CN114552353A - Ultrafast laser output pulse time regulation and control method and device - Google Patents
Ultrafast laser output pulse time regulation and control method and device Download PDFInfo
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Abstract
The invention discloses a method and a device for regulating and controlling the output pulse time of ultrafast laser. The invention adopts a first photoelectric detector to obtain a first detector signal with the repetition frequency of MHz-hundred MHz, inputs the first detector signal into a first clock controller, and obtains a synchronous clock signal required by a KHz amplifier and a previous part; the second photoelectric detector acquires a second detector signal with the repetition frequency of KHz magnitude, the second detector signal is input into a second clock controller, a synchronous clock signal required by the rear part of the KHz amplifier is acquired, the second clock controller divides the frequency of the second detector signal to acquire a required output signal with nHz magnitude, and an external trigger provides an external trigger signal for the second clock controller; the laser pulse signal generated by the KHz amplifier is used as the reference clock input of the clock controller, a plurality of clock controllers are used, the frequency division delay of each channel is controlled by external trigger, and the external signal with the precision of ms magnitude is obtained to control the light emission of the laser system, so that the aim of obtaining the accurate light emission time is fulfilled.
Description
Technical Field
The invention relates to the field of laser, in particular to a method and a device for regulating and controlling the output pulse time of ultrafast laser.
Background
Laser is another important invention of human beings following nuclear energy, computers and semiconductors in the 20 th century, and the principle of the invention is that light generated by atomic excited radiation, electrons in atoms absorb energy and then jump from a low energy level to a high energy level, and when the energy falls back from the high energy level to the low energy level, the released energy is released in the form of photons. The photon beam laser excited has highly uniform photon optical characteristics. Therefore, compared with a common light source, the laser has good monochromaticity and directivity and higher brightness. Currently, lasers are used in all industries, where ultrafast lasers, especially femtosecond lasers, are commonly used in various experimental studies. As a high and new technology, laser machining and strengthening technology increasingly shows its advantages. However, further development of laser machining is limited to some extent by the uncertainty of the laser pulse energy in the time coordinate.
A common chirped laser pulse amplification CPA system comprises an oscillator, a stretcher, an amplifier group and a compressor in sequence, wherein a pump provides excitation energy to the amplifier group, as shown in fig. 1, an oscillator generates an ultrashort pulse (pulse width is usually in picosecond or femtosecond order) as a seed source, a stretcher stretches the ultrashort pulse for a time to obtain a long pulse (pulse width is in tens of picoseconds to nanosecond order, and the pulse width after stretching depends on the energy to be finally amplified), an amplifier group is used to amplify the energy of the stretched long pulse to obtain a high-energy pulse, the amplifier group needs to pump to send a pump source pulse as an excitation source of the amplifier, and the high-energy pulse is compressed to the minimum time scale (back to the pulse width order of the seed source) by a compressor to obtain a high-field laser pulse with high peak power.
In the whole CPA system, a seed source is widened to a hundred ps to ns magnitude, the pulse width of a pump source is also the ns magnitude, the amplification process is that the pump source pulses excite a gain medium in an amplifier to an excited state, and then the seed source is excited and amplified after passing through the gain medium. The service life of the gain medium in the excited state is in the order of mus, and when the seed source does not pass through the gain medium when the gain medium is in the excited state, the laser cannot be amplified, so that the amplified laser and the pumping source pulse time need to be synchronized. The currently used methods are shown in fig. 2 and 3: the amplifier group comprises a KHz amplifier and an nHz amplifier, wherein excitation sources of the amplifiers are respectively KHz pumping and nHz pumping, a first menu is arranged between the stretcher and the KHz amplifier, a second menu is arranged between the KHz amplifier and a nHz amplifier, part of output of the oscillator is received by a photoelectric detector, the photoelectric detector is connected to a clock controller, and the clock controller is respectively connected to the first menu, the KHz pumping, the second menu and the nHz pumping;
the seed source part light output by the oscillator is input into the photoelectric detector, the photoelectric detector obtains the seed source pulse electronic signal with the repetition frequency of MHz-hundred MHz, the electronic signal is input into the clock controller, and the synchronous clock signal required by the whole CPA system is obtained: dividing the MHz-hundred MHz seed source pulse electronic signal to obtain a KHz or Hz output signal required by the clock controller, wherein the KHz or Hz output signal obtained by frequency division is strictly synchronous with the MHz-hundred MHz input signal; in addition, the clock controller is also provided with a delay module which provides a delay delta T within 1ms for the output signal of KHz or Hz magnitude after frequency division, and the delay precision is 150 ps; the output signals of the clock controller are respectively a first menu clock signal output to the first menu, a KHz pumping clock signal output to the KHz pumping, a second menu clock signal output to the second menu and a nHz pumping clock signal output to the nHz pumping, the first menu clock signal and the KHz pumping clock signal are KHz-level output signals, the second menu clock signal and the nHz pumping clock signal are Hz-level output signals, and all the signals are delayed. Such clock delayers are commercially available products, typically standford DG645 or laser ISEO.
