CN117559198A - Gas type ultrashort pulse laser compression system and compression method thereof - Google Patents
Gas type ultrashort pulse laser compression system and compression method thereof Download PDFInfo
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052743 krypton Inorganic materials 0.000 claims description 2
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052754 neon Inorganic materials 0.000 claims description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 2
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Classifications
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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
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/115—Q-switching using intracavity electro-optic devices
Abstract
The invention provides a gas type ultrashort pulse laser compression system and a compression method thereof, which belong to the technical field of laser, wherein the system comprises an electro-optical oscillator, a second polarizer (7), an electro-optical crystal switch (8), a quarter wave plate (9), a first concave reflecting mirror (10), a reflecting mirror (11) and a second concave reflecting mirror (13), and laser is enabled to reciprocate in the electro-optical oscillator through setting the voltage at two ends of the electro-optical crystal switch (8) and repeatedly pass through a rare gas pipe (12), so that the purpose of compressing the laser is achieved.
Description
Technical Field
The invention relates to a gas type ultrashort pulse laser compression system and a compression method thereof, and belongs to the technical field of lasers.
Background
Ultrashort pulse laser has the outstanding characteristics of narrow pulse width, high peak power and the like, is widely applied to a plurality of fields such as basic scientific research of physics, chemistry and the like, micro-nano processing, life medicine, information communication and the like, and provides a powerful tool for the development of the fields. With the development of intensive research and application, ultra-short pulse lasers are required to have higher peak power, and obtaining narrower pulse widths is the most effective way to increase peak power. The narrower pulse width is obtained by compression, which becomes a problem to be solved in the development of the ultra-short pulse laser technology.
The pulse width of ultrashort pulse laser is inversely proportional to the laser spectral width, i.e., a narrower pulse width is obtained, requiring a wider laser spectral width to be produced. The gain material of the ultra-short pulse laser is limited by the energy level structure and the fluorescence spectrum, and the laser spectrum width has an upper limit. Obtaining a wider laser spectrum width requires widening the spectrum of the ultra-short pulse laser by new technical means.
Nonlinear compression techniques are one method of obtaining narrower pulse width lasers that have emerged in recent years. The ultra-short pulse laser passes through a gas or solid medium with a certain peak power density, the nonlinear effect of the medium self-phase modulation is utilized to realize the broadening of the laser spectrum so as to obtain a new spectrum component, and then a negative dispersion device is utilized to compensate the dispersion introduced by the broadening medium, so that the narrower laser pulse width is obtained in a compressed time domain scale.
Disclosure of Invention
In view of the above, the invention provides an ultrashort pulse laser compression system and a compression method thereof for high peak power, which can meet the requirements of laser applicable to high peak power, and has the advantages of small system volume, good replicability and capability of more conveniently obtaining laser with narrower pulse width.
A gas-type ultrashort pulse laser compression system, comprising: a light source (1), a lens group (2), a first half wave plate (3), a first polarizer (4), a magnetic gyrator (5), a second half wave plate (6), an electro-optical oscillator, a rare gas tube (12) and a negative dispersion compensator (14);
the lens group (2), the first half-wave plate (3), the first polarizer (4), the magnetic gyrator (5), the second half-wave plate (6) and the electro-optical oscillator are sequentially arranged on a light path of the light source (1), ultra-short pulse laser emitted by the light source (1) is received, the negative dispersion compensator (14) is arranged on a reflection light path of the first polarizer (4), the laser reflected by the first polarizer (4) is received, and the rare gas tube (12) is arranged in the electro-optical oscillator;
a light source (1) for emitting ultra-short pulse laser light;
a lens group (2) for adjusting the aperture of the laser beam;
the first half-wave plate (3) and the second half-wave plate (6) rotate the polarization direction of laser;
a first polarizer (4) that transmits laser light in a horizontal polarization direction and reflects laser light in a vertical polarization direction;
a magneto-rotator (5) for rotating the polarization direction of the laser light by 45 DEG;
an electro-optical oscillator for controlling the laser to reciprocate in the electro-optical oscillator;
a rare gas tube (12) for providing a rare gas environment;
a negative dispersion compensator (14) for providing negative dispersion to the laser light and compensating for the dispersion introduced by the rare gas tube (12).
