first partial reflecting mirror 211; the first partial mirror 211 is formed at the end of the gain fiber 23 and the first narrow band filtering module 212 is directly inscribed on the gain fiber 23. The total reflection broadband filtering unit is a total reflection filtering grating with an integrated structure capable of carrying out broadband filtering and total reflection on the laser or a total reflection mirror.
Further, the fourth embodiment may also include the pump light coupling unit 30 and the isolation unit 40 described in the first embodiment.
Example five:
referring to fig. 8, the present embodiment has the same main structure as the first embodiment, the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22. The light source comprises a pumping unit 10 and a resonant cavity 20, wherein the resonant cavity 20 comprises a narrow-band filtering reflection unit 21, a wide-band filtering reflection unit 22 and a gain fiber 23; the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 are directly written at two ends of the gain fiber 23; the filtering range of the narrow-band filtering reflection unit 21 is within the filtering range of the wide-band filtering reflection unit 22, the laser is filtered by the narrow-band filtering reflection unit 21 and the wide-band filtering reflection unit 22 to obtain a narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity 20, so that a narrow-line-width single-frequency laser is obtained.
Different from the first embodiment, the narrow-band filtering and reflecting unit 21 is a total reflection narrow-band filtering unit, and is configured to perform narrow-band filtering on the laser light in the resonant cavity 20 and perform total reflection on the laser light; the broadband filtering and reflecting unit 22 is a partially reflective broadband filtering unit, and serves as a cavity mirror, an input end of the pump light, and a laser output end, and is configured to perform broadband filtering and partially reflect light intensity on the laser in the resonant cavity 20, and input the pump light and output a narrow linewidth single-frequency laser.
Specifically, the total reflection narrowband filtering unit in this embodiment is an all-inverse filtering grating having an integrated structure capable of performing narrowband filtering and total reflection on laser light. The partial reflection broadband filtering unit is a partial reflection filtering grating which has an integrated structure and can perform broadband filtering and partial reflection on laser, or is a partial reflector.
Further, a pump light coupling unit 30 may be further disposed between the broadband filtering reflection unit 22 (partially reflective broadband filtering unit) and the pump unit 10 for coupling the pump light into the resonant cavity 20. And outputs the narrow linewidth single-frequency laser output by the broadband filtering reflection unit 22.
Further, an isolation unit 40 may be further disposed on the narrow-linewidth single-frequency laser output path of the pump light coupling unit 30, so as to prevent reverse transmission of laser and protect the light source.
In this embodiment, the lengths of the gain fiber 23, the narrowband filtering and reflecting unit 21 and the broadband filtering and reflecting unit 22 are the same as those in the first embodiment, and are not described again.
Example six:
referring to fig. 9, the present embodiment has the same main structure as that of the fifth embodiment, the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22. The light source comprises a pumping unit 10 and a resonant cavity 20, wherein the resonant cavity 20 comprises a narrow-band filtering reflection unit 21, a wide-band filtering reflection unit 22 and a gain fiber 23; and will not be described in detail herein.
Further, the narrow band filtering reflection unit 21 is also a total reflection narrow band filtering unit, and the wide band filtering reflection unit 22 is also a partial reflection wide band filtering unit.
Unlike the fifth embodiment, the narrow-band filtering reflection unit 21 (total reflection narrow-band filtering unit) is a combined structure including a second total reflection mirror 213, and a second narrow-band filtering module 214 disposed in the reflection direction of the second total reflection mirror 213; the second total reflection mirror 213 is formed at the end of the gain fiber 23, and the second narrow band filtering module 214 is directly inscribed on the gain fiber 23. The broadband filtering reflection unit 22 (partially reflective broadband filtering unit) is also a combined structure, and includes a second partial reflector 223, and a second broadband filtering module 224 disposed in the reflection direction of the second partial reflector 223; a second partial mirror 223 is formed at the end of the gain fiber 23 and a second broadband filter module 224 is directly inscribed on the gain fiber 23. The filtering range of the second narrowband filtering module 214 is within the filtering range of the second wideband filtering module 224, the filtering range of the second narrowband filtering module 214 is smaller than the longitudinal mode interval, and the filtering range of the second wideband filtering module 224 is larger than or far larger than the longitudinal mode interval.
Similarly, the narrow linewidth single frequency light source may also include the pump light coupling unit 30 and the isolation unit 40 as described in embodiment five, and have the same or similar cavity length.
