Liquid laser

Abstract

The embodiment of the invention provides a liquid laser, which is applied to the technical field of lasers, and comprises a laser used for outputting incident light; the carbon quantum dot solution is used for receiving the incident light to output laser; the resonant cavity is used for receiving the laser and outputting the laser as multi-longitudinal-mode laser or single-longitudinal-mode laser; wherein the carbon quantum dot solution is arranged in the resonant cavity. According to the liquid laser, the incident light can be received through the carbon quantum dot solution, and the laser is output to the resonant cavity, so that the laser is output in the form of multi-longitudinal-mode laser or single-longitudinal-mode laser through the resonant cavity, and the longitudinal mode distance can be adjusted through the liquid laser.

Description

Technical Field

[0001] This application relates to the field of laser technology, and in particular to a liquid laser. Background Technology

[0002] In related technologies, liquid lasers (such as organic dye lasers or rare-earth-doped liquid lasers) have attracted much attention in scientific research and practical applications due to their unique broadband tunable characteristics. Their wavelength tuning capability (reaching the hundreds of nanometers range) mainly relies on the synergistic effect of the spectral characteristics of the gain medium (such as the broadband emission of electronic transitions in dye molecules) and external tuning elements (such as gratings, prisms, or etalons). However, achieving a combination of high-precision tuning and single-mode output faces multiple technical bottlenecks. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a liquid laser designed to achieve adjustable longitudinal mode spacing.

[0004] In a first aspect, embodiments of this application provide a liquid laser, comprising: A laser is used to output incident light; A carbon quantum dot solution is used to receive the incident light in order to output laser light; A resonant cavity is used to receive the laser and output the laser as a multi-longitudinal-mode laser or a single-longitudinal-mode laser. The carbon quantum dot solution is disposed within the resonant cavity.

[0005] According to some embodiments of this application, the resonant cavity includes a cuvette wall and a reflecting aluminum mirror, the reflecting aluminum mirror being disposed on one side of the cuvette wall.

[0006] According to some embodiments of this application, the carbon quantum dot solution is disposed within the wall of the cuvette.

[0007] According to some embodiments of this application, it also includes: A control platform is used to adjust the cavity length of the resonant cavity.

[0008] According to some embodiments of this application, depending on the cavity length, the resonant cavity outputs the laser as a multi-longitudinal-mode laser or a single-longitudinal-mode laser.

[0009] According to some embodiments of this application, the carbon quantum dot solution comprises carbon quantum dots and an organic solvent.

[0010] According to some embodiments of this application, the organic solvent includes: Dimethylformamide, dimethyl sulfoxide, ethanol, acetone.

[0011] According to some embodiments of this application, the concentration of the carbon quantum dots includes: , , , .

[0012] According to some embodiments of this application, the carbon quantum dot solution is used to receive the energy of the incident light and output laser light of a specific wavelength according to the concentration of the carbon quantum dots in the carbon quantum dot solution and the type of the organic solvent.

[0013] According to some embodiments of this application, the wavelength of the incident light is 532 nm.

[0014] According to the technical solution of the embodiments of this application, at least the following beneficial effects are achieved: This application proposes a liquid laser, applied in the field of laser technology, comprising: a laser for outputting incident light; a carbon quantum dot solution for receiving the incident light to output laser light; and a resonant cavity for receiving the laser light and outputting the laser light as a multi-mode laser or a single-mode laser; wherein the carbon quantum dot solution is disposed on the resonant cavity. This application embodiment can receive incident light through the carbon quantum dot solution and output laser light to the resonant cavity, thereby outputting the laser light as a multi-mode laser or a single-mode laser through the resonant cavity. Therefore, the liquid laser of this application embodiment can achieve adjustable longitudinal mode spacing.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0017] Figure 1 This is a schematic diagram of the structure of a liquid laser provided in one embodiment of this application; Figure 2 This is a schematic diagram of the emission spectrum provided in one embodiment of this application; Figure 3 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 4 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 5 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 6 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 7 This is a schematic diagram of the resonant cavity structure provided in one embodiment of this application. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0022] In some cases, liquid lasers (such as organic dye lasers or rare-earth-doped liquid lasers) have attracted much attention in scientific research and practical applications due to their unique broadband tunability. Their wavelength tuning capability (reaching the hundreds of nanometers range) mainly relies on the synergistic effect of the spectral characteristics of the gain medium (such as the broadband emission of electronic transitions in dye molecules) and external tuning elements (such as gratings, prisms, or etalons). However, achieving a combination of high-precision tuning and single-mode output faces multiple technical bottlenecks.

