Giant dispersion fully chirped planar grating pulse compression device

Abstract

The present invention discloses a giant dispersion fully chirped plane grating pulse compression device, comprising a dispersion generator, a grating pair consisting of two parallel chirped plane gratings with varying grating periods, and a beam reflection system. The dispersion generator can spatially separate and emit parallel spectral components of the light beam to be compressed without introducing a phase difference. The grating pair consisting of chirped plane gratings can significantly increase the optical path difference between the spectral components. The coordinated use of the beam reflection system can return the light beam along its original path, facilitating the construction of a compact pulse compressor. While having the same grating spacing as a traditional pulse compressor, the present invention can introduce a more significant phase difference, output a higher dispersion value, and thereby exhibit superior pulse compression performance. Therefore, the technical solution provided by the present invention effectively promotes the development of high-performance pulse compressors.

Description

Technical Field

[0001] The present invention relates to laser pulse compression, in particular to a giant dispersion fully chirped plane grating pulse compression device. Background Art

[0002] Thanks to their ultrahigh peak power and ultrashort duration, ultraintense, ultrashort laser pulses offer unprecedented extreme physical conditions and novel experimental methods. These technologies provide a fundamental basis and scientific foundation for innovative development in strategic high-tech fields such as ultrahigh-gradient high-energy particle accelerators, high-brightness coherent light sources in new wavelength bands, laser nuclear physics and medicine, fusion energy, and precision measurement. Chirped pulse amplification (CPA) and optical parametric chirped pulse amplification (OPCPA), key technologies for achieving ultraintense, ultrashort laser output, involve pulse compressors. Symmetrical four-grating pulse compressors based on the Treacy compressor structure are employed in the vast majority of ultraintense, ultrashort laser systems. In addition to producing dispersion with a magnitude essentially equal to and opposite to that introduced by stretchers and amplifiers in high-power laser devices, researchers anticipate that these pulse compressors will be able to provide substantial dispersion to support the output of ultrashort laser pulses.

[0003] Recently, researchers have proposed an ultrafast laser pulse compression device and method based on variable grating line spacing (Reference 1: Patent (Application Number) 202311681865.4). This invention, based on the traditional Treacy compressor configuration, constructs a pulse compression device consisting of a first grating component with a fixed line spacing and a second grating component with a variable line spacing. This device is used to address the existing problems in regulating the high-order dispersion output of the pulse compression device. Apart from this, no other inventions have been reported regarding pulse compressors that can output high-order dispersion and are equipped with chirped plane gratings with variable grating period.

[0004] In view of this, the present invention combines a chirped planar grating pair with varying grating period, a dispersion generator and a beam reflection system to propose a fully chirped planar grating pulse compression device that can produce more massive dispersion compared to traditional pulse compressors, and enables the compression device to exhibit superior pulse width compression performance under the premise of the same grating spacing. Summary of the Invention

[0005] The purpose of the present invention is to construct a giant dispersion fully chirped planar grating pulse compression device, and the present invention achieves this purpose through the following technical solutions:

[0006] The giant dispersion fully chirped plane grating pulse compression device specifically comprises a dispersion generator placed in sequence along the advancing direction of the light beam to be compressed, a grating pair consisting of two parallel reflective chirped plane gratings, and a light beam reflection system.

[0007] The dispersion generator is used to spatially separate all spectral components of the light beam to be compressed, and to cause all spectral components of the spatially separated light beam to be compressed to be emitted in parallel. The dispersion generator comprises a dispersion element and a beam collimation system. The dispersion element includes, but is not limited to, a prism or a grating, and the beam collimation system includes, but is not limited to, beam collimation elements such as a reflective parabolic mirror and a collimating lens. The phase difference between all spectral components of the light beam to be compressed remains unchanged before and after the dispersion generator is activated.

[0008] The two reflective chirped planar gratings in the grating pair are a first grating and a second grating with varying grating periods. The first and second gratings have the same grating period variation range and unequal effective area widths. The grating stripe surfaces of the first and second gratings are both located inside the grating pair.

[0009] When the grating period varies linearly, the grating periods of the first grating and the second grating satisfy the following relationship:

[0010]

[0011] Where C Λ is the linear variation coefficient of the grating period, x is the position parameter on the grating, and the value range of x is [0,L i ], L i is the effective area width of the grating (subscript i = 1, 2, representing the first grating and the second grating, respectively), and Λ0 is the grating period at the center of the grating.