Further, the electro-optical oscillator includes: a second polarizer (7), an electro-optical crystal switch (8), a quarter-wave plate (9), a first concave reflecting mirror (10), a reflecting mirror (11) and a second concave reflecting mirror (13);
the second polarizer (4), the electro-optical crystal switch (8), the quarter wave plate (9) and the first concave reflecting mirror (10) are sequentially arranged on a light path of laser transmitted by the second half wave plate (6), the transmitted light of the first polarizer (4) is received, the reflecting mirror (11) is arranged on a reflecting light path of the second polarizer (7), the rare gas tube (12) is arranged between the reflecting mirror (11) and the second concave reflecting mirror (13), and the rare gas tube (12) and the second concave reflecting mirror (13) are sequentially arranged on a reflecting light path of the reflecting mirror (11);
a second polarizer (7) that transmits laser light in a horizontal polarization direction and reflects laser light in a vertical polarization direction;
an electro-optical crystal switch (8) for providing a phase delay for the transmitted laser light in accordance with the applied voltage;
a quarter wave plate (9) providing a quarter phase retardation for the transmitted laser light;
a first concave mirror (10), a second concave mirror (13) and a mirror (11) for reflecting laser light.
Further, the lens group (2) is composed of at least one transparent concave-convex lens, and a laser antireflection film is plated on the surface of the concave-convex lens.
Further, the rare gas tube (12) includes: the gas pipe body (12-1), the window sheet (12-2) and the inflation and deflation port (12-3), wherein the window sheet (12-2) is sealed at two sides of the gas pipe body (12-1) to form a sealed space, and the inflation and deflation port (12-3) is arranged at the side end of the gas pipe body (12-1);
a gas pipe body (12-1) for storing helium, neon, argon or krypton;
a window sheet (12-2) coated with a laser antireflection film system for transmitting laser;
and an inflation/deflation port (12-3) for inflating and deflating the gas pipe body (12-1).
A gas type ultrashort pulse laser compression method comprises the following steps:
setting the polarization direction of a first half wave plate (3), enabling the polarization direction of laser light after the light source (1) emits input laser light to pass through the first half wave plate (3) to be changed into a horizontal polarization direction, enabling the polarization direction of the laser light to rotate 45 degrees through a magnetic rotator (5), adjusting a second half wave plate (6) to enable the polarization direction of the laser light transmitted by the magnetic rotator (5) to rotate 45 degrees to the horizontal polarization direction, and enabling the laser light to be emitted to a second polarizer (7);
the second step, the laser is transmitted to the electro-optical crystal switch (8) through the second polarizer (7), the electro-optical crystal switch (8) is not loaded with voltage, the laser is transmitted to the first concave reflector (10) after sequentially transmitting through the electro-optical crystal switch (8) and the quarter wave plate (9), the laser is transmitted to the second polarizer (7) after being reflected and sequentially transmitted to the quarter wave plate (9) and the electro-optical crystal switch (8), the laser is reflected to the reflector (11) by the second polarizer (7), and the laser is reflected to the rare gas tube (12) by the reflector (11);
and thirdly, transmitting laser to a second concave reflecting mirror (13) by a rare gas pipe (12), reflecting the laser by the second concave reflecting mirror (13), transmitting the laser to a second polarizer (7) by a reflecting mirror (11) after transmitting the laser through the rare gas pipe (12), reflecting the laser to an electro-optical crystal switch (8) by the second polarizer (7), setting the on time T of the electro-optical crystal switch (8), loading a quarter wave voltage, then reciprocating the laser in an electro-optical oscillator to the electro-optical crystal switch (8) to be turned off, outputting the laser to a first polarizer (4), reflecting the laser by the first polarizer (4), and then outputting the laser from a negative dispersion compensator (14).
