A spectrum shaping and dispersion regulation synergic integration device

Abstract

The application discloses a spectrum shaping and dispersion control synergic integrated device. The device comprises a wide-spectrum pulse laser light source to be measured, a light splitting module, a dispersion control module, a spectrum analysis component, a spectrum shaping module and a data processing component. After the laser pulse enters the light splitting module, light beam L1 and light beam L2 are obtained, the light beam L1 enters the spectrum analysis component to obtain an initial spectrum; the light beam L2 is expanded in space when passing through the dispersion control module, the data processing component obtains a modulation function, and the spectrum shaping module realizes the spectrum shaping effect by modulating the pulse laser. The pulse laser after spectrum shaping returns to the dispersion control module, restores the original state and realizes the function of dispersion control on the pulse laser. The application integrates the two key functions of dispersion control and spectrum shaping in the same optical path device, and realizes the synchronous fine control on the wide-spectrum pulse through the closed-loop design of 'light splitting-analysis-shaping-feedback control'.

Description

Technical Field

[0001] This invention relates to the fields of spatial light modulation and laser dispersion control technology, and particularly to a synergistic integrated device for spectral shaping and dispersion control. Background Technology

[0002] Ultrafast lasers, with their extremely high peak power and extremely short interaction time, play an irreplaceable role in fields such as biomedical imaging (e.g., multiphoton fluorescence microscopy), precision micromachining, and ultrafast spectroscopy. In these applications, the pulse width, spectral shape, and other properties of the laser pulse directly or indirectly determine the final application effect. Therefore, obtaining and controlling a flat (or specific-shaped) spectrum has significant advantages in practical laser applications.

[0003] In the time domain, a broad spectrum typically corresponds to a shorter transform-limited pulse width and a cleaner pulse time profile, which is crucial for imaging requiring high temporal resolution (such as fluorescence lifetime imaging). Furthermore, a specific spectral shape can optimize interaction with the sample; spectral shaping can more effectively excite specific fluorophores. However, the raw pulses generated by conventional lasers often have complex or suboptimal spectra, and pulsed lasers introduce dispersion during propagation, leading to pulse broadening. Therefore, obtaining a narrow-pulse laser with a specific spectral shape usually requires two independent sub-devices: a dispersion control device, using prism pairs, grating pairs, or fiber pulse compressors to compensate for dispersion and compress the pulse width; and a spectral shaping device, typically based on liquid crystal spatial light modulators or acousto-optic programmable filters, to shape the spectrum into the target shape. While this discrete approach is powerful, it results in system complexity, high cost, difficulties in optical path tuning, limited application scenarios, and introduces additional insertion loss and space occupation, hindering the integration and practical application of the device. Summary of the Invention

[0004] In order to at least solve one of the problems of the existing technology, the present invention provides a synergistic integrated device for spectral shaping and dispersion control. The device can integrate the two key functions of dispersion control and spectral shaping into the same optical path device, and can realize spectral shaping while realizing dispersion control.

[0005] This invention integrates two key functions, dispersion control and spectral shaping, into a single physical optical path. Through a closed-loop design of "spectral dispersion-analysis-shaping-feedback control," it achieves synchronous and precise control of a wide-spectrum pulse. By introducing a spectral shaping module and corresponding spectral analysis and data processing components into the standard dispersion control optical path, it significantly reduces hardware costs and system maintenance complexity. This provides a compact and precise ideal light source solution for various applications such as bioimaging and precision manufacturing, demonstrating significant practical value and market potential.

[0006] The proposed spectral shaping and dispersion control integrated device provides a solution to the above problems. Based on a dispersion control device, it can achieve fine dispersion control and spectral shaping of a broadband pulsed laser light source. It can provide more suitable pulse width and spectral parameters for various application scenarios such as bioimaging and precision machining based on a single laser. Compared with the existing technology, it has the advantages of system integration and low cost.

[0007] The objective of this invention is achieved by at least one of the following technical solutions.