The clock controller sends a first menu clock signal to a first menu, a seed source part output by the oscillator enters the first menu after passing through the stretcher, the first menu selects KHz pulses from the seed source and enters a KHz amplifier, the clock controller sends KHz pumping clock signals to a KHz pump, the time of the KHz pumping output pump source pulses is controlled by the KHz pumping clock signals output by the clock controller, the KHz pumping source pulses are controlled to precede the amplified KHz pulses, and therefore KHz pulses next to the KHz pumping source pulses pass through the KHz amplifier to obtain KHz pulse amplification light; the pulse output by the KHz amplifier passes through a second menu, the clock controller sends a clock signal of the second menu to the second menu, and the second menu reduces the pulse from the KHz repetition frequency to nHz, wherein n is a natural number which is more than 1 and less than 10; the pulse which is down-converted to nHz enters a nHz amplifier, a clock controller sends a nHz pump clock signal to a nHz pump, so that the time of outputting a pump source pulse by nHz pump is controlled by an nHz pump clock signal output by the clock controller, the nHz pump laser pulse is controlled to precede an amplified nHz pulse, and therefore a nHz pulse next to the nHz pump source pulse passes through a nHz amplifier to obtain nHz pulse amplified light; nHz the ultrashort ultrastrong laser is obtained after the pulse amplified light enters the compressor and the pulse width is compressed. CPA systems of this type are already mature products, such as hundred TW laser from thales, and hundred TW laser from ampliude.
In such a CPA system, the start time of the 0 th pulse signal output from the clock controller is arbitrary. After the pulse time selected by the clock is randomly selected, the pulse which is selected and amplified by the CPA system is selected, and the output laser pulse time cannot be changed. When the user uses the laser pulse, only a certain pulse of nHz pulse output can be selected, and the laser pulse output time cannot be controlled to the ms magnitude.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a device for regulating and controlling the output pulse time of ultrafast laser, which are used for controlling the output pulse time of a chirped laser pulse amplification CPA system.
The invention aims to provide a device for regulating and controlling the pulse time of ultrafast laser output.
The device for regulating and controlling the output pulse time of the ultrafast laser comprises: a first photodetector, a second photodetector, a first clock controller, a second clock controller, and an external trigger; part of output of the oscillator is connected to a first photoelectric detector, the first photoelectric detector is connected to a first clock controller, and the first clock controller is respectively connected to a first menu and a KHz pump; part of output of the KHz amplifier is connected to a second photoelectric detector, the second photoelectric detector is connected to a second clock controller, and the second clock controller is respectively connected to a second menu and an nHz pump; the external trigger is connected to the second clock controller;
the oscillator outputs ultrashort laser pulses with the repetition frequency of MHz-hundred MHz as a seed source, one part of the seed source is input into the first photoelectric detector, and the rest seed source enters the stretcher; the seed source is stretched by a stretcher in a time domain to obtain a long pulse; the long pulse obtained after widening enters a first menu, and the first menu reduces the repetition frequency from the MHz magnitude to the KHz magnitude; then, the seed source is amplified in a KHz amplifier, and the excitation source of the KHz amplifier is a KHz pump; a part of KHz pulse amplified light output by the KHz amplifier is received by the second photoelectric detector, the rest KHz pulse amplified light enters an nHz amplifier for amplification, and an excitation source of a nHz amplifier is nHz pumping; the nHz pulse amplified light output by the nHz amplifier further enters a compressor to be compressed to obtain an ultrashort pulse;
the first photoelectric detector receives a part of a seed source, acquires a first detector signal with the repetition frequency of MHz-hundred MHz, inputs the first detector signal into a first clock controller, and acquires a synchronous clock signal required by a KHz amplifier and the previous part in a CPA system: the first clock controller divides the frequency of a first detector signal of MHz-hundred MHz to obtain a required KHz-magnitude output signal, and at the moment, the KHz-magnitude output signal obtained by frequency division is strictly synchronous with an input signal of MHz-hundred MHz; the output signal of the first clock controller comprises a first menu clock signal output to the first menu and a KHz pumping clock signal output to a KHz pump, and the repetition frequencies of the first menu clock signal and the KHz pumping clock signal are both KHz magnitudes;
the second photoelectric detector receives a part of KHz pulse amplified light, acquires a second detector signal with the repetition frequency of KHz magnitude, inputs the second detector signal into a second clock controller, and acquires a synchronous clock signal required by the rear part of the KHz amplifier in the CPA system: the second clock controller divides the second detector signal to obtain a required output signal with the magnitude of nHz, and at the moment, the output signal with the magnitude of nHz obtained by frequency division is strictly synchronous with the input signal with the MHz-hundred MHz of the first clock controller and the second detector signal with the magnitude of KHz received by the second clock controller; the output signals of the second clock controller comprise a second menu clock signal output to the second menu and a nHz pumping clock signal output to nHz pumping, the repetition frequencies of the second menu clock signal and the nHz pumping clock signal are nHz magnitude, and n is a natural number which is more than or equal to 1 and less than 10; when the external trigger inputs an external trigger signal to the second clock controller, the second clock controller outputs the initial time of the first KHz pulse immediately after the external trigger signal in the second detector signal, that is, the next KHz pulse after the external trigger signal is the first pulse signal of the output signal with the magnitude of nHz, that is, when the delay module of the second clock controller does not provide delay for the output signal with the magnitude of nHz after frequency division, the output signal with the magnitude of nHz and the next second detector signal after the external trigger signal are at the same time;
