A dual-phase modulation layer coherent array laser

Abstract

The application discloses a dual-phase modulation layer coherent array laser, comprising a pump source, a pump coupling system and a continuous active medium, one side or both sides of the continuous active medium are provided with a dual-phase modulation coupling layer, full reflection layers and high reflection layers are respectively arranged at two ends of the continuous active medium provided with the dual-phase modulation coupling layer, and the continuous active medium, the dual-phase modulation coupling layer, the full reflection layers and the high reflection layers constitute a phase coupling cavity; the pump source excites the continuous active medium to generate oscillation light through the pump coupling system, the oscillation light is incident to the dual-phase modulation coupling layer to be phase modulated, forming phase coupling coherent array oscillation light, the full reflection layers and the high reflection layers make the phase coupling coherent array oscillation light reciprocally oscillate in the phase coupling cavity, and the coherent array laser is output through the high reflection layer. The application can fully utilize the active medium, improve coherence, is beneficial to rapidly forming the coherent array laser with completely closely arranged and aperture filled output light, and has a simple and compact structure.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and more specifically to a dual-phase modulation layer coherent array laser. Background Technology

[0002] High-power, high-beam-quality lasers are widely used in defense, industry, and scientific research. However, the output power of single-channel lasers is limited by factors such as thermal effects, nonlinear effects, optical component damage, and pumping technology, making it difficult to meet the increasing demands of applications. Constructing a coherent laser array and coherently combining the array beams can increase the output beam power while maintaining beam quality. This also helps overcome the decrease in average brightness of high-energy lasers caused by thermal effects, thus breaking through the limitation of traditional single-channel laser power enhancement and becoming an important direction for the development of high-energy laser technology.

[0003] Currently, coherent combining often employs multi-module lasers arranged in an array. Phase-locked output is achieved by actively or passively modulating the phase of the output beams from each module, coherently coupling them into a single beam with higher power density. However, the beam arrangement of the modules cannot be infinitely close; the fill factor of practical laser array coherent combining systems is generally much less than 1. This results in multi-sidelobe far-field diffraction spots in the phase-locked laser array, with a significant portion of the energy distributed in the far-field sidelobes, severely degrading beam quality. Furthermore, existing phase-modulated phase-locked methods require the introduction of external cavities or phase modulators outside the resonant cavities of each laser unit to couple the laser array, making it difficult to achieve high coupling efficiency and high coherence, increasing system complexity, and rapidly increasing system size with the number of laser modules, hindering power expansion. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dual-phase modulation layer coherent array laser. This laser can fully utilize the activation medium, improve coherence, and facilitate the rapid formation of a coherent array laser with completely and tightly arranged output light and aperture filling. Moreover, it has a simple and compact structure.

[0005] This invention discloses a dual-phase modulation layer coherent array laser, comprising: a pump source, a pump coupling system, a continuous activation medium, a dual-phase modulation coupling layer, a total reflection layer, and a high reflection layer. The dual-phase modulation coupling layer is disposed on one or both sides of the continuous activation medium, and the total reflection layer and the high reflection layer are respectively disposed at both ends of the continuous activation medium where the dual-phase modulation coupling layer is disposed. The continuous activation medium, the dual-phase modulation coupling layer, the total reflection layer, and the high reflection layer constitute a phase coupling cavity.

[0006] The pump source excites the continuous activation medium to generate oscillating light through the pump coupling system. The oscillating light is incident on the dual-phase modulation coupling layer for phase modulation to form phase-coupled coherent array oscillating light. The total reflection layer and the high reflection layer cause the phase-coupled coherent array oscillating light to oscillate back and forth in the phase coupling cavity, and output coherent array laser through the high reflection layer.

[0007] As a further improvement of the present invention, the dual-phase modulation coupling layer includes a first phase modulation layer, a passive coupling layer and a second phase modulation layer arranged sequentially, and an anti-reflection layer is provided between the first phase modulation layer and the continuous activation medium; after the oscillating light is incident on the dual-phase modulation coupling layer, it is phase-modulated by the first phase modulation layer, the passive coupling layer and the second phase modulation layer to form phase-coupled coherent array oscillating light.

