CN207250927U - A kind of laser phase-locking device - Google Patents
A kind of laser phase-locking device Download PDFInfo
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- CN207250927U CN207250927U CN201721318568.3U CN201721318568U CN207250927U CN 207250927 U CN207250927 U CN 207250927U CN 201721318568 U CN201721318568 U CN 201721318568U CN 207250927 U CN207250927 U CN 207250927U
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Abstract
A kind of laser phase-locking device is the utility model is related to, it includes：A sequentially connected mode-locked laser and an electric signal extraction unit；One microwave reference source；The fundamental wave phase demodulation unit and a harmonic wave phase demodulation unit being connected with the electric signal extraction unit and the microwave reference source；First switching switch and the second switching switch；One loop control unit；And one be connected to the outer digital supervision unit of ring between the loop control unit and the mode-locked laser.The utility model possesses significant low-noise characteristic, and synchronization accuracy has high stability concurrently up to tens of femtosecond magnitudes, the workplace for needing continuously to run for a long time suitable for laser.
Description
Technical field
It the utility model is related to a kind of mode-locked laser Phase Lock Technique in Microwave photonics field, more particularly to a kind of base
In the laser pulse train laser phase-locking device of double microwave phase discriminators.
Background technology
Explore and disclose microstructure change process of the material on atom, molecular scale to biology, chemistry, material, ring
Many multi-disciplinary development such as border, medicine have very important significance, and realize that this target needs detecting devices to have sub-nanometer
The temporal resolution of the spatial resolution of level and sub- femtosecond magnitude.Pumping based on X-ray light-probe user experiment can be with winged
The microphenomenon of the temporal resolution observation atomic scale of second-time, therefore have become a kind of common detection means.
At present, the temporal resolution of the pumping based on X-ray light-probe user experiment is primarily limited to pumping laser pulse
Time jitter between the X-ray detection pulse produced with accelerator, this time jitter are mainly derived from driving laser and kind
Time between time jitter between son/pumping laser, and the microwave signal of laser and driving electron beam group accelerating structure
Shake, therefore the laser of femtosecond magnitude is synchronous with microwave, the Ti∶Sapphire laser especially with femtosecond magnitude short pulse, high pulse energy
Pumping-probe experiment of the high-precise synchronization of laser and girz microwave signal to femtosecond time resolution rate is most important.
Laser is synchronously to adjust port by controlling the resonator of laser to grow with microwave, by the weight of laser pulse train
What complex frequency and PGC demodulation were realized in the microwave reference source of high stability Low phase noise.Locking within bandwidth, laser pulse
String has the phase noise characteristic identical with microwave reference source, and the time jitter of laser itself is minimized, so as to fulfill swashing
The high-precise synchronization of light device and microwave.The operation principle of laser phase-locked technology is, by phase discriminator obtain laser to be locked with it is micro-
Phase difference between ripple reference source, the phase signal feed back to laser after treatment, to adjust the resonance of laser
Chamber chamber is grown, so as to change the repetition rate of pulse laser, until laser pulse train is locked in microwave reference source.
At present, three kinds can be divided into according to the classification of used phase discriminator, laser phase-locked technology：
The first is based on light-microwave equilibration phase discriminator, the light which is driven by Sagnac fiber optic loop, microwave signal
Phase-modulator, balance optical detector and other optics are formed, and this technical solution can realize swashing below ten femtoseconds
Light and microwave synchronization accuracy, but the influence of the easy light pulse broadening effect of the phase discriminator and the unbalance effect of luminous power, Qian Zhehui
The noise floor of light-microwave equilibration phase discriminator is raised, the latter is unstable it will cause phase discriminator operating point, and composition light-
The optics of microwave equilibration phase discriminator needs fine adjustment, does not possess flexibility；
It is based on light-light phase discriminator for second, the phase discriminator is by multiple optics using bbo crystal or PPKTP crystal as core
Device is formed, and the registration of two-beam pulse on a timeline can be changed into electric signal, therefore can reach at least light arteries and veins
The precision of phase discrimination of scale is rushed, but the technical solution based on light-light phase discriminator needs that laser is first locked in a light pulse
In reference signal, then girz microwave signal is extracted from the light pulse reference signal, to realize laser and microwave indirectly
High-precise synchronization, in addition, light-light phase discriminator requires two-beam pulse to overlap on a timeline, thus also need to one it is extra
Electricity phaselocked loop, phase is slightly first locked into two-beam pulse, then adjust the phase of wherein a branch of light pulse, until two-beam pulse energy
Overlap on a timeline, technical solution is complex, and the light path for forming light-light phase discriminator is free space light path, light path
It is larger to adjust difficulty；
The third is based on microwave phase discriminator, which is microwave mixer, simple in structure, but this technical solution is usual
Simply laser pulse train is locked in the microwave reference source of single-frequency, and in the outer kind for producing X-ray detection pulse
In subtype free-electron laser device, also require seed laser to be rolled into a ball with electron beam has identical lengthwise position, i.e. laser all the time
Device should be locked in the microwave signal of driving electron beam group accelerating structure, to be also locked in the laser pulse with laser emitting
Repetition rate go here and there with a fundamental wave reference signal of frequency, and it is changeable between two kinds of phase lock modes.