Further, the on-time of the electro-optical crystal switch (8) is obtained by calculation as follows:
wherein L is the optical path length of the electro-optical oscillator, c is the light velocity, N is the round trip frequency of light in the electro-optical oscillator, and is a set value.
The beneficial effects are that:
in the first and second invention, the second polarizer, the electro-optical crystal switch, the quarter wave plate, the first concave reflector, the reflector and the second concave reflector form an electro-optical oscillator structure, the structure is a space light path structure, pulse laser is repeatedly transmitted and received in the structure, nonlinear effective acting distance between the pulse laser and rare gas is increased, space volume can be greatly compressed, compactness and stability of the system are improved, and the reflector of the structure only needs to complete basic reflection function, and can not need an oversized reflector surface size, so that processing difficulty and processing cost of an optical lens are reduced.
In the second aspect, compared with a method for widening the ultra-short pulse laser spectrum by adopting a solid material as a nonlinear medium, the method provided by the invention adopts rare gas as the nonlinear medium, so that the widening of higher laser single pulse energy and laser peak power can be completed by utilizing a higher damage threshold value of the rare gas, and meanwhile, the volume of a rare gas tube phase is smaller, so that the problems of high sealing difficulty and high manufacturing cost caused by overlarge volume of a traditional inflation gas chamber are avoided.
Compared with the prior art, the method can change the round trip times of the laser in the electro-optical oscillator by controlling the loading voltage of the electro-optical switch, thereby changing the transmission time of the pulse laser in the electro-optical oscillator and the nonlinear acting distance of rare gas, and further flexibly adjusting the spectrum broadening effect of the ultra-short pulse laser. The starting time of the electro-optical crystal switch is calculated and obtained through a formula, wherein N is a set value and is generally 50-100 times, the time range is determined according to the optical path length of the electro-optical oscillator, the round trip times in the electro-optical oscillator and the light speed, and as a result, the obtained starting time is calculated and obtained through the formula, so that the spectrum width of the electro-optical oscillator can be widened to the target width, the widening precision is higher, and the effect is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the composition of a gas-type ultrashort pulse laser compressor according to the present invention.
FIG. 2 is a schematic view of a rare gas tube according to the present invention.
The device comprises a 1-light source, a 2-lens group, a 3-first half wave plate, a 4-first polarizer, a 5-magnetic rotator, a 6-second half wave plate, a 7-second polarizer, an 8-electro-optic crystal light-on, a 9-quarter wave plate, a 10-first concave mirror, a 11-mirror, a 12-rare gas pipe, a 12-1 gas pipe body, a 12-2 window plate, a 12-3 inflation/deflation port, a 13-second concave mirror and a 14-negative dispersion compensator.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides an ultrashort pulse laser compression system and a compression method thereof for high peak power, which can meet the technical scheme that the system is applicable to high peak power laser, has smaller system volume and good replicability, and can more conveniently obtain narrower pulse width laser.
As shown in fig. 1, this embodiment provides a gas-type ultrashort pulse laser compression system, which includes: the ultra-short pulse laser light source (1), the lens group (2), the first half-wave plate (3), the first polarizer (4), the magnetic gyrator (5), the second half-wave plate (6), the electro-optic oscillator, the rare gas tube (12) and the negative dispersion compensator (14) are sequentially arranged on a light path of laser emitted by the light source, the second half-wave plate (6) and the electro-optic oscillator, the negative dispersion compensator (14) is arranged on a reflection light path of the first polarizer (4), and the rare gas tube (12) is arranged in the electro-optic oscillator;
the ultra-short pulse laser light source (1) is a light source for emitting ultra-short pulse laser, the pulse width ranges from femtosecond to picosecond, and the wavelength ranges from ultraviolet to mid-infrared spectrum.
