CN111969396A - High-integration intermediate infrared broadband super-continuum spectrum generation device and method - Google Patents
High-integration intermediate infrared broadband super-continuum spectrum generation device and method Download PDFInfo
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- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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Abstract
The invention relates to a device and a method for generating a high-integration intermediate infrared broadband supercontinuum, and solves the problems of complex structure, large volume and difficult compatibility of mode-locked laser pulse and a frequency expansion material platform in other intermediate infrared supercontinuum generation schemes. The device comprises a pumping unit, an integrated pulse generation unit, a supercontinuum generation unit, a temperature control unit and a spectrum analysis unit. In the method, a pumping unit is adjusted to emit continuous pumping laser with narrow line width; the integrated pulse generating unit receives the pump laser and generates a stable mode-locked laser pulse in the process of four-wave mixing; the super-continuum spectrum generation unit receives the mode-locked laser pulse and generates nonlinear processes such as cascade four-wave mixing and self-phase modulation to generate a mid-infrared broadband super-continuum spectrum; and the generated super-continuum spectrum waveform and bandwidth are observed by using the spectrum analysis unit, and the working temperature of the temperature control unit is adjusted at the same time, so that stable super-continuum spectrum output is realized. The invention can generate stable mode-locking laser pulse and realize high-efficiency frequency expansion.
Description
Technical Field
The invention relates to a broadband supercontinuum generation device and a method, in particular to a high-integration intermediate infrared broadband supercontinuum generation device and a method.
Background
The supercontinuum is generally formed by emitting laser pulses to a nonlinear medium and performing frequency expansion through a series of nonlinear effects, is a basic tool in laser technology research, and has wide value in numerous fundamental frontiers and the field of application science. The mid-infrared band is not only an important atmospheric window, but also is matched with heat sources such as an engine, a power facility and the like, and has remarkable significance for military applications such as radar, guidance, detection, photoelectric countermeasure, space communication and the like. Meanwhile, the mid-infrared band covers the absorption peaks of water and amino compounds, can be strongly absorbed by all substances containing hydroxyl or amino, and has important value in the field of biomedicine. Therefore, the mid-infrared supercontinuum has excellent characteristics of ultra-wide band, high brightness, high coherence and the like, and becomes an ideal light source in the fields of coherent photography, precise spectral analysis, optical coherence tomography, high-precision optical frequency measurement, wavelength division multiplexing optical communication systems and the like.
The traditional mid-infrared super-continuum spectrum generation is usually realized by tellurate, fluoride or chalcogenide glass fibers with low transmission loss in mid-infrared bands, and a Photonic Crystal Fiber (PCF) structure with a high nonlinear coefficient is taken as a core of nonlinear frequency spreading; however, the PCF and the conventional fiber device are not easy to be coupled and packaged, so that the system size is large, and the development requirements of miniaturization and integration of future information technology cannot be met.
With the development of modern micro-nano processing technology, the supercontinuum generation scheme based on the integrated nonlinear waveguide has the advantages of low loss, strong limitation, high nonlinearity, flexible and controllable dispersion and the like, and is expected to solve the bottleneck of the traditional optical fiber scheme, thereby causing wide attention of people. However, due to the limitations of the on-chip mode-locked laser pulse generation technology and the threshold power, currently, most of the on-chip mode-locked laser devices adopt external high-power optical fibers or solid mode-locked lasers as pumping light sources of nonlinear waveguides, and have high cost, large volume and low coupling efficiency; meanwhile, the compatibility of nonlinear materials which can be integrated by chips is restricted, and a mode-locked laser pulse source for pumping and a nonlinear waveguide for spectrum spreading are usually different material systems, so that the system structure is complex and the integration is difficult. How to realize the mid-infrared broadband supercontinuum with higher integration level becomes a key difficult problem restricting the wide practical application and the future technical development of the mid-infrared broadband supercontinuum.
Disclosure of Invention
The invention aims to provide a device and a method for generating a high-integration intermediate infrared broadband super-continuum spectrum, solves the problems of larger volume, complex structure, lower efficiency, difficult integration, difficult compatibility of a mode locking and spectrum expanding material platform and the like of the conventional intermediate infrared super-continuum spectrum generation system, breaks through the technical bottleneck of the prior art, and has great research significance and practical application value.