the second clock controller is also provided with a delay module which provides a delay delta T within 1ms for the output signal of nHz magnitude after frequency division, and the delay precision is 150 ps; when the second clock controller has no external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is arbitrary; when the second clock controller has an external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is controlled by the external trigger signal and is the time of the first pulse signal input after the external trigger signal;
the first clock controller sends a first menu clock signal to a first menu, a part of a seed source output by the oscillator enters the first menu after passing through the stretcher, the first menu selects KHz pulses from the seed source and enters a KHz amplifier, the first clock controller sends the KHz pumping clock signal to a KHz pump, the time of the KHz pump outputting the pumping source pulses is controlled by the KHz pumping clock signal output by the first clock controller, the KHz pumping source pulses are controlled to precede the amplified KHz pulses, and therefore the KHz pulses next to the KHz pumping source pulses pass through the KHz amplifier to obtain KHz pulse amplification light;
KHz pulse amplification light output by a KHz amplifier passes through a second menu, a second clock controller sends a second menu clock signal to the second menu, the second menu reduces the repetition frequency of the KHz pulse amplification light to nHz to obtain nHz pulses, wherein n is a natural number with n being more than or equal to 1 and less than 10; the nHz pulse after frequency reduction enters the nHz amplifier, the second clock controller sends nHz pump clock signals to nHz pump, so that the time of nHz pump output pump source pulses is controlled by nHz pump clock signals output by the second clock controller, nHz pump laser pulses are controlled to precede amplified nHz pulses, and therefore nHz pulses next to nHz pump source pulses pass through the nHz amplifier to obtain nHz pulse amplified light; nHz pulse amplified light enters the compressor and then the pulse width is compressed to obtain ultrashort ultrastrong laser;
when an external trigger provides an external trigger signal to the second clock controller, at the moment, the second clock controller takes a second detector signal immediately after the external trigger signal as a starting signal of an output signal with the magnitude of nHz, and the output signal with the magnitude of nHz corresponds to a KHz pulse immediately after the external trigger signal and serves as a subsequent amplification pulse; since the output signal interval of the KHz order is ms, the output signal of the nHz order can be any one of the output signals of the KHz order, therefore, the time of the output signal of the nHz order can be controlled to be in the ms order.
Further, the clock controller also comprises a time delay device which is arranged between the external trigger and the second clock controller; an external trigger signal provided by external trigger is input to the second clock controller after passing through the time delay device, so that a delay is added to the external trigger signal through the time delay device, the delay time is greater than 0 and less than 10s, and the delay precision is ms, so that a longer-time coarse control output is provided for an output pulse.
Another objective of the present invention is to provide a method for regulating the pulse time of ultrafast laser output.
The invention discloses a method for regulating and controlling the output pulse time of ultrafast laser, which comprises the following steps:
1) the device is provided with:
part of output of the oscillator is connected to a first photoelectric detector, the first photoelectric detector is connected to a first clock controller, and the first clock controller is respectively connected to a first menu and a KHz pump; part of output of the KHz amplifier is connected to a second photoelectric detector, the second photoelectric detector is connected to a second clock controller, and the second clock controller is respectively connected to a second menu and an nHz pump; the external trigger is connected to the second clock controller;
2) the oscillator outputs ultrashort laser pulses with the repetition frequency of MHz-hundred MHz as a seed source, one part of the seed source is input into the first photoelectric detector, and the rest seed source enters the stretcher; the seed source is stretched by a stretcher in a time domain to obtain a long pulse; the long pulse obtained after widening enters a first menu, and the first menu reduces the repetition frequency from the MHz magnitude to the KHz magnitude; then, the seed source is amplified in a KHz amplifier, and the excitation source of the KHz amplifier is a KHz pump; a part of KHz pulse amplified light output by the KHz amplifier is received by the second photoelectric detector, the rest KHz pulse amplified light enters an nHz amplifier for amplification, and an excitation source of a nHz amplifier is nHz pumping; the nHz pulse amplified light output by the nHz amplifier further enters a compressor to be compressed to obtain an ultrashort pulse;
3) the first photoelectric detector receives a part of a seed source, acquires a first detector signal with the repetition frequency of MHz-hundred MHz, inputs the first detector signal into a first clock controller, and acquires a synchronous clock signal required by a KHz amplifier and the previous part in a CPA system: the first clock controller divides the frequency of a first detector signal of MHz-hundred MHz to obtain a required KHz-magnitude output signal, and at the moment, the KHz-magnitude output signal obtained by frequency division is strictly synchronous with an input signal of MHz-hundred MHz; the output signal of the first clock controller comprises a first menu clock signal output to the first menu and a KHz pumping clock signal output to a KHz pump, and the repetition frequencies of the first menu clock signal and the KHz pumping clock signal are both KHz magnitudes;
