CN219591825U - Single-frequency fiber laser with narrow linewidth annular cavity - Google Patents
Single-frequency fiber laser with narrow linewidth annular cavity Download PDFInfo
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- CN219591825U CN219591825U CN202321508043.1U CN202321508043U CN219591825U CN 219591825 U CN219591825 U CN 219591825U CN 202321508043 U CN202321508043 U CN 202321508043U CN 219591825 U CN219591825 U CN 219591825U
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Abstract
A narrow linewidth ring cavity single frequency fiber laser comprising: the semiconductor pump source, the wavelength division multiplexer, the optical fiber, the adjustable filter, the isolator, the first coupler and the second coupler; the semiconductor pump source, the wavelength division multiplexer, the optical fiber, the adjustable filter, the isolator and the first coupler are connected in sequence and form an annular laser resonant cavity; the first coupler is connected with the second coupler and forms a band gap type filtering resonant cavity. The narrow linewidth annular cavity single-frequency optical fiber laser disclosed by the utility model has reasonable structural design, a fine band gap type filtering resonant cavity is constructed through the interconnection of the first coupler and the second coupler, the synergistic effect of a vernier effect and an optical feedback mechanism is fully exerted, the laser linewidth compression of the annular cavity is realized, and the narrow linewidth tunable annular cavity single-frequency optical fiber laser output is obtained.
Description
Technical Field
The utility model relates to the technical field of fiber lasers, in particular to a narrow linewidth annular cavity single-frequency fiber laser.
Background
The single-frequency fiber laser has the advantages of compact structure, good beam quality and the like, and is widely applied to the fields of laser measurement, fiber sensing, doppler laser radar and the like. The ring cavity single frequency fiber laser is a laser with a ring resonant cavity as a laser resonant cavity. Such a ring resonator is free of any end mirror, is normally incident, and allows for two different propagation directions of light within the cavity, compared to a standing wave (or linear) laser resonator. Meanwhile, the annular cavity single-frequency fiber laser can be freely inserted into a wavelength tuning device in the cavity, so that the large-range tuning of the output laser wavelength is realized. The laser has important application value in the fields of optical fiber communication, laser spectroscopy and the like.
However, the linewidth of the output laser is widened to a certain extent due to the adverse effect that the laser phase disturbance is easily induced due to the excessive devices in the cavity. Therefore, it is necessary to perform linewidth narrowing work for a tunable ring cavity single frequency fiber laser.
At present, the laser linewidth narrowing technology mainly comprises a feedback locking technology based on an ultra-high definition fabry-perot cavity, linewidth narrowing technology based on an optical fiber scattering effect, linewidth narrowing technology based on an optical feedback technology and the like.
The feedback locking technology based on the ultra-high-definition fabry-perot cavity utilizes a frequency discrimination mechanism to extract a frequency error signal, and then generates a control signal through a feedback processing module to load the control signal onto a frequency modulation interface of a laser so as to realize line width narrowing of output laser. However, the development process of the method is complex, and the use environment is strictly required. The line width compression based on the optical fiber scattering effect utilizes the narrow gain bandwidth in the optical scattering effect to construct a laser line width compression system. The above approach typically requires the introduction of a long fiber optic medium, thereby increasing system complexity and uncertainty. The line width narrowing technology based on the optical feedback technology focuses on the self-injection locking mechanism, and laser line width narrowing is achieved by prolonging the service life of photons in the cavity.
Therefore, the utility model aims to provide a narrow linewidth annular cavity single-frequency optical fiber laser, which improves an optical feedback structure on the basis of the traditional optical feedback technology, utilizes the interconnection of two optical fiber couplers to construct a fine band-gap type filtering resonant cavity, fully exerts the synergistic effect of vernier effect and an optical feedback mechanism, realizes the laser linewidth compression of an annular cavity and obtains the single-frequency optical fiber laser output of the narrow linewidth tunable annular cavity.
