Beam splitting synchronization assembly for single-emission autocorrelator and single-emission autocorrelator

Abstract

The invention discloses a beam splitting synchronization assembly for a single-emission autocorrelator and the single-emission autocorrelator, and relates to the technical field of laser pulse measurement. The beam splitting synchronization assembly comprises a dihedral corner reflector. The dihedral corner reflector comprises a first reflecting surface and a second reflecting surface which intersect with each other. The surface of the first reflecting surface and the surface of the second reflecting surface are provided with coating films based on metal materials. Laser to be measured enters the ridge line of the dihedral corner reflector, passes through the first reflecting surface and then is emitted as first beam splitting laser, and passes through the second reflecting surface and then is emitted as second beam splitting laser; the angular bisector of the included angle between the propagation direction of the first split laser and the propagation direction of the second split laser is perpendicular to the incident optical axis of the laser to be measured. The beam splitting synchronization assembly does not need an additional time synchronization mechanism such as a delay line, and the characteristic of almost zero dispersion of the to-be-measured laser in a bandwidth range can be ensured by arranging a coating film based on a metal material, so that introduction of additional material dispersion and angular dispersion during beam splitting and synchronization of the to-be-measured laser is avoided.

Description

Technical Field

[0001] This application relates to the field of laser pulse measurement technology, and more specifically, to a beam splitting synchronization component for a single-shot autocorrelator and a single-shot autocorrelator. Background Technology

[0002] Femtosecond laser pulses possess ultra-short pulse widths and ultra-high peak power. Accurate pulse width measurement is crucial when using femtosecond laser pulses, and single-shot autocorrelators are classic pulse width measurement devices, widely favored for their fast measurement speed, lack of reference light requirement, and simple structure.

[0003] Existing femtosecond laser pulse single-shot autocorrelators typically employ planar beam splitters or prisms to split the laser beam. During this splitting process, the beam penetrates the optical glass material, introducing new dispersive components into the laser under test. This alters the pulse width of the laser as it interacts with the nonlinear crystal, affecting the measurement results. For example, when using a beam splitter or planar beam splitter, the transmitted portion penetrates the glass substrate, introducing additional dispersion, and the two beams exhibit different dispersions and pulse widths. Similarly, when using various prisms to split the laser pulse, both beams penetrate the wedge-shaped glass material, introducing additional material and angular dispersion. When measuring extremely short pulse widths, especially those of several-cycle or near-single-cycle lasers that are highly sensitive to dispersion, the additional dispersion introduced by these methods has a particularly severe impact on the measurement results, significantly affecting their accuracy.

[0004] The content of the background section is merely technology known to the public and does not necessarily represent existing technology in the field. Summary of the Invention

[0005] This application aims to provide a beam splitting synchronization component and a single-shot autocorrelator for use in a single-shot autocorrelator, in order to overcome the shortcomings of existing femtosecond laser pulse single-shot autocorrelators that introduce additional dispersion and affect measurement accuracy.

[0006] According to one aspect of this application, a beam-splitting synchronization component for a single-shot autocorrelator is provided. The beam-splitting synchronization component includes a dihedral mirror. The dihedral mirror includes an intersecting first reflecting surface and a second reflecting surface. Both the surfaces of the first and second reflecting surfaces are coated with a metal-based material. The laser to be tested is incident on the ridge of the dihedral mirror, and after passing through the first reflecting surface, it exits as a first beam-splitting laser, and after passing through the second reflecting surface, it exits as a second beam-splitting laser. The angle bisector of the angle between the propagation directions of the first and second beam-splitting lasers is perpendicular to the incident optical axis of the laser to be tested.

[0007] According to some embodiments of this application, when the ridge of the dihedral reflector is vertically set, the incident optical axis of the laser to be tested is perpendicular to the ridge, and the first and second split laser beams propagate in the horizontal plane.

[0008] According to some embodiments of this application, when the ridge line of the dihedral reflector is set horizontally, the optical axis of the laser to be tested is located at the angle bisector of the first and second reflecting surfaces, and the first and second split laser beams propagate in the vertical plane.