[0012] When the grating period has a nonlinear variation, the grating periods of the first grating and the second grating satisfy the following relationship:

[0013]

[0014] Where C Λ,1 、C Λ,2 、C Λ,3 、C Λ,4 and C Λ,5 are the first, second, third, fourth and fifth coefficients of the nonlinear variation of the grating period respectively.

[0015] The beam reflection system includes, but is not limited to, beam reflection elements such as a roof reflector. The beam reflection system can cause the beam output from the grating pair to be reflected along its original path or after only a change in height, and then pass through the grating pair and the dispersion generator in sequence, thereby compressing the pulse width of the beam to be compressed.

[0016] The grating periods of the same spectral component of the light beam to be compressed at the diffraction position of the first grating and the second grating are equal, so that all spectral components of the spatially separated light beam to be compressed still remain parallel after passing through the grating pair.

[0017] After the dispersion generator acts, the width W of the light spot formed by all spectral components of the parallel-emitted spatially separated light beam to be compressed and the effective area width L1 of the first grating satisfy the following relationship:

[0018] W=L1cosθ in1

[0019] Where θ in1 is the angle of incidence of all spectral components of the spatially separated light beam to be compressed on the first grating.

[0020] The effective area width L1 of the first grating and the effective area width L2 of the second grating satisfy the following relationship:

[0021] L2=G 12 (tanθ out1l -tanθ out1s )+L1

[0022] Where G 12 is the vertical distance between the first grating and the second grating, θ out1l is the diffraction angle of the longest wavelength spectral component of the beam to be compressed at the first grating, θ out1s is the diffraction angle of the spectral component with the shortest wavelength of the light beam to be compressed at the first grating.

[0023] A method for adjusting the output dispersion of the giant dispersion fully chirped plane grating pulse compression device comprises the following steps:

[0024] (A) According to the structure of the giant dispersion fully chirped plane grating pulse compression device, a dispersion generator, a grating pair consisting of a first grating and a second grating of a reflective chirped plane grating parallel to each other, and a beam reflection system are sequentially placed along the direction of travel of the light beam to be compressed, and the light beam to be compressed is made to pass through the optical fiber at an incident angle θ. ind irradiating the dispersion generator;

[0025] (B) Set the incident angle θ of all spectral components of the spatially separated beam to be compressed at the first grating in1and the effective area width L1 of the first grating. The grating period of the first grating is set according to the relationship satisfied by the grating period. According to the relationship satisfied by the width W of the spot formed by all spectral components of the spatially separated parallel-emitted light beam to be compressed and the effective area width L1 of the first grating, the dispersion generator is adjusted so that the spot width W of all spectral components of the spatially separated light beam to be compressed is equal to the cosine value cosθ of the incident angle of all spectral components of the spatially separated light beam to be compressed at the first grating. in1 The product of

[0026] (C) Setting the effective area width L2 of the second grating and making the grating period range of the second grating equal to the grating period range of the first grating. According to the relationship between the effective area width L1 of the first grating and the effective area width L2 of the second grating, determining the vertical distance G between the first grating and the second grating. 12 According to G 12 , translating the second grating so that the diffracted light after being diffracted by the first grating is irradiated into the effective area of ​​the second grating;

[0027] (D) Adjusting the position of the beam reflection system so that the beam output from the grating pair is reflected along the original path or only reflected after a height change and passes through the grating pair and the dispersion generator in sequence, thereby compressing the pulse width of the beam to be compressed.

[0028] (E) Adjusting the dispersion output by the giant dispersion fully chirped plane grating pulse compression device is achieved by the following three methods:

[0029] Method 1: Maintain the effective area widths L1 and L2 of the first grating and the second grating, the grating period range, and the vertical distance G 12 The linear variation coefficient or nonlinear variation coefficient of the grating period of the first grating and the second grating is adjusted;

[0030] Method 2: Keep the effective area widths L1 and L2 of the first grating and the second grating unchanged, adjust the grating period range of the first grating and the second grating, and adjust the vertical distance G between the first grating and the second grating accordingly. 12 ;

[0031] Method 3: Keep the grating period range of the first grating and the second grating unchanged, adjust the effective area width L2 of the second grating, and adjust the vertical distance G between the first grating and the second grating accordingly. 12 .

[0032] Compared with the traditional pulse compressor, the technical effects of the present invention are as follows:

[0033] 1. While maintaining the same grating spacing as conventional pulse compressors, the giant-dispersion fully-chirped planar grating pulse compression device described in this invention can provide greater dispersion and superior pulse compression performance. This can facilitate the development of high-performance pulse compressors.