The invention adopts the micro-ring resonant cavity with high nonlinear effect in the middle infrared band and the waveguide and combines the micro-ring resonant cavity and the waveguide, thereby constructing the middle infrared broadband supercontinuum generation device with simple structure and high integration. A micro-ring resonant cavity (microcavity for short) and an integrated waveguide which are prepared by utilizing high nonlinear optical materials have micro-nano scale mode field area and super strong optical field constraint capacity, and simultaneously, broadband and flat negative dispersion can be realized by changing the geometric dimension, so that the low-threshold parametric oscillation condition can be met in a broadband range, and the stable mode-locked laser pulse generation and the efficient frequency expansion process can be realized.
In order to solve the above problems, the technical solution of the present invention is to provide a highly integrated mid-infrared broadband supercontinuum generating device, which is characterized in that: the system comprises a pumping unit, an integrated pulse generation unit, a supercontinuum generation unit, a temperature control unit and a spectrum analysis unit;
the pumping unit is used for providing continuous pumping laser with narrow line width;
the integrated pulse generating unit comprises a nonlinear integrated micro-ring resonant cavity and a direct current stabilized power supply; the nonlinear integrated micro-ring resonant cavity is connected with a direct-current stabilized power supply through inner and outer ring electrodes, the inner ring electrode is grounded (zero voltage), and the outer ring electrode is connected with the negative electrode of the direct-current stabilized power supply; the direct current stabilized voltage supply is used for providing reverse bias voltage for the nonlinear integrated micro-ring resonant cavity and inhibiting the free carrier effect in the nonlinear integrated micro-ring resonant cavity; the nonlinear integrated micro-ring resonant cavity is used for receiving pump laser and generating stable intermediate infrared band mode-locked laser pulse in the process of four-wave mixing;
the material of the super-continuum spectrum generation unit is the same as that of the nonlinear integrated micro-ring resonant cavity, the nonlinear integrated micro-ring resonant cavity is integrated on the same chip, and the super-continuum spectrum generation unit is used for receiving the intermediate infrared band mode-locked laser pulse and generating nonlinear processes such as cascade four-wave frequency mixing, self-phase modulation and the like to generate an intermediate infrared band broadband super-continuum spectrum;
the temperature control unit is used for controlling the temperature of the nonlinear integrated micro-ring resonant cavity and the supercontinuum generation unit;
the spectrum analysis unit is used for analyzing and measuring the generated mid-infrared supercontinuum.
Further, in order to receive the generated mode-locked laser pulse and realize broadband supercontinuum through a nonlinear process, the supercontinuum generating unit comprises a mode field converter and a nonlinear integrated waveguide; the input port of the mode field converter is connected with the common end of the nonlinear integrated micro-ring resonant cavity, the output port is connected with the nonlinear integrated waveguide, and the mode field converter is used for matching the mode field area of the nonlinear integrated micro-ring resonant cavity and the nonlinear waveguide and realizing high-efficiency coupling; the nonlinear integrated waveguide is used for receiving the mode-locked laser pulse and generating a nonlinear process to generate a supercontinuum.
Furthermore, in order to efficiently inject the pumping laser with high energy density into the micro-ring resonator, the pumping unit comprises a narrow linewidth tunable laser and a tapered lens fiber; the narrow-linewidth adjustable laser is used for emitting continuous pumping laser, two ends of the tapered lens optical fiber are respectively connected with the output end of the narrow-linewidth adjustable laser and the input end of the nonlinear integrated micro-ring resonant cavity, and the tapered lens optical fiber is used for efficiently coupling the emitted laser to the nonlinear integrated micro-ring resonant cavity.
Furthermore, in order to rapidly and accurately control the working temperature of the nonlinear integrated micro-ring resonant cavity, the mode field converter and the nonlinear integrated waveguide which are integrated by a single chip, the temperature control unit is a semiconductor refrigerator.
Further, the spectrum analyzing unit is a spectrum analyzer.
The invention also provides a method for realizing the generation of the intermediate infrared broadband supercontinuum based on the system, which comprises the following steps:
adjusting the average power and the central wavelength of narrow-linewidth continuous pump laser emitted by a pump unit to enable the intensity and the frequency of the pump laser to meet the intensity threshold condition and the frequency resonance condition of a four-wave mixing process obviously occurring in a nonlinear integrated micro-ring resonant cavity;
adjusting the output voltage or current of a direct current stabilized power supply in the integrated pulse generating unit until free carriers in the nonlinear integrated micro-ring resonant cavity are completely inhibited, and generating stable mode-locked laser pulses in the process of four-wave mixing;
thirdly, a super-continuum spectrum generation unit receives the intermediate infrared band mode-locked laser pulse and generates nonlinear processes such as cascade four-wave frequency mixing and self-phase modulation to generate an intermediate infrared broadband super-continuum spectrum;
and fourthly, observing the generated super-continuum spectrum waveform and bandwidth by using the spectrum analysis unit, and slightly adjusting the working temperature of the temperature control unit to realize stable super-continuum spectrum output.
