CN113285337A - Anti-resonance laser based on hollow optical fiber atomic air chamber - Google Patents
Anti-resonance laser based on hollow optical fiber atomic air chamber Download PDFInfo
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- CN113285337A CN113285337A CN202110468606.8A CN202110468606A CN113285337A CN 113285337 A CN113285337 A CN 113285337A CN 202110468606 A CN202110468606 A CN 202110468606A CN 113285337 A CN113285337 A CN 113285337A
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate
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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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1317—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/22—Gases
- H01S3/227—Metal vapour
Abstract
The invention discloses an anti-resonance laser based on a hollow optical fiber atomic gas chamber, which is a ring cavity anti-resonance fiber laser, a first line cavity anti-resonance fiber laser or a second line cavity anti-resonance fiber laser. The ring-shaped cavity anti-resonance fiber laser comprises a frequency-stabilized laser source, a wavelength division multiplexer, a fiber isolator, a fiber coupler and a ring-shaped closed fiber, wherein the ring-shaped closed fiber forms a ring-shaped cavity atomic gas chamber. The first line cavity anti-resonance fiber laser comprises a frequency stabilization laser source, a wavelength division multiplexer, a first fiber grating, a second fiber grating and a linear fiber, wherein the linear fiber forms a line cavity atomic gas chamber. The second line cavity anti-resonance fiber laser comprises a frequency stabilization laser source, a wavelength division multiplexer, a fiber coupler, a third fiber grating, a fourth fiber grating and a linear fiber, wherein the linear fiber forms a line cavity atomic gas chamber. The invention enables the anti-resonance laser to have the laser characteristic of realizing the non-resonance area of the resonant cavity and also has the advantages of lower noise and narrower line width.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to an anti-resonance laser based on a hollow optical fiber atomic gas chamber.
Background
Because the optical fiber has the outstanding characteristics of good beam quality, small volume, high stability, reliability and the like, the optical fiber laser with high frequency stability has wide research in the fields of precision scientific measurement, optical fiber sensing, physical scientific research and the like. In the existing laser frequency stabilization application methods, one is a saturated absorption spectrum frequency stabilization technology, which feeds back a frequency discrimination signal obtained by comparing a laser frequency with an atom-molecule transition spectral line to a laser, locks the laser frequency on the atom-molecule transition spectral line to realize laser frequency stabilization, and has the advantages of small and simple system and low frequency stability; one is to use PDH frequency stabilization technique, which uses a frequency discrimination signal corresponding to the resonant frequency of the optical reference cavity and fed back to the laser power supply or laser to make the laser frequency and the FP cavity resonant frequency remain the same, and its short-term stability is high, but it lacks quantum reference, its long-term stability is poor, and the system is bulky.
The existing frequency stabilization technology generally has defects of different degrees, and the laser principle needs to be considered for improving the frequency stability of laser. At present, the line width of a gain spectrum of a traditional laser is far larger than that of a cavity mode, single longitudinal mode laser output is realized by mode competition of the cavity mode in a gain bandwidth mode, and the mode of the laser output depends on the central frequency of the cavity mode after the mode competition. Meanwhile, the cavity mode is influenced by temperature noise and environmental noise, and the laser traction effect influences the stable output of laser frequency. The laser cavity mode line width in the active optical clock is far larger than the line width of a gain spectrum, the frequency of output laser is determined by the stimulated radiation frequency of atoms, and the influence of a cavity traction effect on the stability of the laser frequency can be reduced.
The dark cavity laser disclosed in the chinese patent application 201910677386.2 is mainly based on a bubble type atomic gas cell as a device for realizing dark cavity laser, and realizes dark cavity laser output working in a completely non-resonant region of a resonant cavity through weak feedback of an anti-resonant cavity. The defects are as follows: the external environment (such as temperature, magnetic field and mechanical vibration) affects the stability of atoms in the bubble type atom gas chamber, and further limits the improvement of the frequency stability of the laser.
