CN218003858U - Chirp pulse stretching and compressing device and amplifying system - Google Patents

Abstract

The application discloses chirped pulse stretching and compressing device and amplifying system relates to the laser field. The chirped pulse stretching and compressing device comprises a first polarization splitting prism, a pulse stretching compressor and a dispersion adjuster. The chirp pulse stretching and compressing device is provided with a stretching port and a compressing port which are arranged oppositely and are divided into a stretching optical path part and a compressing optical path part, the two parts of optical paths share a main body stretching-compressing module, and a dispersion regulator is additionally arranged on the stretching optical path part to provide adjustable and extra dispersion compensation. The chirp pulse widening and compressing device can be flexibly adapted to different amplification systems, so that output light pulses can reach near-zero chirp, and ultrashort pulse width is realized.

Description

Chirp pulse stretching and compressing device and amplifying system

Technical Field

The application relates to the technical field of laser, in particular to a chirped pulse stretching and compressing device and an amplifying system.

Background

The femtosecond laser has the characteristics of high peak power and extremely short pulse width, can realize low-heat influence and high-quality precise micro-machining on metal and various brittle materials, and has wide application prospect in the industrial field along with the continuous development of process technology in recent years. The current commercial high-power femtosecond laser is generally realized by a Chirped Pulse Amplification (CPA) technology, and the basic structure and principle thereof are as follows: the femtosecond seed source generates an ultrashort pulse laser sequence with fixed repetition frequency, the ultrashort pulse laser sequence is stretched to dozens of picoseconds to several nanoseconds in a time domain through a pulse stretcher with larger second-order dispersion, then the frequency of the ultrashort pulse laser sequence is reduced by a pulse menu device or the output of a pulse string is realized, the average power and the single pulse energy are improved through a multistage power amplifier, and finally the ultrashort pulse output with femtosecond or picosecond magnitude is realized through the compensation dispersion of a pulse compressor.

However, in the pulse stretching-compressing scheme adopted by the current femtosecond pulse CPA laser, a Chirped Volume Bragg Grating (CVBG) is used as a stretcher/compressor, the CVBG is a Grating structure in which chirps are carved on a photorefractive crystal, and by using one CVBG as the stretcher and the compressor at the same time, seed light and amplified laser light are incident in opposite directions, so that dispersion processes experienced by the seed light and the amplified laser light in the CVBG are exactly opposite and can compensate each other.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to overcome the deficiencies in the prior art, and to provide a chirped pulse stretching compression device.

The present application provides:

a chirped pulse stretching compression device, comprising:

the first polarization beam splitter prism is provided with a first port, a second port, a third port and a fourth port;

the pulse stretching compressor is provided with a stretching port used for receiving optical pulses to be stretched and a compression port used for receiving the optical pulses to be compressed, which are arranged oppositely, and the stretching port is arranged on one side of the fourth port;

a dispersion adjuster provided at one side of the third port for providing group delay dispersion to the optical pulse emitted through the third port;

the seed pulse enters the first polarization beam splitter prism through the first port, then is emitted from the third port, enters the dispersion adjuster, then is reflected back along the original path, enters the first polarization beam splitter prism through the third port again, then is emitted into the pulse stretching compressor through the fourth port, and is emitted through the fourth port, the first polarization beam splitter prism and the second port in sequence after being subjected to time domain stretching in the pulse stretching compressor.

In addition, the chirped pulse stretching and compressing device according to the application can also have the following additional technical characteristics:

in some embodiments of the present application, the dispersion adjuster comprises:

a dispersive element, the dispersive element being one of a chirped grating pair, a chirped mirror group, or a prism pair;

a mirror disposed on a side of the dispersive element facing away from the third port.

In some embodiments of the present application, the chirped pulse stretching and compressing apparatus further includes an electrically controlled displacement stage, and when the dispersion element is a grating pair or a prism pair, the dispersion element is mounted on the electrically controlled displacement stage, and the electrically controlled displacement stage is configured to adjust a distance between two gratings in the grating pair or a distance between two prisms in the prism pair.