Utility model content
In order to solve the above-mentioned problems of the prior art, the utility model, which aims to provide one kind, can flexibly switch lock phase mould
The laser phase-locking device that formula, synchronization accuracy are high, noise is low and stable, with realize the laser pulse train of mode-locked laser with it is outer
Femtosecond magnitude between portion's microwave reference source is synchronous.
A kind of laser phase-locking device described in the utility model, it includes：
One has the mode-locked laser of hysteroscope PZT control ports and hysteroscope motor control port；
The one electric signal extraction unit being connected with the mode-locked laser, its laser arteries and veins for being emitted the mode-locked laser
Rush string and be converted to electric signal, and extract fundamental signal and harmonic signal in the electric signal；
The one fundamental wave phase demodulation unit being connected with the electric signal extraction unit, it will be micro- outside the fundamental signal and one
The fundamental wave reference signal mixing that ripple reference source provides, and generate a fundamental wave phase difference signal；
The one harmonic wave phase demodulation unit being connected with the electric signal extraction unit, it joins the harmonic signal and the microwave
The harmonic reference signal mixing of source offer is provided, and generates a harmonic wave phase difference signal；
One loop control unit, it is connected by the first switching switch with the fundamental wave phase demodulation unit, and is cut by second
Change switch to be connected with the harmonic wave phase demodulation unit, the loop control unit is to the fundamental wave phase difference signal and/or the harmonic wave phase
Difference signal carries out signal processing, and exports feedback adjustment signal to the hysteroscope PZT control ports of the mode-locked laser, with
The chamber length of the resonator of the mode-locked laser is adjusted, so that the repetition rate of the laser pulse train is adjusted, until the laser
Train of pulse is synchronous with the microwave reference source；And
The one outer digital supervision unit of the ring being connected between the loop control unit and the mode-locked laser, it is in institute
State the PZT driving voltages monitoring signals and a default threshold value that the loop control unit is provided after mode-locked laser lock phase
Compare, and corresponding control signal is exported to the hysteroscope motor control port of the mode-locked laser, to control the lock
Hysteroscope motor movement in the resonator of mode laser.
Further, in above-mentioned laser phase-locking device, the outer digital supervision unit of the ring includes：It is connected in turn described
A digital supervision module and one between loop control unit and the hysteroscope motor control port of the mode-locked laser
Motor controller, wherein,
The digital supervision module includes：One FPGA development boards, it includes：
One low speed ADC converters, it receives and digitizes the PZT driving voltages monitoring signals；And
The one FPGA master controllers being connected with the low speed ADC converters, it will be through after the mode-locked laser locks phase
The digitized PZT driving voltages monitoring signals and the threshold value comparison, when it exceedes the threshold value, are controlled by a serial ports
Chip exports a movement instruction to the motor controller so that the motor controller according to the movement instruction to the locked mode
The hysteroscope motor control port of laser exports the control signal.
