CN111262122B - Optical frequency comb generating system - Google Patents

Optical frequency comb generating system Download PDF

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CN111262122B
CN111262122B CN202010066702.5A CN202010066702A CN111262122B CN 111262122 B CN111262122 B CN 111262122B CN 202010066702 A CN202010066702 A CN 202010066702A CN 111262122 B CN111262122 B CN 111262122B
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light
lens
frequency comb
idler
optical frequency
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CN111262122A (en
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尹志军
叶志霖
吴冰
许志城
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Nanjing Nanzhi Institute Of Advanced Optoelectronic Integration
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Nanjing Nanzhi Institute Of Advanced Optoelectronic Integration
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/355—Non-linear optics characterised by the materials used
    • G02F1/3551—Crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/37—Non-linear optics for second-harmonic generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/082—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/56—Frequency comb synthesizer

Abstract

The present application provides a system for generating an optical frequency comb. The system comprises a first laser transmitter for transmitting pump light, a second laser transmitter for transmitting signal light, a third laser transmitter for transmitting idler frequency light and a frequency comb generating device; wherein the frequency comb generating device comprises a nonlinear crystal; the pump light, the signal light and the idler frequency light enter the nonlinear crystal, and an optical frequency comb is generated in the nonlinear crystal due to a second-order nonlinear effect. Compared with the existing femtosecond optical frequency comb, the laser in the embodiment of the application is not a laser pulse sequence, so that the optical frequency comb generated by the generation system of the optical frequency comb in the embodiment of the application is not limited by the pulse width in the spectrum width, and the spectrum width can be easily expanded.

Description

Optical frequency comb generating system
Technical Field
The present application relates to the field of optical technology, and more particularly, to a system for generating an optical frequency comb.
Background
An Optical Frequency Comb (OFC) refers to a spectrum that is spectrally composed of a series of uniformly spaced Frequency components with coherently stable phase relationships. Similar to the normally used scale with unit length as the standard interval, if the standard interval on the scale is replaced by the length, the frequency can be measured by using the scale as if the length is measured, namely the optical frequency comb. An optical frequency comb is typically composed of tens or even thousands of laser lines with equal frequency spacing in the frequency domain, and ultrashort laser pulses in the time domain. By detecting and controlling the pulse repetition frequency of the optical frequency comb and the offset frequency between the carrier and the envelope, the measurement of any optical frequency can be realized.
With the rapid development of optical communication technology, OFC attracts more and more attention due to its wide application in the fields of optical arbitrary waveform generation, multi-wavelength ultrashort pulse generation, dense wavelength division multiplexing, and the like. The conventional optical frequency comb is generally a femtosecond optical frequency comb generated by a titanium sapphire femtosecond laser or a fiber mode-locked laser, the laser outputs a laser pulse sequence, the pulses are equally spaced in a time domain and have completely consistent phases, and therefore, a frequency spectrum corresponding to the frequency comb in the frequency domain has equal frequency intervals and stable phase relation. However, since the spectral width of the femtosecond optical frequency comb is inversely proportional to the pulse width, in order to obtain a wider frequency comb, a very short pulse is required, which increases the difficulty of spreading the spectral width.
Based on this, there is a need for an optical frequency comb generation system for solving the problem of high difficulty in spreading the spectrum width of the femtosecond optical frequency comb in the prior art.
Disclosure of Invention
The application provides a system for generating an optical frequency comb, which can be used for solving the technical problem that the difficulty of expanding the spectrum width of the femtosecond optical frequency comb in the prior art is higher.
The embodiment of the application provides a system for generating an optical frequency comb, wherein the system 1 comprises a first laser transmitter 11, a second laser transmitter 12, a third laser transmitter 13 and a frequency comb generating device 14; the frequency comb generating means 14 comprises a non-linear crystal 141;
the first laser emitter 11, the second laser emitter 12, and the third laser emitter 13 are respectively configured to emit pump light, signal light, and idler frequency light;
the pump light, the signal light, and the idler light enter the nonlinear crystal 141, and an optical frequency comb is generated in the nonlinear crystal 141 due to a second-order nonlinear effect.
