CN112260048B - Device and method for periodically changing laser wavelength - Google Patents
Device and method for periodically changing laser wavelength Download PDFInfo
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- CN112260048B CN112260048B CN202011007156.4A CN202011007156A CN112260048B CN 112260048 B CN112260048 B CN 112260048B CN 202011007156 A CN202011007156 A CN 202011007156A CN 112260048 B CN112260048 B CN 112260048B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094076—Pulsed or modulated pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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Abstract
The invention belongs to the field of laser signal processing, and particularly discloses a device and a method for periodically changing laser wavelength. The device comprises a pulse laser source, a dispersion device, a collimation device, a time delay device, a convergence device and a reverse dispersion device, wherein the pulse laser source is used for emitting laser pulses; the dispersion device is used for changing the emitting directions of the lasers with different wavelengths in the laser pulses; the collimating device is used for collimating the lasers with different long emitting directions and different wavelengths into a group of parallel beams; the time delay device is used for carrying out time delay convergence on the laser in the parallel light beam and converging the delayed laser at the inverse dispersion device; the inverse dispersion device is arranged at the focus of the convergence device and is used for combining the lasers with different wavelengths and different emitting directions converged by the convergence device into a beam and emitting the beam. The invention can effectively inhibit the generation of phonons in the nonlinear effect, directly inhibit the nonlinear effect from the generation mechanism, and realize a high-quality seed source required by the amplification of a high-power fiber laser.
Description
Technical Field
The invention belongs to the field of laser signal processing, and particularly relates to a device and a method for periodically changing laser wavelength.
Background
To support technological development and economic growth, increasingly higher demands are being made on the brightness of laser systems in the fields of scientific research and industrial manufacturing. The optical fiber laser (including the optical fiber amplifier) has the advantages of good beam quality, compact structure, high electro-optic conversion efficiency and the like, and is widely applied to the field of high-brightness laser. However, in the case of high power, the single wavelength fiber laser is limited by the nonlinear effect, and it is difficult to further increase the brightness. Nonlinear effects in fiber lasers are generally suppressed by shortening the fiber length, enlarging the fiber, and designing special waveguide structures. However, these methods are limited by the physical properties of the fiber optic material, there are significant ceilings, and many of the techniques are still at the laboratory level due to their complexity.
Disclosure of Invention
In view of the above drawbacks or needs for improvement in the prior art, the present invention provides a device and a method for periodically changing the wavelength of a laser, in which a device for periodically changing the wavelength of a laser is designed in accordance with the characteristics of a laser wavelength signal and the characteristics of a periodic adjustment process thereof, and the structures and specific arrangement modes of key components thereof, such as a dispersion device, a collimation device, a time delay device, a convergence device, and a reverse dispersion device, are studied and designed. The laser beam after the wavelength is periodically changed is amplified, so that the nonlinear effect can be effectively overcome. And is thus particularly suitable for high power laser applications.
To achieve the above object, according to one aspect of the present invention, there is provided a laser wavelength periodic variation apparatus comprising: a pulsed laser source, a dispersive device, a collimating device, a time delay device, a converging device and an inverse dispersive device, wherein,
the pulse laser source is used for emitting laser pulses;
the dispersion device is used for changing the emitting directions of the lasers with different wavelengths in the laser pulses;
the collimating device is used for collimating the lasers with different long emitting directions and different wavelengths into a group of parallel beams;
the time delay device is used for delaying the lasers with different wavelengths and different positions in the parallel light beams so as to enable the parallel light beams to stagger laser pulses;
the converging device is used for converging the delayed laser at the inverse dispersion device;
the inverse dispersion device is arranged at the focus of the convergence device and is used for combining the lasers with different wavelengths and different emitting directions after being converged by the convergence device into a beam and emitting the beam.
It is further preferable that the pulsed laser source emits laser pulses in which a single pulse duration is not more than 5ns and a 3dB spectral width is not less than 0.1 nm.