Preferably, in above-mentioned laser phase-locking device, the outer digital supervision unit of the ring also extracts single with the electric signal
First and described fundamental wave phase demodulation unit connection, on the one hand detects the phase between the fundamental signal and the fundamental wave reference signal
Difference and difference on the frequency, and judge whether the difference on the frequency exceedes the repetition frequency of the laser pulse train in mode-locked laser lock phase front
The default adjustable range of rate, and corresponding control signal is exported to the hysteroscope motor control port of the mode-locked laser,
To control the hysteroscope motor movement in the resonator of the mode-locked laser, on the other hand receive and electricity is driven according to the PZT
The phase difference and difference on the frequency between monitoring signals, the fundamental signal and the fundamental wave reference signal are pressed, monitors the laser lock
The loop circuit state of phase device.
It is further preferred that in above-mentioned laser phase-locking device, the outer digital supervision unit of the ring includes：It is connected in turn
A digital supervision module between the loop control unit and the hysteroscope motor control port of the mode-locked laser with
And a motor controller, and the computer being connected with the digital supervision module, wherein, the digital supervision module also with institute
State electric signal extraction unit and fundamental wave phase demodulation unit connection.
Further preferable, in above-mentioned laser phase-locking device, the digital supervision module includes：One with the telecommunications
Number extraction unit and the high-speed ADC converter of fundamental wave phase demodulation unit connection and one it is connected with the high-speed ADC converter
FPGA development boards, wherein,
The high-speed ADC converter is configured to：Receive and digitize the fundamental signal and the fundamental wave reference signal；
The FPGA development boards include：
One low speed ADC converters, it receives and digitizes the PZT driving voltages monitoring signals；And
The one FPGA master controllers being connected with the low speed ADC converters and the high-speed ADC converter, its one side
Digital Signal Processing is carried out to the fundamental signal being digitized into and the fundamental wave reference signal to obtain the fundamental signal
Phase difference and difference on the frequency between the fundamental wave reference signal, and judge that the difference on the frequency is in mode-locked laser lock phase front
The default adjustable range of the no repetition rate more than the laser pulse train, if exceeding, by a serial ports control chip to institute
State motor controller and export a movement instruction so that the motor controller according to the movement instruction to the mode-locked laser
The hysteroscope motor control port exports the control signal, on the one hand will be digitized into after the mode-locked laser locks phase
The PZT driving voltages monitoring signals and the threshold value comparison, when it exceedes the threshold value, by a serial ports control chip to institute
State motor controller and export a movement instruction so that the motor controller according to the movement instruction to the mode-locked laser
The hysteroscope motor control port exports the control signal, on the other hand by an ethernet control chip to the computer
Export the phase between the PZT driving voltages monitoring signals, the fundamental signal and the fundamental wave reference signal being digitized into
Potential difference and difference on the frequency, so that the loop circuit state of laser phase-locking device described in the computer monitoring.
Further, in above-mentioned laser phase-locking device, the loop control unit includes：Sequentially connected loop electricity
Son learns module and a PZT drivers, wherein,
The output terminal of first switching switch and the second switching switch is connected to the input of the loop electrical module
End, and the loop electrical module is configured to：The fundamental wave phase difference signal and/or the harmonic wave phase difference signal are carried out adjustable
Gain amplification plus adjustable DC biasing, filtering and amplitude limiting processing, and export corresponding processing signal to the PZT drivers；
The output terminal of the PZT drivers is connected to the hysteroscope PZT control ports of the mode-locked laser, and described
PZT drivers are configured to：On the one hand the processing signal is amplified and added and be equal to a hysteroscope PZT central task voltages
After direct current biasing, the feedback adjustment signal is exported to the hysteroscope PZT control ports of the mode-locked laser, on the other hand
Digital supervision unit provides the PZT driving voltages monitoring signals to outside the ring.
Further, in above-mentioned laser phase-locking device, the loop electrical module includes：It is connected in turn described
An adjustable gain circuit, a direct current between the output terminal and the PZT drivers of first switching switch and the second switching switch
Biasing circuit, an active PI filter circuits and a two-way amplitude limiter circuit, and one be connected with the DC bias circuit it is adjustable
Voltage source circuit.