In some embodiments of the present application, the dispersive element is a chirped grating pair, two gratings of the grating pair being parallel to each other.

In some embodiments of the present application, the mirror redirects the incident light through a grating pair or a prism pair back to the third port.

In some embodiments of the present application, a first waveplate is disposed at the first port, a second waveplate is disposed between the third port and the dispersion adjuster, and a third waveplate is disposed between the fourth port and the broadening port.

In some embodiments of the present application, the first wave plate is a 1/2 wave plate, and the second wave plate and the third wave plate are both 1/4 wave plates.

In some embodiments of the present application, the chirped pulse stretching and compressing device further includes a second polarization beam splitter prism, the second polarization beam splitter prism has a fifth port, a sixth port and a seventh port, the sixth port and the seventh port are located on two opposite sides of the second polarization beam splitter prism, the sixth port is located corresponding to the compression port, a fourth waveplate is disposed between the compression port and the sixth port, and a fifth waveplate is disposed at the fifth port;

the amplified light beam enters from the compression entrance end, and the light beam which is emitted after passing through the fifth wave plate and the second polarization beam splitter prism is perpendicular to the incident light beam, enters the pulse stretching compressor from the sixth port, is compressed, passes through the fourth wave plate and the second polarization beam splitter prism again, and is emitted from the seventh port.

In some embodiments of the present application, the fourth wave plate is a 1/4 wave plate and the fifth wave plate is a 1/2 wave plate.

In some embodiments of the present application, the pulse stretching compressor is a chirped volume grating.

The present application further provides an amplification system comprising the chirped pulse stretching and compression apparatus according to any one of the above embodiments.

Compared with the prior art, the beneficial effects of this application are: the application provides a chirped pulse broadening compression device, through dispersion adjustment ware and first polarization beam splitter's setting, the seed pulse warp first port gets into follow behind the first polarization beam splitter the third port jets out, enters into extremely follow the primary reflection of route back the dispersion adjustment ware, passes through once more the third port gets into extremely follow behind the first polarization beam splitter fourth port jets into the pulse broadening compressor carry out the time domain broadening back in the pulse broadening compressor in proper order the fourth port first polarization beam splitter with the second port jets out. The application provides a stretch out compressor arrangement, with the current scheme contrast that uses single CVBG to regard as stretcher and compressor simultaneously, this application has overcome the unable shortcoming of compensating of additional chromatic dispersion in the unable regulation of chromatic dispersion, the amplification link for the optical pulse width of final output can reach femto second of ten heavenly stems magnitude, and can also adjust the pulse width according to the application end demand.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 illustrates a schematic diagram of a chirped pulse stretching compression apparatus in some embodiments of the present application;

FIG. 2 is a schematic diagram of a chirped pulse stretching compression device according to some embodiments of the present application, wherein the dispersive elements are transmissive grating pairs;

FIG. 3 is a schematic diagram illustrating a chirped pulse stretching compression device according to some embodiments of the present application, wherein the dispersive element is a reflective grating pair;

FIG. 4 is a schematic diagram illustrating one embodiment of a pulse stretching compressor in a chirped pulse stretching compression device according to some embodiments of the present application;

FIG. 5 shows a schematic view of an amplification system in some embodiments of the present application.

Description of the main element symbols:

100-chirped pulse stretching and compressing device; 110-a first polarization splitting prism; 111-a first port; 112-a second port; 113-a third port; 114-a fourth port; 120-a second polarization splitting prism; 121-a fifth port; 122-sixth port; 123-a seventh port; 130-a pulse stretching compressor; 131-widen the port; 132-a compression port; 140-a dispersion modifier; 141-a dispersive element; 1411-grating pair; 14111-grating; 142-a mirror; 150-a first wave plate; 151-a second waveplate; 152-a third wave plate; 153-fourth waveplate; 154-fifth wave plate; 200-an amplification system; 210-a preamplifier; 220-a frequency selector; 230-a multi-stage amplifier; 300-femtosecond seed source laser.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the related art, one CVBG is used as both a stretcher and a compressor, so that the seed light and the amplified laser light are incident in opposite directions, and the dispersion processes experienced by the seed light and the amplified laser light in the CVBG are opposite and can compensate each other. If the dispersion is applied to a high-power optical fiber femtosecond amplification system with a wave band of 1um, the dispersion of the material of the wavelength optical fiber is about 0.02ps ² And/m, assuming that the total length of the optical fiber link is 10m, and the spectral bandwidth of the laser is 10nm, the final output pulse width is about 3.5ps, while the width of the Fourier transform limited pulse is about 160fs, the pulse width is increased by nearly 20 times, and the peak power of the pulse is greatly reduced.