More preferably, the dispersion device is any one of a prism, a reflective grating, a transmissive grating, and a volume bragg grating.
It is further preferred that said collimating means is a lens or a combination of lenses, the focal point of said lens or combination of lenses being located on said dispersing means.
It is further preferable that the minimum delay amount of the delay means is not less than the duration of a single pulse in a laser pulse emitted by the pulsed laser source.
More preferably, the time delay device is any one of a time delay optical fiber, a phase plate, a liquid crystal, and a one-dimensional ladder-type light transmitting medium.
It is further preferable that the converging means is a lens or a combination of lenses, the focal point of the lens or the combination of lenses is located on the inverse dispersion means, and the focal length of the converging means is equal to the focal length of the collimating means.
Further preferably, the inverse dispersion device is any one of a prism, a reflective grating, a transmissive grating, or a volume bragg grating, and a dispersion amount of the dispersion device is equal to a dispersion amount of the inverse dispersion device.
According to another aspect of the present invention, there is also provided a method for laser wavelength periodic variation adjustment, comprising the steps of:
s1, changing the emitting direction of the laser with different wavelengths in the emitted laser pulse;
s2, collimating the laser beams with different emergent directions and different wavelengths into a group of parallel beams;
s3, delaying the laser with different position and wavelength in the parallel beam to make the parallel beam stagger the laser pulse;
s4, changing the emitting directions of the delayed lasers with the same emitting direction, different positions and different wavelengths to make the parallel beams of the staggered laser pulses converge on one point;
s5 changes the emission directions of the laser beams having different wavelengths and different emission directions, which converge at one point, so that they are combined into one beam and emitted.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention uses a dispersion device to expand the collimated and parallel input broad spectrum pulse laser into a parallel light beam group, different wavelengths are positioned at different spatial positions, and corresponding time delay is applied to the light beams at different spatial positions, so that the sub-pulses with different wavelengths are periodically arranged on a time sequence when the parallel light beam group is compressed into a laser beam again. The shaped laser beam is amplified, and the nonlinear effect can be effectively overcome. Wherein, several typical nonlinear effect processes in the optical fiber, such as stimulated brillouin scattering effect and stimulated raman scattering effect, are all converted into a photon with a new frequency and a phonon, if the duration of the same wavelength laser pulse is shorter than the time required for generating a certain nonlinear effect phonon, the nonlinear effect can be effectively inhibited. The method comprises the steps of expanding different wavelength parts of a broad-spectrum pulse laser beam to different space positions through a dispersion element, controlling optical paths of a time delay device at different space positions according to a formula delta t-delta n-delta d/c to achieve the purpose of manufacturing beam transmission time delay, enabling the time delay obtained by the laser beams with different wavelengths to be different, and forming a beam of quasi-continuous or pulse laser beam with the laser wavelength periodically changing when the laser beams are coupled into a beam of laser beam again. As long as the pulse duration of the pulse laser used for shaping is sufficiently narrow at first, the shaped signal can effectively avoid the nonlinear effect during high-power amplification, and the peak power is reduced because the average power of the shaped beam is unchanged, which is more beneficial to realizing high-efficiency amplification by using continuous pump light during power amplification.
2. In the laser pulse emitted by the invention, the duration of a single pulse is not more than 5ns, the 3dB spectral width is not less than 0.1nm, the signal shaped by the laser pulse can effectively avoid the nonlinear effect during high-power amplification, and the peak power is reduced because the average power of the shaped beam is unchanged, thereby being more beneficial to realizing high-efficiency amplification by using continuous pump light during power amplification.
3. The time delay device is any one of a time delay optical fiber, a phase plate, a liquid crystal or a one-dimensional step-shaped light-transmitting medium, the time delay device is arranged into steps which are linearly arranged along a single axial direction and have different thicknesses, and the thickness of each step is determined according to the wavelength of different light beams so as to realize that the parallel light beams stagger laser pulses.