[0009] According to some embodiments of this application, the metal material used for the coating based on the metal material is one of gold, silver, aluminum, or copper.

[0010] According to one aspect of this application, a single-shot autocorrelation meter is provided, including the beam-splitting synchronization component as described above. The single-shot autocorrelation meter further includes an autocorrelation signal generation component and a signal transmission detection component. The autocorrelation signal generation component is disposed in the region where the first and second beam-splitting lasers generate autocorrelation signals, and is used to generate autocorrelation signals. The signal transmission detection component is disposed in a preset propagation path of the autocorrelation signals, and is used to receive the autocorrelation signals, image the autocorrelation signals onto a target imaging plane, and output a two-dimensional image corresponding to the autocorrelation signals on the target imaging plane, so as to determine the pulse width of the laser under test based on the two-dimensional image.

[0011] According to some embodiments of this application, the autocorrelation signal generation component includes a nonlinear crystal and a filter. The nonlinear crystal is disposed in the region where the first and second beam-splitting lasers generate autocorrelation signals, and is used to generate autocorrelation signals; the filter is used to filter the autocorrelation signals.

[0012] According to some embodiments of this application, the signal transmission detection assembly includes an achromatic lens, a pinhole filter, a polarizer, and an area array detector. The achromatic lens is used to image the autocorrelation signal onto the target imaging plane at a preset imaging magnification; the pinhole filter is disposed after the achromatic lens to filter out residual scattered fundamental frequency light of the autocorrelation signal; the polarizer is rotatably disposed along a preset propagation path of the autocorrelation signal, and is disposed after the pinhole filter to adjust the intensity of the autocorrelation signal; the area array detector is disposed on the target imaging plane after the polarizer, parallel to the polarizer, and outputs the autocorrelation signal output by the polarizer as a two-dimensional image.

[0013] According to some embodiments of this application, the single-shot autocorrelator also includes an optical path collimation component.

[0014] The optical path collimation assembly includes a first aperture, a beam-splitting guide mirror, and a second aperture. The first aperture is positioned in the incident path of the laser under test and is used to align the incident position of the laser under test. The beam-splitting guide mirror is positioned in the propagation path of the first split laser beam and is used to receive the first split laser beam and adjust its propagation direction. The second aperture is positioned in the adjusted propagation path of the first split laser beam and is used to align its propagation position.

[0015] According to some embodiments of this application, the single-shot autocorrelator also includes a baffle. The baffle is disposed in the propagation path of the second split laser beam.

[0016] According to some embodiments of this application, the single-shot autocorrelation meter also includes a housing. The housing is disposed around the exterior of the beam splitting synchronization component, the autocorrelation signal generation component, and the signal transmission detection component.

[0017] The technical solution of this application divides the laser under test into two equal beams (i.e., a first beam and a second beam) in space on both sides of a ridge, and they continue to propagate in two directions at a certain angle. Because it is spatial beam splitting and the spot of the laser under test intersects the ridge, the two beams (i.e., the first beam and the second beam) have natural time synchronization characteristics, eliminating the need for additional time synchronization mechanisms such as delay lines. Furthermore, by applying a metal-based coating to the surfaces of the first and second reflecting surfaces, this technical solution ensures that the laser under test has almost zero dispersion within its bandwidth, thus avoiding the introduction of additional material dispersion and chromatic dispersion during the synchronization and beam splitting of the laser under test. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A top view showing the structure of the beam splitting synchronization component according to this application; Figure 2 A front view of the beam splitting synchronization component structure according to this application is shown; Figure 3 A top view of a single-electro-autocorrelator structure with a vertically oriented ridge line for a dihedral mirror according to this application is shown. Figure 4 Show Figure 3 Schematic diagram of various angles when the ridge line of the dihedral reflector is set vertically; Figure 5 A front view of a single-electro-autocorrelator structure with a vertically oriented ridge line for a dihedral mirror according to this application is shown. Figure 6 A top view of a single-shot autocorrelator structure with a horizontally oriented ridge line for a dihedral mirror according to this application is shown. Figure 7 Show Figure 6 Schematic diagram of various angles when the ridge line of the dihedral reflector is set horizontally; Figure 8A front view of a single-shot autocorrelator structure with a horizontally set ridge line for a dihedral mirror according to this application is shown. Figure 9 Show Figure 8 Schematic diagram of various angles when the ridge line of the dihedral reflector is set horizontally; Figure 10 This diagram shows a test result of the autocorrelation signal and the laser pulse width signal under test.

