Phonon laser frequency comb generation device and method based on Floquet modulation

Abstract

The present invention belongs to the field of phonon laser frequency combs, and specifically relates to a phonon laser frequency comb generation device and method based on Floquet modulation. The device includes a modulation optical path, a capture optical path, and a three-dimensional displacement stage. The wavelength division multiplexer, a gain medium, a first lens, a second lens, and the first and second optical fibers form a ring cavity. Laser light emitted by a pump laser passes through a modulator and enters the wavelength division multiplexer, where it is divided into two beams in opposite directions. The laser light passes through the gain medium and propagates in the ring cavity. The two beams of light are respectively converged and aligned by the first and second lenses to form an intracavity light trap, which also has a light trapping force for particles. The signal generating device generates a Floquet modulation signal and transmits it to the modulator to periodically modulate the power of the light. In principle, the device eliminates the strong nonlinear effect required in a system for generating a phonon frequency comb, thereby improving the performance of the system, increasing stability, and reducing the difficulty of control and optimization.

Description

Technical Field

[0001] The present invention belongs to the field of phonon laser frequency combs, and in particular relates to a phonon laser frequency comb generating device and method based on Floquet modulation. Background Art

[0002] A frequency comb is a series of equally spaced frequency lines arranged like comb teeth on a spectrum. It has a wide range of applications in quantum optics and precision measurement, including measuring energy level transitions in atoms and molecules, serving as an ultra-high-precision time and frequency benchmark, and accurately measuring the speed of light. A phonon frequency comb is the acoustic analog of a frequency comb and refers to a coherent phonon state that manifests as a series of equally spaced frequency peaks. The research and application of phonon frequency combs are constantly evolving, offering new possibilities for exploring new physical phenomena and developing novel quantum technologies. A phonon laser frequency comb, based on a phonon frequency comb, pushes each frequency comb tooth into a coherent state, achieving phonon lasers with strong coherence and stability. With advances in experimental technology, phonon laser frequency combs may play an important role in quantum computing, precision measurement, and sensor technology in the future.

[0003] Frequency combs are generally based on nonlinear effects, exploiting the nonlinear effects of light-matter interactions, such as four-wave mixing or six-wave mixing, to produce nonlinear frequency conversion, thereby forming multiple frequency lines in the frequency domain. The dynamics of nonlinear systems are more complex than those of linear systems and are susceptible to parameter fluctuations and environmental perturbations, which can reduce stability and increase the difficulty of control and optimization. Furthermore, the nonlinear conversion process is accompanied by increased losses and noise, limiting the performance of the frequency comb. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a phonon laser frequency comb generation device and method based on Floquet modulation, which gets rid of the strong nonlinear effect required in the system for generating the phonon frequency comb, thereby improving the performance of the frequency comb, increasing stability, and reducing the difficulty of control and optimization.

[0005] The present invention provides a phonon laser frequency comb generation device and method based on Floquet modulation, comprising: a modulation optical path, a capture optical path, and a three-dimensional translation stage, wherein the modulation optical path is mounted on the three-dimensional translation stage and is used to enable the modulation optical path to move three-dimensionally relative to the capture optical path;

[0006] The capture optical path includes a laser, a beam splitter, optical fiber 3, optical fiber 4, and a vacuum cavity. Particles are contained in the vacuum cavity. Laser light emitted by the laser is split by the beam splitter into two beams of equal power, which propagate along optical fiber 3 and optical fiber 4, respectively, and are emitted from the ends of optical fiber 3 and optical fiber 4 in opposite directions into the vacuum cavity to irradiate the particles, thereby achieving stable capture of the particles.

[0007] The modulated optical path includes a pump laser, a modulator, a signal generator, a wavelength division multiplexer, a gain medium, lens 1, lens 2, optical fiber 1, and optical fiber 2. The wavelength division multiplexer, gain medium, lens 1, lens 2, optical fiber 1, and optical fiber 2 constitute a ring cavity. The laser light emitted by the pump laser passes through the modulator and enters the wavelength division multiplexer to be divided into two beams in opposite directions. The laser light passes through the gain medium and propagates in the ring cavity. The two beams of light are respectively converged and aligned by lens 1 and lens 2 to form an intracavity light trap, which also has a light trapping power for particles. The signal generator generates a Floquet modulation signal and transmits it to the modulator to periodically modulate the power of the light.