Example seven:
referring to fig. 10, the present embodiment has the same main structure as that of the fifth embodiment, the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22. The light source comprises a pumping unit 10 and a resonant cavity 20, wherein the resonant cavity 20 comprises a narrow-band filtering reflection unit 21, a wide-band filtering reflection unit 22 and a gain fiber 23; and will not be described in detail herein.
Further, the narrow band filtering reflection unit 21 is also a total reflection narrow band filtering unit, and the wide band filtering reflection unit 22 is a partial reflection wide band filtering unit.
Unlike the fifth embodiment, the narrow-band filtering and reflecting unit 21 is an all-anti-filtering grating having an integrated structure capable of performing narrow-band filtering and total reflection on laser light. The broadband filtering reflection unit 22 is a combined structure including a second partial reflecting mirror 223 and a second broadband filtering module 224 disposed in a reflection direction of the second partial reflecting mirror 223, or is a partial reflecting mirror. A second partial mirror 223 is formed at the end of the gain fiber 23 and a second broadband filter module 224 is directly inscribed on the gain fiber 23.
Further, the narrow-linewidth single-frequency light source may also include the pump light coupling unit 30 and the isolation unit 40 as described in embodiment five.
Example eight:
referring to fig. 11, the present embodiment has the same main structure as that of the fifth embodiment, and the first filtering and reflecting unit 21 is a narrow-band filtering and reflecting unit 21, and the second filtering and reflecting unit 22 is a wide-band filtering and reflecting unit 22. The light source comprises a pumping unit 10 and a resonant cavity 20, wherein the resonant cavity 20 comprises a narrow-band filtering reflection unit 21, a wide-band filtering reflection unit 22 and a gain fiber 23; and will not be described in detail herein.
Further, the narrow band filtering reflection unit 21 is also a total reflection narrow band filtering unit, and the wide band filtering reflection unit 22 is also a partial reflection wide band filtering unit.
Unlike the fifth embodiment, the narrow-band filtering reflection unit 21 (total reflection narrow-band filtering unit) is a combined structure including a second total reflection mirror 213, and a second narrow-band filtering module 214 disposed in the reflection direction of the second total reflection mirror 213; the second total reflection mirror 213 is formed at the end of the gain fiber 23, and the second narrow band filtering module 214 is directly inscribed on the gain fiber 23. The broadband filter reflection unit 22 (partially reflective broadband filter unit) is a partially reflective filter grating having an integrated structure capable of broadband filtering and partially reflecting laser light, or is a partial mirror.
Further, the narrow-linewidth single-frequency light source may also include the pump light coupling unit 30 and the isolation unit 40 as described in embodiment five.
Example nine:
referring to FIG. 3, embodiments of the present invention may employ the aboveThe light source structure according to any one of the first to eighth embodiments is different in that the first filtering and reflecting unit 21 is a filtering and reflecting unit not limited to a narrow bandwidth, and the second filtering and reflecting unit 22 is a filtering and reflecting unit not limited to a wide bandwidth. The bandwidths of the two may be the same or similar, or may be different greatly, but the bandwidths of the two have a partial overlapping region, so that the narrow-band laser light can be obtained after filtering by the first filtering and reflecting unit 21 and the second filtering and reflecting unit 22. This has the advantage that the bandwidth requirements for the filtering reflection unit can be reduced, especially the very narrow bandwidth requirements which are difficult to meet.
The first filtering reflection unit 21 and the second filtering reflection unit 22 are written into the gain fiber 23 and are applied to the laser source resonant cavity 20, so that the cavity length is effectively compressed, single longitudinal mode output is obtained, the laser power is improved, the method has important significance in the field of laser sources, and a narrow linewidth single-frequency laser obtaining scheme which is simple in structure and has both linewidth and power is provided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A narrow linewidth single frequency light source, comprising
A pumping unit for outputting pumping light;
the resonant cavity is used for absorbing the pump light and obtaining narrow-linewidth single-frequency laser;
the resonant cavity includes:
the first filtering reflection unit is used for carrying out narrow-band filtering and reflection on the exciting light in the resonant cavity;
the second filtering reflection unit is used for carrying out broadband filtering and reflection on the exciting light in the resonant cavity;
the gain fiber is used for obtaining the exciting light through the excitation of the pumping light;
the first filtering reflection unit and the second filtering reflection unit are directly inscribed at two ends of the gain optical fiber;
the excitation light is filtered by the first filtering reflection unit and the second filtering reflection unit to obtain narrow-band laser, and the bandwidth of the narrow-band laser is smaller than the longitudinal mode interval of the resonant cavity so as to obtain narrow-line-width single-frequency laser.