[0008] As a further improvement of the present invention, when a single-sided phase coupling cavity is provided, the phase coupling cavity consists of, from one end to the other, the following layers in sequence: a total reflection layer, a continuous activation medium, an anti-reflection layer, a dual-phase modulation coupling layer, and a high reflection layer; when a double-sided phase coupling cavity is provided, the phase coupling cavity consists of, from one end to the other, the following layers in sequence: a total reflection layer, a dual-phase modulation coupling layer, an anti-reflection layer, a continuous activation medium, an anti-reflection layer, a dual-phase modulation coupling layer, and a high reflection layer.

[0009] As a further improvement of the present invention, the phase coupling cavity enables a fully filled in-phase supermode to form a stable and free-form phenomenon.

[0010] As a further improvement of the present invention, the thickness of the passive coupling layer satisfies that the phase shift generated by the oscillating light after one pass is -2 times ±2mπ of the periodic phase modulation provided by the first phase modulation layer, where m is an integer.

[0011] As a further improvement of the present invention, the first phase modulation layer and the second phase modulation layer can provide one-dimensional or two-dimensional periodic phase modulation for the oscillating light, and the phase difference between the periodic phase modulation provided by the first phase modulation layer and the second phase modulation layer is 2nπ, where n is an integer.

[0012] As a further improvement of the present invention, the first phase modulation layer, the passive coupling layer and the second phase modulation layer are formed of a passive light-transmitting material, which includes one or more of crystal, glass and sapphire; the first phase modulation layer and the second phase modulation layer respectively form one-dimensional or two-dimensional periodically closely arranged microstructures at corresponding positions, and the microstructures are filled with a passive light-transmitting material with a refractive index different from that of the first phase modulation layer and the second phase modulation layer.

[0013] As a further improvement of the present invention, the pump source includes one of a semiconductor laser, a fiber laser, a xenon lamp, a krypton lamp, a DC excitation source, an AC excitation source, a radio frequency excitation source, and a microwave excitation source, and the pump coupling system includes one or more of an optical fiber module, a space light module, and an electrode module.

[0014] As a further improvement of the present invention, the continuous activation medium is a solid activation medium or a gas activation medium;

[0015] The geometry of the solid activation medium includes one of rod-shaped and sheet-shaped, and the solid activation medium is doped with one or more rare earth ions as gain ions;

[0016] The gas activation medium includes one or more of CO gas, CO2 gas, He-Ne gas, CH4 gas, C2H2 gas, ArF gas, oxygen-iodine gas, and alkali metal gas.

[0017] As a further improvement of the present invention, the reflectivity provided by the total reflection layer and the high reflection layer satisfies the requirement that the coherent array laser is output from the high reflection layer.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Unlike traditional coherent laser arrays that use multi-module lasers, this invention uses a continuous activation medium in conjunction with a dual-phase modulation coupling layer to form a phase-coupled cavity, forming a phase-coupled coherent array oscillating light within the cavity. This allows for full utilization of the activation medium, and the output light forms a coherent array laser with a completely compact arrangement and aperture filling, achieving a single main lobe laser output at the far-field diffraction limit.

[0020] 2. The dual-phase modulation coupling layer of the present invention enables the oscillating light to be coupled within the resonant cavity, which can effectively improve the coupling efficiency, form a full coupling between the light and the activation medium, facilitate the rapid formation of coherent array laser output, improve coherence, and realize high-power laser output with near-diffraction-limited beam quality and narrow linewidth.

[0021] 3. The phase-coupled cavity structure of the present invention can effectively reduce the laser cavity length, has a simple structure, and, combined with the cavity pumping method, can further improve the compactness of the laser structure and easily achieve power expansion. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the single-sided phase-coupled cavity coherent array solid-state laser disclosed in this invention;

[0023] Figure 2 This is a schematic diagram of the structure of the dual-phase-coupled cavity coherent array gas laser disclosed in this invention;

[0024] Figure 3a This is a schematic diagram of the hexagonal arrangement of the dual-phase modulation coupling layer disclosed in this invention.

[0025] Figure 3b This is a schematic diagram of the square-arranged dual-phase modulation coupling layer disclosed in this invention.

[0026] Figure 4 This is a schematic diagram of the heterogeneous continuous activation medium structure disclosed in this invention.