Further, in above-mentioned laser phase-locking device, the electric signal extraction unit includes：With the mode-locked laser
Sequentially connected beam splitter, photodetector and the first microwave power distributor, be connected to first microwave power distributor in turn
The first bandpass filter, the first low noise amplifier and the second microwave work(point between one output port and the fundamental wave phase demodulation unit
Device, and second be connected in turn between the second output port of first microwave power distributor and the harmonic wave phase demodulation unit
Bandpass filter, the second low noise amplifier and the 3rd microwave power distributor, wherein, first bandpass filter is operated in fundamental wave frequency
Rate, the fundamental frequency are the repetition rate of the laser pulse train, and second bandpass filter is operated in harmonic frequency, this is humorous
Wave frequency rate is the Integer N times of the repetition rate of the laser pulse train.
Further, in above-mentioned laser phase-locking device, the fundamental wave phase demodulation unit includes：It is connected to the telecommunications in turn
The first microwave mixer and the 4th microwave power distributor number between extraction unit and the microwave reference source, wherein, described first
The output terminal of microwave mixer is connected with first switching switch.
Further, in above-mentioned laser phase-locking device, the harmonic wave phase demodulation unit includes：It is connected to the telecommunications in turn
The second microwave mixer and microwave phase shifter number between extraction unit and the microwave reference source, wherein, second microwave
The output terminal of frequency mixer is connected with second switching switch, and the phase shift range of the microwave phase shifter is more than the harmonic reference
The cycle of signal.
Further, in above-mentioned laser phase-locking device, first switching switch and the second switching switch are simulation
Switch.
As a result of above-mentioned technical solution, the utility model is on the basis of traditional analog phaselocked loop, using double
Microwave phase discriminator structure, i.e., use fundamental wave phase demodulation unit and harmonic wave phase demodulation unit at the same time, the mode-locked laser is locked in fundamental wave
Flexibly switch between phase state and harmonic wave phase locked state；Meanwhile the utility model makes locked mode by using digital supervision unit outside ring
Laser can be with long-time steady operation without losing lock；In addition, the utility model using adjustable loop electrical module with
Microwave phase shifter, can continuously adjust mode-locked laser large scale and high accuracy and be referred to external microwave reference source, especially fundamental wave
Relative phase between signal, and the locking bandwidth of loop can be continuously adjusted using adjustable loop electrical module online
To obtain optimal time shake.The utility model possesses significant low-noise characteristic, and synchronization accuracy is up to tens of femtosecond magnitudes, together
When have high stability concurrently, need the workplace that continuously run for a long time suitable for laser.
Brief description of the drawings
Fig. 1 is a kind of functional block diagram of laser phase-locking device of the utility model；
Fig. 2 is a kind of structure diagram of laser phase-locking device of the utility model；
Fig. 3 is a kind of structure diagram of laser phase-locking device intermediate ring road electronics module of the utility model；
Fig. 4 is a kind of structure diagram of the outer digital supervision module of laser phase-locking device middle ring of the utility model；
Fig. 5 shows the mode-locked laser realized using the utility model reality synchronous with microwave reference signal femtosecond magnitude
Survey result.
Embodiment
Below in conjunction with the accompanying drawings, the preferred embodiment of the utility model is provided, and is described in detail.
Refer to attached drawing 1-4, the utility model, i.e., a kind of laser phase-locking device, including：Mode-locked laser 1, electric signal carry
Take unit 2, fundamental wave phase demodulation unit 3, harmonic wave phase demodulation unit 4, the first switching switch 5, the second switching switch 6, loop control unit
7th, the outer digital supervision unit 8 of ring and exterior microwave reference source 9, wherein, the first switching switch 5 and the second switching switch 6 are equal
For analog switch.
Mode-locked laser 1 has hysteroscope PZT (piezoelectric ceramics) control ports and hysteroscope motor control port.