[0020] Explanation of reference numerals in the attached figures: 1. Beam splitting synchronization component; 11. Dihedral mirror; 111. First reflecting surface; 112. Second reflecting surface; 113. Coating based on metallic material; 12. Laser under test; 13. First beam laser; 14. Second beam laser; 15. Autocorrelation signal; 100. Single-shot autocorrelation instrument; 2. Autocorrelation signal generation component; 3. Signal transmission and detection component; 4. Optical path collimation component; 5. Baffle plate; 21. Nonlinear crystals; 31. Achromatic lens; 32. Pinhole filter; 33. Polarizer; 34. Area array detector; 41. First aperture; 42. Beam splitter rear light guide; 43. Second aperture. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0022] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0023] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0024] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order.

[0025] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] According to one aspect of this application, a beam-splitting synchronization component for a single-shot autocorrelator is provided. See also... Figure 1 and Figure 2 The beam splitting synchronization assembly 1 includes a dihedral mirror 11. The dihedral mirror 11 includes an intersecting first reflecting surface 111 and a second reflecting surface 112. The line of intersection of the first reflecting surface 111 and the second reflecting surface 112 is the ridge line of the dihedral mirror 11.

[0027] According to an example embodiment, both the surfaces of the first reflecting surface 111 and the second reflecting surface 112 are provided with a metal-based coating 113. For example, the surface of the first reflecting surface 111 is provided with the metal-based coating 113 on the surface of the laser under test 12. The surface of the second reflecting surface 112 is provided with the metal-based coating 113 on the surface of the laser under test 12. The metal-based coating 113 can be a metal film layer with almost zero dispersion characteristics within the bandwidth range of the laser under test 12.

[0028] Optionally, the metal material of the coating 113 based on the metal material can be one of gold, silver, aluminum or copper.

[0029] The laser to be tested 12 is incident on the ridge of the dihedral reflector 11, and after passing through the first reflecting surface 111, it exits as the first split laser beam 13, and after passing through the second reflecting surface 112, it exits as the second split laser beam 14. The laser to be tested 12 can be a femtosecond laser.

[0030] The laser to be tested 12 is incident on the ridge of the dihedral reflector 11 at a preset angle, such that the bisector of the angle between the propagation direction of the first split laser 13 and the propagation direction of the second split laser 14 is perpendicular to the incident optical axis of the laser to be tested 12. The preset angle can be the angle between the incident optical axis and the bisectors of the angle between the first reflecting surface 111 and the second reflecting surface 112, or the preset angle can be the angle between the incident optical axis and the ridge.

[0031] The laser under test 12 is spatially divided into two equal beams (i.e., the first beam 13 and the second beam 14) on both sides of the ridge line, and continues to propagate in two directions at a certain angle. Since it is spatially split and the spot of the laser under test 12 intersects the ridge line, the two laser beams (i.e., the first beam 13 and the second beam 14) have natural time synchronization characteristics, eliminating the need for additional time synchronization mechanisms such as delay lines.

[0032] Through the above embodiments, the technical solution of this application divides the laser under test into two equal beams (i.e., the first beam and the second beam) in space on both sides of the ridge, and they continue to propagate in two directions at a certain angle. Since it is spatial beam splitting and the spot of the laser under test intersects the ridge, the two beams generated by the splitting (i.e., the first beam and the second beam) have natural time synchronization characteristics, eliminating the need for additional time synchronization mechanisms such as delay lines. The technical solution of this application, by setting a metal-based coating on the surfaces of the first and second reflective surfaces, can ensure that the laser under test has almost zero dispersion characteristics within the bandwidth range, thereby avoiding the introduction of additional material dispersion and chromatic dispersion during the synchronization and beam splitting of the laser under test.