Further, the first step is specifically as follows:
step 1.1, adjusting the output power of a narrow linewidth adjustable laser, and slowly increasing the central wavelength of the narrow linewidth adjustable laser until the central wavelength is slightly larger than the resonance wavelength of a nonlinear integrated micro-ring resonant cavity, wherein an unstable mode-locked laser pulse spectrum can be observed in a spectrum analysis unit;
step 1.2, keeping the output power of the narrow linewidth tunable laser unchanged, and slowly reducing the central wavelength of the narrow linewidth tunable laser until the central wavelength is equal to the resonance wavelength of the nonlinear integrated micro-ring resonant cavity, so that a stable mode-locked laser pulse spectrum can be observed in the spectrum analysis unit;
further, the third step is specifically:
the middle infrared band mode-locked laser pulse is input into the nonlinear integrated waveguide after being subjected to mode field conversion by the mode field converter; the nonlinear integrated waveguide receives the intermediate infrared band mode-locked laser pulse after mode field conversion, and automatically generates parametric nonlinear processes such as cascade four-wave frequency mixing and self-phase modulation under the condition that free carriers are inhibited, so as to generate an intermediate infrared band broadband supercontinuum.
The invention has the advantages that:
1. the system integration level is high, and the volume is small;
the invention adopts a method of combining a high nonlinear integrated microcavity (nonlinear integrated micro-ring resonant cavity) and an integrated waveguide to generate a mid-infrared super-continuum spectrum, and the related core device integrated microcavity and the integrated waveguide are prepared from the same material, so that the integrated microcavity and the integrated waveguide are completely compatible and can be integrated into a chip, the system integration level is greatly improved, and the system volume is reduced; the method breaks through the limitations that the traditional method is large in size, complex in structure, difficult to be compatible with a mode locking and spectrum spreading material platform and the like;
2. the bandwidth of the intermediate infrared super-continuum spectrum is high;
the broadband intermediate infrared super-continuum spectrum realized by the invention adopts the mode-locked laser pulse generated by the micro-ring resonant cavity as the seed source and the high nonlinear integrated waveguide as the physical carrier generated by the super-continuum spectrum, has the advantages of large seed spectral bandwidth and flexible and controllable waveguide dispersion, and has the spectrum coverage in the range of 2500-5500nm in the intermediate infrared band, the bandwidth is more than or equal to 3000nm, and the bandwidth is improved by about one order of magnitude compared with that of the traditional method.
3. The generation efficiency of the intermediate infrared super-continuum spectrum is high;
the system has low threshold power which is less than or equal to 10mW, effectively improves the efficiency of generating the supercontinuum, avoids the requirements of other schemes on a high-power pumping light source and a power amplifier, and reduces the power consumption and the production cost of the system.
Compared with the traditional external optical fiber or solid mode-locked laser pumping scheme, the core device of the invention is a high nonlinear integrated microcavity and integrated waveguide, the ultrastrong optical field limiting capability and high nonlinear coefficient advantages of a micro-nano waveguide structure are fully exerted, mode-locked laser pulses and broadband supercontinuum can be generated under an extremely low power threshold, and a common low-power pumping light source can meet the requirements, so that high-power pumping or a power amplifier is not needed.
4. The operation process is simple and convenient;
the supercontinuum of the invention can be automatically generated after the mode-locking laser pulse is established, and the invention does not need any tuning process and has simple and convenient operation process.