The lens group (2) is composed of one or more concave-convex lenses, and is plated with a laser antireflection film, so that the beam caliber of laser is adjusted to be matched with the mode field area of the electro-optical oscillator, and the laser energy density is ensured to be smaller than the damage threshold value of an optical device.
The first half wave plate (3) is a laser polarization adjusting device for adjusting the polarization direction of laser light to the horizontal polarization direction.
The first polarizer (4) transmits the input laser light in the horizontal polarization direction and reflects the output laser light in the vertical polarization direction.
The magnetic rotator (5) rotates the polarization direction of the transmitted laser light by 45 degrees, and the magneto-optical isolation of the input laser light and the output laser light is realized by combining the first polarizer (4) and the second half-wave plate (6).
The second half wave plate (6) is a laser polarization adjustment device, and rotates the polarization direction of the transmitted laser light by 45 degrees.
The rare gas tube (12) is filled with a rare gas as a nonlinear medium. The rare gas pipe (12) is a gas sealing device and consists of a gas pipe body (12-1), a window sheet (12-2) and an inflation and deflation port (12-3), as shown in figure 2. The gas pipe body (12-1) is a main body which is supported and fixed and sealed by gas. The window sheet (12-2) is plated with a laser antireflection film system, and laser is transmitted into the rare gas tube (12) through the window sheet. The inflation and deflation port (12-3) is connected with a rare gas bottle, and can be inflated, deflated and adjust the air pressure.
The second polarizer (7), the electro-optical crystal switch (8), the quarter-wave plate (9), the first concave reflecting mirror (10), the reflecting mirror (11) and the second concave reflecting mirror (13) form an electro-optical oscillator. The pulse laser light passes through the rare gas tube 12 a plurality of times by reciprocating in the electro-optical oscillator a plurality of times. The first concave mirror (10) and the second concave mirror (13) have a focusing function to focus the pulsed laser light into the rare gas tube (12).
The second polarizer (7) transmits laser light in the horizontal polarization direction and reflects laser light in the vertical polarization direction.
The electro-optical crystal switch (8) provides a quarter wave phase delay when loaded with a quarter wave high voltage.
The quarter wave plate (9) provides a phase retardation of the quarter wave.
The first concave mirror (10) is a concave mirror and reflects laser light at zero degrees.
The reflecting mirror (11) reflects the laser light at 45 degrees.
The second concave reflecting mirror (13) is a concave mirror and reflects laser light in a zero degree mode.
The negative dispersion compensation device (14) provides negative dispersion to the pulse laser, and the specific implementation forms can be a grating pair, a prism pair or a plurality of negative dispersion mirrors and the like. The negative dispersion compensation device (14) compensates positive chirp introduced by material dispersion and self-phase modulation nonlinear effect of the electro-optical oscillator, so as to compress the time domain scale of pulse laser and obtain narrower laser pulse width;
by controlling the voltage time of the electro-optic crystal switch (8), the electro-optic oscillator operates in three phases: injection phase, oscillation phase, output phase.
1) Injection stage: the laser light in the horizontal polarization direction passing through the second half-wave plate (6) is transmitted through the second polarizer (7). When laser transmits through the electro-optical crystal switch (8), the electro-optical crystal switch (8) is not loaded with high voltage, and no phase delay is introduced. The laser light is transmitted through the quarter wave plate (9) and introduces a phase retardation of the quarter wave. The first concave mirror (10) reflects the laser light at zero degrees. The laser light is transmitted again through the quarter wave plate (9) introducing a phase retardation of the quarter wave. The phase delay of the half wave adjusts the polarization direction of the laser light to the vertical direction. The second polarizer (7) reflects the laser light in the perpendicular polarization direction. The mirror (11) reflects the laser light at an incident angle of 45 degrees. The laser light is transmitted through the rare gas tube (12), and the second concave mirror (13) reflects the laser light at an angle of 0 degrees. The pulsed laser light is transmitted through the rare gas tube (12) again. The laser light is reflected by the reflecting mirror (11) and by the second polarizing mirror (7) to reach the electro-optical crystal switch (8).