[0027] In the picture:

[0028] 1. Pump source; 2. Pump coupling system; 3. Continuous activation medium; 3-1. Active medium; 3-2. Passive medium; 4. Dual-phase modulation coupling layer; 4-1. First phase modulation layer; 4-2. Passive coupling layer; 4-3. Second phase modulation layer; 5. Total reflection layer; 6. High reflection layer; 7. Anti-reflection layer. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings:

[0031] like Figure 1 , 2 As shown, this invention provides a dual-phase modulation layer coherent array laser, comprising: a pump source 1, a pump coupling system 2, a continuous activation medium 3, a dual-phase modulation coupling layer 4, a total reflection layer 5, a high reflection layer 6, and an anti-reflection layer 7; wherein,

[0032] The pump source 1 of the present invention includes one of a semiconductor laser, a fiber laser, a xenon lamp, a krypton lamp, a DC excitation source, an AC excitation source, a radio frequency excitation source, and a microwave excitation source, such as... Figure 1 The light excitation shown and as Figure 2 The radio frequency excitation shown.

[0033] The pump coupling system 2 of the present invention includes one or more of an optical fiber module, a spatial optical module and an electrode module. The pump coupling system 2 is used to couple the optical excitation or electrical excitation of the pump source 1 and introduce it into the continuous activation medium 3.

[0034] The continuous activation medium 3 of the present invention has a dual-phase modulation coupling layer 4 on one or both sides, such as Figure 1 ,2 As shown; and at both ends of the continuous activation medium 3 with the dual-phase modulation coupling layer 4, a total reflection layer 5 and a high reflection layer 6 are respectively provided. The continuous activation medium 3, the dual-phase modulation coupling layer 4, the total reflection layer 5 and the high reflection layer 6 constitute a phase coupling cavity. The phase coupling cavity can be as follows: Figure 3a The hexagonal arrangement shown or Figure 3b The square arrangement is shown. In use, the pump source 1 excites the continuous activation medium 3 to generate oscillating light through the pump coupling system 2. The oscillating light is incident on the dual-phase modulation coupling layer 4 for phase modulation to form phase-coupled coherent array oscillating light. The total reflection layer 5 and the high reflection layer 6 cause the phase-coupled coherent array oscillating light to oscillate back and forth in the phase coupling cavity, and output coherent array laser through the high reflection layer.

[0035] Specifically:

[0036] The dual-phase modulation coupling layer 4 of the present invention includes a first phase modulation layer 4-1, a passive coupling layer 4-2 and a second phase modulation layer 4-3 arranged sequentially. An anti-reflection layer 7 is provided between the first phase modulation layer 4-1 and the continuous activation medium 3. After the oscillating light is incident on the dual-phase modulation coupling layer 4, it is phase-modulated by the first phase modulation layer 4-1, the passive coupling layer 4-2 and the second phase modulation layer 4-3 to form phase-coupled coherent array oscillating light.

[0037] like Figure 1 As shown, when a single-sided phase coupling cavity is set, the phase coupling cavity consists of the following layers from one end to the other: total reflection layer 5, continuous activation medium 3, antireflection layer 7, first phase modulation layer 4-1, passive coupling layer 4-2, second phase modulation layer 4-3, and high reflection layer 6.

[0038] like Figure 2 As shown, when a dual-phase coupling cavity is provided, the phase coupling cavity consists of the following layers from one end to the other: total reflection layer 5, first phase modulation layer 4-1, passive coupling layer 4-2, second phase modulation layer 4-3, antireflection layer 7, continuous activation medium 3, antireflection layer 7, first phase modulation layer 4-1, passive coupling layer 4-2, second phase modulation layer 4-3, and high reflection layer 6.

[0039] The phase coupling cavity of the present invention enables a stable and free-form formation of a fully filled in-phase supermode.

[0040] The continuous activation medium 3 of the present invention is a solid activation medium or a gas activation medium. The geometry of the solid activation medium includes one of rod-shaped and sheet-shaped. The solid activation medium is doped with one or more rare earth ions as gain ions. The gas activation medium includes one or more of CO gas, CO2 gas, He-Ne gas, CH4 gas, C2H2 gas, ArF gas, oxygen-iodine gas and alkali metal gas.

