CN112600056B - Radial or angular polarized light laser device based on optical parameter chirped pulse amplification - Google Patents
Radial or angular polarized light laser device based on optical parameter chirped pulse amplification Download PDFInfo
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- CN112600056B CN112600056B CN202011384194.1A CN202011384194A CN112600056B CN 112600056 B CN112600056 B CN 112600056B CN 202011384194 A CN202011384194 A CN 202011384194A CN 112600056 B CN112600056 B CN 112600056B
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08054—Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation
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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A picosecond laser is used as a pumping source, radial or angular polarized light is used as a seed source, beam splitting sheets are respectively used for splitting the picosecond laser into two beams, the two beams are combined and then input into a nonlinear amplification crystal, and two beams of high-energy partial radial or angular polarized light are obtained. After two beams of high-energy partial radial or angular polarized light respectively pass through the compressor, one beam is combined with the other beam of high-energy non-uniform femtosecond radial or angular polarized light by using a beam combining mirror by utilizing a half-wave plate to rotate the polarization direction by 90 degrees. According to the invention, two paths of radial or angular polarized light are respectively amplified by the OPCPA and then combined, so that the amplification of the radial or angular polarized light can be effectively realized, the property characteristics of the radial or angular polarized light are well maintained, and a beam of high-energy femtosecond radial or angular polarized light is obtained. The invention can effectively solve the problem that the traditional OPCPA cannot be amplified due to the uneven polarization direction of the radial or angular polarized light, and realizes the laser output of the high-energy radial or angular polarized light.
Description
Technical Field
The invention relates to the technical field of ultrafast laser, in particular to a radial or angular polarized light laser device based on optical parametric chirped pulse amplification.
Background
The radial or angular polarized light is spatially non-uniform polarized light, the polarization states of the light beams at different positions are different, the polarization state distribution of the cross section of the light beam is in axisymmetric or annular distribution, the amplitude of an electric field at the center position is zero due to the phase singularity at the center of the light spot, and the intensity of the light spot is in hollow annular distribution. Due to the unique polarization and intensity distribution characteristics of the radial or angular polarized light, the method brings a plurality of potential application values, including the fields of particle capture, high-precision metal material processing, super-resolution microscopy, surface plasma excitation, laser acceleration and the like, and has great application potential values.
The high-energy femtosecond radial or angular polarized light has very wide prospect in the field of strong field physics, and a strong longitudinal electric field is formed after the strong focusing of a radial or angular polarized light large numerical aperture focusing system, so that the acceleration of electrons can be directly realized, the classical diffraction limit of a traditional coherent light field can be broken through, and a smaller focusing light spot size and higher energy density can be obtained. Meanwhile, electrons are trapped in the center of a focusing light spot by a transverse electric field of radial or angular polarized light, so that the divergence angle of the monoenergetic electron beam is compressed while the electron density is improved. Therefore, the high-energy femtosecond radial or angular polarized light laser system has very wide research prospect.
However, different spatial positions of the radially or angularly polarized light have different polarization states, and a conventional Optical Parametric Chirped Pulse Amplification (OPCPA) laser system is limited by requirements of gratings for laser polarization, phase matching requirements of an amplification crystal and the like, and cannot completely amplify the radially or angularly polarized light, so that the quality of output radially or angularly polarized laser light is very poor.
Therefore, the method of amplifying and combining two paths is adopted, and the method of amplifying in two paths and then coherently combining the beams is adopted to generate high-energy femtosecond radial or angular polarized light, which is an important method for solving the problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a radial or angular polarized light laser device based on optical parametric chirped pulse amplification, and the technical scheme of the invention is as follows:
a radial or angular polarized light laser device based on optical parametric chirped pulse amplification is characterized in that: the device comprises a femtosecond laser seed source, a stretcher, a wavelength conversion device, a picosecond laser, a vortex wave plate, a signal light beam splitting plate, a pump light beam splitting plate, a dichroic mirror, a nonlinear crystal, a compressor, a delayer, a half-wave plate and a beam combining mirror;
the femtosecond laser seed source generates femtosecond seed light, and the femtosecond seed light forms picosecond seed light after the time domain of the stretcher is stretched; the picosecond seed light is converted into radial or angular polarized seed light through a vortex wave plate;
the femtosecond laser seed source generates femtosecond seed light, and the femtosecond seed light is injected into the picosecond laser through the wavelength conversion device to form picosecond pump light;
the radial or angular polarized seed light is divided into two same beams by the signal light beam splitter, the picosecond pump light is divided into two same beams by the pump light splitter, the two paths of radial or angular polarized seed light and the picosecond pump light are respectively incident into the nonlinear crystal in a collinear way by utilizing the dichroic mirror, and after amplification, two beams of same high-energy partial radial or angular polarized light are obtained;
compressing the two beams of high-energy partially radial or angular polarized light by a compressor to form two beams of high-energy femtosecond partially radial or angular polarized light, wherein one beam is combined with the other beam by a beam combining mirror after rotating the polarization direction by 90 degrees by using a half-wave plate, so that one beam of high-energy femtosecond radially or angular polarized light is obtained; the time domain coincidence between the two beams of high-energy femtosecond partial radial or angular polarized light is adjusted by a time delay device.