Optionally, the frequency comb generating device 14 further comprises a resonant cavity, and the nonlinear crystal 141 is located in the middle of the resonant cavity;
the pump light, the signal light and the idler light enter the nonlinear crystal 141 after being reflected by the resonant cavity for multiple times, and an optical frequency comb is generated in the nonlinear crystal 141 due to a second-order nonlinear effect and a cascade effect.
Optionally, the resonant cavity includes a first lens 1421 and a second lens 1422, the first lens 1421 and the second lens 1422 are disposed oppositely, and the nonlinear crystal 141 is located between the first lens 1421 and the second lens 1422;
the pump light, the signal light and the idler light enter the nonlinear crystal 141 after being reflected for multiple times by the first lens 1421 and the second lens 1422, and an optical frequency comb is generated in the nonlinear crystal 141 due to a second-order nonlinear effect and a cascade effect.
Optionally, the system 1 further comprises a third lens 15 and a fourth lens 16; the third lens 15 allows the pump light to transmit but reflects the signal light, and the fourth lens 16 allows the pump light and the signal light to transmit but reflects part of the idler light;
after the pump light is emitted from the third lens 15, the pump light is combined with the signal light reflected by the third lens 15, the pump light is emitted from the fourth lens 16, and the combined pump light, the signal light and the idler light are combined with the idler light reflected by the fourth lens 16, the combined pump light, the signal light and the idler light enter the nonlinear crystal 141, and an optical frequency comb is generated in the nonlinear crystal 141 due to a second-order nonlinear effect.
Optionally, the first laser emitter 11, the third lens 15, the fourth lens 16 and the frequency comb generating device 14 are located on a first straight line, a connection line of the second laser emitter 12 and the third lens 15 is perpendicular to the first straight line, and a connection line of the third laser emitter 13 and the fourth lens 16 is perpendicular to the first straight line.
Optionally, the system 1 further comprises a dichroic mirror 17;
the dichroic mirror 17 is located between the first laser emitter 11 and the frequency comb generating device 14, and is configured to combine the pump light, the signal light, and the idler light.
Optionally, the nonlinear crystal 141 is composed of a magnesium-doped lithium niobate crystal.
Optionally, the magnesium-doped lithium niobate crystal is formed with a first reciprocal lattice vector and a second reciprocal lattice vector;
the period of the first reciprocal lattice vector is 32.7 μm, and the period of the second reciprocal lattice vector is 400 μm.
Optionally, the second order nonlinear effect comprises at least one of an OPA effect, an SFG effect, a DFG effect, and an OPO effect.
Optionally, in the nonlinear crystal 141, the pump light transfers energy to the signal light and the idler light under the OPA effect, the signal light and the idler light interact with each other to generate THz light through the DFG effect, the signal light and the THz light sum frequency, and the idler light and the THz light difference frequency to generate an optical frequency comb.
In the embodiment of the application, three lasers are adopted to respectively emit the pump light, the signal light and the idler frequency light, and after the pump light, the signal light and the idler frequency light are emitted into the frequency comb generating device, the optical frequency comb can be generated due to the second-order nonlinear effect. Compared with the existing femtosecond optical frequency comb, the laser in the embodiment of the application is not a laser pulse sequence, so that the optical frequency comb generated by the generation system of the optical frequency comb in the embodiment of the application is not limited by the pulse width in the spectrum width, and the spectrum width can be easily expanded.
Drawings
Fig. 1 is a schematic structural diagram of a system for generating an optical frequency comb according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another optical frequency comb generating system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a system for generating an optical frequency comb including a dichroic mirror according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating a positional relationship between laser emitters according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of the present application;
FIG. 6 is a schematic diagram of an optical frequency comb generation process according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of an optical frequency comb according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In the prior art, in addition to femtosecond optical frequency combs, the optical frequency combs can also be generated by a third-order nonlinear effect. Specifically, the silicon (Si) and silicon dioxide (SiO) may be used2) Or magnesium fluoride (MgF)2) The material forms echo wall micro-cavity (WGM), and the third order non-linear effect (Kerr effect) of the material is utilized to generate the optical frequency comb.