In order to solve the above problems, as shown in fig. 1 to 4, an embodiment of the present application provides a chirped pulse stretching and compressing apparatus 100, which is mainly disposed in an amplifying system 200 and implements stretching and compressing functions in a laser. The chirped pulse stretching compression device 100 comprises a first polarization splitting prism 110, a pulse stretching compressor 130 and a dispersion adjuster 140.

Referring to fig. 1, the first polarization splitting prism 110 has a first port 111, a second port 112, a third port 113, and a fourth port 114. Optionally, the first port 111 and the third port 113 are located on two opposite sides of the first polarization splitting prism 110, the second port 112 and the fourth port 114 are located on two opposite sides of the first polarization splitting prism 110, and meanwhile, none of the first port 111, the second port 112, the third port 113 and the fourth port 114 is on the same side of the first polarization splitting prism 110.

The pulse stretching compressor 130 has a stretching port 131 for receiving the optical pulse to be stretched and a compressing port 132 for receiving the optical pulse to be compressed, which are oppositely disposed, and the stretching port 131 is disposed on one side of the fourth port 114.

The dispersion adjuster 140 is disposed at one side of the third port 113, and is configured to provide group delay dispersion to the optical pulse emitted through the third port 113.

The seed pulse enters the first polarization splitting prism 110 through the first port 111, then is emitted from the third port 113, enters the dispersion adjuster 140, is reflected back along the original path, enters the first polarization splitting prism 110 through the third port 113 again, and then is emitted into the pulse stretching compressor 130 from the fourth port 114, after performing time domain stretching in the pulse stretching compressor 130, is sequentially emitted through the fourth port 114, the first polarization splitting prism 110, and the second port 112.

It should be noted that the seed pulse may be emitted from a femtosecond seed source laser 300, for example, an all-fiber mode-locked pulse fiber laser is selected, and a stable femtosecond laser pulse signal, i.e., a seed pulse, may be obtained. The arrow direction is the light path trend of the light pulse.

As shown in FIG. 2, assume a femtosecond seed source laserThe laser center wavelength of the femtosecond laser pulse signal emitted by the device 300 is 1030nm, the bandwidth is 10nm, the total length of the optical fiber amplification link is 10m, and then the dispersion of the material to be compensated is 0.2ps ² . If the Dispersion adjuster 140 uses a transmission grating pair with a grating constant of 1000l/mm, according to a Group Delay Dispersion (GDD) calculation formula of the transmission grating pair:

where N is the number of passes of the transmission grating pair, in this example N =2, m is the diffraction order, is-1, λ is the laser center wavelength, L is the vertical separation of the transmission grating pair, d is the grating period, c is the speed of light, θ is the speed of light _i At an angle of incidence, typically littrow, in this example θ _i Is 31 deg.. In the Chirped pulse stretching and compressing device 100, only 33mm of Grating pitch is needed to pre-compensate the dispersion of the amplification link, so that the optical path in the structure is very short, the light spot is small, the signal light power is low, a small-area diffraction Grating can be used, compared with a Chirped Fiber Bragg Grating (CFBG) adopted as a stretcher, the Chirped Fiber Bragg Grating (CFBG) has the advantages of lower cost, flexible adjustment, compact structure and higher reliability. In addition, in the high-power optical fiber amplification system 200, the dispersion adjuster 140 can also pre-compensate the nonlinear Phase shift caused by the nonlinear Phase Modulation (SPM) that may occur in the optical pulse amplification process to a certain extent, so as to adjust the dispersion and improve the quality of the output pulse.