Disclosure of Invention
In order to solve the problems, the invention provides an anti-resonance laser based on a hollow optical fiber atomic gas chamber, so that the anti-resonance laser has the laser characteristic of realizing a non-resonance region of a resonant cavity, and compared with resonant cavity laser, the anti-resonance laser has lower laser noise and narrower laser line width, so that the anti-resonance laser has good application prospect in the aspect of laser application.
The invention firstly proposes to fill alkali metal atoms in the fiber core of the fiber to realize the anti-resonance fiber laser free from the cavity traction effect, and utilizes the complete non-resonance region output of the cavity mode to inhibit the cavity traction effect of the laser. The method is realized by utilizing the fact that the central frequency of atomic transition is located at the central frequency of two adjacent cavity modes, and the resonant cavity at the lower part of cavity feedback is located in a non-resonance area, namely, antiresonance laser. The anti-resonance laser can overcome the influence of thermal noise on transmission fidelity, and the reflected light field on the end surface of the resonant cavity forms a basic reverse phase, so that the attenuation of the light field in the cavity is formed. A free spectral range FSR of the cavity is equal to the cavity mode linewidth r of the antiresonant laserdarkAnd the line width r of resonant cavitycavityAnd (c) the sum, i.e.: r ═ fdark+гcavity. Reverse resonance laser line width rdarkTo be greater than the gain linewidth r of the laser gain mediumgain(ii) a Meanwhile, the antiresonant laser needs to satisfy the condition that the Gain of the antiresonant laser is larger than the sum of losses in the optical resonant cavity, namely Gaindark>Gaincavity。
The invention provides a hollow fiber atom air chamber-based antiresonance laser, which is characterized in that: 1. the laser comprises a hollow fiber atomic gas chamber, a pumping laser, a laser gain medium, alkali metal atoms, a wavelength division multiplexer, a Wavelength Division Multiplexing (WDM) filter, and a Wavelength Division Multiplexing (WDM) filter. 2. The laser applied optical fiber has the advantages of good beam quality, high temperature stability, small structure volume and low cost, and has relatively high tolerance to severe experimental environments such as vibration, dust and humidity. The invention solves the technical problems that atoms in a bubble type atom gas chamber of the existing laser equipment are easily influenced by environmental factors and the frequency stability of a laser is poor, and can ensure that the anti-resonance laser not only has the laser characteristic of realizing a non-resonance region of a resonant cavity, but also has the advantages of lower noise and narrower line width.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an anti-resonance laser based on a hollow optical fiber atomic gas chamber is an annular cavity anti-resonance fiber laser, a first line cavity anti-resonance fiber laser or a second line cavity anti-resonance fiber laser;
the ring cavity anti-resonance fiber laser includes: the frequency stabilization laser source, the wavelength division multiplexer, the optical fiber isolator, the optical fiber coupler and the annular closed optical fiber, wherein the wavelength division multiplexer, the optical fiber isolator and the optical fiber coupler are arranged on the annular closed optical fiber; the ring-shaped closed optical fiber consists of a hollow fiber core, alkali metal atoms positioned on the hollow fiber core and an outer cladding layer wrapped on the hollow fiber core to form a ring-shaped cavity atom air chamber; the frequency stabilization laser source is provided with an optical fiber output interface, outputs laser and is coupled into the annular cavity atomic gas chamber through a wavelength division multiplexer; the wavelength of the laser is the pumping wavelength of alkali metal atoms, and polyatomic stimulated radiation is formed between transition energy levels of the alkali metal atoms to form anti-resonance laser in a non-resonance region of a resonant cavity; the optical fiber isolator is used for preventing output laser from being unstable due to reflection of an optical path; the optical fiber coupler is used for outputting the anti-resonance laser according to a certain proportion;