[0041] The thickness of the passive coupling layer 4-2 of the present invention satisfies that the phase shift generated by the oscillating light after one pass is -2 times ±2mπ, which is the periodic phase modulation provided by the first phase modulation layer 4-1, where m is an integer.

[0042] The first phase modulation layer 4-1 and the second phase modulation layer 4-3 of the present invention can provide one-dimensional or two-dimensional periodic phase modulation for oscillating light. The phase difference between the periodic phase modulation provided by the first phase modulation layer 4-1 and the second phase modulation layer 4-3 is 2nπ, where n is an integer.

[0043] The first phase modulation layer 4-1, the passive coupling layer 4-2, and the second phase modulation layer 4-3 of the present invention are formed of a passive light-transmitting material, which includes one or more of crystal, glass, and sapphire. The first phase modulation layer 4-1 and the second phase modulation layer 4-3 respectively form one-dimensional or two-dimensional periodically closely arranged microstructures at corresponding positions. The shape of the microstructures is determined by the arrangement, and can be arranged as follows: Figure 3a The hexagonal arrangement shown indicates that the microstructure is hexagonal; if according to Figure 3b The square arrangement shown indicates that the microstructure is square. The microstructure is filled with other passive light-transmitting materials with different refractive indices than the first phase modulation layer 4-1 and the second phase modulation layer 4-3.

[0044] The reflectivity provided by the total reflection layer 5 and the high reflection layer 6 of the present invention satisfies the requirement that coherent array lasers are output from the high reflection layer 6.

[0045] This invention provides Figure 1 The fabrication method of the dual-phase modulation layer coherent array laser shown includes:

[0046] Step 1: Etch the first passive light-transmitting material to form a microstructure, and fill the microstructure with a second passive light-transmitting material with a different refractive index than the first passive light-transmitting material to form a first phase modulation layer 4-1 and a second phase modulation layer 4-3.

[0047] Step 2: Polish the surfaces of the first phase modulation layer 4-1 and the second phase modulation layer 4-3, and deposit a high-reflection layer 6 on the surface of the second phase modulation layer 4-3;

[0048] Step 3: Bond the first phase modulation layer 4-1 and the second phase modulation layer 4-3 to the passive coupling layer 4-2;

[0049] Step 4: Deposit a total reflection layer 5 and an anti-reflection layer 7 on the surface of the continuous activation medium 3;

[0050] Step 5: Bond the dual-phase modulation coupling layer 4 to the continuous activation medium 3;

[0051] Step 6: Pump source 1 is injected into continuous activation medium 3 through pump coupling system 2.

[0052] This invention provides Figure 2 The fabrication method of the dual-phase modulation layer coherent array laser shown includes:

[0053] Step 1: Etch the first passive light-transmitting material to form a microstructure, and fill the microstructure with a second passive light-transmitting material with a different refractive index than the first passive light-transmitting material to form a first phase modulation layer 4-1 and a second phase modulation layer 4-3.

[0054] Step 2: Polish the surfaces of the two first phase modulation layers 4-1 and the two second phase modulation layers 4-3, deposit a high-reflection layer 6 on the surface of one of the second phase modulation layers 4-3, and deposit a total reflection layer 5 on the surface of the other second phase modulation layer 4-3;

[0055] Step 3: Bond the first phase modulation layer 4-1 and the second phase modulation layer 4-3 to the passive coupling layer 4-2 to form the left-side dual-phase modulation coupling layer 4 and the right-side dual-phase modulation coupling layer 4, respectively.

[0056] Step 4: Deposit anti-reflection layer 7 on both sides of the continuous activation medium 3;

[0057] Step 5: Bond the dual-phase modulation coupling layer 4 on both sides to the continuous activation medium 3;

[0058] Step 6: Pump source 1 is injected into continuous activation medium 3 through pump coupling system 2.

[0059] Example 1:

[0060] like Figure 1 As shown, the present invention provides a single-sided phase-coupled cavity coherent array solid-state laser, wherein,

[0061] Pump source 1 uses a semiconductor laser (fiber coupled), and the wavelength corresponds to the absorption spectrum of the active sample in the active medium.