However, since the third order nonlinear effect has a smaller nonlinear coefficient, the strength of the optical frequency comb produced by this method is also smaller.
Based on the problem that the difficulty of the femtosecond optical frequency comb for expanding the spectrum width is high and the problem that the strength of the optical frequency comb generated by the third-order nonlinear effect is low, the embodiment of the application provides a generation system of the optical frequency comb, which can expand the spectrum width on one hand and increase the strength of the optical frequency comb on the other hand.
Please refer to fig. 1, which schematically illustrates a schematic structural diagram of a system for generating an optical frequency comb according to an embodiment of the present application. The system 1 may include a first laser transmitter 11, a second laser transmitter 12, a third laser transmitter 13, and a frequency comb generation device 14.
Wherein, the frequency comb generating device 14 may include a nonlinear crystal 141; the first laser transmitter 11 may be used to transmit pump light, the second laser transmitter 12 may be used to transmit signal light, and the third laser transmitter 13 may be used to transmit idler light.
As can be seen from fig. 1, the pump light, the signal light and the idler light enter the nonlinear crystal 141, and an optical frequency comb may be generated in the nonlinear crystal 141 due to a second-order nonlinear effect.
It should be noted that, in the embodiment of the present application, a single-frequency near-infrared laser with a wavelength of 1064nm may be used as the pump light, where the repetition frequency is 10Hz, the pulse energy is 100 μ J, and the pulse length is 5 ns. The second laser transmitter 12 and the third laser transmitter 13 may employ DFB semiconductor lasers, in which the wavelength (λ) of the signal light emitted from the second laser transmitter 121) Which may be 2128nm, the wavelength (λ) of the idler light emitted by the third laser emitter 132) May be 2133.4nm, and the wavelength between the signal and idler may differ by 5.4 nm.
In the embodiment of the application, three lasers are adopted to respectively emit the pump light, the signal light and the idler frequency light, and after the pump light, the signal light and the idler frequency light are emitted into the frequency comb generating device, the optical frequency comb can be generated due to the second-order nonlinear effect. Compared with the existing femtosecond optical frequency comb, the laser in the embodiment of the application is not a laser pulse sequence, so that the optical frequency comb generated by the generation system of the optical frequency comb in the embodiment of the application is not limited by the pulse width in the spectrum width, and the spectrum width can be easily expanded.
Further, compared with the optical frequency comb generated by the third-order nonlinear effect in the prior art, the strength of the generated optical frequency comb is higher in the generation system of the optical frequency comb provided by the embodiment of the application.
In the embodiment of the present application, the nonlinear crystal 141 may be formed of a magnesium-doped lithium niobate crystal. The nonlinear crystal 141 is an X-cut, i.e., two parallel cut and polished films perpendicular to the X-axis, with high transmission for pump light wavelengths and high reflection for signal and idler wavelengths, thus forming a mirror for OPO. The distance between the parallel two faces is 0.2 mm. In the vicinity of laser with a wavelength of 2128nm, according to a Selimeier equation, the refractive index of MgO: LN at room temperature is 2.11, and the longitudinal mode interval Δ ν of the resonator is 0.36THz, which allows injection resonance of the signal light output from the second laser transmitter 12 and the idler frequency light output from the third laser transmitter 13 in the resonator.