[0034] 2. The present invention only requires that "the spot width W of all spectral components of the to-be-compressed light beam after spatial separation is equal to the effective area width L1 of the first grating and the cosine value cosθ of the incident angle of all spectral components of the to-be-compressed light beam after spatial separation at the first grating" in1 The product of "the diffracted light after being diffracted by the first grating is irradiated into the effective area of ​​the second grating", which effectively reduces the difficulty of actually constructing the pulse compressor.

[0035] 3. By utilizing a dispersion generator to convert the light beam to be compressed into spatially separated parallel spectral components, and combining this with the use of a grating pair consisting of chirped plane gratings, the present invention effectively solves the problem that all spectral components output by the second grating after the grating period changes are not parallel to each other.

[0036] 4. By employing a dispersion generator and a grating pair composed of chirped planar gratings in conjunction with a beam reflection system, the present invention achieves the return of a beam along its original path, or after a change in height, without adding new optical components or changing the device structure, thereby compressing the pulse width of the beam to be compressed. This contributes to the development of pulse compressors that are easier to assemble and adjust, have greater stability, and are more compact.

[0037] 5. By changing the effective area width, grating period range, vertical distance, grating period linear variation coefficient or nonlinear variation coefficient of the first grating and the second grating of the chirped plane grating type, the present invention can achieve the adjustment of the output dispersion value of the giant dispersion fully chirped plane grating pulse compression device, which has important economic and practical value in the field of high-power lasers. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a dispersion generator constructed with a constant-period grating and a reflective parabolic mirror according to an embodiment of the present invention.

[0039] Figure 2 This is a schematic structural diagram of the giant dispersion fully chirped plane grating pulse compression device of the present invention.

[0040] Figure 3Graph showing the dependence of the first-order dispersion GD(λ) and the second-order dispersion GDD(λ) on the beam wavelength λ of the giant dispersion fully chirped plane grating pulse compression device according to an embodiment of the present invention.

[0041] Figure 4 Graph showing the dependence of the third-order dispersion TOD(λ) and fourth-order dispersion FOD(λ) on the beam wavelength λ of the giant dispersion fully chirped plane grating pulse compression device according to an embodiment of the present invention.

[0042] Figure 5 Graphs showing the dependence of the first-order dispersion GD(λ), second-order dispersion GDD(λ) and beam wavelength λ of a conventional pulse compressor having the same grating pitch as the giant dispersion fully chirped plane grating pulse compression device according to an embodiment of the present invention.

[0043] Figure 6 Graphs showing the dependence of the third-order dispersion TOD(λ), fourth-order dispersion FOD(λ) and beam wavelength λ of a conventional pulse compressor having the same grating spacing as the giant dispersion fully chirped plane grating pulse compression device according to an embodiment of the present invention.

[0044] Figure 7 Graph showing the dependence of the first-order dispersion GD(λ) and the second-order dispersion GDD(λ) on the beam wavelength λ of the dispersion-adjusted giant dispersion fully-chirped plane grating pulse compression device according to an embodiment of the present invention.

[0045] Figure 8 This is a curve showing the dependence of the third-order dispersion TOD(λ) and fourth-order dispersion FOD(λ) of the giant dispersion fully chirped plane grating pulse compression device after dispersion adjustment on the beam wavelength λ of an embodiment of the present invention.

[0046] In the figure, 1 is the dispersion generator, 2 is the first grating, 3 is the second grating, 4 is a grating pair consisting of the first grating and the second grating that are parallel to each other, 5 is the beam reflection system, 11 is the dispersion element of the dispersion generator (a plane grating with a constant period), 12 is the beam collimation system of the dispersion generator (a reflective parabolic mirror), and the solid line represents the shortest wavelength λ of the light beam to be compressed. s The dotted line represents the longest wavelength λ of the beam to be compressed. l spectral components of θ. ind represents the incident angle of the beam to be compressed at the dispersion generator, θ in1 represents the incident angles of all spectral components of the spatially separated, mutually parallel beams to be compressed on the first grating, θ out1s ,θ out1lare the diffraction angles of the shortest and longest wavelength spectral components of the beam to be compressed at the first grating, respectively; W is the width of the spot formed after all spectral components of the beam to be compressed are spatially separated after passing through the dispersion generator; L1 is the effective area width of the first grating; L2 is the effective area width of the second grating; G 12 is the vertical distance between the first grating and the second grating. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and examples, but the scope of protection of the present invention should not be limited thereto.