[0033] Optionally, when the ridge of the dihedral reflector 11 is vertically set, the incident optical axis of the laser to be tested 12 is perpendicular to the ridge, and the first split laser 13 and the second split laser 14 propagate in the horizontal plane.

[0034] For example, see Figure 3 and Figure 4 The ridge of the dihedral reflector 11 is set vertically, and the incident optical axis of the laser to be tested 12 is perpendicular to the ridge. The preset angle is the angle between the incident optical axis and the angle bisectors between the first reflecting surface 111 and the second reflecting surface 112. The first and second split laser beams 13 and 14 propagate in a horizontal plane. The incident optical axis of the laser under test 12 is in the same plane as both the first and second split laser beams 13 and 14. The angle bisector of the angle between the propagation directions of the first and second split laser beams 13 and 14 is perpendicular to the incident optical axis of the laser under test 12. This configuration is suitable for lasers under test 12 that are P-polarized lasers.

[0035] Optionally, when the ridge of the dihedral reflector 11 is set horizontally, the optical axis of the laser to be tested 12 is located at the angle bisector of the first reflecting surface 111 and the second reflecting surface 112, and the first split laser beam 13 and the second split laser beam 14 propagate in the vertical plane.

[0036] For example, see Figures 6 to 9 The ridge of the dihedral reflector 11 is set horizontally, and the optical axis of the laser to be tested 12 is located at the angle bisector of the first reflecting surface 111 and the second reflecting surface 112, with a preset angle (the angle between the incident optical axis and the ridge). Where α is the angle between the first reflecting surface 111 and the second reflecting surface 112 (e.g., Figure 1 (As shown). The first and second split laser beams 13 and 14 propagate in a vertical plane after being split. The plane formed by the propagation directions of the first and second split laser beams 13 and 14 is perpendicular to the optical axis of the incident laser 12. This configuration is suitable for lasers 12 that are S-polarized.

[0037] According to one aspect of this application, this application provides a single-shot autocorrelation meter, see [link to relevant documentation]. Figure 3 The single-shot autocorrelation instrument 100 includes the beam splitting synchronization component 1, the autocorrelation signal generation component 2, and the signal transmission detection component 3 as described above.

[0038] According to an example embodiment, the autocorrelation signal generating component 2 is disposed within the propagation length of the autocorrelation signal 15 generated by the first split laser 13 and the second split laser 14. The autocorrelation signal generating component 2 is used to generate the autocorrelation signal 15. The first split laser 13 and the second split laser 14, after being split, are within a certain propagation length L (e.g., ...). Figure 4 and Figure 9 As shown, there is an overlapping region within the propagation length L, which can be used to generate the autocorrelation signal 15. The autocorrelation signal generation component 2 is located within this propagation length L.

[0039] For example, when the ridge of the dihedral mirror 11 is vertical, the propagation length L can be expressed as:

[0040] Where D is the transverse spot diameter of the incident laser 12, ensuring that the dihedral reflector 11 can completely capture the incident laser 12. The angle between the propagation direction of the first split laser beam 13 and the propagation direction of the second split laser beam 14 is given. .

[0041] When the ridge of the dihedral mirror 11 is horizontal, the propagation length L can be expressed as:

[0042] Where D is the transverse spot diameter of the incident laser 12, ensuring that the dihedral reflector 11 can completely capture the incident laser 12. The angle between the propagation direction of the first split laser beam 13 and the propagation direction of the second split laser beam 14 is given. It can be represented as .

[0043] According to the example embodiment, the signal transmission detection component 3 is set in the preset propagation path of the autocorrelation signal 15, and is used to receive the autocorrelation signal 15, image the autocorrelation signal 15 onto the target imaging plane, and output the two-dimensional image corresponding to the autocorrelation signal 15 on the target imaging plane, so as to determine the pulse width of the laser 12 to be tested based on the two-dimensional image.

[0044] The preset propagation path of the autocorrelation signal 15 can be the designed propagation path of the autocorrelation signal 15. For example, see Figure 3 , Figure 5 , Figure 6 and Figure 8 The preset propagation path of the autocorrelation signal 15 can be in the horizontal direction.