5. The device has the advantages of simple structure, convenience, practicability, easy packaging, strong stability and environmental interference resistance and wide application value.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a time domain result graph of mode-locked laser pulses generated by a micro-ring resonator;
FIG. 3 is a graph of the result of a broadband supercontinuum spectrum produced by an integrated waveguide;
the reference numbers in the figures are: the device comprises a 1-narrow line width adjustable laser, a 2-tapered lens optical fiber, a 3-nonlinear integrated micro-ring resonant cavity, a 4-direct current stabilized power supply, a 5-mode field converter, a 6-nonlinear integrated waveguide, a 7-semiconductor refrigerator and an 8-spectrum analyzer.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
The embodiment provides a high-integration intermediate infrared broadband supercontinuum generation device, which comprises a pumping unit for providing narrow-linewidth continuous pumping laser, an integrated pulse generation unit for generating intermediate infrared waveband mode-locked laser pulses, a supercontinuum generation unit for generating intermediate infrared waveband broadband supercontinuum, a temperature control unit for controlling the temperature of the integrated pulse generation unit and the supercontinuum generation unit, and a spectrum analysis unit for analyzing and measuring the spectrum characteristics of the generated supercontinuum.
As shown in fig. 1, the pumping unit in this embodiment includes a narrow linewidth tunable laser 1 and a tapered lens fiber 2, and two ends of the tapered lens fiber 2 are respectively connected to an output end of the narrow linewidth tunable laser 1 and an input end of the integrated pulse generating unit. The integrated pulse generating unit comprises a nonlinear integrated micro-ring resonant cavity 3 and a direct-current stabilized power supply 4; the nonlinear integrated micro-ring resonant cavity 3 in the embodiment is a microcavity made of germanium material, while in other embodiments, microcavities made of other materials such as monocrystalline silicon and gallium arsenide can be adopted as long as the nonlinear integrated micro-ring resonant cavity has a high nonlinear optical coefficient; the nonlinear integrated micro-ring resonant cavity 3 is connected with a direct current stabilized power supply 4 through annular electrodes on the inner ring and the outer ring, the annular electrode on the inner ring is grounded (zero voltage), and the annular electrode on the outer ring is connected with the negative electrode of the direct current stabilized power supply 4. The supercontinuum generation unit comprises a mode field converter 5 and a nonlinear integrated waveguide 6; an input port of the mode field converter 5 is connected with a common end of the nonlinear integrated micro-ring resonant cavity 3, and an output port is connected with the nonlinear integrated waveguide 6; the nonlinear integrated waveguide 6 is made of the same material as the nonlinear integrated micro-ring resonant cavity 3. The nonlinear integrated micro-ring resonant cavity 3, the mode field converter 5 and the nonlinear integrated waveguide 6 are integrated on the same chip.
The temperature control unit is a semiconductor refrigerator 7 and is used for controlling the working temperature of the monolithic integrated nonlinear integrated micro-ring resonant cavity 3, the mode field converter 5 and the nonlinear integrated waveguide 6; other forms of temperature control devices may be used in other embodiments, as long as temperature regulation is achieved. The spectral analysis unit is a spectrum analyzer 8 for measuring the supercontinuum results produced by the analysis.
The mid-infrared supercontinuum can be generated by the following process:
1, adjusting the output power of a narrow linewidth adjustable laser 1, and slowly increasing the central wavelength of the narrow linewidth adjustable laser until the central wavelength is slightly larger than the resonance wavelength of a nonlinear integrated micro-ring resonant cavity 3, wherein an unstable mode-locked laser pulse spectrum can be observed in a spectrum analyzer 8;
keeping the output power of the narrow linewidth tunable laser 1 unchanged, and slowly reducing the central wavelength until the central wavelength is equal to the resonance wavelength of the nonlinear integrated micro-ring resonant cavity 3, so that a stable mode-locked laser pulse spectrum can be observed in the spectrum analyzer 8;
3, adjusting the output voltage (or current) of the direct current stabilized voltage supply 4 until free carriers in the nonlinear integrated micro-ring resonant cavity 3 are completely inhibited, generally from-15V to-5V, automatically generating nonlinear processes such as cascade four-wave frequency mixing, self-phase modulation and the like in the nonlinear integrated waveguide 6, and observing the generation of a mid-infrared super-continuum spectrum in the optical spectrum analyzer 8;
and 4, finely adjusting the working temperature of the semiconductor refrigerator 7, and observing the generated super-continuum spectrum waveform and bandwidth by using the optical spectrum analyzer 8 until the super-continuum spectrum with the maximum bandwidth is stably output.