2) Oscillating phase: the laser is transmitted through a rare gas tube (12) and reflected by a reflecting mirror (11) and a second polarizer (7), when the laser reaches an electro-optical crystal switch (8), the electro-optical crystal switch (8) loads quarter wave voltage, and the electro-optical crystal switch (8) delays the phase of the laser quarter wave. The quarter wave plate (9) introduces a phase retardation of the quarter wave. The first concave mirror (10) reflects the laser light at zero degrees. The laser light is transmitted through the quarter wave plate (9) in turn, through the electro-optical crystal switch (8) loaded with high voltage, and to the second polarizer (7). The laser passes through the electro-optical crystal switch (8) and the quarter wave plate (9) loaded with high voltage twice to obtain full-wave phase delay, and the polarization direction reaching the second polarizer (7) is always vertical polarization. The second polarizer (7) reflects the laser light in the vertical polarization direction, so that the laser light sequentially reaches the reflector (11), the rare gas tube (12) and the second concave reflector (13). The electro-optical crystal switch (8) is loaded with quarter wave voltage, so that laser can pass through the electro-optical oscillator for a plurality of times. The first concave mirror (10) and the second concave mirror (13) have a focusing function, so that the focus of the pulsed laser light is converged in the rare gas tube (12), the power density of the laser light is increased, and the self-phase modulation nonlinear effect of the rare gas is excited in the rare gas tube (12). The laser power density at the other optics is then below the damage threshold. In the oscillation phase of the electro-optical oscillator, the pulse laser passes through the rare gas tube (12) repeatedly in the electro-optical oscillator, and the nonlinear action distance between the laser and the rare gas in the rare gas tube (12) increases. The self-phase modulation nonlinear effect of the rare gas in the rare gas tube (12) can widen the spectral width of the pulse laser.
3) Output stage: when the laser spectrum is widened to a certain width, the quarter-wave high-voltage applied to the electro-optical crystal switch (8) is removed before the pulse laser is reflected to enter the electro-optical crystal switch (8) through the second polarizer (7). The electro-optical crystal switch (8) does not introduce phase delay, the quarter wave plate (9) introduces phase delay of the quarter wave, laser passes through the quarter wave plate (9) twice, the polarization direction is rotated by 90 degrees, and the vertical polarization is adjusted to the horizontal polarization direction. The pulsed laser light is transmitted through a second polarizer (7) and output from the electro-optical oscillator. The pulse laser transmission sequentially rotates 45 degrees through the polarization direction of the second half wave plate (6), and the polarization direction of the magnetic rotator (5) rotates 45 degrees. The polarization direction of the laser is rotated by 90 degrees, and is adjusted to be vertical to the polarization direction, and the laser is output after being reflected by the polarized first vibrating mirror (4).
The negative dispersion compensator (14) provides negative dispersion to the pulse laser, and the specific implementation forms can be a grating pair, a prism pair or a plurality of negative dispersion mirrors and the like. A negative dispersion compensator (14) compensates for material dispersion of the electro-optical oscillator and positive chirp introduced by the self-phase modulation nonlinear effect. Due to dispersion compensation, the pulse time domain width is compressed, and finally a pulse laser with a narrower width is output.