the first line cavity anti-resonance fiber laser includes: the fiber grating laser comprises a frequency stabilizing laser source, a wavelength division multiplexer, a first fiber grating, a second fiber grating and a linear fiber, wherein the wavelength division multiplexer, the first fiber grating and the second fiber grating are arranged on the linear fiber, and the first fiber grating and the second fiber grating are arranged at two ends of the linear fiber; the linear optical fiber consists of a hollow fiber core, alkali metal atoms positioned on the hollow fiber core and an outer cladding layer wrapped on the hollow fiber core to form a linear cavity atomic gas chamber; the frequency stabilization laser source is provided with an optical fiber output interface, outputs laser and is coupled into the linear cavity atomic gas chamber through the wavelength division multiplexer; the wavelength of the laser is the pumping wavelength of alkali metal atoms, and polyatomic stimulated radiation is formed between transition energy levels of the alkali metal atoms to form anti-resonance laser in a non-resonance region of a resonant cavity; the second fiber grating outputs the anti-resonance laser according to a certain proportion through a transmission end of the second fiber grating;
the second line cavity anti-resonance fiber laser includes: the frequency stabilization laser source, the wavelength division multiplexer, the optical fiber coupler, the third optical fiber grating, the fourth optical fiber grating and the linear optical fiber, wherein the wavelength division multiplexer, the optical fiber coupler, the third optical fiber grating and the fourth optical fiber grating are arranged on the linear optical fiber, and the third optical fiber grating and the fourth optical fiber grating are arranged at two ends of the linear optical fiber; the linear optical fiber consists of a hollow fiber core, alkali metal atoms positioned on the hollow fiber core and an outer cladding layer wrapped on the hollow fiber core to form a linear cavity atomic gas chamber; the frequency stabilization laser source is provided with an optical fiber output interface, outputs laser and is coupled into the linear cavity atomic gas chamber through the wavelength division multiplexer; the wavelength of the laser is the pumping wavelength of alkali metal atoms, and polyatomic stimulated radiation is formed between transition energy levels of the alkali metal atoms to form anti-resonance laser in a non-resonance region of a resonant cavity; the optical fiber coupler is used for outputting the anti-resonance laser according to a certain proportion.
Further, the proportion of the anti-resonance laser output by the fiber coupler of the ring cavity anti-resonance fiber laser is not limited, and may be 20%, 40% or 50%.
Furthermore, the reflectivity of the first fiber grating of the first line cavity anti-resonance fiber laser is not limited and can be 10% -99.99%, and the reflectivity of the second fiber grating is not limited and can be 10% -90%.
Further, the first line-cavity anti-resonance fiber laser adjusts the feedback in the cavity by adjusting the linear cavity length between the first fiber grating and the second fiber grating and adjusting the reflectivity of the second fiber grating, so as to form the anti-resonance fiber laser in the non-resonance region of the resonant cavity.
Further, the proportion of the anti-resonance laser output by the second fiber grating of the first line cavity anti-resonance fiber laser is not limited, and may be 10%.
Furthermore, the reflectivity of the third fiber grating and the fourth fiber grating of the second linear cavity antiresonant fiber laser is not limited and can be 10-99.99%.
Further, the second line-cavity anti-resonance fiber laser adjusts the feedback in the cavity by adjusting the linear cavity length between the first fiber grating and the second fiber grating to form the anti-resonance fiber laser in the non-resonance region of the resonant cavity.
Further, the proportion of the output antiresonant laser light of the fiber coupler of the second linear cavity antiresonant fiber laser is not limited, and may be 20%, 40% or 50%.
Further, the ring-type closed optical fiber and the linear optical fiber employ a single mode polarization maintaining optical fiber, a multimode optical fiber or a photonic crystal optical fiber.
Further, the alkali metal atom is a sodium atom, a potassium atom, a rubidium atom, a cesium atom or a calcium atom.