Electric signal extraction unit 2 is connected with mode-locked laser 1, it is used for the laser pulse train for being emitted mode-locked laser 1
Electric signal is converted to, and extracts fundamental signal and harmonic signal in the electric signal, which specifically includes：
Beam splitter 21 sequentially connected with mode-locked laser 1,22 and first microwave power distributor 23 of photodetector, be connected to first in turn
The first bandpass filter 24, the amplification of the first low noise between the first output port and fundamental wave phase demodulation unit 3 of microwave power distributor 23
25 and second microwave power distributor 26 of device, and it is connected to the second output port and harmonic wave phase demodulation of the first microwave power distributor 23 in turn
The second bandpass filter 27, the second low noise amplifier 28 and the 3rd microwave power distributor 29 between unit 4.Mode-locked laser 1 goes out
The laser pulse train penetrated passes through beam splitter 21, and most of transmission output is anti-to laser regenerative amplifier (not shown), fraction
Photodetector 22 is incident upon, is ultimately converted to electric signal output, which divides for two-way through the first microwave power distributor 23, all the way
Fundamental signal is extracted through the first bandpass filter 24, the first low noise amplifier 25, and is divided to through the second microwave power distributor 26 for two
Road exports, and another way extracts harmonic signal through the second bandpass filter 27, the second low noise amplifier 28, and through the 3rd microwave work(
Divide device 29 to divide to export for two-way, wherein, the first bandpass filter 24 is operated in fundamental frequency, which is laser pulse train
Repetition rate, the second bandpass filter 27 is operated in harmonic frequency, the harmonic frequency for the fundamental frequency Integer N times.
Fundamental wave phase demodulation unit 3 is connected with electric signal extraction unit 2, it is used to provide fundamental signal and microwave reference source 9
The mixing of fundamental wave reference signal, and generate fundamental wave phase difference signal, it is specifically included：Be connected in turn the second microwave power distributor 26 with
The first microwave mixer 31 and the 4th microwave power distributor 32 between microwave reference source 9, wherein, the first microwave mixer 31 it is defeated
Outlet is connected with the first switching switch 5.
Harmonic wave phase demodulation unit 4 is connected with electric signal extraction unit 2, it is used to provide harmonic signal and microwave reference source 9
Harmonic reference signal (the harmonic reference signal and fundamental wave reference signal are homologous, and the frequency of the harmonic reference signal is fundamental wave
The Integer N of the frequency of reference signal times) mixing, and harmonic wave phase difference signal is generated, it is specifically included：It is connected to the 3rd microwave in turn
The second microwave mixer 41 and microwave phase shifter 42 between power splitter 29 and microwave reference source 9, wherein, the second microwave mixer
41 output terminal is connected with the second switching switch 6, and the phase shift range of microwave phase shifter 42 is more than the cycle of harmonic reference signal.
Loop control unit 7 is connected by the first switching switch 5 with fundamental wave phase demodulation unit 3, and passes through the second switching switch 6
It is connected with the harmonic wave phase demodulation unit 4, it is specifically included：Sequentially connected loop electrical module 71 and PZT drivers 72, its
In：
The output terminal of first switching switch 5 and the second switching switch 6 is connected to the input terminal of loop electrical module 71, and
The loop electrical module 71 is configured to：Adjustable gain amplification is carried out to fundamental wave phase difference signal and/or harmonic wave phase difference signal plus can
Tuning DC biasing, filtering and amplitude limiting processing, and export corresponding processing signal to PZT drivers 72；The loop electrical module
71 be substantially a signal processing circuit, and as a global design on one piece of printed circuit board, it is specifically included for it：According to
The secondary adjustable gain circuit being connected between the first switching switch 5 and the output terminal and PZT drivers 72 of the second switching switch 6
711st, DC bias circuit 712, active PI filter circuits 713 and double limiting circuit 714, and with DC bias circuit 712
The adjustable voltage source circuit 715 of connection, wherein, adjustable gain circuit 711 may include fixed gain amplifier and adjustable resistance
Bleeder circuit, adjustable voltage source circuit 715 may include linear regulator chip and adjustable resistance bleeder circuit, above-mentioned adjustable resistance
Bleeder circuit may include the fixed resistance value resistor being connected in series and adjustable resistance resistors, and DC bias circuit 712 is to add
Method circuit or subtraction circuit, active PI filter circuits 713 are the active PI filter circuits of single order or second order active PI filter circuits；
The output terminal of PZT drivers 72 is connected to the hysteroscope PZT control ports of mode-locked laser 1, and the PZT drivers 72
It is configured to：On the one hand after being amplified to processing signal and adding and be equal to the direct current biasing of hysteroscope PZT central task voltages, Xiang Suo
The hysteroscope PZT control ports output feedback adjustment signal of mode laser 1, so that the resonator of quick regulation mode-locked laser 1
Chamber is grown, to adjust the repetition rate of laser pulse train, i.e. the fundamental frequency of laser pulse train is (due to the harmonic wave of laser pulse train
Into multiple proportion between frequency and fundamental frequency, therefore the corresponding harmonic frequency that also have adjusted laser pulse train), until this swashs
Optical pulse train is synchronous with microwave reference source 9, i.e. laser pulse train is locked in microwave reference signal (including the base of microwave reference source 9
Reference signal wave harmony reference signal wave) on (" locking " here refers to the locking in phase, and after locking, laser pulse train
Fundamental frequency and harmonic frequency respectively with the fundamental wave reference frequency and harmonic wave reference frequency of microwave reference source 9 phase correspondingly
Together), on the other hand the PZT drivers 72 digital supervision unit 8 to outside ring provides (and the PZT drivings of PZT driving voltages monitoring signals
Current monitor signal).