[0062] The pump coupling system 2 adopts a spatial optical coupling device composed of spatial optical elements such as lenses, prisms, and mirrors. The pump light is coupled and injected into the continuous activation medium through end-face multi-channel pumping, side pumping, or cavity pumping.

[0063] The continuous activation medium 3 is circular with a diameter of 2 inches; the length of the continuous activation medium is 100-400 μm; the material is glass, crystal, ruby ​​or sapphire, which is doped with one or more rare earth ions as gain ions.

[0064] The first phase modulation layer 4-1 is made of light-transmitting materials such as glass, sapphire, or crystal. Its microstructure shape is determined by its arrangement; in this embodiment, it is arranged in a hexagonal periodic pattern. Figure 3aAs shown, the microstructure is hexagonal in shape with a side length of 10–50 μm; the filling material in the microstructure is SiO2, Si3N4, SiON or other materials, and the thickness of the first phase modulation layer 4-1 can be 0.5–2 μm.

[0065] The passive coupling layer 4-2 is made of transparent materials such as glass, sapphire, or crystal, and its thickness is such that the phase shift generated by the oscillating light after one pass is -2 to +2π times the periodic phase modulation provided by the first phase modulation layer 4-1.

[0066] The second phase modulation layer 4-3 is made of light-transmitting materials such as glass, sapphire, or crystal. The second phase modulation layer and the first phase modulation layer each have the same closely arranged microstructures at corresponding positions. In this embodiment, these microstructures are arranged in a hexagonal periodic pattern. Figure 3a As shown, the microstructure is hexagonal in shape with a side length of 10–50 μm; the filling material in the microstructure is SiO2, Si3N4, SiON, or other materials. The thickness of the second phase modulation layer 4-3 satisfies the requirement that the phase difference of the periodic phase modulation provided by the remaining first phase modulation layers is 2nπ, where n is an integer. In this embodiment, the thickness of the second phase layer is the same as that of the first phase layer.

[0067] The total reflection layer 5 provides reflectivity greater than 99.99% for both pump light and oscillating light.

[0068] The reflectivity provided by the high-reflectivity layer 6 satisfies the requirement that coherent array lasers be output from the partially reflective layer.

[0069] The antireflective layer 7 provides a transmittance of greater than 99.99% for pump light and oscillating light.

[0070] Example 2:

[0071] like Figure 2 As shown, the present invention provides a dual-sided phase-coupled cavity coherent array gas laser, wherein,

[0072] Pump source 1 is a radio frequency excitation source.

[0073] The pump coupling system 2 is a parallel plate electrode; the radio frequency power supply generates radio frequency power to generate high power density radio frequency electromagnetic waves between the parallel plate structure electrodes to excite the gas and continuously activate the ionization of the medium.

[0074] The continuous activation medium 3 is a gas and a buffer gas. The working gas is CO2, and it is also filled with N2 and He gas as buffer gases. The length is 200-4000 mm.

[0075] The first modulation layer 4-1 is made of light-transmitting materials such as ZnSe, Ge, Si, and Mo. The shape of its microstructure is determined by its arrangement; in this embodiment, it is arranged in a periodic quadrilateral pattern. Figure 3bAs shown, the microstructure is quadrilateral in shape with a side length of 50–200 mm; the filling material in the microstructure is SiO2, Si3N4, SiON, or other materials. The thickness of the first phase modulation layer 4-1 can be 5–20 μm.

[0076] The passive coupling layer 4-2 is made of transparent materials such as ZnSe, Ge, Si, and Mo, and its thickness is such that the phase shift generated by the oscillating light after one pass is -2+ times that of the periodic phase modulation provided by the first phase modulation layer 4-1.

[0077] The second phase modulation layer 4-3 is made of light-transmitting materials such as ZnSe, Ge, Si, and Mo. The second phase modulation layer and the first phase modulation layer each have the same closely arranged microstructures at corresponding positions. In this embodiment, they are arranged in a periodic quadrilateral pattern. Figure 3b As shown, the microstructure is quadrilateral with a side length of 50–200 mm; the filling material in the microstructure is CaF, ZnS, As2S3, ZnSe, or other materials. The thickness of the second phase modulation layer 4-3 satisfies a phase difference of 2π between it and the periodic phase modulation provided by the first phase modulation layer.