Compared with the prior art, the novelty and creativity of the anti-resonance laser based on the hollow optical fiber atomic gas chamber are realized as follows: 1. the laser comprises a hollow fiber atomic gas chamber, a pumping laser, a laser gain medium, alkali metal atoms, a wavelength division multiplexer, a Wavelength Division Multiplexing (WDM) filter, and a Wavelength Division Multiplexing (WDM) filter. 2. The laser applied optical fiber has the advantages of good beam quality, high temperature stability, small structure volume and low cost, and has relatively high tolerance to severe experimental environments such as vibration, dust and humidity. The invention solves the technical problems that atoms in a bubble type atom gas chamber of the existing laser equipment are easily influenced by environmental factors and the frequency stability of a laser is poor, and can ensure that the anti-resonance laser not only has the laser characteristic of realizing a non-resonance region of a resonant cavity, but also has the advantages of lower noise and narrower line width.
Drawings
Fig. 1 is a schematic structural diagram of a ring cavity anti-resonance fiber laser according to an embodiment of the present invention;
in the figure: 11-frequency stabilized laser source, 12-wavelength division multiplexer, 13-fiber isolator, 14-hollow fiber atom air chamber, 141-fiber outer cladding, 142-fiber hollow fiber core, 143-alkali metal atom and 15-fiber coupler.
Fig. 2 is a schematic structural diagram of a first line cavity antiresonant fiber laser according to an embodiment of the present invention;
in the figure: 21-frequency stabilized laser source, 22-wavelength division multiplexer, 23-hollow optical fiber atom air chamber, 24-first optical fiber grating and 25-second optical fiber grating.
Fig. 3 is a schematic structural diagram of a second linear cavity antiresonant fiber laser according to an embodiment of the present invention;
in the figure: 31-frequency stabilized laser source, 32-wavelength division multiplexer, 33-hollow fiber atom air chamber, 34-fiber coupler, 35-first fiber grating and 36-second fiber grating.
Detailed Description
In order to make the technical solution of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic structural diagram of a ring cavity antiresonance fiber laser. The ring-shaped cavity anti-resonance fiber laser comprises a frequency stabilization laser source 11 with a fiber output interface, a wavelength division multiplexer 12, a fiber isolator 13, a hollow fiber atom air chamber 14 based on a ring-shaped closed fiber and a fiber coupler 15. The frequency stabilized laser source 11 is configured to generate laser light with a stabilized frequency, and output the laser light as pump light. A wavelength division multiplexer 12 is used to couple the frequency stabilized laser into the hollow fiber atom gas cell 14 of the fiber. The fiber isolator 13 prevents the output laser light from being unstable due to the reflection of the laser light in the hollow fiber atomic gas cell 14 (laser cavity). The hollow optical fiber atom gas chamber 14 contains a gain medium, and multi-atom stimulated radiation is formed between transition energy levels of alkali metal atoms by adjusting feedback in a laser cavity to output anti-resonance optical fiber laser in a non-resonance region of a resonant cavity. The fiber coupler 15 outputs the anti-resonance laser light of the resonant cavity according to a certain proportion, and can be a 20:80 coupler, a 40:60 coupler, a 50:50 coupler and the like.
In this embodiment, the optical fiber of the hollow optical fiber atomic gas chamber 14 may be a single-mode polarization-maintaining optical fiber, a multimode optical fiber, or a photonic crystal optical fiber, and the optical fiber structure includes an optical fiber outer cladding 141, an optical fiber hollow core 142, and alkali metal atoms 143 filled therein. The alkali metal atoms 143 filled in the optical fiber may be sodium atoms, potassium atoms, rubidium atoms, cesium atoms, or calcium atoms. Specifically, cesium atoms in alkali metal atoms can be filled because they have a very prominent position in the field of metrology, and 1 second is defined as the duration of 919731770 cycles of transition radiation between two hyperfine ground states of undisturbed cesium 133 atoms, i.e. cesium atomic clock is a time reference, and the seconds, minutes and hours used in life and scientific research are traced back to this basic time unit. Accordingly, the output light wavelength of the frequency stabilization laser device corresponding to the cesium atomic transition spectral line is 455nm or 459 nm.