[0045] The target imaging plane can be an imaging plane in which the autocorrelation signal 15 is clearly projected on a scale. The two-dimensional image can be a spatial light intensity distribution map containing information on the pulse time characteristics of the laser under test 12. The signal transmission and detection component 3 outputs the two-dimensional image corresponding to the autocorrelation signal 15 on the target imaging plane. By analyzing the two-dimensional image, the spatial width of the autocorrelation signal 15 can be determined. Then, based on the spatial width of the autocorrelation signal 15, the pulse width of the laser under test 12 can be determined.

[0046] Through the above embodiments, the technical solution of this application spatially divides the laser under test into two equal beams (i.e., the first beam and the second beam) on both sides of the ridge, and they continue to propagate in two directions at a certain angle, without the need for additional time synchronization mechanisms such as delay lines. The technical solution of this application, by setting a metal-based coating on the surfaces of the first and second reflective surfaces, can ensure almost zero dispersion within the bandwidth of the laser under test, thereby avoiding the introduction of additional material dispersion and chromatic dispersion during the synchronization and beam splitting of the laser under test.

[0047] The technical solution of this application generates an autocorrelation signal in the overlapping area of ​​the first and second split laser beams through an autocorrelation signal generation component, and images the autocorrelation signal onto the target imaging plane and outputs a two-dimensional image through a signal transmission detection component, thereby determining the pulse width of the laser to be tested.

[0048] The technical solution of this application avoids introducing additional material dispersion and chromatic dispersion while simultaneously splitting the laser under test and generating autocorrelation signals, ensuring that the pulse width of the laser under test is not affected before the generation of autocorrelation signals.

[0049] Optionally, see Figure 3 , Figure 5 , Figure 6 and Figure 8 The autocorrelation signal generation component 2 includes a nonlinear crystal 21 and a filter (not shown in the figure).

[0050] According to the example embodiment, the nonlinear crystal 21 is positioned within the propagation length of the autocorrelation signal generated by the first split laser 13 and the second split laser 14. The nonlinear crystal 21 is used to generate the autocorrelation signal 15. The nonlinear crystal 21 utilizes the femtosecond laser and frequency effect to generate the autocorrelation signal for pulse width measurement. Common nonlinear crystals include BBO (β-Barium Borate), LBO (Lithium Triborate), and KDP (Potassium Dihydrogen Phosphate). For near-infrared femtosecond lasers with pulse widths ranging from a few femtoseconds to hundreds of femtoseconds, the nonlinear crystal 21 can be a BBO crystal, with a typical thickness range of 5μm to 100μm. The shorter the laser pulse width to be measured and the wider the required spectral bandwidth, the thinner the matching nonlinear crystal 21 should be.

[0051] A filter can be attached to the surface of the nonlinear crystal 21 where the autocorrelation signal 15 is output, in order to preserve the propagation of the autocorrelation signal 15. For example, the filter can preserve the propagation of the autocorrelation signal 15 while filtering out the propagation of the first split laser beam 13 and the second split laser beam 14 towards the target imaging plane after beam splitting.

[0052] Through the above embodiments, the technical solution of this application can generate autocorrelation signals using a nonlinear crystal (the nonlinear crystal utilizes femtosecond lasers and frequency effects), while avoiding the introduction of additional material dispersion and chromatic dispersion. The technical solution of this application can retain the propagation of the autocorrelation signal using filters, avoiding the influence of the first and second split laser beams on the pulse width measurement accuracy.

[0053] Optionally, see Figure 3 , Figure 5 , Figure 6 and Figure 8 The signal transmission and detection component 3 includes an achromatic lens 31, a pinhole filter 32, a polarizer 33, and an area array detector 34.

[0054] The achromatic lens 31 is used to image the autocorrelation signal 15 onto the target imaging plane at a preset imaging magnification. The preset imaging magnification of the achromatic lens 31 is greater than 1, that is, it forms a magnified image on the target imaging plane, which can improve measurement accuracy.

[0055] The pinhole filter 32 is positioned after the achromatic lens 31 to filter out the residual scattered fundamental frequency light of the autocorrelation signal 15. The pinhole filter filters near the focal plane of the achromatic lens 31, improving image quality and further filtering out the influence of residual scattered fundamental frequency light at different propagation directions.