4) the second photoelectric detector receives a part of KHz pulse amplified light, acquires a second detector signal with the repetition frequency of KHz magnitude, inputs the second detector signal into a second clock controller, and acquires a synchronous clock signal required by the rear part of the KHz amplifier in the CPA system: the second clock controller divides the second detector signal to obtain a required output signal with the magnitude of nHz, and at the moment, the output signal with the magnitude of nHz obtained by frequency division is strictly synchronous with the input signal with the MHz-hundred MHz of the first clock controller and the second detector signal with the magnitude of KHz received by the second clock controller; the output signals of the second clock controller comprise a second menu clock signal output to the second menu and a nHz pumping clock signal output to nHz pumping, the repetition frequencies of the second menu clock signal and the nHz pumping clock signal are nHz magnitude, and n is a natural number which is more than or equal to 1 and less than 10; when the external trigger inputs an external trigger signal to the second clock controller, the second clock controller outputs the initial time of the first KHz pulse immediately after the external trigger signal in the second detector signal, that is, the next KHz pulse after the external trigger signal is the first pulse signal of the output signal with the magnitude of nHz, that is, when the delay module of the second clock controller does not provide delay for the output signal with the magnitude of nHz after frequency division, the output signal with the magnitude of nHz and the next second detector signal after the external trigger signal are at the same time;
5) the second clock controller is also provided with a delay module which provides a delay delta T within 1ms for the output signal of nHz magnitude after frequency division, and the delay precision is 150 ps; when the second clock controller has no external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is arbitrary; when the second clock controller has an external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is controlled by the external trigger signal and is the time of the first pulse signal input after the external trigger signal;
6) the first clock controller sends a first menu clock signal to a first menu, a part of a seed source output by the oscillator enters the first menu after passing through the stretcher, the first menu selects KHz pulses from the seed source and enters a KHz amplifier, the first clock controller sends the KHz pumping clock signal to a KHz pump, the time of the KHz pump outputting the pumping source pulses is controlled by the KHz pumping clock signal output by the first clock controller, the KHz pumping source pulses are controlled to precede the amplified KHz pulses, and therefore the KHz pulses next to the KHz pumping source pulses pass through the KHz amplifier to obtain KHz pulse amplification light;
7) KHz pulse amplification light output by a KHz amplifier passes through a second menu, a second clock controller sends a second menu clock signal to the second menu, the second menu reduces the repetition frequency of the KHz pulse amplification light to nHz to obtain nHz pulses, wherein n is a natural number with n being more than or equal to 1 and less than 10; the nHz pulse after frequency reduction enters the nHz amplifier, the second clock controller sends nHz pump clock signals to nHz pump, so that the time of nHz pump output pump source pulses is controlled by nHz pump clock signals output by the second clock controller, nHz pump laser pulses are controlled to precede amplified nHz pulses, and therefore nHz pulses next to nHz pump source pulses pass through the nHz amplifier to obtain nHz pulse amplified light; nHz pulse amplified light enters the compressor and then the pulse width is compressed to obtain ultrashort ultrastrong laser;
8) when an external trigger provides an external trigger signal to the second clock controller, at the moment, the second clock controller takes a second detector signal immediately after the external trigger signal as a starting signal of an output signal with the magnitude of nHz, and the output signal with the magnitude of nHz corresponds to a KHz pulse immediately after the external trigger signal and serves as a subsequent amplification pulse; since the output signal interval of the KHz order is ms, the output signal of the nHz order can be any one of the output signals of the KHz order, therefore, the time of the output signal of the nHz order can be controlled to be in the ms order. The invention has the advantages that:
in the laser system, a laser pulse signal generated by a KHz amplifier is used as a reference clock input of a clock controller, and a plurality of clock controllers are used to obtain an external signal with the precision of ms magnitude to control the laser system to emit light, so that the aim of obtaining accurate light emitting time is fulfilled.
Drawings
Fig. 1 is a block diagram of a CPA system in the prior art;
FIG. 2 is a block diagram of a prior art CPA system for controlling the pulse timing synchronization of laser and pump source;
FIG. 3 is a pulse timing diagram illustrating the pulse timing synchronization control of the laser and pump source of a CPA system of the prior art;
FIG. 4 is a block diagram of a first embodiment of an apparatus for ultrafast laser output pulse time modulation in accordance with the present invention;
FIG. 5 is a pulse timing diagram of a synchronous control of an apparatus for ultrafast laser output pulse time regulation according to a first embodiment of the present invention;
fig. 6 is a block diagram of a second embodiment of the ultrafast laser output pulse time control apparatus according to the present invention.