4. Compared with the prior art, the device and the method have the advantages of low cost, stable and reliable system, direct generation mechanism inhibition of nonlinear effect and realization of high-quality seed source required by high-power fiber laser amplification.
Drawings
FIG. 1 is a schematic structural diagram of a device for periodically changing the wavelength of laser light according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a laser wavelength periodic variation device according to another preferred embodiment of the present invention;
fig. 3 is a flow chart of the operation of a device for periodically changing the wavelength of laser according to the preferred embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-pulse laser source, 2-dispersion device, 3-collimation device, 4-time delay device, 5-convergence device and 6-inverse dispersion device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and fig. 2, a laser wavelength periodic variation apparatus provided by an embodiment of the present invention includes a pulsed laser source 1, a dispersion apparatus 2, a collimation apparatus 3, a time delay apparatus 4, a convergence apparatus 5, and an inverse dispersion apparatus 6, where the pulsed laser source 1 is configured to emit laser pulses; the dispersion device 2 is used for changing the emitting directions of the lasers with different wavelengths in the laser pulses; the collimating device 3 is used for collimating the lasers with different long emergent directions and different wavelengths into a group of parallel beams; the time delay device 4 is used for delaying the laser with different wavelengths at different positions in the parallel light beam so as to enable the parallel light beam to stagger the laser pulse; the converging device 5 is used for converging the delayed laser at the inverse dispersion device 6; the inverse dispersion device 6 is arranged at a focus of the convergence device 5, and is used for combining the lasers with different wavelengths and different emitting directions after being converged by the convergence device 5 into a beam and then emitting the beam.
It is further preferable that the pulsed laser source 1 emits laser pulses in which the duration of a single pulse is not more than 5ns and the 3dB spectral width is not less than 0.1 nm.
Preferably, the pulsed laser source 1 includes a fiber laser, an electro-optical intensity modulator, and a collimation output head, the electro-optical intensity modulator chops the laser output by the fiber laser in a time sequence to form a laser pulse with a period of 1ns and an output power of 3mw, the single pulse is a square wave and has a pulse width of 0.1ns, and the collimation output head is configured to collimate the laser pulse to a laser pulse with a spot diameter of 3mm and then output the laser pulse.
More preferably, the dispersion device 2 is any one of a prism, a reflective grating, a transmissive grating, and a volume bragg grating.
It is further preferred that the collimating means 3 is a lens or a combination of lenses, the focal point of which is located on the dispersive device 2.
It is further preferable that the minimum delay amount of the delay device 4 is not less than the duration of a single pulse in the laser pulse emitted by the pulsed laser source 1.
More preferably, the time delay device 4 is any one of a time delay optical fiber, a phase plate, a liquid crystal, or a one-dimensional step-type light transmitting medium.
It is further preferable that the converging means 5 is a lens or a combination of lenses, the focal point of the lens or the combination of lenses is located on the inverse dispersion means 6, and the focal length of the converging means 5 is equal to the focal length of the collimating means 3.
More preferably, the inverse dispersion device 6 is any one of a prism, a reflective grating, a transmissive grating, and a volume bragg grating, and the dispersion amount of the dispersion device 2 is equal to that of the inverse dispersion device 6.
The working process of the laser wavelength periodic variation device comprises the following steps:
(1) the dispersion device 2 is adopted to change the emitting directions of laser with different wavelengths in the laser pulse emitted by the pulse laser source 1.
Before that, the laser pulse emitted from the pulsed laser source 1 needs to be preprocessed, specifically: the pulse laser source (1) comprises a fiber laser, an electro-optic intensity modulator and a collimation output head, wherein the electro-optic intensity modulator chops laser output by the fiber laser into laser pulses with the period of 1ns and the output power of 3mw in a time sequence, a single pulse is a square wave and has the pulse width of 0.1ns, and the collimation output head is used for collimating the laser pulses into laser pulses with the spot diameter of 3mm and then outputting the laser pulses.