[0023] First, there is a trade-off between wide tuning range and narrow linewidth; second, the dynamic characteristics of the liquid medium interfere with tuning stability; simultaneously, liquid flow or local temperature gradients can disrupt the phase coherence of the optical field, exacerbating multi-longitudinal mode competition; furthermore, nonlinear effects and mode control are difficult to balance: under high-power operation, the Kerr effect or self-aggregation of the liquid can distort the spatial distribution of the beam, exciting higher-order transverse modes, while suppressing transverse modes requires the introduction of spatial filters or pinhole apertures, further restricting tuning freedom. Therefore, achieving synergistic optimization of wide-range, high-precision wavelength tuning and stable single-longitudinal-mode output in liquid lasers still requires overcoming the triple challenges of medium homogeneity, thermal disturbance suppression, and low-loss mode selection techniques.

[0024] Based on the above, this application proposes a liquid laser designed to achieve adjustable longitudinal mode spacing.

[0025] The various embodiments of the liquid laser of this application will be further described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a liquid laser provided in one embodiment of this application.

[0027] In one embodiment, the liquid laser includes: a laser 100, a carbon quantum dot solution 200, and a resonant cavity.

[0028] Understandably, the laser 100 is used to output incident light; the carbon quantum dot solution 200 is used to receive incident light to output laser light; the resonant cavity is used to receive laser light and output laser light as multi-mode laser light or single-mode laser light; wherein, the carbon quantum dot solution 200 is disposed inside the resonant cavity.

[0029] It is understood that the laser 100 mentioned above can be a nanosecond laser, and can be selected according to actual needs. This application embodiment does not specifically limit the specific type of laser 100.

[0030] It is understandable that when laser 100 is a nanosecond laser, the wavelength of the incident light output by laser 100 is 532 nanometers, the output frequency is 10 Hz, and the pulse width is 8 nanoseconds.

[0031] It is understood that the embodiments of this application can receive incident light through the carbon quantum dot solution 200 and output laser light to the resonant cavity, thereby outputting laser light as a multi-mode laser or a single-mode laser through the resonant cavity. Therefore, the liquid laser of the embodiments of this application can achieve adjustable longitudinal mode spacing.

[0032] In another embodiment, the resonant cavity includes a cuvette wall 310 and a reflecting aluminum mirror 320, with the reflecting aluminum mirror 320 disposed on one side of the cuvette wall 310.

[0033] It is understandable that the aluminum mirror 320 and the cuvette wall 310 are placed vertically and parallel to each other, and the space between the aluminum mirror 320 and the cuvette wall 310 constitutes a cavity. By changing the cavity length, multi-mode laser or single-mode laser output can be achieved, and the longitudinal mode spacing can be adjusted.

[0034] It is understandable that the carbon quantum dot solution 200 is disposed within the cuvette wall 310, and the carbon quantum dot solution 200 can adhere to the surface of the cuvette wall 310 through physical adsorption or chemical bonding.

[0035] In another embodiment, the liquid laser also includes a control platform.

[0036] Understandably, the control platform is used to adjust the cavity length of the resonant cavity.

[0037] It is understood that the embodiments of this application adjust the cavity length of the resonant cavity through the control platform, so that the resonant cavity can output laser as multi-longitudinal-mode laser or single-longitudinal-mode laser according to the cavity length, thereby enabling the liquid laser to achieve adjustable longitudinal mode spacing.

[0038] It is understood that the control platform mentioned above can be a three-dimensional displacement platform, which can be set according to actual needs. This application embodiment does not specifically limit it.

[0039] For example, a three-dimensional displacement platform can precisely control the cavity length. When the cavity length is shortened, the laser will be converted into a multi-mode laser or a single-mode laser and output.

[0040] In another embodiment, the carbon quantum dot solution 200 includes carbon quantum dots and an organic solvent.

[0041] It is understandable that carbon quantum dot solution 200 can be obtained by dispersing carbon quantum dots in an organic solvent.