Digital supervision unit 8 is connected between loop control unit 7 and mode-locked laser 1 ring outside, and and and electric signal
Extraction unit 2 and fundamental wave phase demodulation unit 3 connect, it is specifically included：It is connected to PZT drivers 72 and mode-locked laser 1 in turn
Hysteroscope motor control port between digital supervision module 81 and motor controller 82, and connect with digital supervision module 81
The computer 83 connect, wherein：
Digital supervision module 81 is also connected with the second microwave power distributor 26 and the 4th microwave power distributor 32, its specific bag
Include：The high-speed ADC converter 811 that is connected with the second microwave power distributor 26 and the 4th microwave power distributor 32 and with the high speed
The FPGA development boards 812 that ADC converters 811 connect, wherein,
High-speed ADC converter 811 is configured to：Receive and the fundamental signal that exports the second microwave power distributor 26 and from the 4th
The fundamental wave reference signal digitlization that microwave power distributor 42 exports；
FPGA development boards 812 include：
Low speed ADC converters 8121, it receives and digitizes above-mentioned PZT driving voltages monitoring signals；And
The FPGA master controllers 8122 being connected with low speed ADC converters 8121 and high-speed ADC converter 811, one side
Phase front is locked in mode-locked laser 1 Digital Signal Processing, and profit are carried out to the fundamental signal and fundamental wave reference signal that are digitized into face
The phase difference and difference on the frequency between fundamental signal and fundamental wave reference signal are obtained with digital IQ technologies, and whether judges the difference on the frequency
More than the default adjustable range of the repetition rate of laser pulse train, if exceeding, pass through serial ports control chip 8123 and serial ports
Cable exports movement instruction to motor controller 82, to adjust the hysteroscope motor in the resonator of mode-locked laser 1, until above-mentioned
Difference on the frequency returns to the repetition rate adjustable range of laser pulse train, on the one hand will be digitized into after mode-locked laser 1 locks phase
(setting of the threshold value is to make hysteroscope PZT always work in center to PZT driving voltages monitoring signals with default threshold value comparison
It is damaged in a setting range near operating voltage to avoid hysteroscope PZT, the bound difference of threshold voltage in the present embodiment
It is arranged to 85V and 55V), when it exceedes the threshold value, by serial ports control chip 8123 and serial ports cable to motor controller
82 output movement instructions, slowly adjust the hysteroscope motor in the resonator of mode-locked laser 1, move closer to PZT driving voltages
The central task voltage of hysteroscope PZT, so as to ensure that mode-locked laser 1 can be with long-time steady operation without losing lock, the opposing party
Face exports the PZT driving voltages being digitized into computer 83 by ethernet control chip 8124 and RJ45 cables and monitors letter
Number, phase difference and difference on the frequency between fundamental signal and fundamental wave reference signal so that computer 83 monitors laser phase-locking device
Loop circuit state, is carried out at the same time data and shows；
Motor controller 82 drives cable to be connected with the hysteroscope motor control port of mode-locked laser 1 by motor, it is matched somebody with somebody
It is set to：Corresponding control signal is exported to the hysteroscope motor control port of mode-locked laser 1 according to above-mentioned movement instruction, with control
Hysteroscope motor movement in the resonator of mode-locked laser 1.