[0008] Optionally, the frequency of the Floquet modulation signal is 100 Hz-20 kHz.

[0009] Optionally, the modulator is an acousto-optic modulator, an electro-optic modulator or a magneto-optical modulator.

[0010] Optionally, the gain medium is an optical fiber doped with a rare earth element, and the rare earth element is ytterbium, erbium, rubidium or thulium.

[0011] Optionally, the length of the gain medium is 50 cm-80 cm.

[0012] Optionally, the number of the microparticle is one, the diameter is 1 μm-10 μm, and the refractive index is greater than 1.

[0013] Optionally, the Floquet modulation-based phonon laser frequency comb generating device further includes a position detector facing the vacuum cavity for detecting position signals of the particles.

[0014] Optionally, the pump laser output laser center wavelength is 976nm, and the output power is 35mW.

[0015] A method for generating a phonon laser frequency comb, using the phonon laser frequency comb generating device based on Floquet modulation, comprises the following steps:

[0016] Turn on the laser in the capture light path, adjust the alignment of the two capture light beams to capture the particles, and then pump air to increase the vacuum degree in the vacuum chamber;

[0017] Turn on the pump laser in the modulated optical path and adjust the position and pitch angle of lens 1 and lens 2 so that the beams on both sides are aligned to achieve maximum optical power in the intracavity light trap.

[0018] The relative positions of the modulation optical path and the capture optical path are adjusted by a three-dimensional translation stage, so that the particle falls on the specified position of the inner cavity optical trap in the modulation optical path, so that phonon laser is excited on the particle;

[0019] A periodic signal with the required comb tooth spacing frequency is applied to the modulator through a signal generator, and the Floquet modulation technology is used to modulate the power of the pump laser. The comb tooth spacing is adjusted by changing the frequency of the applied modulation signal, and the intensity of the applied modulation signal is changed, thereby changing the modulation depth and adjusting the number of comb teeth to achieve the required phonon laser frequency comb.

[0020] Optionally, in the phonon laser frequency comb generation method, the vacuum degree in the vacuum cavity is 200Pa-3kPa.

[0021] The present invention is based on the following principles:

[0022] Floquet modulation relies on the time-periodic drive of the system. Generally, a system can be described by Hamiltonian. After using Floquet modulation, the Hamiltonian of the system becomes time-periodic, that is, , where T is the period of modulation. Then the Schrödinger equation describing the energy of the system can be written as

[0023] (1)

[0024] According to Floquet theory, the wave function of this time-dependent Schrödinger equation can be written as

[0025] , (2)

[0026] Among them, ε is called quasi-energy, Floquet mode and H ( t ) have the same time periodicity, that is, Then the solution (2) is brought into the Schrödinger equation. Using this representation, the time-dependent Schrödinger equation is mapped to an eigenvalue problem, and the eigenvalue equation of the quasi-energy is obtained as

[0027] (3)

[0028] Will and the eigenfunctions of the quasi-energy By frequency Perform Fourier expansion:

[0029] (4)

[0030] (5)

[0031] In order to transform this time-dependent problem into a time-independent problem, it is necessary to construct an infinite-dimensional Floquet matrix in an extended Hilbert space and use a time-independent effective Hamiltonian function Instead of describing the system. If the probe is at a multiple of the driving period, then the time evolution operator can be given.

[0032] To explain Floquet modulation from the perspective of classical mechanics, we can use the Floquet modulation of phonon laser in an active suspended cavity optomechanical system as an example. When the suspended particles in the system excite the phonon laser, the motion in the time domain can be simplified to , that is, an amplitude of A 0, simple harmonic motion with a frequency of Ω0. mod The signal periodically modulates the power of the pump laser in the system, so that the motion phase of the microsphere is also modulated by the same period. Then the motion description of the particle changes to

[0033] , (6)

[0034] in, η is the depth of modulation. Using the Jacobi-Anger expansion, we can use the first kind of Bessel function J n To describe the motion state of the particles after modulation:

[0035] (7)

[0036] It can be noticed that increasing the modulation depth η , power will be used in ω L ± n ω mod (n>1) produces sidebands at frequencies | α ±n | 2 When appropriate modulation depth and modulation frequency are selected, a phonon laser frequency comb based on Floquet modulation can be realized.