[0056] The polarizer 33 is rotatably positioned along the preset propagation path of the autocorrelation signal 15, after the pinhole filter 32, to adjust the intensity of the autocorrelation signal 15. The polarizer 33 utilizes the polarization characteristics of the autocorrelation signal 15 to achieve intensity adjustment; the intensity of the output autocorrelation signal 15 is adjusted by rotating the angle of the polarizer 33.

[0057] The area array detector 34 is positioned on the target imaging plane after the polarizer 33, parallel to the polarizer 33, and outputs the autocorrelation signal 15 from the polarizer 33 as a two-dimensional image. The area array detector 34 detects the autocorrelation signal 15 at the imaging target plane and outputs a two-dimensional image. The position of the area array detector 34 can be represented as follows:

[0058] in, The distance from the area array detector 34 to the achromatic lens 31 is [distance missing]. The nonlinear crystal 21 represents the distance to the achromatic lens 31. The focal length of the achromatic lens 31.

[0059] For example, the area array detector 34 can be a device such as a CCD (Charge-coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

[0060] The waveform of the autocorrelation signal 15 can be obtained by integrating the two-dimensional image along a given direction (the same direction as the ridge line). The width of the autocorrelation signal is calculated from the waveform, and then combined with the angle between the propagation directions of the first beam laser 13 and the second beam laser 14. Imaging magnification Autocorrelation convolution factor The pulse width of the laser 12 under test can be determined. The pulse width of the laser 12 under test can be expressed as follows:

[0061] in, The pulse width of the laser 12 to be tested is given. This is the preset imaging magnification of the achromatic lens 31. The width of the autocorrelation signal 15. It is the speed of light.

[0062] For example, Figure 10 This diagram illustrates a test result of the autocorrelation signal and the laser pulse width signal under test. (Example:) Figure 10 As shown, the width of the autocorrelation signal 15 , , , , Then the pulse width of the laser 12 under test can be calculated. .

[0063] Optionally, see Figure 3 , Figure 5 , Figure 6 and Figure 8 The single-shot autocorrelator 100 also includes an optical path collimation assembly 4. The optical path collimation assembly 4 includes a first aperture 41, a beam-splitting guide mirror 42, and a beam-splitting guide mirror 42.

[0064] The first aperture 41 is disposed in the incident path of the laser 12 under test and is used to adjust the incident position of the laser 12 under test. For example, the first aperture 41 can be an adjustable aperture, which serves as the light-passing aperture of the incident space of the laser 12 under test and as the initial optical axis reference. By adjusting the position of the center of the aperture of the first aperture 41 into which the laser 12 under test is incident, the lateral offset of the laser 12 under test is corrected, ensuring that the laser beam is incident on the dihedral reflector 11 at a preset position.

[0065] After beam splitting, the light guide mirror 42 is positioned in the propagation path of the first split laser 13. It is used to receive the first split laser 13 and transmit it to the second aperture 43. The second aperture 43 is used as the final optical axis reference. The second aperture 43 and the first aperture 41 together lock the position and direction of the entire optical path (the laser under test 12, the first split laser 13, the second split laser 14 and the autocorrelation signal 15) to ensure that it travels according to the preset optical path and direction.

[0066] The technical solution of this application can fix the propagation path of the laser under test through the optical path collimation component, so that after the laser under test is incident, it can be aligned with the designed optical path based on the first and second apertures, thus ensuring the overall function of the single-shot autocorrelator is realized.

[0067] Optionally, see Figure 3 , Figure 5 , Figure 6 and Figure 8The single-shot autocorrelator 100 also includes a baffle 5. The baffle 5 is disposed in the propagation path of the second beam-splitting laser 14 to block the transmission of the second beam-splitting laser 14. The baffle 5 can be a ceramic baffle.