The stretcher is used for stretching the pulse width to the picosecond magnitude.
The compressor is used for compressing the pulse width to the femtosecond order.
The stretcher is a positive dispersion stretcher, and the dispersion amount introduced by the stretcher can be adjusted by adjusting the position of the grating.
The radial or angular polarized seed light and the picosecond pump light need to be collinearly incident into the nonlinear crystal and are overlapped on a time domain; the inclination angle of the nonlinear crystal is adjusted to meet the phase matching condition, and idle light and pump light passing through the nonlinear crystal can be filtered by a dichroic mirror.
The compressor is a negative dispersion compressor, is conjugated with the stretcher, and adjusts the dispersion amount by adjusting the distance between the gratings.
Compared with the prior art, the invention has the advantages that:
1. the invention can effectively solve the problem that the traditional OPCPA cannot be amplified due to the uneven polarization direction of radial or angular polarized light.
2. The invention can effectively realize the output of high-energy radial or angular polarized light laser.
3. The invention adopts OPCPA combined beam, and has the advantages of no thermal effect, tunable wavelength, high pulse contrast and the like.
Drawings
Fig. 1 is a schematic diagram of an optical path of a radial or angular polarized light laser device based on optical parametric chirped pulse amplification.
Fig. 2 is a schematic diagram of the synthesis of the femtosecond portion radial polarized light after double-path amplification.
FIG. 3 is a schematic diagram of the synthesis of dual-path amplified angularly polarized light of a femtosecond portion.
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.
As shown in fig. 1, the radial or angular polarized light laser device based on optical parametric chirped pulse amplification of the present invention includes a femtosecond laser seed source 1, a stretcher 2, a wavelength conversion device 3, a high-energy picosecond laser 4, a vortex wave plate 5, a signal light beam splitter 6, a pump light beam splitter 7, a pump light dichroic mirror 8, a first nonlinear amplification crystal 9, a compressor 10, a delay 11, a half-wave plate 12, and a beam combiner 13.
The femtosecond laser seed source 1 generates a beam of high-energy femtosecond seed light; after the femtosecond seed light passes through the stretcher 2, the pulse width is stretched to picosecond magnitude to obtain a beam of picosecond seed light; the picosecond seed light is converted into radial or angular polarized seed light through the vortex wave plate 5; the picosecond pump light is generated by a high-energy picosecond laser 4, and the seed source is injected after being converted into the pump wavelength by the femtosecond laser seed source 1 through the wavelength conversion device 3.
The radial or angular polarization seed light is divided into two identical beams by a signal light beam splitter 6, and the picosecond pump light is divided into two identical beams by a pump light splitter 7; the two beams of radial or angular polarized seed light and the picosecond pump light are respectively incident into the nonlinear amplification crystal 9 in a collinear way by utilizing the dichroic mirror 8, and after amplification, two beams of same high-energy partial radial or angular polarized light are obtained.
After passing through the compressor 10, the two beams of high-energy partially radial or angular polarized light are pulse-width compressed to femtosecond level, and two beams of high-energy femtosecond partially radial or angular polarized light are obtained.
After one beam of the high-energy femtosecond partial radial or angular polarized light rotates the polarization direction by 90 degrees by using a half-wave plate 12, the high-energy femtosecond partial radial or angular polarized light and the other beam of the high-energy femtosecond partial radial or angular polarized light are combined by using a beam combining mirror 13, so that one beam of the high-energy femtosecond radial or angular polarized light is obtained; the time domain coincidence between the two beams of high-energy femtosecond partial radial or angular polarized light is adjusted by the delayer 11.
One specific example is as follows.
The femtosecond seed light output by a sapphire laser passes through a 4-micron optical parametric pulse amplifier to output single-pulse energy of 100 microjoules and high-energy femtosecond seed light with the central wavelength of 4 microns, and the central wavelength can be tuned between 1 and 5 microns by adjusting the angle of a crystal in the optical parametric pulse amplifier or replacing the crystal material. The femtosecond seed light output from the optical parametric pulse amplifier passes through one
After the stretcher, the chirped seed light was stretched, corresponding to a pulse width of about 70 ps. The stretched chirped seed light passes through a vortex wave plate to generate radial or angular polarized seed light with the topological charge number of 1, and the topological charge number can be changedDifferent values of m. After passing through a beam splitter of 50:50, the radial or angular polarized seed light is split into two beams of identical radial or angular polarized seed light.