[0037] The present invention has the beneficial effect of fundamentally eliminating the strong nonlinear effects required in systems generating phonon frequency combs, thereby improving frequency comb performance, increasing stability, and reducing the difficulty of control and optimization. This invention incorporates Floquet modulation into phonon lasers. Utilizing the Floquet principle, periodic modulation is applied to the system, generating multi-order sidebands on either side of the phonon laser's frequency peak. Adjusting the frequency of the modulation signal controls the spacing of the sidebands, while adjusting the modulation signal's intensity (i.e., modulation depth) controls the height of the sidebands, enabling the generation and flexible control of a phonon laser frequency comb. Thanks to the fully controllable frequency and intensity of the modulation signal, the spacing and number of the frequency comb teeth are flexibly controllable over a wide adjustment range. Furthermore, the phonon laser frequency comb generated by this invention exhibits higher coherence than traditional phonon frequency combs, facilitating its application in fields such as precision measurement and imaging. In summary, the present invention offers advantages such as simple structure, good repeatability, and strong practicality. Furthermore, the present invention is not limited to light trap structures or optical path configurations, thus extending its applicability to a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the structure of the phonon laser frequency comb generator based on Floquet modulation of the present invention;

[0039] Figure 2 This is a schematic diagram showing the relationship between the tooth spacing and modulation frequency of the phonon laser frequency comb of the present invention;

[0040] Figure 3 This is a diagram showing the experimental results of the relationship between the comb tooth spacing and the modulation frequency of the phonon laser frequency comb of the present invention;

[0041] Figure 4 This is a principle diagram of the relationship between the comb tooth intensity and modulation depth of the phonon laser frequency comb of the present invention;

[0042] Figure 5 This is a graph showing the experimental results of the relationship between the comb tooth intensity and modulation depth of the phonon laser frequency comb of the present invention.

[0043] In the figure: 101, pump laser; 102, modulator; 103, signal generator; 104, wavelength division multiplexer; 105, gain medium; 106, lens 1; 107, lens 2; 108, optical fiber 1; 109, optical fiber 2; 201, laser; 202, beam splitter; 203, particle; 204, vacuum chamber; 205, optical fiber 3; 206, optical fiber 4; 30, modulated optical path; 40, position detector. DETAILED DESCRIPTION

[0044] like Figure 1As shown, the present invention provides a phonon laser frequency comb generation device based on Floquet modulation, comprising: a modulation optical path 30, a capture optical path and a three-dimensional translation stage, wherein the modulation optical path 30 is mounted on the three-dimensional translation stage for enabling the modulation optical path 30 to move three-dimensionally relative to the capture optical path;

[0045] The capture optical path includes a laser 201, a beam splitter 202, an optical fiber 3 205, an optical fiber 4 206, and a vacuum chamber 204. A particle 203 is contained in the vacuum chamber 204. Laser light emitted by the laser 201 is split by the beam splitter 202 into two beams of equal power. The beams propagate along the optical fiber 3 205 and the optical fiber 4 206, respectively. The beams are then emitted from the ends of the optical fiber 3 205 and the optical fiber 4 206 in opposite directions into the vacuum chamber 204, irradiating the particle 203 therein, thereby achieving stable capture of the particle 203.

[0046] The modulation optical path 30 includes a pump laser 101, a modulator 102, a signal generator 103, a wavelength division multiplexer 104, a gain medium 105, a lens 106, a lens 2 107, an optical fiber 108, and an optical fiber 2 109. The wavelength division multiplexer 104, the gain medium 105, the lens 106, the lens 2 107, the optical fiber 108, and the optical fiber 2 109 constitute a ring cavity. The laser light emitted by the pump laser 101 passes through the modulator 102 and enters the wavelength division multiplexer 104, where it is divided into two beams in opposite directions. The two beams then propagate in the ring cavity through the gain medium 105. The two beams are converged and aligned by lens 106 and lens 2 107, respectively, to form an intracavity light trap, which also has a light trapping force for the particle 203. The signal generator 103 generates a Floquet modulation signal and transmits it to the modulator 102 to periodically modulate the power of the light.