[0078] The total reflection layer 5 provides reflectivity greater than 99.99% for oscillating light.

[0079] The reflectivity provided by the high-reflectivity layer 6 satisfies the requirement that coherent array lasers be output from the partially reflective layer.

[0080] The antireflective layer 7 provides a transmittance of more than 99.99% for oscillating light.

[0081] Example 3

[0082] like Figure 1 As shown, the present invention provides a single-sided phase-coupled cavity coherent array solid-state laser, wherein,

[0083] Pump source 1 uses a semiconductor laser (fiber coupled), and the wavelength corresponds to the absorption spectrum of the active sample in the active medium.

[0084] The pump coupling system 2 adopts a spatial optical coupling device composed of spatial optical elements such as lenses, prisms, and mirrors. The pump light is coupled and injected into the continuous activation medium through end-face multi-channel pumping, side pumping, or cavity pumping.

[0085] Continuous activation medium 3 is a heterogeneous continuous activation medium, such as Figure 4 As shown, it includes an active medium 3-1 and a passive medium 3-2; the continuous activation medium 3 is circular with a diameter of 3 inches and a length of 1-2 cm; the material connecting the active medium and the passive medium is glass, crystal, ruby ​​or sapphire, wherein the active medium is doped with one or more rare earth ions as gain ions.

[0086] The first phase modulation layer 4-1 is made of light-transmitting materials such as glass, sapphire, or crystal. Its microstructure shape is determined by its arrangement; in this embodiment, it is arranged in a hexagonal periodic pattern. Figure 3a As shown, the microstructure is hexagonal in shape with a side length of 10–50 μm; the filling material in the microstructure is SiO2, Si3N4, SiON or other materials, and the thickness of the first phase modulation layer 4-1 can be 0.5–2 μm.

[0087] The passive coupling layer 4-2 is made of transparent materials such as glass, sapphire, or crystal, and its thickness is such that the phase shift generated by the oscillating light after one pass is -2 to +2π times the periodic phase modulation provided by the first phase modulation layer 4-1.

[0088] The second phase modulation layer 4-3 is made of light-transmitting materials such as glass, sapphire, or crystal. The second phase modulation layer and the first phase modulation layer each have the same closely arranged microstructures at corresponding positions. In this embodiment, these microstructures are arranged in a hexagonal periodic pattern. Figure 3a As shown, the microstructure is hexagonal in shape with a side length of 10–50 μm; the filling material in the microstructure is SiO2, Si3N4, SiON, or other materials. The thickness of the second phase modulation layer 4-3 satisfies the requirement that the phase difference of the periodic phase modulation provided by the remaining first phase modulation layers is 2nπ, where n is an integer. In this embodiment, the thickness of the second phase layer is the same as that of the first phase layer.

[0089] The total reflection layer 5 provides reflectivity greater than 99.99% for both pump light and oscillating light.

[0090] The reflectivity provided by the high-reflectivity layer 6 satisfies the requirement that coherent array lasers be output from the partially reflective layer.

[0091] The antireflective layer 7 provides a transmittance of greater than 99.99% for pump light and oscillating light.

[0092] The advantages of this invention are:

[0093] 1. Unlike traditional coherent laser arrays that use multi-module lasers, this invention uses a continuous activation medium in conjunction with a dual-phase modulation coupling layer to form a phase-coupled cavity, forming a phase-coupled coherent array oscillating light within the cavity. This allows for full utilization of the activation medium, and the output light forms a coherent array laser with a completely compact arrangement and aperture filling, achieving a single main lobe laser output at the far-field diffraction limit.

[0094] 2. The dual-phase modulation coupling layer of the present invention enables the oscillating light to be coupled within the resonant cavity, which can effectively improve the coupling efficiency, form a full coupling between the light and the activation medium, facilitate the rapid formation of coherent array laser output, improve coherence, and realize high-power laser output with near-diffraction-limited beam quality and narrow linewidth.

[0095] 3. The phase-coupled cavity structure of the present invention does not require the introduction of an additional external cavity or phase modulator, which can effectively reduce the laser cavity length. The structure is simple, and combined with the cavity pumping method, it can further improve the compactness of the laser structure and is easy to achieve power expansion.