A gas type ultrashort pulse laser compression method comprises the following steps:
setting the polarization direction of a first half wave plate (3), enabling the polarization direction of laser light after the light source (1) emits input laser light to pass through the first half wave plate (3) to be changed into a horizontal polarization direction, enabling the polarization direction of the laser light to rotate 45 degrees through a magnetic rotator (5), adjusting a second half wave plate (6) to enable the polarization direction of the laser light transmitted by the magnetic rotator (5) to rotate 45 degrees to the horizontal polarization direction, and enabling the laser light to be emitted to a second polarizer (7);
the second step, the laser is transmitted to the electro-optical crystal switch (8) through the second polarizer (7), the electro-optical crystal switch (8) is not loaded with voltage, the laser is transmitted to the first concave reflector (10) after sequentially transmitting through the electro-optical crystal switch (8) and the quarter wave plate (9), the laser is transmitted to the second polarizer (7) after being reflected and sequentially transmitted to the quarter wave plate (9) and the electro-optical crystal switch (8), the laser is reflected to the reflector (11) by the second polarizer (7), and the laser is reflected to the rare gas tube (12) by the reflector (11);
and thirdly, transmitting laser to a second concave reflecting mirror (13) by a rare gas pipe (12), reflecting the laser by the second concave reflecting mirror (13), transmitting the laser to a second polarizer (7) by a reflecting mirror (11) after transmitting the laser through the rare gas pipe (12), reflecting the laser to an electro-optical crystal switch (8) by the second polarizer (7), setting the on time T of the electro-optical crystal switch (8), loading a quarter wave voltage, then reciprocating the laser in an electro-optical oscillator to the electro-optical crystal switch (8) to be turned off, outputting the laser to a first polarizer (4), reflecting the laser by the first polarizer (4), and then outputting the laser from a negative dispersion compensator (14).
The on-time of the electro-optical crystal switch (8) is obtained by calculation as follows:
wherein L is the optical path length of the electro-optical oscillator, c is the light velocity, N is the round trip frequency of light in the electro-optical oscillator, and is a set value.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. A gas-type ultrashort pulse laser compression system, comprising: a light source (1), a lens group (2), a first half wave plate (3), a first polarizer (4), a magnetic gyrator (5), a second half wave plate (6), an electro-optical oscillator, a rare gas tube (12) and a negative dispersion compensator (14);
the lens group (2), the first half-wave plate (3), the first polarizer (4), the magnetic gyrator (5), the second half-wave plate (6) and the electro-optical oscillator are sequentially arranged on a light path of the light source (1), ultra-short pulse laser emitted by the light source (1) is received, the negative dispersion compensator (14) is arranged on a light path reflected by the first polarizer (4), the laser reflected by the first polarizer (4) is received, and the rare gas tube (12) is arranged in the electro-optical oscillator;
a light source (1) for emitting ultra-short pulse laser light;
a lens group (2) for adjusting the aperture of the laser beam;
the first half-wave plate (3) and the second half-wave plate (6) rotate the polarization direction of laser;
a first polarizer (4) that transmits laser light in a horizontal polarization direction and reflects laser light in a vertical polarization direction;
a magneto-rotator (5) for rotating the polarization direction of the laser light by 45 DEG;
an electro-optical oscillator for controlling the laser to reciprocate in the electro-optical oscillator;
a rare gas tube (12) for providing a rare gas environment;
a negative dispersion compensator (14) for providing negative dispersion to the laser light and compensating for the dispersion introduced by the rare gas tube (12).
2. The system of claim 1, wherein the electro-optic oscillator comprises: a second polarizer (7), an electro-optical crystal switch (8), a quarter-wave plate (9), a first concave reflecting mirror (10), a reflecting mirror (11) and a second concave reflecting mirror (13);
the second polarizer (7), the electro-optical crystal switch (8), the quarter wave plate (9) and the first concave reflecting mirror (10) are sequentially arranged on a light path of laser transmitted by the second half wave plate (6), the transmitted light of the first polarizer (4) is received, the reflecting mirror (11) is arranged on a reflecting light path of the second polarizer (7), the rare gas tube (12) is arranged between the reflecting mirror (11) and the second concave reflecting mirror (13), and the rare gas tube (12) and the second concave reflecting mirror (13) are sequentially arranged on a reflecting light path of the reflecting mirror (11);
a second polarizer (7) that transmits laser light in a horizontal polarization direction and reflects laser light in a vertical polarization direction;
an electro-optical crystal switch (8) for providing a phase delay for the transmitted laser light in accordance with the applied voltage;
a quarter wave plate (9) providing a quarter phase retardation for the transmitted laser light;
a first concave mirror (10), a second concave mirror (13) and a mirror (11) for reflecting laser light.