The working principle of the invention is as follows:
firstly, performing mode field area compression on a narrow-linewidth adjustable laser 1 through a tapered lens optical fiber 2, and then injecting the compressed laser into a nonlinear integrated micro-ring resonant cavity 3 as pump laser coupling; the output power and the central wavelength of the pump laser are adjusted to enable the intensity and the frequency of the pump laser to meet the intensity threshold condition and the frequency resonance condition for obviously generating four-wave mixing in the nonlinear integrated micro-ring resonant cavity 3; the output voltage (or current) of the direct-current stabilized voltage supply 4 is regulated to apply reverse bias voltage to the nonlinear integrated micro-ring resonant cavity 3 and inhibit the free carrier effect, and mode-locked laser pulse generation can be realized through the intra-cavity four-wave mixing effect; mode field matching is carried out on the mode-locked laser pulse through a mode field converter 5, then the mode-locked laser pulse is injected into a nonlinear integrated waveguide 6, and a mid-infrared broadband supercontinuum is generated in nonlinear processes such as cascade four-wave mixing and self-phase modulation; by finely adjusting the working temperature of the semiconductor refrigerator 7 and measuring the spectrum result by the spectrum analyzer 8, stable intermediate infrared broadband supercontinuum output is obtained.
Referring to fig. 2, the time domain results of mode-locked laser pulses generated by the nonlinear integrated micro-ring resonator, and the results of broadband supercontinuum spectra generated by the nonlinear integrated waveguide of fig. 3. The method of combining the nonlinear integrated micro-ring resonant cavity and the nonlinear integrated waveguide can realize the generation of the mid-infrared super-continuum spectrum with high integration and high efficiency, the spectral range covers 2500 + 5500nm, and the bandwidth is more than or equal to 3000 nm.
The nonlinear integrated micro-ring resonant cavity and the integrated waveguide with super-strong optical field constraint capability are utilized, the power consumption and the power threshold value of a system can be obviously reduced, and the minimum threshold value is less than or equal to 10 mW; by controlling parameters such as output power and central wavelength of pump laser and inhibiting free carrier effect in a cavity by using reverse bias, mode-locked laser pulse and reliable generation of broadband supercontinuum can be realized, the limitations of large system size, complex structure, incompatibility of mode-locked and spectrum-expanding material platforms and the like in the traditional method are broken through, the mid-infrared supercontinuum with high bandwidth and low noise is obtained, and the bandwidth is increased by one order of magnitude compared with the traditional method; and the core device can be integrated with an integrated chip, so that the cost is reduced and the working stability is improved.
Claims (8)
1. A high-integration intermediate infrared broadband supercontinuum generation device is characterized in that: the system comprises a pumping unit, an integrated pulse generation unit, a supercontinuum generation unit, a temperature control unit and a spectrum analysis unit;
the pumping unit is used for providing narrow linewidth continuous pumping laser;
the integrated pulse generating unit comprises a nonlinear integrated micro-ring resonant cavity (3) and a direct-current stabilized power supply (4); the nonlinear integrated micro-ring resonant cavity (3) is connected with a direct-current stabilized power supply (4) through ring electrodes on the inner ring and the outer ring, the ring electrode on the inner ring is grounded, and the ring electrode on the outer ring is connected with the negative electrode of the direct-current stabilized power supply (4); the direct-current stabilized power supply (4) is used for providing reverse bias voltage for the nonlinear integrated micro-ring resonant cavity and inhibiting the free carrier effect in the nonlinear integrated micro-ring resonant cavity; the nonlinear integrated micro-ring resonant cavity (3) is used for receiving pump laser and generating mid-infrared band mode-locked laser pulses in the process of four-wave mixing;
the material of the super-continuum spectrum generation unit is the same as that of the nonlinear integrated micro-ring resonant cavity (3), and the nonlinear integrated micro-ring resonant cavity (3) is integrated on the same chip and is used for receiving the middle infrared band mode-locked laser pulse and generating a nonlinear process to generate a middle infrared band broadband super-continuum spectrum;
the temperature control unit is used for controlling the temperature of the nonlinear integrated micro-ring resonant cavity (3) and the supercontinuum generation unit;
the spectrum analysis unit is used for analyzing and measuring the generated mid-infrared super-continuum spectrum.
2. The highly integrated mid-infrared broadband supercontinuum generating device according to claim 1, characterized in that: the supercontinuum generation unit comprises a mode field converter (5) and a nonlinear integrated waveguide (6);
the input port of the mode field converter (5) is connected with the common end of the nonlinear integrated micro-ring resonant cavity (3), and the output port is connected with the nonlinear integrated waveguide (6) and is used for matching the mode field area of the nonlinear integrated micro-ring resonant cavity (3) and the nonlinear integrated waveguide (6) to realize the coupling of the nonlinear integrated micro-ring resonant cavity (3) and the nonlinear integrated waveguide (6);
the nonlinear integrated waveguide (6) is used for receiving the mode-locked laser pulse of the intermediate infrared band, generating a nonlinear process and generating an intermediate infrared band broadband supercontinuum.