Further, the magnesium-doped lithium niobate crystal may be formed with a first reciprocal lattice vector and a second reciprocal lattice vector, wherein the period of the first reciprocal lattice vector is 32.7 μm, and the period of the second reciprocal lattice vector is 400 μm. Specifically, the magnesium-doped lithium niobate crystal may be polarized by a room-temperature electric field polarization method to form a superlattice having two inverted vectors. According to the above parameters, the period Λ of the first reciprocal lattice vector is such that the OPA process is satisfied132.7 μm, period Λ of the second reciprocal lattice vector2400 μm. Due to the period Λ2Already longer than the crystal length, so according to the Cavity Phase Matching theory, the second reciprocal lattice vector can achieve Matching without polarization at this time. Thus, the final periodically poled lithium niobate MgO-PPLN has a period of 32.7 μm.
It should be noted that the above matching process may adopt Type-0 matching, i.e. the polarization directions of the incident pump light, signal light and idler light are all parallel to the Z-axis of the nonlinear crystal 141.
In the embodiment of the present application, the second-order nonlinear effect includes at least one of an Parametric Amplification (OPA) effect, a Sum Frequency (SFG) effect, a Difference Frequency (DFG) effect, and a Parametric oscillation (OPO) effect. That is, in the nonlinear crystal 141, the pump light transfers energy to the signal light and the idler light under the OPA effect, the signal light and the idler light interact with each other, the THz light is generated by the DFG effect, the signal light and the THz light sum frequency, and the idler light and the THz light difference frequency, and the optical frequency comb is generated.
Further, the first reciprocal lattice vector may be used to match the OPA process; the second reciprocal lattice vector can be used to match the DFG, SFG process. The first reciprocal lattice vector can be implemented by a Quasi-Phase Matching (QPM), for example, a superlattice crystal with a cascade, bi-periodic, Quasi-periodic or non-periodic structure; the second reciprocal lattice vector can be implemented in a Cavity Phase Matching (CPM) manner.
Fig. 2 schematically shows a structural diagram of another optical frequency comb generation system provided in the embodiment of the present application. As shown in fig. 2, the frequency comb generating device 14 may further include a resonant cavity, and the nonlinear crystal 141 may be located in the middle of the resonant cavity.
Thus, the pump light, the signal light and the idler light enter the nonlinear crystal 141 after being reflected by the resonant cavity for multiple times, and an optical frequency comb is generated in the nonlinear crystal 141 due to a second-order nonlinear effect and a cascade effect.
The specific structure of the resonant cavity may be various, and in an example, as shown in fig. 2, a schematic structural diagram of a resonant cavity provided in the embodiments of the present application is provided. The resonator cavity may include a first lens 1421 and a second lens 1422, wherein the first lens 1421 and the second lens 1422 are disposed opposite to each other, and the nonlinear crystal 141 may be disposed between the first lens 1421 and the second lens 1422.
Thus, the pump light, the signal light and the idler light enter the nonlinear crystal 141 after being reflected by the first lens 1421 and the second lens 1422 for multiple times, and an optical frequency comb is generated in the nonlinear crystal 141 due to a second-order nonlinear effect and a cascade effect.
In another example, the resonant cavity may be formed after processing the nonlinear crystal 141. For example, a resonator may be formed by polishing the nonlinear crystal 141 itself, or a whispering gallery type resonator may be formed by machining, etching, or the like.
The cascade effect can be further enhanced and the spectral width can be further extended by using a generation system of an optical frequency comb comprising a resonant cavity.
In this embodiment of the application, the pump light emitted by the first laser emitter 11, the signal light emitted by the second laser emitter 12, and the idler frequency light emitted by the third laser emitter 13 may enter the nonlinear crystal 141 in parallel, and then the pump light, the signal light, and the idler frequency light may be combined.
In the embodiment of the present application, a dichroic mirror may be used for beam combining. Fig. 3 is a schematic structural diagram of a system for generating an optical frequency comb including a dichroic mirror according to an embodiment of the present application. Wherein the system 1 may further comprise a dichroic mirror 17.
As shown in fig. 3, the dichroic mirror 17 may be located between the first laser emitter 11 and the frequency comb generating device 14 for combining the pump light, the signal light and the idler light into a beam.