[0048] Example:

[0049] The parameters of the beam to be compressed are set as follows: the spectral shape of the beam to be compressed is Gaussian, the central wavelength is 925.00 nm, the spectral width is 50.00 nm, and the incident angle θ of the beam to be compressed irradiated to the dispersion generator is ind The incident angle θ of all spectral components of the spatially separated beam to be compressed at the first grating is 61°. in1 It is 61°.

[0050] Combine Figure 1 The parameters of the dispersion generator of a giant dispersion fully chirped plane grating pulse compression device are set as follows: a constant-period plane grating is used as the dispersion element of the dispersion generator, and a reflective parabolic mirror is used as the beam collimation system of the dispersion generator. The grating period of the constant-period plane grating is 714.29 nm.

[0051] Combine Figure 2 , set the effective area width L1 of the first grating to 20.00mm, and set the first grating to have a nonlinear grating period, which is the value of the first, second, third, fourth and fifth coefficients of the nonlinear grating period are C Λ,1 =1.625×10 -7 m、C Λ,2 =0.97, C Λ,3 =0.3724m, C Λ,4 =0.23, C Λ,5 =0.23, at this time the grating period range of the first grating is 643.00nm~805.21nm.

[0052] At this time, the distance between the beam collimation system of the dispersion generator and the dispersion element of the dispersion generator is adjusted to 10.33 cm, so that the spot width W of all spectral components of the parallel-emitted compressed light beam after spatial separation is 9.70 mm. This spot width is exactly equal to the effective area width L1 of the first grating and the cosine value cosθ of the incident angle of all spectral components of the spatially separated compressed light beam at the first grating. in1 In addition, the wavelengths of the spectral components of the spatially separated light beams to be compressed increase from top to bottom in the vertical direction.

[0053] The effective area width L2 of the second grating is set to 50.00 mm, and the grating period range of the second grating is set to be equal to the grating period range of the first grating, that is, 643.00 nm to 805.21 nm. According to the relationship between the effective area width L1 of the first grating and the effective area width L2 of the second grating, the vertical distance G between the first grating and the second grating is obtained. 12 =5.94cm. According to G 12 The second grating is translated so that the diffracted light after being diffracted by the first grating is irradiated into the effective area of ​​the second grating.

[0054] The position of the beam reflection system is adjusted so that the beam output from the grating pair is reflected along the original path or only reflected after a height change and passes through the grating pair and the dispersion generator in sequence, thereby compressing the pulse width of the beam to be compressed.

[0055] Finally, the dispersion value of the giant dispersion fully chirped plane grating pulse compression device is solved. The first-order dispersion GD(λ) curve, second-order dispersion GDD(λ) curve, third-order dispersion TOD(λ) curve, and fourth-order dispersion FOD(λ) curve of the giant dispersion fully chirped plane grating pulse compression device are respectively as follows: Figure 3 、 Figure 4 As shown. Figure 3 and Figure 4 The results show that the second-order dispersion GDD provided by the giant dispersion fully chirped plane grating pulse compression device at the central wavelength of 925nm, which has a significant impact on the pulse width, is -1.57×10 8 fs 2 , a chirped Gaussian pulse with a pulse width of 17.31ns can be compressed into a Fourier transform limited Gaussian pulse with a pulse width of 25.17fs.

[0056] In contrast, the grating period of all gratings in the conventional pulse compressor is set to 714.29nm, the spacing between the two grating pairs is 5.94cm, and other variables are kept constant. The first-order dispersion GD(λ), second-order dispersion GDD(λ), third-order dispersion TOD(λ), and fourth-order dispersion FOD(λ) curves of the conventional pulse compressor are shown as follows: Figure 5 、 Figure 6 As shown. Figure 5 and Figure 6 As a result, the second-order dispersion GDD provided by the conventional pulse compressor at the central wavelength of 925nm, which has a significant impact on the pulse width, is -4.37×10 5 fs 2 , a chirped Gaussian pulse with a pulse width of 48.13ps can be compressed into a Fourier transform limited Gaussian pulse with a pulse width of 25.17fs.

[0057] according to Figures 3 to 6 As a result, the first-order dispersion GD, second-order dispersion GDD, third-order dispersion TOD and fourth-order dispersion FOD provided by the giant dispersion fully-chirped plane grating pulse compression device at the central wavelength of 925nm are approximately 24.58 times, 359.74 times, 1778.21 times and 9075.98 times of the first-order dispersion GD, second-order dispersion GDD, third-order dispersion TOD and fourth-order dispersion FOD provided by a traditional pulse compressor with equal grating spacing.