[0096] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual phase modulation layer coherent array laser, characterized in that, The application relates to a phase-coupled cavity, which comprises a pumping source, a pumping coupling system, a continuous active medium, a double-phase modulation coupling layer, a total reflection layer and a high reflection layer, one side or both sides of the continuous active medium are provided with the double-phase modulation coupling layer, and the total reflection layer and the high reflection layer are respectively arranged at two ends of the continuous active medium provided with the double-phase modulation coupling layer, the continuous active medium, the double-phase modulation coupling layer, the total reflection layer and the high reflection layer form the phase-coupled cavity. The pumping source excites the continuous active medium through the pumping coupling system to generate oscillation light, the oscillation light is incident on the double-phase modulation coupling layer to be phase-modulated to form phase-coupled coherent array oscillation light, and the total reflection layer and the high reflection layer make the phase-coupled coherent array oscillation light reciprocally oscillate in the phase-coupled cavity and output coherent array laser through the high reflection layer. The double-phase modulation coupling layer comprises a first phase modulation layer, a passive coupling layer and a second phase modulation layer arranged in sequence, and an anti-reflection layer is arranged between the first phase modulation layer and the continuous active medium; after the oscillation light is incident on the double-phase modulation coupling layer, the oscillation light is phase-modulated by the first phase modulation layer, the passive coupling layer and the second phase modulation layer to form phase-coupled coherent array oscillation light. The thickness of the passive coupling layer satisfies that the oscillation light passes through the first phase modulation layer once to generate a phase shift of-2 times of periodic phase modulation provided by the passive coupling layer, and m is an integer; the first phase modulation layer and the second phase modulation layer can provide one-dimensional or two-dimensional periodic phase modulation for the oscillation light, and the phase difference between the periodic phase modulation provided by the first phase modulation layer and the second phase modulation layer is 2npi, and n is an integer. When a single-side phase-coupled cavity is arranged, the phase-coupled cavity comprises, in sequence from one end to the other end, the total reflection layer, the continuous active medium, the anti-reflection layer, the double-phase modulation coupling layer and the high reflection layer; when a double-side phase-coupled cavity is arranged, the phase-coupled cavity comprises, in sequence from one end to the other end, the total reflection layer, the double-phase modulation coupling layer, the anti-reflection layer, the continuous active medium, the anti-reflection layer, the double-phase modulation coupling layer and the high reflection layer.

2. The dual-phase modulation layer coherent array laser of claim 1, wherein, The phase-coupled cavity can make the same-phase supermode filled completely to form a stable self-standing state.

3. The dual-phase modulation layer coherent array laser of any of claims 1-2, wherein, The first phase modulation layer, the passive coupling layer and the second phase modulation layer are formed by passive light-transmitting materials, the light-transmitting materials include one or more of crystals, glasses and sapphires; the first phase modulation layer and the second phase modulation layer are respectively formed with one-dimensional or two-dimensional periodic closely arranged microstructures at corresponding positions, and the microstructures are filled with passive light-transmitting materials with different refractive indexes from those of the first phase modulation layer and the second phase modulation layer.

4. The dual-phase modulation layer coherent array laser of claim 1, wherein, The pumping source comprises one of a semiconductor laser, a fiber laser, a xenon lamp, a krypton lamp, a direct-current excitation source, an alternating-current excitation source, a radio-frequency excitation source and a microwave excitation source, and the pumping coupling system comprises one or more of a fiber module, a spatial light module and an electrode module.

5. The dual-phase modulation layer coherent array laser of any of claims 1-2, wherein, The continuous active medium is a solid active medium or a gas active medium; 6. The dual-phase modulator layer coherent array laser of any of claims 1-2, wherein, The geometric shape of the solid active medium comprises one of a rod shape and a flake shape, and the solid active medium is doped with one or more rare earth ions as gain ions; ​ The gas activation medium comprises one or more of CO gas, CO2 gas, He-Ne gas, CH4 gas, C2H2 gas, ArF gas, oxygen iodine gas, and alkali metal gas.

7. The dual-phase modulation layer coherent array laser of any of claims 1-2, wherein, The total reflection layer and the high reflection layer provide reflectivity that meets output of the coherent array laser from the high reflection layer.

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