Detailed Description
The invention will be further elucidated by means of specific embodiments in the following with reference to the drawing.
Example one
As shown in fig. 4, the apparatus for regulating the pulse time of ultrafast laser output according to the present embodiment includes: a first photodetector, a second photodetector, a first clock controller, a second clock controller, and an external trigger; part of output of the oscillator is connected to a first photoelectric detector, the first photoelectric detector is connected to a first clock controller, and the first clock controller is respectively connected to a first menu and a KHz pump; part of output of the KHz amplifier is connected to a second photoelectric detector, the second photoelectric detector is connected to a second clock controller, and the second clock controller is respectively connected to a second menu and an nHz pump; the external trigger is connected to the second clock controller.
The oscillator outputs ultrashort laser pulses with the repetition frequency of MHz-hundred MHz as a seed source, one part of the seed source is input into the first photoelectric detector, and the rest seed source enters the stretcher; the seed source is stretched by a stretcher in a time domain to obtain long pulses (the pulse width length is dozens of picoseconds to nanosecond order); the long pulse obtained after widening enters a first menu, and the first menu reduces the repetition frequency from the MHz magnitude to the KHz magnitude; then, the seed source is amplified in a KHz amplifier, and the excitation source of the KHz amplifier is a KHz pump; a part of KHz pulse amplified light output by the KHz amplifier is received by the second photoelectric detector, the rest KHz pulse amplified light enters an nHz amplifier for amplification, and an excitation source of a nHz amplifier is nHz pumping; the nHz pulse amplified light output by the nHz amplifier further enters a compressor to be compressed to obtain an ultrashort pulse;
the first photoelectric detector receives a part of a seed source, acquires a first detector signal with the repetition frequency of MHz-hundred MHz, inputs the first detector signal into a first clock controller, and acquires a synchronous clock signal required by a KHz amplifier and the previous part in a CPA system: the first clock controller divides the frequency of a first detector signal of MHz-hundred MHz to obtain a required KHz-magnitude output signal, and at the moment, the KHz-magnitude output signal obtained by frequency division is strictly synchronous with an input signal of MHz-hundred MHz; the output signal of the first clock controller comprises a first menu clock signal output to the first menu and a KHz pumping clock signal output to a KHz pump, and the repetition frequencies of the first menu clock signal and the KHz pumping clock signal are both KHz magnitudes;
the second photoelectric detector receives a part of KHz pulse amplified light, acquires a second detector signal with the repetition frequency of KHz magnitude, inputs the second detector signal into a second clock controller, and acquires a synchronous clock signal required by the rear part of the KHz amplifier in the CPA system: the second clock controller divides the second detector signal to obtain a required output signal with the magnitude of nHz, and at the moment, the output signal with the magnitude of nHz obtained by frequency division is strictly synchronous with the input signal with the MHz-hundred MHz of the first clock controller and the second detector signal with the magnitude of KHz received by the second clock controller; the output signals of the second clock controller comprise a second menu clock signal output to the second menu and a nHz pumping clock signal output to nHz pumping, the repetition frequencies of the second menu clock signal and the nHz pumping clock signal are nHz magnitude, and n is a natural number which is more than or equal to 1 and less than 10; when the external trigger inputs an external trigger signal to the second clock controller, the second clock controller outputs the initial time of the first KHz pulse immediately after the external trigger signal in the second detector signal, that is, the next KHz pulse after the external trigger signal is the first pulse signal of the output signal with the magnitude of nHz, that is, when the delay module of the second clock controller does not provide delay for the output signal with the magnitude of nHz after frequency division, the output signal with the magnitude of nHz and the next second detector signal after the external trigger signal are at the same time;
the second clock controller is also provided with a delay module which provides a delay delta T within 1ms for the output signal of nHz magnitude after frequency division, and the delay precision is 150 ps; when the second clock controller has no external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is arbitrary; when the second clock controller has an external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is controlled by the external trigger signal and is the time of the first pulse signal input after the external trigger signal;
the first clock controller sends a first menu clock signal to a first menu, a part of a seed source output by the oscillator enters the first menu after passing through the stretcher, the first menu selects KHz pulses from the seed source and enters a KHz amplifier, the first clock controller sends the KHz pumping clock signal to a KHz pump, the time of the KHz pump outputting the pumping source pulses is controlled by the KHz pumping clock signal output by the first clock controller, the KHz pumping source pulses are controlled to precede the amplified KHz pulses, and therefore the KHz pulses next to the KHz pumping source pulses pass through the KHz amplifier to obtain KHz pulse amplification light;
KHz pulse amplification light output by a KHz amplifier passes through a second menu, a second clock controller sends a second menu clock signal to the second menu, the second menu reduces the repetition frequency of the KHz pulse amplification light to nHz to obtain nHz pulses, wherein n is a natural number with the repetition frequency not less than 1 and less than 10, and FIG. 5 shows a time sequence when the repetition frequency is reduced to Hz pulse, namely n is 1; the nHz pulse after frequency reduction enters the nHz amplifier, the second clock controller sends nHz pump clock signals to nHz pump, so that the time of nHz pump output pump source pulses is controlled by nHz pump clock signals output by the second clock controller, nHz pump laser pulses are controlled to precede amplified nHz pulses, and therefore nHz pulses next to nHz pump source pulses pass through the nHz amplifier to obtain nHz pulse amplified light; nHz pulse amplified light enters a compressor and then the pulse width is compressed to obtain ultrashort ultrastrong laser;
when an external trigger provides an external trigger signal to the second clock controller, at the moment, the second clock controller takes a second detector signal immediately after the external trigger signal as a starting signal of an output signal with the magnitude of nHz, and the output signal with the magnitude of nHz corresponds to a KHz pulse immediately after the external trigger signal and serves as a subsequent amplification pulse; since the output signal interval of the KHz order is ms, the output signal of the nHz order can be any one of the output signals of the KHz order, therefore, the time of the output signal of the nHz order can be controlled in the ms order.