[0058] In addition, taking the example of changing the linear variation coefficient or nonlinear variation coefficient of the grating period of the first grating and the second grating, the output dispersion of the giant dispersion fully chirped plane grating pulse compression device is adjusted (other adjustment methods are similar and will not be repeated). On the basis of keeping other conditions unchanged, only the grating period of the first grating and the second grating is changed from nonlinear change to linear change. Specifically, the linear variation coefficient of the grating period of the first grating is -8.11nm / mm, and the linear variation coefficient of the grating period of the second grating is -3.24nm / mm. The first-order dispersion GD(λ) curve, the second-order dispersion GDD(λ) curve, the third-order dispersion TOD(λ) curve, and the fourth-order dispersion FOD(λ) curve of the giant dispersion fully chirped plane grating pulse compression device are shown as follows: Figure 7 、 Figure 8 As shown. Figure 3 、 Figure 4 、 Figure 7 and Figure 8 As a result, the giant dispersion fully chirped plane grating pulse compression device provides a second-order dispersion GDD that has a significant impact on the pulse width at a central wavelength of 925nm, which is reduced from -1.57×10 8 fs 2 Change to -1.89×108 fs 2 At this time, the giant dispersion fully chirped plane grating pulse compression device can compress the chirped Gaussian pulse with a pulse width of 20.84ns into a Fourier transform limited Gaussian pulse with a pulse width of 25.17fs.

[0059] The above-described embodiments demonstrate that, while maintaining the same grating spacing as conventional pulse compressors, the giant-dispersion fully-chirped plane grating pulse compression device described herein can provide greater dispersion, thereby exhibiting superior pulse compression performance compared to conventional pulse compressors, by utilizing a dispersion generator, a grating pair consisting of chirped plane gratings with varying grating periods, and a beam reflection system. Furthermore, by varying the effective area width, grating period range, vertical distance, and linear or nonlinear grating period variation coefficients of the first and second chirped plane gratings, the present invention can adjust the output dispersion of the giant-dispersion fully-chirped plane grating pulse compression device described herein.

[0060] The above embodiments are used to illustrate the present invention rather than to limit the present invention. Any modifications and changes made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A giant dispersion fully chirped planar grating pulse compression device, characterized by: The invention comprises a dispersion generator (1) placed in sequence along the advancing direction of the light beam to be compressed, a grating pair (4) consisting of two parallel reflective chirped plane gratings, and a light beam reflection system (5); The dispersion generator (1) is used to spatially separate all spectral components of the light beam to be compressed, and to make all spectral components of the spatially separated light beam to be compressed emerge in parallel; The grating pair (4) is composed of a first grating (2) and a second grating (3) with varying grating periods, and the first grating (2) and the second grating (3) have the same grating period variation range and unequal effective area widths, and the grating stripe surfaces of the first grating (2) and the second grating (3) are both located inside the grating pair (4); When the grating period varies linearly, the grating periods of the first grating (2) and the second grating (3) satisfy the following relationship: Where C Λ is the linear variation coefficient of the grating period, x is the position parameter on the grating, and the value range of x is [0,L i ], L i is the effective area width of the grating, the subscripts i = 1, 2 represent the first grating (2) and the second grating (3), respectively, and Λ0 is the grating period at the grating center; When the grating period has a nonlinear variation, the grating periods of the first grating (2) and the second grating (3) satisfy the following relationship: Where C Λ,1 、C Λ,2 、C Λ,3 、C Λ,4 and C Λ,5 are the first, second, third, fourth and fifth coefficients of the nonlinear variation of the grating period; x is the position parameter on the grating, and the value range of x is [0,L i ], L i is the effective area width of the grating, and the subscripts i=1,2 represent the first grating (2) and the second grating (3), respectively; The light beam reflection system (5) is used to make the light beam output from the grating pair (4) reflect along its original path or reflect only after a height change and pass through the grating pair (4) and the dispersion generator (1) in sequence, thereby compressing the pulse width of the light beam to be compressed.

2. The giant dispersion fully chirped plane grating pulse compression device according to claim 1, characterized in that: The grating periods of the same spectral component of the light beam to be compressed at the diffraction positions of the first grating (2) and the second grating (3) are equal, so that all spectral components of the spatially separated light beam to be compressed still remain parallel after passing through the grating pair (4).