Disclosure of Invention
The utility model aims to: in order to overcome the defects, the utility model aims to provide the narrow-linewidth annular cavity single-frequency optical fiber laser which is reasonable in structural design, a fine band-gap type filtering resonant cavity is constructed through the interconnection of the first coupler and the second coupler, the synergistic effect of vernier effect and an optical feedback mechanism is fully exerted, the laser linewidth compression of the annular cavity is realized, the narrow-linewidth tunable annular cavity single-frequency optical fiber laser output is obtained, and the application prospect is wide.
The technical scheme is as follows: a narrow linewidth ring cavity single frequency fiber laser comprising:
a semiconductor pump source;
a wavelength division multiplexer;
an optical fiber;
a tunable filter;
an isolator;
the semiconductor pump source, the wavelength division multiplexer, the optical fiber, the adjustable filter, the isolator and the first coupler are connected in sequence and form an annular laser resonant cavity;
and the first coupler is connected with the second coupler and forms a band gap type filtering resonant cavity.
The narrow linewidth annular cavity single-frequency fiber laser has reasonable structural design, a semiconductor pumping source provides pumping energy for an optical fiber through a wavelength division multiplexer, mode selection is carried out by combining an adjustable filter, stable unidirectional optical operation is formed by utilizing unidirectional light transmission characteristics of an isolator, an annular laser resonant cavity is formed by combining the above parts together with a first coupler, single-frequency fiber laser output is generated, then the first coupler and a second coupler are connected with each other to form a fine band gap type filtering resonant cavity, the synergistic effect of vernier effect and an optical feedback mechanism is fully exerted, laser linewidth compression of the annular cavity is realized, and single-frequency fiber laser output of the narrow linewidth tunable annular cavity is obtained.
Furthermore, in the narrow linewidth annular cavity single frequency fiber laser, the semiconductor pumping source is a single mode laser diode.
Preferably, the semiconductor pump source is a 976 nm single-mode laser diode.
Furthermore, in the narrow linewidth annular cavity single-frequency optical fiber laser, the optical fiber is an active optical fiber, and the optical fiber is one of a quartz doped optical fiber, a phosphate doped optical fiber, a germanate doped optical fiber, a tellurate doped optical fiber and a fluoride optical fiber.
Furthermore, the tunable filter is one of a tunable fabry-perot filter, a tunable liquid crystal filter, an acousto-optic tunable filter and a tunable filter based on a volume Bragg grating.
Preferably, the tunable filter is a tunable fabry perot filter, and the working wavelength is 1020-1100 nm.
Further, in the narrow linewidth ring cavity single frequency fiber laser, the coupling ratio of the first coupler is in the range of 0.1:99.9-50:50.
Preferably, the coupling ratio of the first coupler is in the range of 50:50.
Further, in the narrow linewidth ring cavity single frequency fiber laser, the coupling ratio of the first coupler is in the range of 0.1:99.9-50:50.
Preferably, the coupling ratio of the second coupler is in the range of 50:50.
The beneficial effects of the utility model are as follows: the narrow linewidth annular cavity single-frequency fiber laser has reasonable structural design, a semiconductor pumping source provides pumping energy for an optical fiber through a wavelength division multiplexer, mode selection is carried out by combining an adjustable filter, stable unidirectional optical operation is formed by utilizing unidirectional light transmission characteristics of an isolator, the annular laser resonant cavity is formed by combining the first coupler, single-frequency fiber laser output is generated, an optical feedback junction is improved, a fine band-gap type filtering resonant cavity is formed by utilizing interconnection of the first coupler and the second coupler, the synergistic effect of vernier effect and an optical feedback mechanism is fully exerted, laser linewidth compression of the annular cavity is realized, single-frequency fiber laser output of the narrow linewidth tunable annular cavity is obtained, and the application prospect is wide.
Drawings
FIG. 1 is a schematic diagram of a narrow linewidth ring cavity single frequency fiber laser according to the present utility model;
in the figure: semiconductor pump source 1, wavelength division multiplexer 2, optic fibre 3, tunable filter 4, isolator 5, first coupler 6, second coupler 7.