3. The highly integrated mid-infrared broadband supercontinuum generation device according to claim 2, characterized in that: the pumping unit comprises a narrow linewidth adjustable laser (1) and a tapered lens optical fiber (2);
the narrow linewidth adjustable laser (1) is used for emitting continuous pumping laser; and two ends of the tapered lens optical fiber (2) are respectively connected with the output end of the narrow-linewidth adjustable laser (1) and the input end of the nonlinear integrated micro-ring resonant cavity (3) and are used for coupling the continuous pumping laser to the nonlinear integrated micro-ring resonant cavity (3).
4. The highly integrated mid-infrared broadband supercontinuum generation apparatus according to claim 3, characterized in that: the temperature control unit is a semiconductor refrigerator (7) and is used for controlling the working temperatures of the nonlinear integrated micro-ring resonant cavity (3), the mode field converter (5) and the nonlinear integrated waveguide (6).
5. The highly integrated mid-infrared broadband supercontinuum generating apparatus according to any one of claims 1 to 4, characterized in that: the spectral analysis unit is a spectrum analyzer (8).
6. The method for generating the broadband supercontinuum based on the highly-integrated mid-infrared broadband supercontinuum generating device as claimed in claim 1, characterized by comprising the following steps:
adjusting the average power and the central wavelength of narrow-linewidth continuous pumping laser emitted by a pumping unit to enable the intensity and the frequency of the pumping laser to meet the intensity threshold condition and the frequency resonance condition of a four-wave mixing process in a nonlinear integrated micro-ring resonant cavity (3);
adjusting the output voltage or current of the direct-current stabilized power supply until free carriers in the nonlinear integrated micro-ring resonant cavity (3) are completely inhibited, and generating intermediate infrared band mode-locked laser pulses in the four-wave mixing process;
thirdly, a super-continuum spectrum generation unit receives the intermediate infrared band mode-locked laser pulse, and generates a nonlinear process to generate an intermediate infrared broadband super-continuum spectrum;
and fourthly, observing the generated super-continuum spectrum waveform and bandwidth by using the spectrum analysis unit, and adjusting the working temperature of the temperature control unit to realize stable super-continuum spectrum output.
7. The method for generating a broadband supercontinuum according to claim 6, characterized in that step one is embodied as:
step 1.1, adjusting the output power of a narrow linewidth adjustable laser (1), slowly increasing the central wavelength of the narrow linewidth adjustable laser until the central wavelength is slightly larger than the resonance wavelength of a nonlinear integrated micro-ring resonant cavity (3), and observing an unstable mode-locked laser pulse spectrum in a spectrum analyzer (8);
step 1.2, keeping the output power of the narrow linewidth tunable laser (1) unchanged, slowly reducing the central wavelength of the narrow linewidth tunable laser until the central wavelength is equal to the resonance wavelength of the nonlinear integrated micro-ring resonant cavity (3), and observing a stable mode-locked laser pulse spectrum in a spectrum analyzer (8).
8. The method for generating a broadband supercontinuum according to claim 7, wherein step three is specifically:
the middle infrared band mode-locked laser pulse is input into a nonlinear integrated waveguide (6) after being subjected to mode field conversion by a mode field converter (5); and the nonlinear integrated waveguide (6) receives the mode-locked laser pulse of the intermediate infrared band after mode field conversion, and automatically generates a nonlinear process under the condition that free carriers are inhibited to generate an intermediate infrared band broadband supercontinuum.
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| CN113540940A (en) * | 2021-04-30 | 2021-10-22 | 中国科学院西安光学精密机械研究所 | Integrated perfect soliton crystal frequency comb source with tunable repetition frequency and generation method |
| CN114153032A (en) * | 2021-12-22 | 2022-03-08 | 哈尔滨工业大学（深圳） | Three-dimensional asymmetric microcavity device for optical field regulation and control and integrated device thereof |
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| CN114153032B (en) * | 2021-12-22 | 2023-08-15 | 哈尔滨工业大学（深圳） | Three-dimensional asymmetric microcavity device for light field regulation and integration device thereof |
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