The Nd-YAG laser utilizes a Ti sapphire laser to inject as seed light, so as to control the synchronization of pulses emitted by the two lasers on a time domain, and the Nd-YAG laser outputs picosecond pump light with 200 mJ energy, the central wavelength of the picosecond pump light is 1064 nanometers, the pulse width of the picosecond pump light is 70 picoseconds, and the repetition frequency of the laser light is 20 Hz. The picosecond pump light is divided into two beams of same pump light through a 50:50 beam splitting sheet, the same pump light is spatially overlapped with the two beams of radial or angular polarized seed light through two dichroic mirrors, the two beams of radial or angular polarized seed light are incident to two KTA crystals together, the cutting angles of the crystals are 40.8 degrees, and the thickness of the crystals is 10 mm. However, because the polarization directions of the radial or angular polarized light are spatially non-uniform, when amplification is performed in a certain polarization direction under the phase matching condition, complete amplification cannot be performed in other polarization directions, and only the polarization component part meeting the phase matching condition can be amplified, so that the intensity of the emitted pulse is non-uniform. Meanwhile, two beams of picosecond radial or angular polarized light obtained after amplification respectively enter the two grating pair compressors, and the spatial intensity nonuniformity of the amplified radial or angular polarized light can be aggravated due to the fact that the diffraction efficiency of the gratings is influenced by the polarization of the pulses. Therefore, two beams of high-energy femtosecond partial radial or angular polarized light with different light intensities at the upper side, the lower side and the left side can be obtained after passing through the OPCPA, and one beam of high-energy femtosecond partial radial or angular polarized light rotates the polarization direction by 90 degrees after passing through a half-wave plate.
Fig. 2 and 3 show schematic diagrams of two amplified beams of radially and angularly polarized light combined in the high energy femtosecond portions, with arrows indicating the polarization directions. Because two paths of systems of the OPCPA part are completely the same, parameters such as pulse width, energy, spectrum and the like of two amplified light pulses are completely the same except that the polarization direction difference is 90 degrees, so that a beam of complete high-energy femtosecond radial or angular polarized light with uniform intensity and polarization direction can be generated after synthesis, and the topological charge number is still kept to be 1. The time domain coincidence in the beam combination process is controlled by a delayer. Finally, 4 micron radially or angularly polarized light at milli-focal levels with hundred femtosecond pulse widths can be output.
The results show that by amplifying the two paths of radial or angular polarized light respectively by using the OPCPA and then combining the beams, the amplification of the radial or angular polarized light can be effectively realized, the property characteristics of the radial or angular polarized light are well maintained, and a beam of high-energy femtosecond radial or angular polarized light is obtained.
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 (6)
1. A radial or angular polarized light laser device based on optical parametric chirped pulse amplification is characterized in that: the device comprises a femtosecond laser seed source, a stretcher, a wavelength conversion device, a picosecond laser, a vortex wave plate, a signal light beam splitting plate, a pump light beam splitting plate, a dichroic mirror, a nonlinear crystal, a compressor, a delayer, a half-wave plate and a beam combining mirror;
the femtosecond laser seed source generates femtosecond seed light, and the femtosecond seed light forms picosecond seed light after the time domain of the stretcher is stretched; the picosecond seed light is converted into radial or angular polarized seed light through a vortex wave plate;
the femtosecond laser seed source generates femtosecond seed light, and the femtosecond seed light is injected into the picosecond laser through the wavelength conversion device to form picosecond pump light;
the radial or angular polarized seed light is divided into two same beams by the signal light beam splitter, the picosecond pump light is divided into two same beams by the pump light splitter, the two paths of radial or angular polarized seed light and the picosecond pump light are respectively incident into the nonlinear crystal in a collinear way by utilizing the dichroic mirror, and after amplification, two beams of same high-energy partial radial or angular polarized light are obtained;
compressing the two beams of high-energy partially radial or angular polarized light by a compressor to form two beams of high-energy femtosecond partially radial or angular polarized light, wherein one beam is combined with the other beam by a beam combining mirror after rotating the polarization direction by 90 degrees by using a half-wave plate, so that one beam of high-energy femtosecond radially or angular polarized light is obtained; the time domain coincidence between the two beams of high-energy femtosecond partial radial or angular polarized light is adjusted by a time delay device.
2. The laser device of claim 1, wherein the laser device comprises: the stretcher is used for stretching the pulse width to the picosecond magnitude.
3. The laser device of claim 1, wherein the laser device comprises: the compressor is used for compressing the pulse width to the femtosecond order.
4. A laser device of radially or angularly polarized light based on optical parametric chirped pulse amplification according to claim 1 or 2, characterized in that: the stretcher is a positive dispersion stretcher, and the dispersion amount introduced by the stretcher can be adjusted by adjusting the position of the grating.
5. The laser device of claim 1, wherein the laser device comprises: the radial or angular polarized seed light and the picosecond pump light need to be collinearly incident into the nonlinear crystal and are overlapped on a time domain; the inclination angle of the nonlinear crystal is adjusted to meet the phase matching condition, and idle light and pump light passing through the nonlinear crystal can be filtered by a dichroic mirror.
6. A laser device of radially or angularly polarized light based on optical parametric chirped pulse amplification according to claim 1 or 3, characterized in that: the compressor is a negative dispersion compressor, is conjugated with the stretcher, and adjusts the dispersion amount by adjusting the distance between the gratings.
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