The operation principle of above-mentioned laser phase-locking device is described in detail below.First, electric signal extraction unit 2 is utilized
The laser pulse train that mode-locked laser 1 is emitted is converted into electric signal, and extracts the fundamental signal in the electric signal and harmonic wave letter
Number；
Secondly, the fundamental wave reference signal provided fundamental signal and microwave reference source 9 using fundamental wave phase demodulation unit 3 is mixed,
To generate fundamental wave phase difference signal, and the harmonic reference for being provided harmonic signal and microwave reference source 9 using harmonic wave phase demodulation unit 4 is believed
Number mixing, to generate harmonic wave phase difference signal；
Then, by the unlatching of the first switching switch 5 and/or the second switching switch 6, selected using loop control unit 7
Carry out signal processing to fundamental wave phase difference signal and/or harmonic wave phase difference signal, and to the hysteroscope PZT control ports of mode-locked laser 1
Feedback adjustment signal is exported, to adjust the chamber of the resonator of mode-locked laser 1 length, so as to adjust the repetition frequency of laser pulse train
Rate, until the laser pulse train is synchronous with microwave reference source 9, wherein：(at this time, the mode-locked laser when opening the first switching switch 5
Device 1 is in fundamental wave lock phase operating mode), mode-locked laser 1 is locked in fundamental wave reference signal, i.e. the fundamental wave of laser pulse train
Frequency is identical with fundamental wave reference frequency, its PGC demodulation is in fundamental wave reference signal；When opening the second switching switch 6 (at this time,
Mode-locked laser 1 is in Harmonic phase locking operating mode), mode-locked laser 1 is locked on harmonic reference signal, i.e. laser pulse
The harmonic frequency of string is identical with harmonic reference frequency, its PGC demodulation is on harmonic reference signal；Switch when opening first at the same time
(at this time, mode-locked laser 1 is in principal wave harmonic wave lock phase operating mode), mode-locked laser 1 when switch 5 and the second switching switch 6
It is locked at the same time on fundamental wave reference signal harmony reference signal wave, i.e. the fundamental frequency of laser pulse train and fundamental wave reference frequency
Identical, its harmonic frequency is identical with harmonic reference frequency, its phase is locked in fundamental wave reference signal harmony reference signal wave at the same time
On；
Finally, after mode-locked laser 1 locks phase, loop control unit 7 is provided using digital supervision unit 8 outside ring
PZT driving voltages monitoring signals and default threshold value comparison, and should to the hysteroscope motor control port the output phase of mode-locked laser 1
Control signal, to control the hysteroscope motor movement in the resonator of mode-locked laser 1.
The utility model can also be in the following manner：The first switching switch 5 is first opened, is locked in laser pulse train
(that is, mode-locked laser 1 is in fundamental wave lock phase operating mode) in fundamental wave reference signal, and adjust loop control in this case
The output voltage of adjustable voltage source circuit 715 in unit 7 processed, so that between coarse adjustment laser pulse train and fundamental wave reference signal
Relative phase, is then turned on the second switching switch 6, laser pulse train is locked in fundamental wave reference signal harmony reference signal wave at the same time
Upper (that is, mode-locked laser 1 is in principal wave harmonic wave lock phase operating mode again), the first switching switch 5 is finally closed, makes laser arteries and veins
Claw is rushed to be scheduled on harmonic reference signal and (that is, mode-locked laser 1 is in Harmonic phase locking operating mode), and in this state
Under：On the one hand the microwave phase shifter 42 in harmonic wave phase demodulation unit 4 is adjusted, so that the accurate adjustment laser pulse on the basis of above-mentioned coarse adjustment
Relative phase between string and fundamental wave reference signal；On the other hand the adjustable gain circuit 711 in loop control unit 7 is adjusted
Gain, so that on-line control loop bandwidth.It is noted that when switching above-mentioned lock phase operating mode, mode-locked laser 1 will not
Losing lock.