Fig. 2 is a schematic structural diagram of a line cavity antiresonance fiber laser. The linear cavity anti-resonance fiber laser comprises a frequency stabilization laser source 21 with a fiber output interface, a wavelength division multiplexer 22, a hollow fiber atom air chamber 23 based on a linear fiber, a first fiber grating 24 (with the reflectivity of 10% -99.99%), and a second fiber grating 25 (with the reflectivity of 10% -90%). Specifically, the frequency stabilized laser source 21 is configured to generate laser light after a stabilized frequency, which outputs the laser light as pump light. A wavelength division multiplexer 22 couples the frequency stabilized laser into a hollow fiber atom gas cell 23. The linear optical fiber adopts the same optical fiber structure, the hollow optical fiber atom air chamber 23 contains a gain medium, the frequency stabilized laser forms an anti-resonance linear laser cavity between the first optical fiber grating 24 and the second optical fiber grating, the feedback in the cavity is adjusted by adjusting the cavity length of the anti-resonance linear laser cavity and the reflectivity of the second optical fiber grating 25, and the anti-resonance optical fiber laser in the non-resonance region of the resonant cavity is output.
Fig. 3 is a schematic structural diagram of another line cavity anti-resonance fiber laser. The linear cavity anti-resonance fiber laser comprises a frequency stabilization laser source 31 with a fiber output interface, a wavelength division multiplexer 32, a hollow fiber atom air chamber 33 based on a linear fiber, a fiber coupler 34, a first fiber grating 35 (with the reflectivity of 10% -99.99%) and a second fiber grating (with the reflectivity of 10% -99.99%). Specifically, the frequency stabilized laser light source 31 outputs frequency stabilized laser light, which outputs the laser light as pump light. A wavelength division multiplexer 32 couples the frequency stabilized laser into a hollow fiber atom gas cell 33. The linear optical fiber adopts the same optical fiber structure, the hollow optical fiber atom air chamber 33 contains a gain medium, the frequency stabilized laser forms an anti-resonance linear laser cavity between the first optical fiber grating 34 and the second optical fiber grating 35, the feedback in the cavity is adjusted by adjusting the cavity length of the anti-resonance linear laser cavity, and the anti-resonance optical fiber laser in the non-resonance region of the resonant cavity is output. The fiber coupler 34 outputs the anti-resonant laser light of the resonant cavity in a certain ratio, which may be a 20:80 coupler, a 40:60 coupler, a 50:50 coupler, etc.
The above embodiments are only used to illustrate the technical solution of the present invention, and do not limit the embodiments based on the principle of the present invention. Specifically, in order to realize the hollow optical fiber atom gas chamber-based antiresonance optical fiber laser, the invention is suitable for optical fiber lasers with different wave bands, and meanwhile, alkali metal atoms such as cesium, rubidium, potassium and the like can be filled in a fiber core of the optical fiber, which is well known by the technical personnel in the field, so that the details are not repeated. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Therefore, the protection scope of the present invention is subject to the limitation of the claims.