[0042] Understandably, the carbon quantum dot solution 200 is used to receive the incident light output from the laser 100 and to receive the energy of the incident light. Then, the energy is transferred to a lower energy level to form a layout number inversion, thereby outputting a laser of a specific wavelength to the resonant cavity.

[0043] It is understood that the organic solvent mentioned above can be dimethylformamide or dimethyl sulfoxide, and can be set according to actual needs. This application does not specifically limit it.

[0044] It is understandable that the concentration of the aforementioned carbon quantum dots could be... It can be It can be It can be The settings can be configured according to actual needs, and the embodiments of this application do not impose specific limitations on them.

[0045] It is understood that the carbon quantum dot solution 200 is used to receive the incident light output by the laser 100 and to receive the energy of the incident light. Then, the energy is transferred to a lower energy level to form a layout number inversion, and a laser of a specific wavelength is output according to the concentration of carbon quantum dots in the carbon quantum dot solution 200 and the type of organic solvent. The laser is a random laser.

[0046] It is understandable that carbon quantum dots of different concentrations dispersed in different types of organic solvents will produce different carbon quantum dot solutions 200. Under the same incident light conditions, the wavelengths of the output lasers will be inconsistent. Thus, by changing the carbon quantum dot solution 200 on the cuvette wall 310, different wavelengths of lasers output to the resonant cavity can be achieved.

[0047] Based on the liquid lasers of the above embodiments, the overall embodiments of the liquid lasers of this application are presented below.

[0048] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, Figure 2 This is a schematic diagram of the emission spectrum provided in one embodiment of this application; Figure 3 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 4 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 5 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 6 This is a schematic diagram of the emission spectrum provided in another embodiment of this application; Figure 7 This is a schematic diagram of the resonant cavity structure provided in one embodiment of this application.

[0049] Under the excitation of the incident light of a nanosecond laser, carbon quantum dots are dispersed at a suitable concentration in organic solvents with different refractive indices. By controlling the cavity length of the Fabry-Perot resonator, which is composed of an external reflecting aluminum mirror 320 and a cuvette wall 310, the output of multi-longitudinal-mode or even single-longitudinal-mode lasers can be achieved.

[0050] The carbon quantum dot solution 200 receives the incident light output from the laser 100 and receives the energy of the incident light. Then, it transfers the energy to a lower energy level to form a layout number inversion and outputs a laser of a specific wavelength according to the concentration of the carbon quantum dot solution in the carbon quantum dot solution 200 and the type of organic solvent. The laser is a random laser.

[0051] Understandably, the incident light has a wavelength of 532 nanometers, an output frequency of 10 Hz, and a pulse width of 8 nanoseconds.

[0052] It is understood that the organic solvent mentioned above can be dimethylformamide or dimethyl sulfoxide, and can be set according to actual needs. This application does not specifically limit it.

[0053] It is understandable that the concentration of the aforementioned carbon quantum dots could be... It can be It can be It can be The settings can be configured according to actual needs, and the embodiments of this application do not impose specific limitations on them.

[0054] It is understandable that the reflective aluminum mirror 320 and the cuvette wall 310 of the outdoor unit are placed vertically parallel, and the length of the cavity is precisely controlled by a three-dimensional displacement platform.

[0055] It is understandable that the aforementioned carbon quantum dot solution can achieve single-mode laser output in the near-infrared region.

[0056] Understandably, the resonant cavity includes the reflecting aluminum mirror 320 and the cuvette sidewalls, with the cavity length between the reflecting aluminum mirror 320 and the cuvette sidewalls controlled by a three-dimensional platform. When the quantum dot solvent solution is pumped by high-energy incident light, the excited region forms a gain-induced waveguide structure. Random lasers emitted from both sides of the cuvette form efficient optical feedback between the cavities. As the cavity length shortens, the random lasers transform into multi-longitudinal-mode lasers or even single-longitudinal-mode lasers.

[0057] For example, such as Figure 2 , with a concentration of Carbon quantum dots are dispersed in the organic solvent of acetone to obtain a carbon quantum dot acetone solution. When the carbon quantum dot acetone solution is excited by incident light, a large number of photons are arranged in the energy level belonging to 572nm, and spontaneous emission fluorescence of 572nm is emitted.