Of course, in other embodiments, other values may be selected for the parameters in the above formula.

The application provides a chirped pulse stretching compression device 100, with the present scheme contrast that uses single CVBG to regard as stretcher and compressor simultaneously, this application has overcome the unable shortcoming of adjusting, the unable compensation of additional dispersion in the amplification link of dispersion for the pulse width of final output can reach femto second of ten heavenly degrees of magnitude, and can also adjust the pulse width according to the application end demand, can adapt different amplification system 200 in a flexible way, make output light pulse reach nearly zero chirp, realize ultrashort pulse width.

In some embodiments of the present application, optionally, the dispersion adjuster 140 comprises a dispersion element 141 and a mirror 142.

The dispersive element 141 is one of a grating pair 1411, a chirped mirror group, or a prism pair.

The grating pair 1411 may be a reflective grating (as shown in fig. 3) or a transmissive grating (as shown in fig. 2), where the diffraction angle of the diffraction grating is different for different wavelength components of the incident light, and the diffraction grating introduces angular dispersion, and the light has a gradually changing group delay within the spectral bandwidth of the light after passing through the grating pair 1411. Illustrated in fig. 2 as a reflective grating pair.

Because the chirped mirrors are spatially varied in the structure, light of different wavelengths enters the mirror structure at different depths, and thus have different group delays.

Of course, in other embodiments, the dispersion element 141 can also be selected as a prism pair for dispersion to achieve group delay dispersion.

A mirror 142 is arranged on a side of the dispersive element 141 facing away from the third port. Thus, the light beam entering the dispersion element 141 is reflected by the mirror 142 and returned to the third port 113 along the original path. The mirror 142 is preferably a total reflection mirror.

In some embodiments of the present application, optionally, the chirped pulse stretching and compressing apparatus 100 further includes an electrically controlled displacement stage, and when the dispersion element 141 is the grating pair 1411 or the prism pair, the dispersion element 141 is mounted on the electrically controlled displacement stage, and the electrically controlled displacement stage is configured to adjust a distance between two gratings 14111 in the grating pair 1411 or a distance between two prisms in the prism pair.

In this embodiment, by setting the electrically controlled displacement stage, the distance between the two gratings 14111 and the distance between the two prisms are used to realize the functions of online adjustment of the output pulse width.

In the above embodiment, as shown in fig. 2, specifically, the dispersive element 141 is a grating pair 1411, and two gratings 14111 in the grating pair 1411 are parallel to each other. Or the dispersive element 141 is a prism pair.

Specifically, incident light pulses with a certain spectral bandwidth undergo angular dispersion after being diffracted by a grating or refracted by a prism, light components with different wavelengths are separated in space, and are recombined in the same direction in space when going back and forth through the grating pair or the prism pair to exit, but because the light paths of the light pulses with different wavelength components are different, some light components are shorter than the front edge of the pulses, and some light components fall on the rear edge, so that the formed light pulses form chirp.

Of course, in other embodiments, the dispersive element 141 may also use a chirped mirror group.

As shown in fig. 1, in some embodiments of the present application, a first waveplate 150 is disposed at the first port 111, a second waveplate 151 is disposed between the third port 113 and the dispersion adjuster 140, and a third waveplate 152 is disposed between the fourth port 114 and the broadening port 131.

Specifically, the first wave plate 150 is a 1/2 wave plate, and the second wave plate 151 and the third wave plate 152 are both 1/4 wave plates.

In the present embodiment, for example, a linearly polarized light pulse enters the first port 111, passes through the 1/2 wave plate (first wave plate 150), is polarized in the P direction, enters the first polarization beam splitter prism 110, is transmitted, passes through the 1/4 wave plate (second wave plate 151), is changed into circularly polarized light, is diffracted by a pair of transmission gratings having the same parameter (grating period), forms a spatially dispersed broad elliptical light pulse, and is output, and is vertically incident on the mirror 142. The optical pulse is reflected by the mirror 142 and returned along the original path, and then is converted into S light having a polarization direction perpendicular to the incident time phase by the 1/4 wave plate (second wave plate 151) again, and is reflected when it enters the first polarization splitting prism 110 again, is converted into circularly polarized light by the other 1/4 wave plate (third wave plate 152), and then enters the CVBG in a direction in which the grating period is sparse-dense, and the long wave component of the optical pulse is reflected at a front position and the short wave component is reflected at a rear position. The optical pulse output by the optical pulse generating unit is amplified in the time domain with positive chirp, and passes through the first polarization splitting prism 110 again to be output from the fourth port 114, i.e., the amplified output end.