In this step, since a single laser pulse contains a plurality of lasers with different wavelengths, the emission directions of the lasers with different wavelengths are changed by using a prism, a reflective grating, a transmissive grating or a volume bragg grating.
(2) The laser beams with different emergent directions and different wavelengths are collimated into a group of parallel beams by adopting the collimating device 3. In the present invention, the collimating device 3 is an optical element for input and output of the optical fiber communication optical device, and its structure is simple-the divergent light from the optical fiber is changed into parallel light (gaussian light beam) by means of the similar convex lens placed in front of it. Its function is to couple the maximum efficiency of light into the desired device or to facilitate acceptance of the maximum efficiency of light signals, for example. It has an important parameter: the insertion loss can reach below 0.15dB by the process technology.
In particular, the collimating means 3 is a lens or a combination of lenses, the focal point of which is located on the dispersive device 2. More specifically, in the present invention, the collimating device 3 includes a first lens and a second lens, which are sequentially disposed, wherein the first lens is in a meniscus shape, the second lens is an aspheric lens, a meniscus concave surface of the first lens is an incident surface of light, a meniscus convex surface is an emergent surface of light, a focal point of the first lens is just located on the dispersing device 2, and the two lenses sequentially collimate the light beam, thereby effectively utilizing the edge light beam, improving the light transmission efficiency of the system, and making the collimated light beam have a smaller divergence angle.
In another embodiment of the present invention, the lens group of the collimating device 3 comprises three lenses, which are a first lens, a second lens and a third lens in sequence, wherein the first lens and the second lens are meniscus lenses, and the third lens is a plano-convex lens. The first lens and the second lens have a concave meniscus surface as an incident surface of light, a convex meniscus surface as an emergent surface of light, the third lens has a plano-convex surface as an incident surface of light, the convex surface of the plano-convex lens is an emergent surface of light, and the focus of the first lens is just positioned on the dispersion device 2.
(3) The time delay device 4 delays the laser with different wavelengths and different positions in the parallel light beam so as to enable the parallel light beam to stagger the laser pulse.
The time delay device is used for changing the optical path length of the laser passing through different positions to achieve the effects of time delay and pulse staggering. Specifically, the light beams emitted after passing through the collimating device 3 are sequentially arranged in a linear ladder manner according to different wavelengths, in the invention, the widths of different ladders in the ladder-shaped glass are set according to the focal length of the dispersion device 2, and further, the thickness of each ladder is determined according to the wavelengths of different light beams, so that the parallel light beams are staggered from laser pulses.
Meanwhile, in the present invention, the minimum delay amount of the delay device 4 is not less than the duration of a single pulse in the laser pulse emitted from the pulsed laser source 1. It can be any one of delay optical fiber, phase plate, liquid crystal or one-dimensional ladder type transparent medium. The length of the delay optical fiber is also determined according to the wavelength of different light beams, so that the parallel light beams stagger the laser pulse. The phase plate is formed by coating a film layer with certain thickness and refractive index on a local area (in one-dimensional step-type distribution) on a glass flat plate or a lens, so that the phase of light penetrating through the area is ahead or behind that of light passing through a non-coating area.
(4) The converging device 5 changes the emitting directions of the delayed laser beams with the same emitting direction, different positions and different wavelengths, so that the laser beams with different wavelengths and different positions passing through the converging device 5 are converged at the inverse dispersion device 6. In the present invention, the converging device 5 is a lens or a lens combination, the focal point of the lens or the lens combination is located on the inverse dispersion device 6, and the focal length of the converging device 6 is equal to the focal length of the collimating device 3. As a preferred embodiment of the present invention, the collimating means 3 of the converging means 6 are identical in structure and are symmetrically arranged with respect to the delaying means 4.