[0058] For example, such as Figure 3 , with a concentration of Carbon quantum dots are dispersed in an organic solvent of ethanol to obtain a carbon quantum dot ethanol solution. When the carbon quantum dot ethanol solution is excited by incident light, a large number of photons are arranged at 660nm and 705nm, and at this time, multi-peak spontaneous emission fluorescence at 660nm and 705nm is emitted.

[0059] For example, such as Figure 4 , with a concentration of Carbon quantum dots are dispersed in an organic solvent of dimethyl sulfoxide to obtain a carbon quantum dot dimethyl sulfoxide solution. When the carbon quantum dot dimethyl sulfoxide solution is excited by incident light, a large number of photons are arranged at 715 nm, and at this time, stimulated emission random laser at 715 nm is emitted.

[0060] For example, such as Figure 5 , with a concentration of Carbon quantum dots are dispersed in an organic solvent of dimethylformamide to obtain a carbon quantum dot dimethylformamide solution. When the carbon quantum dot dimethylformamide solution is excited by incident light, a large number of photons are arranged at 710 nm, and at this time, stimulated emission random laser at 710 nm is emitted.

[0061] For example, such as Figure 6 When carbon quantum dots with a concentration of 1 g∙L⁻¹ are dispersed in an organic solvent, a carbon quantum dot solution 200 is obtained. When this solution is excited by incident light and coupled to a cavity, a multi-mode laser or even a single-mode laser with different longitudinal mode spacings is emitted at a wavelength of 710 nm. When the cavity length is 189 μm, the longitudinal mode spacing is 1.54 nm; when the cavity length is 71 μm, the longitudinal mode spacing is 3.03 nm; and when the cavity length is 38 μm, the laser transforms into a single longitudinal mode.

[0062] It is understandable that when the organic solvent is acetone or ethanol, the refractive index coefficient RI is less than 1.45, and laser cannot be emitted. Therefore, laser can only be emitted and form feedback with the resonant cavity when the refractive index coefficient RI is greater than 1.45. In addition, the closer the refractive index coefficient is to 1.45, the better the feedback effect. The refractive index coefficient of the cuvette wall is 1.45.

[0063] It is worth noting that, in this embodiment, by adjusting the cavity length formed by the externally added aluminum reflector 320 and the cuvette wall 310, the quantum dot laser can be transformed from a random laser to a multimode laser or even a single-mode laser. In addition, by adjusting the concentration of different carbon quantum dot solutions and the type of organic solvent, the photon number inversion of different energy levels can be achieved, thereby controlling the output of lasers at different wavelengths. Therefore, the liquid laser of this application can reduce the cost of laser mode spacing and wavelength tuning, and its principle is simple and universal.

[0064] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A liquid laser, characterized in that, include: A laser is used to output incident light; A carbon quantum dot solution is used to receive the incident light in order to output laser light; A resonant cavity is used to receive the laser and output the laser as a multi-longitudinal-mode laser or a single-longitudinal-mode laser. The carbon quantum dot solution is disposed within the resonant cavity.

2. The liquid laser according to claim 1, characterized in that, The resonant cavity includes a cuvette wall and a reflecting aluminum mirror, with the reflecting aluminum mirror disposed on one side of the cuvette wall.

3. The liquid laser according to claim 2, characterized in that, The carbon quantum dot solution is disposed within the wall of the cuvette.

4. The liquid laser according to claim 3, characterized in that, Also includes: A control platform is used to adjust the cavity length of the resonant cavity.

5. The liquid laser according to claim 4, characterized in that, Depending on the cavity length, the resonant cavity outputs the laser as a multi-longitudinal-mode laser or a single-longitudinal-mode laser.

6. The liquid laser according to claim 1, characterized in that, The carbon quantum dot solution comprises carbon quantum dots and an organic solvent.

7. The liquid laser according to claim 6, characterized in that, The organic solvent includes: Dimethylformamide, dimethyl sulfoxide.

8. The liquid laser according to claim 6, characterized in that, The concentration of the carbon quantum dots includes: , , , 。 9. The liquid laser according to claim 8, characterized in that, The carbon quantum dot solution is used to receive the energy of the incident light and output laser light of a specific wavelength according to the concentration of the carbon quantum dots in the carbon quantum dot solution and the type of organic solvent.

10. The liquid laser according to claim 1, characterized in that, The wavelength of the incident light is 532 nm.

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