As shown in fig. 1, in some embodiments of the present application, the chirped pulse stretching compression device 100 further includes a second polarization beam splitter prism 120, the second polarization beam splitter prism 120 has a fifth port 121, a sixth port 122 and a seventh port 123, the sixth port 122 and the seventh port 123 are located on two opposite sides of the second polarization beam splitter prism 120, the sixth port 122 is disposed corresponding to the compression port 132, a fourth wave plate 153 is disposed between the compression port 132 and the sixth port 122, and a fifth wave plate 154 is disposed at the fifth port 121.

The amplified light beam enters from the compression entrance end, passes through the fifth wave plate 154, and has a polarization direction perpendicular to the transmission polarization direction of the second polarization splitting prism 120, so that the amplified light beam is reflected by the splitting surface of the second polarization splitting prism 120, and an outgoing light beam and an incoming light beam are perpendicular to each other, and enter the pulse spreading compressor 130 from the sixth port 122 through the fourth wave plate 153, are compressed, pass through the fourth wave plate 153 again, have the same polarization direction as the transmission polarization direction of the second polarization splitting prism 120, and exit from the seventh port 123.

Specifically, the fourth wave plate 153 is a 1/4 wave plate, and the fifth wave plate 154 is a 1/2 wave plate.

In this embodiment, the amplified laser light enters from the compression input end (i.e., the fifth port 121), passes through the 1/2 wave plate (the fifth wave plate 154), is polarized in the S direction, enters the second polarization splitting prism 120, is reflected, passes through the 1/4 wave plate (the fourth wave plate 153), becomes circularly polarized light, then enters the CVBG along the dense-sparse direction of the grating 14111, the positive chirp originally carried in the optical pulse reflected and output by the CVBG is compensated, is compressed in the time domain, again passes through the 1/4 wave plate (the fourth wave plate 153), becomes P polarized light, and finally is output through the seventh port 123 of the second polarization splitting prism 120, i.e., is output from the compression output end.

It is noted that when light is incident on the surface of the optical element, the coordinate system used is defined by the plane containing the incident and reflected beams, and that if the polarization vector of the light is in this plane, it is called P-light polarization, and if the polarization vector is perpendicular to this plane, it is called S-light polarization.

In the above-described embodiment of the present application, the pulse-stretching compressor 130 is a chirped volume grating, as shown in fig. 4. In the embodiment, the chirped volume grating is adopted, so that the structure is simple, the cost is reduced, and the volume/occupied area of a laser using the product is greatly reduced.

As shown in fig. 5, an embodiment of the present application further provides an amplification system 200 including the chirped pulse stretching compression apparatus 100 described in any one of the above embodiments.

Optionally, the amplification system 200 further comprises a preamplifier 210, a frequency selector 220 and a multistage amplifier 230. In this embodiment, the preamplifier 210 and the multistage amplifier 230 may be solid-state laser amplifiers using laser crystals, fiber amplifiers using doped gain fibers, or a mixture of both.

The frequency selector 220 may typically employ an acousto-optic modulator or an electro-optic modulator.

Specifically, the femtosecond laser pulse signal emitted from the femtosecond seed source laser 300 is amplified by the preamplifier 210, stretched to several tens of picoseconds to several nanoseconds by the chirped pulse stretching and compressing device 100, output from the stretching output end to the cascaded multi-stage amplifier 230, output from the amplifying system 200 after being fully amplified, enter the chirped pulse stretching and compressing device 100 again by the compression input end, and have the time domain pulse width compressed to the femtosecond order, and finally output from the compression output end.