[0008] A synergistic integrated device for spectral shaping and dispersion modulation includes a broadband pulsed laser light source, a spectroscopic module, a dispersion modulation module, a spectral analysis component, a spectral shaping module, and a data processing component; The laser pulses generated by the broadband pulsed laser light source under test enter the beam splitting module and are split into beams L1 and L2. Beam L1 serves as the signal light and enters the spectral analysis component to obtain the initial spectrum, which is then sent to the data processing component. When beam L2 first passes through the dispersion control module, the angular dispersion provided by the dispersion component enables the spectrum to expand in space. After analyzing the initial and target spectra, the data processing component obtains laser pulses with modulation functions different from the spatial spectral distribution and injects them into the spectral shaping module. Modulating the pulsed laser at different spatial positions achieves the effect of spectral shaping. The spectrally shaped pulsed laser returns to the dispersion control module, where the same dispersion component restores the beam to its original shape in space. This simultaneously achieves the function of dispersion control of the pulsed laser, resulting in pulse compression and ultimately obtaining a pulsed laser with the pulse width and spectrum meeting the target requirements.

[0009] Furthermore, the broadband pulsed laser light source under test is used to generate broadband laser pulses with a repetition rate of megahertz (MHz) or higher.

[0010] Furthermore, the beam splitting module is used to split the beam, which can proportionally divide the pulsed laser into two beams L1 and L2 with consistent spectral information.

[0011] Furthermore, the dispersion control module is used to control laser dispersion, while simultaneously expanding and restoring the spectrum in space to achieve the effect of pulse compression. Furthermore, the spectral analysis component is used to analyze spectral information, and can read the input spectral information in real time and convert it into spectral data that can be processed by the data processing component; Furthermore, the spectral shaping module is used to control the spectral shape, and can customize the spectral shape of the pulsed laser according to the subsequent application of the light source to meet various application requirements; Furthermore, the data processing unit is used to process spectral data, input the modulation function into the spectral shaping module according to the target parameters, and realize real-time feedback adjustment of the modulation function; This invention enables simultaneous control of the pulse width and spectral shape of a broadband laser source, allowing a single laser source to meet specific requirements for application in different experiments.

[0012] Furthermore, the broadband pulsed laser light source under test is an all-fiber pulsed laser that can emit broadband laser light sources with a repetition rate of megahertz (MHz) or higher.

[0013] Furthermore, the beam splitting module is a beam splitter that can split the pulsed laser into two beams, L1 and L2, with consistent spectral information.

[0014] Furthermore, the dispersion control module includes a dispersion component and a hollow reflector. The beam L2 first passes through the dispersion component to spatially expand the spectrum. Subsequently, the beam L3 returned by the spectral shaping module passes through the dispersion component again to complete the spatial restoration of the beam and simultaneously achieve the effect of adjusting the dispersion compression pulse width, such as... Figure 3 As shown, the final pulsed laser is output through the hollow reflector.

[0015] Furthermore, the spectral analysis component is a spectrometer, which can read the input spectral information in real time and convert it into spectral data that can be processed by the data processing component; Furthermore, the spectral shaping module includes a spatial light modulator and a beam splitter; the spatial light modulator can achieve spectral shaping by spatially modulating the light beam using an input modulation function, such as... Figure 2 As shown, the shaped spectrum is passed through the spectrometer to obtain the target beam L3 and the monitoring beam L4. The monitoring beam L4 enters the spectral analysis component to obtain the shaped spectral data, and the target beam L3 is returned to the dispersion control module.

[0016] Furthermore, the data processing component includes a programmable terminal, which demodulates the raw spectral data read by the spectral analysis component with the target spectrum to obtain a modulation function, and inputs it to the spectral shaping module. The shaped spectral data is fed back to the data processing component through the spectral analysis component. The programmable terminal compares and analyzes the shaped spectrum with the target spectrum and adjusts the modulation function in real time.

[0017] Compared with existing technologies, the beneficial effects of the present invention are as follows: 1. This invention introduces a spectral shaping module and a corresponding monitoring and control unit into a standard dispersion modulation optical path, which significantly reduces hardware costs and system maintenance complexity, and provides a compact and precise ideal light source solution for various application scenarios such as biological imaging and precision processing. It has important practical value and market prospects. 2. This invention can simultaneously achieve dispersion control of spectral shaping, integrating the two key functions of dispersion control and spectral shaping into the same physical optical path. At the same time, through the closed-loop design of "spectral dispersion-analysis-shaping-feedback control", it achieves synchronous and precise control of broadband pulses. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a spectral shaping and dispersion modulation integrated device provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram illustrating the effect of spectral shaping in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram illustrating the effect of pulse compression in an embodiment of the present invention.