2. The narrow linewidth single frequency light source of claim 1, wherein the first filtering reflection unit is a narrow-band filtering reflection unit, the second filtering reflection unit is a wide-band filtering reflection unit, and a filtering range of the narrow-band filtering reflection unit is within a filtering range of the wide-band filtering reflection unit.
3. The narrow linewidth single frequency light source of claim 2,
the narrow-band filtering reflection unit is a partial reflection narrow-band filtering unit and is used for performing narrow-band filtering on the laser in the resonant cavity, partially reflecting the light intensity, inputting the pump light and outputting the narrow-line-width single-frequency laser; the broadband filtering reflection unit is a total reflection broadband filtering unit and is used for carrying out broadband filtering and light intensity total reflection on the laser in the resonant cavity.
4. The narrow linewidth single frequency light source of claim 3, wherein the partially reflective narrow band filtering unit is an integral structure capable of narrow band filtering and partial reflection of the laser light;
the total reflection broadband filtering unit is an integrated structure capable of carrying out broadband filtering and total reflection on the laser or is a total reflection mirror.
5. The narrow linewidth single frequency light source of claim 3, wherein the partially reflective narrow band filtering unit comprises a first partial reflector, and a first narrow band filtering module disposed in a reflection direction of the first partial reflector; the first partial reflector is formed at the end part of the gain optical fiber, and the first narrow-band filtering module is directly inscribed on the gain optical fiber; the total reflection broadband filtering unit comprises a first total reflection mirror and a first broadband filtering module arranged in the reflection direction of the first total reflection mirror; the first total reflector is formed at the end part of the gain optical fiber, and the first broadband filtering module is directly inscribed on the gain optical fiber.
6. The narrow linewidth single frequency light source of claim 2,
the narrow-band filtering reflection unit is a total reflection narrow-band filtering unit and is used for carrying out narrow-band filtering and light intensity total reflection on the laser in the resonant cavity; the broadband filtering reflection unit is a partial reflection broadband filtering unit and is used for carrying out broadband filtering and partial reflection on light intensity of the laser in the resonant cavity and inputting the pump light and outputting the narrow linewidth single-frequency laser.
7. The narrow-linewidth single-frequency light source according to claim 6, wherein the total reflection narrow-band filtering unit is an integrated structure capable of performing narrow-band filtering and total reflection on the laser light; the partial reflection broadband filtering unit is an integrated structure capable of carrying out broadband filtering and partial reflection on the laser, or is a partial reflector.
8. The narrow-linewidth single-frequency light source according to claim 6, wherein the total reflection narrow-band filtering unit comprises a second total reflection mirror, and a second narrow-band filtering module disposed in a reflection direction of the second total reflection mirror; the second holophote is formed at the end part of the gain optical fiber, and the second narrow-band filtering module is directly inscribed on the gain optical fiber;
the partial reflection broadband filtering unit comprises a second partial reflector and a second broadband filtering module arranged in the reflection direction of the second partial reflector; the second partial reflector is formed at the end of the gain fiber, and the second broadband filtering module is directly inscribed on the gain fiber.
9. The narrow linewidth single frequency light source of claim 1, wherein the filtering ranges of the first filtering reflection unit and the second filtering reflection unit are partially overlapped, and the overlapped bandwidth is smaller than the longitudinal mode interval of the resonant cavity, so as to form the narrow linewidth single frequency laser.
10. Narrow linewidth single frequency light source according to any of claims 1 to 9,
and a pumping light coupling unit is also arranged between the resonant cavity and the pumping unit and used for coupling the pumping light into the resonant cavity and outputting the narrow linewidth single-frequency laser.
11. The narrow-linewidth single-frequency light source of claim 10, wherein an isolation unit is disposed on the narrow-linewidth single-frequency laser output path of the pump light coupling unit, or between the pump light coupling unit and the pump unit.
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| CN201910099008.0A CN111509533A (en) | 2019-01-31 | 2019-01-31 | Narrow linewidth single-frequency light source |
| PCT/CN2019/076147 WO2020155248A1 (en) | 2019-01-31 | 2019-02-26 | Narrow-linewidth single-frequency light source |
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| CN201910099008.0A CN111509533A (en) | 2019-01-31 | 2019-01-31 | Narrow linewidth single-frequency light source |
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