Fig. 5 shows a pulse timing chart of the synchronous control of the present embodiment, and in fig. 5, 0, 1, 2, 3, 4, 5, 6, 7 … 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007 is the number of laser pulses or the output signal sequence of the clock controller.
Example two
As shown in fig. 6, in the present embodiment, a time delay device is further included, which is disposed between the external trigger and the second clock controller; an external trigger signal provided by external trigger is input to the second clock controller after passing through the time delay device, so that a delay is added to the external trigger signal through the time delay device, the delay time is greater than 0 and less than 10s, and the delay precision is ms, so that a longer-time coarse control output is provided for an output pulse. The other steps are the same as those of the first embodiment.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
Claims (6)
1. The utility model provides a device of regulation and control of ultrafast laser output pulse time for control chirped laser pulse amplifies the laser pulse output time of CPA system, CPA system includes oscillator, stretcher, amplifier group and compressor in proper order, and amplifier group includes KHz amplifier and nHz amplifier, and the excitation is KHz pumping and nHz pumping respectively, sets up first menu between stretcher and KHz amplifier, sets up the second menu between KHz amplifier and nHz amplifier, characterized in that, the device of regulation and control of ultrafast laser output pulse time includes: a first photodetector, a second photodetector, a first clock controller, a second clock controller, and an external trigger; part of output of the oscillator is connected to a first photoelectric detector, the first photoelectric detector is connected to a first clock controller, and the first clock controller is respectively connected to a first menu and a KHz pump; part of output of the KHz amplifier is connected to a second photoelectric detector, the second photoelectric detector is connected to a second clock controller, and the second clock controller is respectively connected to a second menu and an nHz pump; the external trigger is connected to the second clock controller;
the oscillator outputs ultrashort laser pulses with the repetition frequency of MHz-hundred MHz as a seed source, one part of the seed source is input into the first photoelectric detector, and the rest seed source enters the stretcher; the seed source is stretched by a stretcher in a time domain to obtain a long pulse; the long pulse obtained after widening enters a first menu, and the first menu reduces the repetition frequency from the MHz magnitude to the KHz magnitude; then, the seed source is amplified in a KHz amplifier, and the excitation source of the KHz amplifier is a KHz pump; a part of KHz pulse amplified light output by the KHz amplifier is received by the second photoelectric detector, the rest KHz pulse amplified light enters an nHz amplifier for amplification, and an excitation source of a nHz amplifier is nHz pumping; the nHz pulse amplified light output by the nHz amplifier further enters a compressor to be compressed to obtain an ultrashort pulse;
the first photoelectric detector receives a part of a seed source, acquires a first detector signal with the repetition frequency of MHz-hundred MHz, inputs the first detector signal into a first clock controller, and acquires a synchronous clock signal required by a KHz amplifier and the previous part in a CPA system: the first clock controller divides the frequency of a first detector signal of MHz-hundred MHz to obtain a required KHz-magnitude output signal, and at the moment, the KHz-magnitude output signal obtained by frequency division is strictly synchronous with an input signal of MHz-hundred MHz; the output signal of the first clock controller comprises a first menu clock signal output to the first menu and a KHz pumping clock signal output to a KHz pump, and the repetition frequencies of the first menu clock signal and the KHz pumping clock signal are both KHz magnitudes;