[0021] In the figure, the broadband pulsed laser light source under test is 101, the beam splitting module is 102, the dispersion control module is 103, the spectral analysis component is 104, the spectral shaping module is 105, and the data processing component is 106. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the phrase "in one embodiment of the invention" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. The phrase "in one embodiment of the invention" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either alone or selectively.

[0025] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0026] Please see Figure 1 The present invention provides a spectral shaping and dispersion control integrated device, which includes a broadband pulsed laser light source 101, a spectroscopic module 102, a dispersion control module 103, a spectral analysis component 104, a spectral shaping module 105, and a data processing component 106.

[0027] The laser pulses generated by the broadband pulsed laser light source 101 are split by the beam splitting module 102 to obtain beams L1 and L2. Beam L1, as a signal light, enters the spectral analysis component 104, and the initial spectrum obtained by the spectral analysis component 104 is then sent to the data processing component 106. When beam L2 first passes through the dispersion control module 103, the angular dispersion provided by the dispersion component enables spatial expansion of the spectrum. After analyzing the initial and target spectra, the data processing component 106 obtains a modulation function for spectral shaping. The modulation function and laser pulses with different spatial spectral distributions are simultaneously injected into the spectral shaping module 105. In the spectral shaping module 105, the modulation function modulates the pulsed lasers at different spatial positions to achieve spectral shaping. In one embodiment of the invention, the spectra before and after modulation are as follows: Figure 2 As shown. After spectral shaping, the pulsed laser returns to the dispersion control module 103 via the same dispersion component, allowing the beam to spatially restore its original shape. This simultaneously achieves dispersion control of the pulsed laser, resulting in pulse compression and ultimately obtaining a pulsed laser with the desired pulse width and spectrum. In one embodiment of the invention, the intensity distribution before and after pulse compression is as follows: Figure 3 Show.

[0028] In one embodiment of the present invention, the broadband pulsed laser light source 101 is a broadband laser light source capable of emitting a repetition rate of megahertz or higher.

[0029] In one embodiment of the present invention, the broadband pulsed laser light source under test 101 is a fully polarization-maintaining fiber pulsed laser with a center wavelength of 1100nm and a spectral width of >100nm, and the output laser pulse repetition rate is 40MHz.

[0030] In one embodiment of the present invention, the beam splitting module 102 is capable of splitting the pulsed laser into two beams L1 and L2 with consistent spectral information.

[0031] In one embodiment of the present invention, the beam splitting module 102 is a beam splitter, including a half-wave plate and a polarizing beam splitter prism. The beam L first passes through the half-wave plate and reaches the polarizing beam splitter prism. By rotating the direction of the half-wave plate, the beam splitting ratio of beam L1 and beam L2 in the polarizing beam splitter prism can be controlled. The spectral information of the beam L1 and the beam L2 are kept consistent. The beam L1 is sent as the initial spectral signal light into the spectral analysis component 104, and the beam L2 enters the dispersion control module 103.

[0032] In one embodiment of the present invention, the dispersion control module 103 includes a dispersion component and a hollow reflector. The light beam L2 first passes through the dispersion component, which is a pair of prisms. The light beam L2 passes through the pair of prisms once to expand the spectrum in space. The pulsed laser carrying spatial spectral information is sent to the spectral shaping module 105 for spectral modulation. The returning light beam L3 passes through the pair of prisms in the dispersion control module 103 again to restore the light beam in space and simultaneously achieve the effect of adjusting the dispersion and compressing the pulse width. Finally, the pulsed laser of the target is output through the hollow reflector.

[0033] In one embodiment of the present invention, the spectral analysis component 104 is a spectrometer, which can read the input spectral information in real time and convert it into spectral data that can be processed by the data processing component 106.

[0034] In one embodiment of the present invention, the spectral shaping module 105 includes a spatial light modulator and a beam splitter. The spatial light modulator is an intensity-dependent spatial light modulator, and the beam splitter is a quartz window. The intensity-dependent spatial light modulator can spatially modulate the intensity of the light beam through an input modulation function to achieve the effect of spectral shaping. The shaped spectrum is split through the quartz window to obtain a target beam L3 and a monitoring beam L4. The monitoring beam L4 enters the spectral analysis component 104 to obtain the shaped spectral data, and the target beam L3 returns to the dispersion control module 103 for pulse spatial reset and pulse compression.