(5) The inverse dispersion device 6 is arranged at a focus of the convergence device 5, and combines the lasers with different wavelengths and different emitting directions converged by the convergence device 5 into one laser beam to be emitted. In the present invention, the inverse dispersion device 6 is any one of a prism, a reflection grating, a transmission grating, or a volume bragg grating, and the dispersion amount of the dispersion device 2 is equal to that of the inverse dispersion device 6.
Example 1
Referring to fig. 1, fig. 1 is an example of a device for periodically changing the wavelength of laser light. A continuous fiber laser with the output power of 100mW, the central wavelength of 1064nm, the 3dB line width of 2nm and the light beam quality close to the diffraction limit, an electro-optic intensity modulator and a collimation output head jointly form a pulse laser source. The electro-optical intensity modulator chops the output laser of the continuous fiber laser into a laser pulse sequence with the period of 1ns and the output power of 3mw (the laser is lost through the electro-optical intensity modulator) in a time sequence, and the single pulse is square wave in shape and 0.1ns in pulse width. The diameter of a laser pulse light spot finally output by the collimation output head is 3 mm. The laser pulse passes through a 1760 line transmission type grating and then passes through a lens combination to realize collimation output, the lens combination consists of a lens with the focal length of 10m and two high-reflectivity reflectors which are arranged in parallel, and the width of the collimated light beam along the y direction is about 35 mm. A piece of glass with the refractive index of 1.9 is used as a time delay device, the glass faces to the incident light direction and is a plane, the back incident light direction is a one-dimensional step plane distributed along the y direction, the thickness difference of the step planes between adjacent steps is 33.3mm, and the width of each step is 3 mm. The laser beam passing through the time delay device is converged by a lens combination which consists of a lens with the focal length of 10m and two high-reflectivity reflectors which are arranged in parallel. The converged laser passes through another transmission grating of 1760 lines and then is injected into a subsequent high-power optical fiber amplifier through an optical fiber coupling system to serve as seed laser. Through the adjustment of the laser wavelength periodic variation device, the seed laser in the high-power optical fiber amplifier forms a near-continuous laser with the wavelength continuously and periodically varying within the range of 2nm by taking 1ns as a period, so that phonons of the stimulated Brillouin scattering effect of a single spectrum section cannot be accumulated in high-power amplification, and the influence of the stimulated Brillouin scattering effect on the high-power narrow-linewidth laser amplification is thoroughly overcome. Through experimental comparison, the stimulated Brillouin scattering can reach the threshold value when the output power of the high-power optical fiber amplifier using the common narrow-linewidth seed source reaches 1.5kW, but the stimulated Brillouin scattering effect can not be observed when the output power of the same amplifier is 2.5kW due to the seed source adjusted by the laser wavelength periodic variation device, and the further improvement of the power is limited by the pumping power.
The embodiment shows that the invention can effectively realize the periodic change of the laser wavelength, is suitable for serving as a seed source of the high-power narrow-linewidth optical fiber amplifier, can effectively inhibit the stimulated Brillouin scattering effect and obtains high-power laser output.
According to another aspect of the present invention, as shown in fig. 3, there is provided a method for adjusting laser wavelength periodically, which is implemented by the above-mentioned apparatus, and comprises the following steps:
(1) changing the emitting directions of the laser with different wavelengths in the emitted laser pulses;
(2) collimating the laser beams with different emergent directions and different wavelengths into a group of parallel light beams;
(3) delaying lasers with different positions and wavelengths in the parallel light beams so as to enable the parallel light beams to stagger laser pulses;
(4) changing the emitting directions of the delayed lasers with the same emitting direction, different positions and different wavelengths to make the parallel beams of the staggered laser pulses converge at one point;
(5) the emitting directions of the laser beams with different wavelengths and different emitting directions converged at one point are changed, so that the laser beams are combined into one beam and then emitted.