The amplification system 200 provided in this embodiment includes the chirped pulse stretching and compressing apparatus 100 in any one of the embodiments, so that all the beneficial effects of the chirped pulse stretching and compressing apparatus 100 in any one of the embodiments are achieved, and details thereof are not repeated herein.

In summary, the present application provides a chirped pulse stretching and compressing apparatus 100, which, compared with the existing scheme that a single CVBG is used as both a stretcher and a compressor, overcomes the disadvantages that chromatic dispersion cannot be adjusted and additional chromatic dispersion in an amplification link cannot be compensated, so that the finally output pulse width can reach the femtosecond level, and the pulse width can be adjusted according to the requirement of an application end, flexibly adapt to different amplification systems 200, so that the output light pulse reaches near-zero chirp, and achieve an ultrashort pulse width.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims (11)

1. A chirped pulse stretching compression device, comprising:

the first polarization beam splitter prism is provided with a first port, a second port, a third port and a fourth port;

a pulse stretching compressor which is provided with a stretching port used for receiving optical pulses to be stretched and a compression port used for receiving optical pulses to be compressed, wherein the stretching port is arranged on one side of the fourth port;

a dispersion adjuster, disposed at one side of the third port, for providing group delay dispersion to the optical pulses emitted through the third port;

the seed pulse enters the first polarization beam splitter prism through the first port, then is emitted from the third port, enters the dispersion adjuster, is reflected back along the original path, enters the first polarization beam splitter prism through the third port again, then is emitted into the pulse stretching compressor through the fourth port, is subjected to time domain stretching in the pulse stretching compressor, and then is emitted through the fourth port, the first polarization beam splitter prism and the second port in sequence.

2. The chirped pulse stretching compression device according to claim 1, wherein the dispersion adjuster comprises:

a dispersive element, the dispersive element being one of a grating pair, a chirped mirror group, or a prism pair;

a mirror disposed on a side of the dispersive element facing away from the third port.

3. The chirped pulse stretching and compressing device according to claim 2, further comprising an electrically controlled displacement stage, wherein when the dispersion element is a grating pair or a prism pair, the dispersion element is mounted on the electrically controlled displacement stage, and the electrically controlled displacement stage is configured to adjust a distance between two gratings in the grating pair or a distance between two prisms in the prism pair.

4. The chirped pulse stretching compression device according to claim 2, wherein the dispersive element is a grating pair, and two gratings in the grating pair are parallel to each other.

5. The chirped pulse stretching compression device according to claim 2, wherein the reflecting mirror makes the incident light pass through the grating pair or the prism pair again and return to the third port along the original path.

6. The chirped pulse stretching compression device according to any one of claims 1 to 5, wherein a first waveplate is disposed at the first port, a second waveplate is disposed between the third port and the dispersion adjuster, and a third waveplate is disposed between the fourth port and the stretching port.

7. The chirped pulse stretching compression device according to claim 6, wherein the first wave plate is a 1/2 wave plate, and the second wave plate and the third wave plate are both 1/4 wave plates.

8. The chirped pulse stretching and compressing device according to claim 1, further comprising a second polarization beam splitter prism, wherein the second polarization beam splitter prism has a fifth port, a sixth port and a seventh port, the sixth port and the seventh port are located at two opposite sides of the second polarization beam splitter prism, the sixth port is disposed corresponding to the compression port, a fourth wave plate is disposed between the compression port and the sixth port, and a fifth wave plate is disposed at the fifth port;

the amplified light beam enters from the compression entrance end, and the light beam emitted after passing through the fifth wave plate and the second polarization beam splitter prism is perpendicular to the incident light beam, enters the pulse broadening compressor from the sixth port, is compressed, passes through the fourth wave plate and the second polarization beam splitter prism again, and is emitted from the seventh port.

9. The chirped pulse stretching compression device according to claim 8, wherein the fourth wave plate is a 1/4 wave plate, and the fifth wave plate is a 1/2 wave plate.

10. The chirped pulse stretching compression device according to claim 1, wherein the pulse stretching compressor is a chirped volume grating.

11. An amplification system comprising the chirped pulse stretching compression apparatus according to any one of claims 1 to 10.

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