[0047] Compared to existing technologies, the phonon laser frequency comb generator based on Floquet modulation provided by the present invention fundamentally eliminates the strong nonlinear effects required in phonon frequency comb generation systems, resulting in improved frequency comb performance, increased stability, and reduced control and optimization. This invention incorporates Floquet modulation into phonon lasers. Leveraging the Floquet principle, the system is periodically modulated, generating multi-order sidebands on either side of the phonon laser's frequency peak. Adjusting the frequency of the modulation signal controls the spacing of the sidebands, while adjusting the modulation signal's intensity (i.e., modulation depth) controls the height of the sidebands, enabling the generation and flexible control of the phonon laser frequency comb. Thanks to the fully controllable frequency and intensity of the modulation signal, the spacing and number of the frequency comb teeth are flexibly controllable over a wide adjustment range. Furthermore, the phonon laser frequency comb generated by this invention exhibits higher coherence than traditional phonon frequency combs, facilitating its application in fields such as precision measurement and imaging. In summary, the present invention offers advantages such as simple structure, good repeatability, and strong practicality. Furthermore, the present invention is not limited to light trap structures or optical path configurations, thus extending its applicability to a wider range of applications.

[0048] Working principle of the present invention:

[0049] In the capture optical path, the laser emitted by laser 201 is split into two beams of equal power by beam splitter 202. The two beams propagate along optical fiber 3 205 and optical fiber 4 206, respectively. Finally, the two optical fibers are emitted from opposite ends, enter the vacuum chamber, and irradiate the particles 203 therein, achieving stable capture of the particles.

[0050] In the modulation optical path 30, the wavelength division multiplexer 104, the gain medium 105, the optical fiber 108, the lens 106, the lens 2 107 and the optical fiber 2 109 form a ring cavity. The laser emitted by the pump laser 101 passes through the modulator 102 and enters the Pass end of the wavelength division multiplexer 104, is emitted from the Common end, and enters the gain medium 105. The gain medium 105 provides gain for the ring cavity to ensure that the gain is greater than the loss, so that the laser can be pumped out. The pumped laser propagates counterclockwise along the optical fiber 108 and diffuses into the free space at the end face. It is converged by the lens 106. The divergent light after convergence is converged by the lens 2 107 and enters the optical fiber 2 109 and continues to propagate to the Reflect end of the wavelength division multiplexer 104. The light at the Reflect end is reflected and propagates clockwise along the optical fiber 2 109 to the end face, diffuses into the free space, and is converged by the lens 2 107. The divergent light after convergence is along The light is focused by lens 106 and enters optical fiber 108 to continue propagating. After passing through the gain medium 105, it enters the common end of the wavelength division multiplexer 104, and then propagates to the reflect end and is reflected. The reflected light is emitted from the common end, and the above process is repeated. At this point, the pumped laser propagates in the ring cavity, and the clockwise and counterclockwise light beams can be transmitted simultaneously in the cavity. The counterclockwise light is focused by lens 106, and the clockwise light is focused by lens 2 107. After the two beams are aligned, an intracavity light trap is formed, which also has a capture light force on the particle 203. The magnitude of the light force is proportional to the magnitude of the light power in the intracavity. The entire modulated optical path 30 is installed on a three-dimensional displacement stage and can be moved three-dimensionally relative to the capture light path. The relative position of the capture light path and the modulated optical path 30 is adjusted by the three-dimensional displacement stage, and then the different positions of the particle 203 in the intracavity light trap are adjusted to adjust the loss of the scattered light to the intracavity light trap, thereby exciting phonon laser.

[0051] The position detector 40 is used to detect the position signal of the microparticle 203 to analyze the motion state of the microparticle 203 and obtain the microsphere displacement power spectrum. It can be seen that the displacement power spectrum line width is narrowed and the amplitude is increased, showing the characteristics of phonon laser;

[0052] The signal generator 103 generates the required Floquet modulation signal. The frequency of the signal is the comb tooth spacing of the frequency comb. The intensity of the signal determines the number of comb teeth of the frequency comb. After the modulation signal enters the modulator 102, the power of the laser emitted by the pump laser 101 can be periodically modulated according to the modulation signal frequency and amplitude. The microsphere displacement power spectrum obtained by the position detector 40 shows multiple frequency peaks, realizing the phonon laser frequency comb.

[0053] The main components used in the following specific implementations are described as follows:

[0054] The pump laser 101 is a single-mode diode laser 201BL976-PAG900 from Thorlabs, with an output laser center wavelength of 976 nm and a fiber-coupled output power of 35 mW.