[0035] In one embodiment of the present invention, the data processing unit 106 includes a programmable terminal. The programmable terminal inputs the raw spectral data read by the spectral analysis unit 104 and the modulation function obtained by demodulating the target spectrum into the spectral shaping module 105. The shaped spectral data is fed back to the data processing unit 106 through the spectral analysis unit 104. The programmable terminal compares and analyzes the shaped spectrum with the target spectrum and adjusts the modulation function in real time.

[0036] The spectral shaping and dispersion control integrated device provided in this invention integrates the two key functions of dispersion control and spectral shaping into the same optical path device, and achieves synchronous and precise control of broadband pulses through a closed-loop design of "spectral dispersion-analysis-shaping-feedback control".

[0037] The above embodiments are one of the implementation methods of the present invention, but the implementation methods of the present invention are not limited to the embodiments and test examples. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A synergistic integrated device for spectral shaping and dispersion modulation, characterized in that, It includes a broadband pulsed laser light source under test (101), a spectroscopic module (102), a dispersion control module (103), a spectral analysis component (104), a spectral shaping module (105), and a data processing component (106). The laser pulse generated by the broadband pulsed laser light source under test (101) enters the beam splitting module (102) and is split to obtain beam L1 and beam L2 respectively. Beam L1 enters the spectral analysis component (104) and after obtaining the initial spectrum, it is sent to the data processing component (106). When beam L2 passes through the dispersion control module (103) for the first time, the spectrum is expanded in space. The data processing component (106) obtains the modulation function based on the initial spectrum and the target spectrum. Laser pulses with different spectral distributions in space are simultaneously injected into the spectral shaping module (105) and the pulsed laser at different positions in space is modulated by the modulation function to achieve the effect of spectral shaping. After spectral shaping, the pulsed laser returns to the dispersion control module (103) to restore the original shape of the beam in space and realize the function of dispersive control of the pulsed laser. Finally, a pulsed laser with pulse width and spectrum that meet the target requirements is obtained.

2. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 1, characterized in that: The broadband pulsed laser light source under test (101) is an all-fiber pulsed laser capable of emitting broadband laser light sources with a repetition rate of megahertz or higher.

3. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 1, characterized in that: The beam splitting module (102) is a beam splitter that can split the pulsed laser into two beams L1 and L2 with consistent spectral information.

4. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 3, characterized in that: The beam splitter includes a half-wave plate and a polarizing beam splitter prism. The beam splitting ratio of beams L1 and L2 in the polarizing beam splitter prism is controlled by rotating the direction of the half-wave plate.

5. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 1, characterized in that: The dispersion control module (103) includes a dispersion component and a hollow reflector. The beam L2 first passes through the dispersion component to expand the spectrum in space. The target beam L3 returned by the spectrum shaping module (105) then passes through the dispersion component again to restore the beam in space and achieve the effect of adjusting the dispersion compression pulse width. Finally, the final pulsed laser is output through the hollow reflector.

6. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 5, characterized in that: When beam L2 passes through the dispersion control module (103) for the first time, the angular dispersion provided by the dispersion component can realize the spatial expansion of the spectrum.

7. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 5, characterized in that: The dispersive component is a pair of prisms.

8. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 1, characterized in that: The spectral analysis component (104) is a spectrometer, which can read the input spectral information in real time and convert it into spectral data that can be processed by the data processing component.

9. The synergistic integrated device for spectral shaping and dispersion modulation according to claim 1, characterized in that: The spectral shaping module (105) includes a spatial light modulator and a beam splitter. The spatial light modulator modulates the beam in space through the input modulation function to achieve the effect of spectral shaping. The shaped spectrum is obtained by the beam splitter to obtain the target beam L3 and the monitoring beam L4. The monitoring beam L4 enters the spectral analysis component (104) to obtain the shaped spectral data. The target beam L3 is returned to the dispersion control module (103).

10. A synergistic integrated device for spectral shaping and dispersion modulation according to any one of claims 1-9, characterized in that: The data processing unit (106) includes a programmable terminal, which demodulates the raw spectral data read by the spectral analysis unit (104) with the target spectrum to obtain a modulation function, and inputs it to the spectral shaping module (105). The shaped spectral data is fed back to the data processing unit (106) through the spectral analysis unit (104). The programmable terminal compares and analyzes the shaped spectrum with the target spectrum and adjusts the modulation function in real time.

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