the second photoelectric detector receives a part of KHz pulse amplified light, acquires a second detector signal with the repetition frequency of KHz magnitude, inputs the second detector signal into a second clock controller, and acquires a synchronous clock signal required by the rear part of the KHz amplifier in the CPA system: the second clock controller divides the second detector signal to obtain a required output signal with the magnitude of nHz, and at the moment, the output signal with the magnitude of nHz obtained by frequency division is strictly synchronous with the input signal with the MHz-hundred MHz of the first clock controller and the second detector signal with the magnitude of KHz received by the second clock controller; the output signals of the second clock controller comprise a second menu clock signal output to the second menu and a nHz pumping clock signal output to nHz pumping, the repetition frequencies of the second menu clock signal and the nHz pumping clock signal are nHz magnitude, and n is a natural number which is more than or equal to 1 and less than 10; when the external trigger inputs an external trigger signal to the second clock controller, the second clock controller outputs the initial time of the first KHz pulse immediately after the external trigger signal in the second detector signal, that is, the next KHz pulse after the external trigger signal is the first pulse signal of the output signal with the magnitude of nHz, that is, when the delay module of the second clock controller does not provide delay for the output signal with the magnitude of nHz after frequency division, the output signal with the magnitude of nHz and the next second detector signal after the external trigger signal are at the same time;
the second clock controller is also provided with a delay module which is used for providing delay for the output signal of nHz magnitude after frequency division; when the second clock controller has no external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is arbitrary; when the second clock controller has an external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is controlled by the external trigger signal and is the time of the first pulse signal input after the external trigger signal;
the first clock controller sends a first menu clock signal to a first menu, a part of a seed source output by the oscillator enters the first menu after passing through the stretcher, the first menu selects KHz pulses from the seed source and enters a KHz amplifier, the first clock controller sends the KHz pumping clock signal to a KHz pump, the time of the KHz pump outputting the pumping source pulses is controlled by the KHz pumping clock signal output by the first clock controller, the KHz pumping source pulses are controlled to precede the amplified KHz pulses, and therefore the KHz pulses next to the KHz pumping source pulses pass through the KHz amplifier to obtain KHz pulse amplification light;
KHz pulse amplification light output by a KHz amplifier passes through a second menu, a second clock controller sends a second menu clock signal to the second menu, the second menu reduces the repetition frequency of the KHz pulse amplification light to nHz to obtain nHz pulses, wherein n is a natural number with n being more than or equal to 1 and less than 10; the nHz pulse after frequency reduction enters the nHz amplifier, the second clock controller sends nHz pump clock signals to nHz pump, so that the time of nHz pump output pump source pulses is controlled by nHz pump clock signals output by the second clock controller, nHz pump laser pulses are controlled to precede amplified nHz pulses, and therefore nHz pulses next to nHz pump source pulses pass through the nHz amplifier to obtain nHz pulse amplified light; nHz pulse amplified light enters the compressor and then the pulse width is compressed to obtain ultrashort ultrastrong laser;
when an external trigger provides an external trigger signal to the second clock controller, at the moment, the second clock controller takes a second detector signal immediately behind the external trigger signal as a starting signal of an output signal with nHz magnitude, and the output signal with nHz magnitude corresponds to a KHz pulse immediately behind the external trigger signal and serves as a subsequent amplification pulse; since the output signal interval of the KHz order is ms, the output signal of the nHz order can be any one of the output signals of the KHz order, therefore, the time of the output signal of the nHz order can be controlled to be in the ms order.
2. The apparatus for ultrafast laser output pulse time manipulation of claim 1, wherein said delay module provides a delay Δ T within 1ms of the divided nHz magnitude output signal.
3. The apparatus for ultrafast laser output pulse time modulation of claim 1, further comprising time delay means disposed between the external trigger and the second clock controller; an external trigger signal provided by the external trigger is input to the second clock controller after passing through the time delay device, so that a delay is added to the external trigger signal through the time delay device, the delay time is more than 0 and less than 10s, and a coarse control output with a longer time is provided for an output pulse.