In the invention, a dispersion device is used for expanding the collimated and parallel input broad-spectrum pulse laser into a parallel light beam group, different wavelengths are positioned at different spatial positions, and corresponding time delay is applied to light beams at different spatial positions, so that when the parallel light beam group is compressed into a laser beam again, sub-pulses with different wavelengths are periodically arranged on a time sequence. The shaped laser beam is amplified, and the nonlinear effect can be effectively overcome. When the laser beam shaped by the invention is used for high-power amplification, the generation of phonons in the nonlinear effect can be effectively inhibited, the nonlinear effect is directly inhibited from the generation mechanism, and a high-quality seed source required by the amplification of a high-power fiber laser can be realized. And is thus particularly suitable for high power laser applications.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A laser wavelength periodic variation device is characterized by comprising a pulse laser source (1), a dispersion device (2), a collimation device (3), a time delay device (4), a convergence device (5) and an inverse dispersion device (6),
the pulsed laser source (1) is used for emitting laser pulses;
the dispersion device (2) is used for changing the emitting directions of the laser with different wavelengths in the laser pulses;
the collimating device (3) is used for collimating the laser light with different emergent directions and different wavelengths into a group of parallel light beams;
the time delay device (4) is used for delaying the lasers with different positions and different wavelengths in the parallel light beam so that the parallel light beam staggers laser pulses, and the thickness of the dielectric layer of the time delay device (4) at different spatial positions is controlled according to a formula delta t delta n delta d/c to achieve the purpose of manufacturing the transmission time delay of the light beam, so that the time delays obtained by the lasers with different wavelengths are different, the time delay device (4) is a step shape which is sequentially linearly arranged along a single axial direction and has different thicknesses, and the thickness of each step is determined according to the wavelengths of the different light beams;
the converging device (5) is used for converging the delayed laser at the inverse dispersion device (6);
the inverse dispersion device (6) is arranged at the focus of the convergence device (5) and is used for synthesizing the lasers with different wavelengths and different emitting directions converged by the convergence device (5) into a laser beam and then emitting the laser beam, and when the laser beam is coupled into a laser beam, a quasi-continuous or pulse laser beam with periodically changed laser wavelength is formed.
2. A laser wavelength periodic variation device according to claim 1, characterized in that the pulse laser source (1) emits laser pulses with single pulse duration not more than 5ns and 3dB spectral width not less than 0.1 nm.
3. A laser wavelength periodic variation device according to claim 1, characterized in that the dispersion device (2) is any one of prism, reflective grating, transmissive grating or volume bragg grating.
4. A device for periodic variation of the wavelength of laser light according to claim 1, characterized in that the collimating means (3) is a lens or a combination of lenses, the focal point of which is located on the dispersive means (2).
5. A device for periodic variation of laser wavelength according to claim 1, characterized in that the time delay device (4) is any one of optical fiber for time delay, phase plate, liquid crystal or one-dimensional ladder type transparent medium.
6. A laser wavelength periodic variation device according to claim 1, characterized in that the converging means (5) is a lens or a combination of lenses, the focal point of the lens or the combination of lenses is located on the inverse dispersion device (6), and the focal length of the converging means (5) is equal to the focal length of the collimating means (3).
7. A laser wavelength periodic variation device according to claim 1, characterized in that the inverse dispersion device (6) is any one of prism, reflective grating, transmissive grating or volume bragg grating, and the dispersion amount of the dispersion device (2) is equal to that of the inverse dispersion device (6).
8. A method for adjusting laser wavelength with periodic variation, which is realized by the device according to any one of claims 1-7, and comprises the following steps:
s1, changing the emitting direction of the laser with different wavelengths in the emitted laser pulse;
s2, collimating the laser beams with different emergent directions and different wavelengths into a group of parallel beams;
s3, delaying the laser with different position and wavelength in the parallel beam to make the parallel beam stagger the laser pulse;
s4, changing the emitting directions of the delayed lasers with the same emitting direction, different positions and different wavelengths to make the parallel beams of the staggered laser pulses converge on one point;
s5 changes the emission directions of the laser beams having different wavelengths and different emission directions, which converge at one point, so that they are combined into one beam and emitted.
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