[0068] Optionally, the single-shot autocorrelator 100 also includes a housing (not shown in the figure). The housing is disposed around the exterior of the beam splitting synchronization component 1, the autocorrelation signal generation component 2, the signal transmission detection component 3, the optical path collimation component 4, and the baffle 5. The beam splitting synchronization component 1, the autocorrelation signal generation component 2, the signal transmission detection component 3, the optical path collimation component 4, and the baffle 5 are all integrated into the housing, achieving a compact design for the single-shot autocorrelator.

[0069] Finally, it should be noted that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A beam-splitting synchronization component for a single-shot autocorrelator, characterized in that, include: A dihedral mirror includes an intersecting first and second reflective surfaces, and both the surfaces of the first and second reflective surfaces are coated with a metal-based film. The laser beam to be tested is incident on the ridge of the dihedral reflector, and after passing through the first reflecting surface, it is emitted as the first split laser beam, and after passing through the second reflecting surface, it is emitted as the second split laser beam; The angle bisector of the angle between the propagation direction of the first split laser and the propagation direction of the second split laser is perpendicular to the incident optical axis of the laser under test.

2. The beam splitting synchronization component according to claim 1, characterized in that, When the ridge line of the dihedral reflector is vertically set, the incident optical axis of the laser to be tested is perpendicular to the ridge line, and the first split laser beam and the second split laser beam propagate in the horizontal plane.

3. The beam splitting synchronization component according to claim 1, characterized in that, When the ridge line of the dihedral reflector is horizontal, the optical axis of the laser to be tested is located at the angle bisector of the first and second reflecting surfaces, and the first and second split laser beams propagate in a vertical plane.

4. The beam splitting synchronization component according to claim 1, characterized in that, The metal material used in the coating is one of gold, silver, aluminum, or copper.

5. A single-shot autocorrelation instrument, characterized in that, Including the beam splitting synchronization component as described in any one of claims 1-4, the single-shot autocorrelator further includes: An autocorrelation signal generation component is disposed in the region where the first beam splitter and the second beam splitter generate autocorrelation signals, and is used to generate autocorrelation signals; A signal transmission detection component is disposed in a preset propagation path of the autocorrelation signal, for receiving the autocorrelation signal, imaging the autocorrelation signal onto a target imaging plane, and outputting a two-dimensional image corresponding to the autocorrelation signal on the target imaging plane, so as to determine the pulse width of the laser under test based on the two-dimensional image.

6. The single-shot autocorrelation instrument according to claim 5, characterized in that, The autocorrelation signal generation component includes: A nonlinear crystal is disposed in the region where the first and second beam-splitting lasers generate autocorrelation signals, and is used to generate autocorrelation signals; A filter is used to filter the autocorrelation signal.

7. The single-shot autocorrelation instrument according to claim 5, characterized in that, The signal transmission detection component includes: An achromatic lens is used to image the autocorrelation signal onto the target imaging plane at a preset imaging magnification. A pinhole filter is disposed after the achromatic lens to filter out the residual scattered fundamental frequency light of the autocorrelation signal; A bias selector is rotatably disposed in the preset propagation path of the autocorrelation signal, and is disposed after the pinhole filter to adjust the intensity of the autocorrelation signal; An area array detector is positioned on the target imaging plane after the polarizer, parallel to the polarizer, and outputs the autocorrelation signal from the polarizer as the two-dimensional image.

8. The single-shot autocorrelation instrument according to claim 5, characterized in that, The single-shot autocorrelation instrument also includes: The optical path collimation assembly includes: The first aperture is set in the incident path of the laser to be tested and is used to align the incident position of the laser to be tested. A beam-splitting guide mirror is positioned in the propagation path of the first split laser beam to receive the first split laser beam and adjust its propagation direction. The second aperture is positioned along the adjusted propagation path of the first split laser beam and is used to align the propagation position of the first split laser beam.

9. The single-shot autocorrelation instrument according to claim 5, characterized in that, The single-shot autocorrelation instrument also includes: A baffle is positioned in the propagation path of the second split laser beam.

10. The single-shot autocorrelation instrument according to claim 5, characterized in that, The single-shot autocorrelation instrument also includes: A housing is disposed around the exterior of the beam splitting synchronization component, the autocorrelation signal generation component, and the signal transmission detection component.

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