3. The giant dispersion fully chirped plane grating pulse compression device according to claim 1 or 2, characterized in that: The dispersion generator (1) comprises a prism or a grating and a beam collimation system, and the beam collimation system comprises a reflective parabolic mirror or a collimating lens; before and after the action of the dispersion generator (1), the phase difference between all spectral components of the light beam to be compressed remains unchanged.

4. The giant dispersion fully chirped plane grating pulse compression device according to claim 1 or 2, characterized in that: The light beam reflection system (5) comprises a roof reflector.

5. The giant dispersion fully chirped plane grating pulse compression device according to any one of claims 1 to 4, characterized in that: After the dispersion generator (1) acts, the width W of the light spot formed by all spectral components of the parallel-emitted spatially separated light beam to be compressed and the effective area width L1 of the first grating (2) satisfy the following relationship: W=L1cosθ in1 Where θ in1 is the angle of incidence of all spectral components of the spatially separated light beam to be compressed on the first grating (2).

6. The giant dispersion fully chirped plane grating pulse compression device according to any one of claims 1 to 4, characterized in that: The effective area width L1 of the first grating (2) and the effective area width L2 of the second grating (3) satisfy the following relationship: <h2 style=";text-align:left;direction:ltr">L2=G<h2 style=";text-align:left;direction:ltr"> 12 <h2 style=";text-align:left;direction:ltr"> (tanθ<h2 style=";text-align:left;direction:ltr"> out1l <h2 style=";text-align:left;direction:ltr"> -tanθ<h2 style=";text-align:left;direction:ltr"> out1s <h2 style=";text-align:left;direction:ltr"> )+L1 Where G 12 is the vertical distance between the first grating (2) and the second grating (3), θ out1l is the diffraction angle of the longest wavelength spectral component of the light beam to be compressed at the first grating (2), θ out1s is the diffraction angle of the spectral component with the shortest wavelength of the light beam to be compressed at the first grating (2).

7. A method for adjusting the output dispersion of the giant dispersion fully chirped plane grating pulse compression device according to any one of claims 1 to 6, characterized in that: The steps include: S1. A dispersion generator (1), a grating pair (4) consisting of a first grating (2) and a second grating (3) of a reflective chirped plane grating parallel to each other, and a beam reflection system (5) are sequentially placed along the direction of travel of the light beam to be compressed, and the light beam to be compressed is incident at an angle of θ. ind irradiating the dispersion generator; S2. Set the incident angle θ of all spectral components of the spatially separated beam to be compressed at the first grating (2) in1 and the effective area width L1 of the first grating (2); setting the grating period of the first grating (2), adjusting the dispersion generator so that the spot width W of all spectral components of the to-be-compressed light beam after spatial separation is equal to the cosine value cosθ of the incident angle of all spectral components of the to-be-compressed light beam after spatial separation at the first grating (2). in1 The product of S3. Set the effective area width L2 of the second grating (3) and make the grating period range of the second grating (3) equal to the grating period range of the first grating (2); confirm the vertical distance G between the first grating (2) and the second grating (3) 12 , according to G 12 The second grating (3) is translated according to the value of , so that the diffracted light after being diffracted by the first grating (2) is irradiated into the effective area of ​​the second grating (2); S4. adjusting the position of the beam reflection system (5) so that the beam output from the grating pair (4) is reflected along its original path or only reflected after a height change and sequentially passes through the grating pair (4) and the dispersion generator (1), thereby compressing the pulse width of the beam to be compressed; S5. The dispersion adjustment of the output of the giant dispersion fully chirped plane grating pulse compression device is achieved by maintaining the effective area widths L1 and L2 of the first grating (2) and the second grating (3), the grating period range, and the vertical distance G 12 The first grating (2) and the second grating (3) are kept unchanged, and the linear variation coefficient or nonlinear variation coefficient of the grating period of the first grating (2) and the second grating (3) is adjusted; or the effective area widths L1 and L2 of the first grating (2) and the second grating (3) are kept unchanged, and the grating period range of the first grating (2) and the second grating (3) is adjusted, and the vertical distance G between the first grating (2) and the second grating (3) is adjusted accordingly. 12 or keep the grating period range of the first grating (2) and the second grating (3) unchanged, adjust the effective area width L2 of the second grating (3), and adjust the vertical distance G between the first grating (2) and the second grating (3) accordingly. 12 .

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