3. A system according to claim 2, characterized in that the lens group (2) is constituted by at least one lens having a meniscus surface coated with a laser antireflection film.
4. The system of claim 2, wherein the noble gas tube (12) comprises: the gas pipe body (12-1), the window sheet (12-2) and the inflation and deflation port (12-3), wherein the window sheet (12-2) is sealed at two sides of the gas pipe body (12-1) to form a sealed space, and the inflation and deflation port (12-3) is arranged at the side end of the gas pipe body (12-1);
a gas pipe body (12-1) for storing helium, neon, argon or krypton;
a window sheet (12-2) coated with a laser antireflection film system for transmitting laser;
and an inflation/deflation port (12-3) for inflating and deflating the gas pipe body (12-1).
5. A system according to any of claims 2-4, characterized in that the light source (1) has a pulse width ranging from femtoseconds to picoseconds and a wavelength ranging from ultraviolet to mid-infrared.
6. A method of gas-based ultrashort pulse laser compression based on any of the systems of claims 2-5, comprising the steps of:
setting the polarization direction of a first half wave plate (3), enabling the polarization direction of laser light after the light source (1) emits input laser light to pass through the first half wave plate (3) to be changed into a horizontal polarization direction, enabling the polarization direction of the laser light to rotate 45 degrees through a magnetic rotator (5), adjusting a second half wave plate (6) to enable the polarization direction of the laser light transmitted by the magnetic rotator (5) to rotate 45 degrees to the horizontal polarization direction, and enabling the laser light to be emitted to a second polarizer (7);
the second step, the laser is transmitted to the electro-optical crystal switch (8) through the second polarizer (7), the electro-optical crystal switch (8) is not loaded with voltage, the laser is transmitted to the first concave reflector (10) after sequentially transmitting through the electro-optical crystal switch (8) and the quarter wave plate (9), the laser is transmitted to the second polarizer (7) after being reflected and sequentially transmitted to the quarter wave plate (9) and the electro-optical crystal switch (8), the laser is reflected to the reflector (11) by the second polarizer (7), and the laser is reflected to the rare gas tube (12) by the reflector (11);
and thirdly, transmitting laser to a second concave reflecting mirror (13) by a rare gas pipe (12), reflecting the laser by the second concave reflecting mirror (13), transmitting the laser to a second polarizer (7) by a reflecting mirror (11) after transmitting the laser through the rare gas pipe (12), reflecting the laser to an electro-optical crystal switch (8) by the second polarizer (7), setting the on time T of the electro-optical crystal switch (8), loading a quarter wave voltage, then reciprocating the laser in an electro-optical oscillator to the electro-optical crystal switch (8) to be turned off, outputting the laser to a first polarizer (4), reflecting the laser by the first polarizer (4), and then outputting the laser from a negative dispersion compensator (14).
7. A method as claimed in claim 6, characterized in that the on-time of the electro-optical crystal switch (8) is calculated by:
wherein L is the optical path length of the electro-optical oscillator, c is the light velocity, N is the round trip frequency of light in the electro-optical oscillator, and is a set value.
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| CN202311336200.XA CN117559198A (en) | 2023-10-16 | 2023-10-16 | Gas type ultrashort pulse laser compression system and compression method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311336200.XA CN117559198A (en) | 2023-10-16 | 2023-10-16 | Gas type ultrashort pulse laser compression system and compression method thereof |
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