[0055] The modulator 102 is integrated into the controller of the pump laser 101 (CLD1015 from Thorlabs).

[0056] The signal generator is DG1402 from RIGOL. Figure 3 The output sinusoidal signal frequencies are 500Hz, 700Hz and 1kHz, and the amplitude is 100mV; Figure 5 The frequency of the output sinusoidal signal is 2kHz, and the amplitudes are 10mV, 40mV, 70mV and 240mV;

[0057] The gain medium 105 is a 60 cm section of ytterbium-doped optical fiber, Yb1200-6 / 125 produced by nLIGHT, with a core diameter of 6 μm and a cladding diameter of 125 μm.

[0058] The capture laser is an Axiom 532 produced by Laser Quantum, with an output power of 800mW;

[0059] The microparticles 203 are single silica microspheres with a diameter of 2 μm;

[0060] The position detector 40 is composed of a D-type reflective mirror and PDB450A from Thorlabs.

[0061] A method for generating a phonon laser frequency comb comprises the following steps:

[0062] Turn on the laser 201 in the capture light path, adjust the alignment of the two capture light beams to capture the particles 203, and then pump air to increase the vacuum degree in the vacuum chamber 204;

[0063] Turn on the pump laser 101 in the modulated optical path 30, and adjust the position and pitch angle of lens 1 106 and lens 2 107 so that the two beams are aligned to achieve maximum optical power in the intracavity light trap;

[0064] The relative positions of the modulating optical path 30 and the trapping optical path are adjusted by a three-dimensional translation stage, so that the particle 203 falls on a designated position of the inner cavity optical trap in the modulating optical path 30, so that phonon laser is excited on the particle 203;

[0065] A periodic signal of the required comb tooth spacing frequency is applied to the modulator 102 through the signal generating device 103, and the power of the pump laser is modulated using the Floquet modulation technique. The comb tooth spacing is adjusted by changing the frequency of the applied modulation signal, and the intensity of the applied modulation signal is changed, thereby changing the modulation depth and adjusting the number of comb teeth to achieve the required phonon laser frequency comb.

[0066] Figure 2 and Figure 3 The relationship between the phonon laser frequency comb and the modulation frequency, and the relationship between the frequency of the modulation signal and the comb tooth spacing are shown in the schematic diagram. Figure 2 As shown, assuming the applied frequency is Ω mod If the modulation signal is Ω0, multiple sidebands will appear on both sides of the phonon laser with the original frequency of Ω0, such as Ω +1 ,Ω +2 ,Ω -1 ,Ω -2 etc., and the interval between the sidebands is equal to the modulation signal frequency Ω mod ; Give an experimental result diagram as follows Figure 3 As shown in the figure, the displacement power spectrum of the microsphere shows that after increasing the modulation frequency, the interval of the frequency comb teeth remains consistent with the modulation frequency; Figure 3 The modulation frequency of the upper figure is 500Hz, and the corresponding comb tooth interval is 500Hz; the modulation frequency of the middle figure is 700Hz, and the corresponding comb tooth interval is 700Hz; the modulation frequency of the lower figure is 1kHz, and the corresponding comb tooth interval is 1kHz.

[0067] Figure 4 and Figure 5 The relationship between the phonon laser frequency comb and the modulation depth is shown in the figure below. Figure 4 As shown, the intensity of the modulation signal determines the depth of the modulation. The greater the modulation depth, the greater the sideband intensity generated by Floquet modulation, and thus the better the uniformity of the frequency comb. An experimental result is shown in FIG. Figure 5 As shown in the figure, the number of teeth and uniformity of the frequency comb are related to the modulation depth through the microsphere displacement power spectrum. The greater the modulation depth, the more teeth the frequency comb has and the better the uniformity. The phonon self-coherence function of each comb tooth, which characterizes the coherence of the phonon laser frequency comb, is close to 1. Figure 5 The comb teeth spacing is 2kHz, the number of comb teeth is more than 40, and the frequency stability is characterized by the frequency standard deviation of 0.022Hz.

[0068] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0069] The one or more embodiments of this application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application should be included in the scope of protection of this application.