In the embodiment of the present application, the positional relationship among the first laser transmitter 11, the second laser transmitter 12 and the third laser transmitter 13 may be various, and in one example, the positional relationship among the first laser transmitter 11, the second laser transmitter 12 and the third laser transmitter 13 may be as shown in fig. 1.
In another example, as shown in fig. 4, a schematic diagram of a positional relationship between laser emitters is provided in an embodiment of the present application. The system 1 may further comprise a third lens 15 and a fourth lens 16.
The first laser transmitter 11, the third lens 15, the fourth lens 16 and the frequency comb generating device 14 may be located on a first straight line (e.g., L1 shown in fig. 4), a line connecting the second laser transmitter 12 and the third lens 15 (e.g., L2 shown in fig. 4) may be perpendicular to the first straight line (e.g., L1 in fig. 4), and a line connecting the third laser transmitter 13 and the fourth lens 16 (e.g., L3 shown in fig. 4) may be perpendicular to the first straight line (e.g., L1 in fig. 4).
Further, the third lens 15 may allow the pump light to transmit but reflect the signal light, and the fourth lens 16 may allow the pump light and the signal light to transmit but reflect a part of the idler light.
In this way, after the pump light is emitted from the third lens 15, the pump light can be combined with the signal light reflected by the third lens 15, then emitted from the fourth lens 16, and combined with the idler light reflected by the fourth lens 16, and the combined pump light, signal light, and idler light can enter the nonlinear crystal 141, so that the optical frequency comb is generated in the nonlinear crystal 141 due to the second-order nonlinear effect.
Further, taking the structure shown in fig. 4 as an example, a dichroic mirror 17 for combining the pump light, the signal light and the idler light may be disposed between the fourth lens 16 and the frequency comb generating device 14 (not shown in fig. 4).
To facilitate an understanding of the present application, the principles of the present application are briefly described below in conjunction with fig. 5.
As shown in fig. 5, pump light (wavelength λ) and signal light (λ)1) And idler (λ)2) Based on second-order nonlinear effect interaction, wherein1＜λ2The center frequencies of the signal and idler light differ by about THz (on the order of nm). Specifically, under the OPA effect, the energy of the pump light is transferred to the signal light and the idler light; the signal light and the idler frequency light interact to generate THz light through DFG effect; the signal light and the THz light are subjected to sum frequency to generate a wavelength lambda0The light of (2); the idle frequency light and the THz light carry out difference frequency to generate the wavelength of lambda3The light of (2); meanwhile, the OPA effect is generated by the process under the action of the pump light, and the wavelength is lambda0Of light and having a wavelength of lambda3The intensity of the light of (1) is enhanced. The above process occurs repeatedly in cascade at λ0And λ3And more wavelengths are generated to form a comb-like optical frequency. Since the interaction of these spectra with each other is produced by the THz cascade, the frequencies are equally spaced from each other; and because the phases of the initial pump light, the signal light and the idler light are determined, the frequency combs generated by cascading have a determined phase relationship, thereby forming the optical frequency combs.
In order to more clearly describe the generation system of the optical frequency comb provided in the embodiment of the present application, a process of generating the optical frequency comb by the system is described below with reference to fig. 6.
Fig. 6 is a schematic diagram of an optical frequency comb generation process according to an embodiment of the present disclosure. Figure 6 shows a degenerate OPA process with parametric bandwidth centered at 2128nm, with bandwidth widths of about hundreds of nanometers, supporting sufficiently wide frequency comb generation.
In the specific production process, first, the degenerate OPA is provided with seed light, i.e., signal light (wavelength λ) emitted from the second Laser emitter 12(Laser1)1) And an idler light (wavelength lambda) emitted by the third Laser transmitter 13(Laser2)2) In the case of injection, the seed light is amplified to generate a high-intensity signal light (wavelength λ)1) And idler (wavelength λ)2) (ii) a Signal light (wavelength lambda)1) And idler (wavelength λ)2) According to both of the DFG effectsFrequency separation, difference frequency light (wavelength lambda) produced3) The frequency was 0.36 THz. The difference frequency light and the signal light (wavelength lambda)1) Under the SFG effect, the generated wavelength is lambda0A spectrum of (wherein, λ)02122.6 nm); the wavelength generated by the SFG and DFG effects is λ0Of light and having a wavelength of lambda3The light intensity of (2) is weaker; however, the seed light as OPA has a wavelength of λ after being amplified by the pump light0Of light and having a wavelength of lambda3The intensity of the light is enhanced to reach and wavelength lambda1Of light and having a wavelength of lambda2Compared to the intensity of light of (a).