4. A method for regulating and controlling the pulse time of ultrafast laser output, which is characterized by comprising the following steps:
1) the device is provided with:
part of output of the oscillator is connected to a first photoelectric detector, the first photoelectric detector is connected to a first clock controller, and the first clock controller is respectively connected to a first menu and a KHz pump; part of output of the KHz amplifier is connected to a second photoelectric detector, the second photoelectric detector is connected to a second clock controller, and the second clock controller is respectively connected to a second menu and an nHz pump; the external trigger is connected to the second clock controller;
2) the oscillator outputs ultrashort laser pulses with the repetition frequency of MHz-hundred MHz as a seed source, one part of the seed source is input into the first photoelectric detector, and the rest seed source enters the stretcher; the seed source is stretched by a stretcher in a time domain to obtain a long pulse; the long pulse obtained after widening enters a first menu, and the first menu reduces the repetition frequency from the MHz magnitude to the KHz magnitude; then, the seed source is amplified in a KHz amplifier, and the excitation source of the KHz amplifier is a KHz pump; a part of KHz pulse amplified light output by the KHz amplifier is received by the second photoelectric detector, the rest KHz pulse amplified light enters an nHz amplifier for amplification, and an excitation source of a nHz amplifier is nHz pumping; the nHz pulse amplified light output by the nHz amplifier further enters a compressor to be compressed to obtain an ultrashort pulse;
3) the first photoelectric detector receives a part of a seed source, acquires a first detector signal with the repetition frequency of MHz-hundred MHz, inputs the first detector signal into a first clock controller, and acquires a synchronous clock signal required by a KHz amplifier and the previous part in a CPA system: the first clock controller divides the frequency of a first detector signal of MHz-hundred MHz to obtain a required KHz-magnitude output signal, and at the moment, the KHz-magnitude output signal obtained by frequency division is strictly synchronous with an input signal of MHz-hundred MHz; the output signal of the first clock controller comprises a first menu clock signal output to the first menu and a KHz pumping clock signal output to a KHz pump, and the repetition frequencies of the first menu clock signal and the KHz pumping clock signal are both KHz magnitudes;
4) the second photoelectric detector receives a part of KHz pulse amplified light, acquires a second detector signal with the repetition frequency of KHz magnitude, inputs the second detector signal into a second clock controller, and acquires a synchronous clock signal required by the rear part of the KHz amplifier in the CPA system: the second clock controller divides the frequency of the second detector signal to obtain a required output signal with nHz magnitude, and at the moment, the output signal with nHz magnitude obtained by frequency division is strictly synchronous with the input signal with MHz-hundred MHz of the first clock controller and the second detector signal with KHz magnitude received by the second clock controller; the output signals of the second clock controller comprise a second menu clock signal output to the second menu and a nHz pumping clock signal output to nHz pumping, the repetition frequencies of the second menu clock signal and the nHz pumping clock signal are nHz magnitude, and n is a natural number which is more than or equal to 1 and less than 10; when the external trigger inputs an external trigger signal to the second clock controller, the second clock controller outputs the initial time of the first KHz pulse immediately after the external trigger signal in the second detector signal, that is, the next KHz pulse after the external trigger signal is the first pulse signal of the output signal with the magnitude of nHz, that is, when the delay module of the second clock controller does not provide delay for the output signal with the magnitude of nHz after frequency division, the output signal with the magnitude of nHz and the next second detector signal after the external trigger signal are at the same time;
5) the second clock controller is also provided with a delay module which is used for providing delay for the output signal of nHz magnitude after frequency division; when the second clock controller has no external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is arbitrary; when the second clock controller has an external trigger signal input, the starting time of the 0 th pulse signal output by the second clock controller is controlled by the external trigger signal and is the time of the first pulse signal input after the external trigger signal;
6) the first clock controller sends a first menu clock signal to a first menu, a part of a seed source output by the oscillator enters the first menu after passing through the stretcher, the first menu selects KHz pulses from the seed source and enters a KHz amplifier, the first clock controller sends the KHz pumping clock signal to a KHz pump, the time of the KHz pump outputting the pumping source pulses is controlled by the KHz pumping clock signal output by the first clock controller, the KHz pumping source pulses are controlled to precede the amplified KHz pulses, and therefore the KHz pulses next to the KHz pumping source pulses pass through the KHz amplifier to obtain KHz pulse amplification light;
7) KHz pulse amplification light output by a KHz amplifier passes through a second menu, a second clock controller sends a second menu clock signal to the second menu, the second menu reduces the repetition frequency of the KHz pulse amplification light to nHz to obtain nHz pulses, wherein n is a natural number with n being more than or equal to 1 and less than 10; the nHz pulse after frequency reduction enters the nHz amplifier, the second clock controller sends nHz pump clock signals to nHz pump, so that the time of nHz pump output pump source pulses is controlled by nHz pump clock signals output by the second clock controller, nHz pump laser pulses are controlled to precede amplified nHz pulses, and therefore nHz pulses next to nHz pump source pulses pass through the nHz amplifier to obtain nHz pulse amplified light; nHz pulse amplified light enters a compressor and then the pulse width is compressed to obtain ultrashort ultrastrong laser;
8) when an external trigger provides an external trigger signal to the second clock controller, at the moment, the second clock controller takes a second detector signal immediately after the external trigger signal as a starting signal of an output signal with the magnitude of nHz, and the output signal with the magnitude of nHz corresponds to a KHz pulse immediately after the external trigger signal and serves as a subsequent amplification pulse; since the output signal interval of the KHz order is ms, the output signal of the nHz order can be any one of the output signals of the KHz order, therefore, the time of the output signal of the nHz order can be controlled to be in the ms order.
5. The method of claim 4, wherein in step 5) the delay module provides a delay Δ T within 1ms for the divided output signal of the order of nHz.
6. The method of claim 4, wherein a time delay device is provided between the external trigger and the second clock controller; an external trigger signal provided by external trigger is input to the second clock controller after passing through the time delay device, so that a delay is added to the external trigger signal through the time delay device, the delay time is more than 0 and less than 10s, and a coarse control output with a longer time is provided for an output pulse.
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