Claims (5)
1. An anti-resonance laser based on a hollow optical fiber atomic gas chamber is an annular cavity anti-resonance fiber laser, a first line cavity anti-resonance fiber laser or a second line cavity anti-resonance fiber laser; it is characterized in that the preparation method is characterized in that,
the ring cavity anti-resonance fiber laser includes: the frequency stabilization laser source, the wavelength division multiplexer, the optical fiber isolator, the optical fiber coupler and the annular closed optical fiber, wherein the wavelength division multiplexer, the optical fiber isolator and the optical fiber coupler are arranged on the annular closed optical fiber; the ring-shaped closed optical fiber consists of a hollow fiber core, alkali metal atoms positioned on the hollow fiber core and an outer cladding layer wrapped on the hollow fiber core to form a ring-shaped cavity atom air chamber; the frequency stabilization laser source is provided with an optical fiber output interface, outputs laser and is coupled into the annular cavity atomic gas chamber through a wavelength division multiplexer; the wavelength of the laser is the pumping wavelength of alkali metal atoms, and polyatomic stimulated radiation is formed between transition energy levels of the alkali metal atoms to form anti-resonance laser in a non-resonance region of a resonant cavity; the optical fiber isolator is used for enabling laser to be transmitted in a single direction in the ring cavity atomic gas chamber; the optical fiber coupler is used for outputting the anti-resonance laser according to a certain proportion;
the first line cavity anti-resonance fiber laser includes: the fiber grating laser comprises a frequency stabilizing laser source, a wavelength division multiplexer, a first fiber grating, a second fiber grating and a linear fiber, wherein the wavelength division multiplexer, the first fiber grating and the second fiber grating are arranged on the linear fiber, and the first fiber grating and the second fiber grating are arranged at two ends of the linear fiber; the linear optical fiber consists of a hollow fiber core, alkali metal atoms positioned on the hollow fiber core and an outer cladding layer wrapped on the hollow fiber core to form a linear cavity atomic gas chamber; the frequency stabilization laser source is provided with an optical fiber output interface, outputs laser and is coupled into the linear cavity atomic gas chamber through the wavelength division multiplexer; the wavelength of the laser is the pumping wavelength of alkali metal atoms, and polyatomic stimulated radiation is formed between transition energy levels of the alkali metal atoms to form anti-resonance laser in a non-resonance region of a resonant cavity; the second fiber grating outputs the anti-resonance laser according to a certain proportion through a transmission end of the second fiber grating;
the second line cavity anti-resonance fiber laser includes: the frequency stabilization laser source, the wavelength division multiplexer, the optical fiber coupler, the third optical fiber grating, the fourth optical fiber grating and the linear optical fiber, wherein the wavelength division multiplexer, the optical fiber coupler, the third optical fiber grating and the fourth optical fiber grating are arranged on the linear optical fiber, and the third optical fiber grating and the fourth optical fiber grating are arranged at two ends of the linear optical fiber; the linear optical fiber consists of a hollow fiber core, alkali metal atoms positioned on the hollow fiber core and an outer cladding layer wrapped on the hollow fiber core to form a linear cavity atomic gas chamber; the frequency stabilization laser source is provided with an optical fiber output interface, outputs laser and is coupled into the linear cavity atomic gas chamber through the wavelength division multiplexer; the wavelength of the laser is the pumping wavelength of alkali metal atoms, and polyatomic stimulated radiation is formed between transition energy levels of the alkali metal atoms to form anti-resonance laser in a non-resonance region of a resonant cavity; the optical fiber coupler is used for outputting the anti-resonance laser according to a certain proportion.
2. The hollow-fiber-based atomic gas cell antiresonance laser as claimed in claim 1, wherein the first line-cavity antiresonance fiber laser forms antiresonance fiber laser in a non-resonance region of the resonant cavity by adjusting the linear cavity length between the first fiber grating and the second fiber grating and adjusting the reflectivity of the second fiber grating to adjust the feedback in the cavity.
3. The hollow-fiber-based atomic gas cell antiresonance laser as claimed in claim 1, wherein the second line-cavity antiresonance fiber laser adjusts the feedback in the cavity by adjusting the linear cavity length from the first fiber grating to the second fiber grating, thereby forming an antiresonance fiber laser in the non-resonance region of the resonant cavity.
4. The hollow fiber-based atomic gas cell antiresonance laser of claim 1, wherein the ring-shaped closed fiber and the linear fiber are single-mode polarization-maintaining fibers, multimode fibers or photonic crystal fibers.
5. The hollow-fiber-based atomic gas cell antiresonant laser according to claim 1 or 4, wherein the alkali metal atoms are sodium atoms, potassium atoms, rubidium atoms, cesium atoms or calcium atoms.
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