The above process is repeated until reaching a location where the parametric bandwidth of the OPA cannot support the continued broadening of the spectrum, eventually forming an optical frequency comb near 2128nm, as shown in fig. 7.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (8)

1. An optical frequency comb generation system, characterized in that the system (1) comprises a first laser emitter (11), a second laser emitter (12), a third laser emitter (13) and a frequency comb generation device (14); the frequency comb generation device (14) comprises a nonlinear crystal (141);
the first laser emitter (11), the second laser emitter (12) and the third laser emitter (13) are respectively used for emitting pump light, signal light and idler frequency light;
the pump light, the signal light and the idler frequency light enter the nonlinear crystal (141), the energy of the pump light is transferred to the signal light and the idler frequency light under the OPA effect, the signal light and the idler frequency light interact with each other, THz light is generated through the DFG effect, the sum frequency of the signal light and the THz light is generated, the difference frequency of the idler frequency light and the THz light is generated, and an optical frequency comb is generated.
2. The system according to claim 1, wherein said frequency comb generation means (14) further comprises a resonant cavity, said nonlinear crystal (141) being located in the middle of said resonant cavity;
and the pump light, the signal light and the idler light enter the nonlinear crystal (141) after being reflected by the resonant cavity for multiple times, and an optical frequency comb is generated in the nonlinear crystal (141) due to a second-order nonlinear effect and a cascade effect.
3. The system of claim 2, wherein the resonant cavity comprises a first lens (1421) and a second lens (1422), the first lens (1421) and the second lens (1422) being disposed opposite, the nonlinear crystal (141) being located intermediate the first lens (1421) and the second lens (1422);
the pump light, the signal light and the idler light enter the nonlinear crystal (141) after being reflected for multiple times by the first lens (1421) and the second lens (1422), and an optical frequency comb is generated in the nonlinear crystal (141) due to a second-order nonlinear effect and a cascade effect.
4. The system according to claim 1, characterized in that the system (1) further comprises a third lens (15) and a fourth lens (16); the third lens (15) allows the pump light to transmit but reflects the signal light, and the fourth lens (16) allows the pump light and the signal light to transmit but reflects part of the idler light;
after being emitted from the third lens (15), the pump light is combined with the signal light reflected by the third lens (15), then emitted from the fourth lens (16), and combined with the idler light reflected by the fourth lens (16), and the combined pump light, signal light and idler light enter the nonlinear crystal (141), and an optical frequency comb is generated in the nonlinear crystal (141) due to a second-order nonlinear effect.
5. The system according to claim 4, characterized in that said first laser emitter (11), said third lens (15), said fourth lens (16) and said frequency comb generation means (14) are located on a first line, the line connecting said second laser emitter (12) and said third lens (15) being perpendicular to said first line, the line connecting said third laser emitter (13) and said fourth lens (16) being perpendicular to said first line.
6. The system according to claim 1, characterized in that the system (1) further comprises a dichroic mirror (17);
the dichroic mirror (17) is located between the first laser emitter (11) and the frequency comb generation device (14) for combining the pump light, the signal light and the idler light into a beam.
7. The system of claim 1, wherein the nonlinear crystal (141) is comprised of a magnesium-doped lithium niobate crystal.
8. The system of claim 7, wherein the magnesium-doped lithium niobate crystal is formed with a first and a second reciprocal vector;
the period of the first reciprocal lattice vector is 32.7 μm, and the period of the second reciprocal lattice vector is 400 μm.
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