Detailed Description
The utility model is further elucidated below in connection with fig. 1 and example 1.
Example 1
As shown in fig. 1, the narrow linewidth annular cavity single-frequency optical fiber laser of the utility model is composed of a semiconductor pump source 1, a wavelength division multiplexer 2, an optical fiber 3, an adjustable filter 4, an isolator 5, a first coupler 6 and a second coupler 7, wherein the semiconductor pump source 1, the wavelength division multiplexer 2, the optical fiber 3, the adjustable filter 4, the isolator 5 and the first coupler 6 are sequentially connected and form an annular laser resonant cavity, and the first coupler 6 is connected with the second coupler 7 and forms a band gap type filtering resonant cavity.
Wherein, the semiconductor pump source 1 adopts 976 nm single-mode laser diode; the wavelength division multiplexer 2 adopts the wavelength division multiplexer 2 with the working wavelength of 980/1550 nm; the optical fiber 3 adopts PM-YSF-HI-HP model of Nufern company, the core absorption coefficient is 250 dB/m, and the length is 1 m; the type of the tunable filter 4 adopts a tunable Fabry-Perot filter, and the working wavelength is 1020-1100nm; the coupling ratio of the first coupler 6 to the second coupler 7 is 50:50.
The adoption of the optical fiber laser with the structure realizes tunable single-frequency optical fiber laser output with the working wavelength of 1020-1100nm, the wavelength tuning range is limited by the working wavelength range of the adjustable filter 4, and meanwhile, the laser linewidth is only 100 Hz, compared with the free-running laser linewidth of 1 kHz, the laser linewidth compression of 10 times is realized.
The foregoing is merely a preferred embodiment of the utility model, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the utility model, which modifications would also be considered to be within the scope of the utility model.
Claims (6)
1. A narrow linewidth ring cavity single frequency fiber laser comprising:
a semiconductor pump source (1);
a wavelength division multiplexer (2);
an optical fiber (3);
-a tunable filter (4);
an isolator (5);
the semiconductor pump source (1), the wavelength division multiplexer (2), the optical fiber (3), the adjustable filter (4), the isolator (5) and the first coupler (6) are sequentially connected and form an annular laser resonant cavity;
and the second coupler (7), the first coupler (6) is connected with the second coupler (7) and forms a band gap type filtering resonant cavity.
2. The narrow linewidth ring cavity single frequency fiber laser of claim 1 wherein the semiconductor pump source (1) is a single mode laser diode.
3. The narrow linewidth annular cavity single frequency fiber laser of claim 1 wherein the optical fiber (3) is an active optical fiber, the optical fiber (3) being one of a quartz doped optical fiber, a phosphate doped optical fiber, a germanate doped optical fiber, a tellurate doped optical fiber, a fluoride optical fiber.
4. The narrow linewidth ring cavity single frequency fiber laser of claim 1 wherein the tunable filter (4) is one of a tunable fabry perot filter, a tunable liquid crystal filter, an acousto-optic tunable filter, a tunable filter based on a volume bragg grating.
5. The narrow linewidth ring cavity single frequency fiber laser of claim 1 wherein the coupling ratio of the first coupler (6) is in the range of 0.1:99.9-50:50.
6. The narrow linewidth ring cavity single frequency fiber laser of claim 1 wherein the coupling ratio of the first coupler (6) is in the range of 0.1:99.9-50:50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321508043.1U CN219591825U (en) | 2023-06-02 | 2023-06-02 | Single-frequency fiber laser with narrow linewidth annular cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321508043.1U CN219591825U (en) | 2023-06-02 | 2023-06-02 | Single-frequency fiber laser with narrow linewidth annular cavity |
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| Publication Number | Publication Date |
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| CN219591825U true CN219591825U (en) | 2023-08-25 |
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| CN202321508043.1U Active CN219591825U (en) | 2023-06-02 | 2023-06-02 | Single-frequency fiber laser with narrow linewidth annular cavity |
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2023
- 2023-06-02 CN CN202321508043.1U patent/CN219591825U/en active Active
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