Claims

1. A phonon laser frequency comb generator based on Floquet modulation, characterized in that: include: A modulating optical path (30), a capturing optical path, and a three-dimensional displacement stage, wherein the modulating optical path (30) is mounted on the three-dimensional displacement stage and is used to enable the modulating optical path (30) to move three-dimensionally relative to the capturing optical path; The capture optical path comprises a laser (201), a beam splitter (202), an optical fiber three (205), an optical fiber four (206), and a vacuum cavity (204); a particle (203) is contained in the vacuum cavity (204); laser light emitted by the laser (201) is split into two beams of light with equal power by the beam splitter (202), and propagates along the optical fiber three (205) and the optical fiber four (206), respectively, and is emitted from the ends of the optical fiber three (205) and the optical fiber four (206) in opposite directions into the vacuum cavity (204), irradiating the particle (203), thereby achieving stable capture of the particle (203); The modulation optical path (30) includes a pump laser (101), a modulator (102), a signal generating device (103), a wavelength division multiplexer (104), a gain medium (105), a lens 1 (106), a lens 2 (107), an optical fiber 1 (108) and an optical fiber 2 (109), wherein the wavelength division multiplexer (104), the gain medium (105), the lens 1 (106), the lens 2 (107), the optical fiber 1 (108) and the optical fiber 2 (109) form a ring cavity, and the pump The laser light emitted by the laser (101) passes through the modulator (102) and enters the wavelength division multiplexer (104) to be divided into two beams in opposite directions, and passes through the gain medium (105) and propagates in the ring cavity. The two beams of light are respectively converged and aligned by lens 1 (106) and lens 2 (107) to form an intracavity light trap, which also has the ability to capture light for the particle (203). The signal generating device (103) generates a Floquet modulation signal and transmits it to the modulator (102) to periodically modulate the power of the light.

2. The phonon laser frequency comb generator based on Floquet modulation according to claim 1, characterized in that: The frequency of the Floquet modulation signal is 100 Hz-20 kHz.

3. The Floquet modulation-based phonon laser frequency comb generator according to claim 1, characterized in that: The modulator (102) is an acousto-optic modulator, an electro-optic modulator or a magneto-optic modulator.

4. The phonon laser frequency comb generator based on Floquet modulation according to claim 1, characterized in that: The gain medium (105) is an optical fiber doped with a rare earth element, and the rare earth element is ytterbium, erbium, rubidium or thulium.

5. The Floquet modulation-based phonon laser frequency comb generator according to claim 1, characterized in that: The length of the gain medium (105) is 50 cm–80 cm.

6. The Floquet modulation-based phonon laser frequency comb generator according to claim 1, characterized in that: The number of the microparticle (203) is one, the diameter is 1 μm-10 μm, and the refractive index is greater than 1.

7. The phonon laser frequency comb generator based on Floquet modulation according to claim 1, characterized in that: A position detector (40) is also included and is used to detect position signals of the particles (203) facing the vacuum chamber (204).

8. The phonon laser frequency comb generator based on Floquet modulation according to claim 1, characterized in that: The pump laser (101) has an output laser center wavelength of 976 nm and an output power of 35 mW.

9. A method for generating a phonon laser frequency comb, characterized in that: Using the phonon laser frequency comb generating device based on Floquet modulation according to any one of claims 1 to 8 comprises the following steps: Turning on the laser (201) in the capture light path, adjusting the alignment of the two capture light beams to achieve capture of the particles (203), and then pumping air to increase the vacuum degree in the vacuum cavity (204); Turning on the pump laser (101) in the modulated optical path (30), adjusting the position and pitch angle of lens 1 (106) and lens 2 (107) so that the light beams on both sides are aligned, thereby achieving maximum light power in the intracavity light trap; The relative positions of the modulation optical path (30) and the capture optical path are adjusted by a three-dimensional displacement stage, so that the particle (203) falls on a specified position of the inner cavity optical trap in the modulation optical path (30), so that phonon laser is excited on the particle (203); A periodic signal of a required comb tooth spacing frequency is applied to the modulator (102) through a signal generating device (103), and the power of the pump laser is modulated using Floquet modulation technology. The comb tooth spacing is adjusted by changing the frequency of the applied modulation signal, and the intensity of the applied modulation signal is changed, thereby changing the modulation depth and adjusting the number of comb teeth to achieve the required phonon laser frequency comb.

10. The method for generating a phonon laser frequency comb according to claim 9, wherein: The vacuum degree in the vacuum cavity (204) is 200 Pa-3 kPa.

Images