In addition, locking phase front in mode-locked laser 1, the outer digital supervision unit 8 of ring can also be utilized to judge fundamental signal and base
Whether the difference on the frequency of reference signal wave exceedes the default adjustable range of the repetition rate of laser pulse train, and to mode-locked laser 1
Hysteroscope motor control port export corresponding control signal, to control the hysteroscope motor in the resonator of mode-locked laser to transport
It is dynamic.
In the present embodiment, mode-locked laser 1 is concerned with the commercial Ti∶sapphire mode-locked laser of company for the U.S., laser center
Wavelength 800nm, pulse width 130fs, repetition rate 79.33MHz, the laser provide a hysteroscope PZT control terminal to the user
Mouth and a hysteroscope motor control port, control the hysteroscope PZT and hysteroscope motor of laser resonant cavity, so as to adjust resonance respectively
Chamber chamber is grown, and the wherein drive voltage range of hysteroscope PZT is 10V~130V, and central task voltage is 70V, drivable hysteroscope row
8 μm of Cheng Yuewei, adjustable laser pulse train repetition frequency range about 500Hz, the stroke range of hysteroscope motor is 13mm or so,
Adjustable laser pulse train repetition frequency range is 0.5MHz or so.
In the present embodiment, photodetector 22 model ET4000, responsive bandwidth 10GHz, it is by mode-locked laser 1
The laser pulse train of outgoing is converted to electric signal, and divides through the first microwave power distributor 23 for two-way：All the way by being operated in
The first bandpass filter 24, the first low noise amplifier 25, the second microwave power distributor 26 of 79.33MHz frequencies are detected in electric signal
Fundamental signal and low noise amplification after be classified as two-way, another way is by being operated in the second bandpass filtering of 2856MHz frequencies
Device 27, the second low noise amplifier 28, the 3rd microwave power distributor 29 detect 36 rd harmonic signals in electric signal and amplify its low noise
After be divided into two-way, wherein all the way be used for monitor.
In the present embodiment, microwave reference source 9 is point-frequency signal source, the homologous high stability of exportable two-way
79.33MHz fundamental waves reference signal and 2856MHz harmonic reference signals.The 79.33MHz fundamental waves reference signal warp of microwave reference source 9
4th microwave power distributor 32 divides for two-way, wherein 79.33MHz fundamental waves reference signal and the output of the second microwave power distributor 26 all the way
79.33MHz fundamental signals are mixed in the first microwave mixer 31 and obtain fundamental wave phase difference signal all the way, microwave reference source 9
The 2856MHz harmonic signals all the way that 2856MHz harmonic references signal is exported through 42 and the 3rd microwave power distributor 29 of microwave phase shifter
Mixing obtains harmonic wave phase difference signal in the second microwave mixer 41.The another way that above-mentioned second microwave power distributor 26 exports
79.33MHz fundamental signals and the another way 79.33MHz fundamental wave reference signals of the 4th microwave power distributor 32 output are respectively connected to
The outer digital supervision module 81 of ring.
In the present embodiment, adjustable gain circuit 711 is using the fixed increasing built by low noise precision amplifier and precision resistance
Beneficial amplifier and adjustable resistance bleeder circuit composition, wherein, adjustable resistance bleeder circuit is by precision resistance and adjustable resistance value electricity
Resistance device is composed in series, and adjusts the resistance value of the resistor, you can changes loop gain, so as to continuously adjust loop bandwidth.
In the present embodiment, adjustable voltage source circuit 715 is by -5V linear regulator chips, adjustable resistance bleeder circuit ,+5V lines
Property voltage stabilizing chip be in series, wherein, adjustable resistance bleeder circuit is composed in series by precision resistance and adjustable resistance resistors, adjust
The resistance value of the resistor is saved, output voltage can be made continuously adjustable between -5V~+5V.
In the present embodiment, active PI filter circuits 713 use what is built by low noise precision amplifier and precision resistance capacitance
The active PI filter circuits of single order, when loop is in the lock state, the input of active PI filter circuits 713 is always 0V DC, at this time
The direct current biasing of above-mentioned DC bias circuit 712 is adjusted, that is, adjusts the output voltage of adjustable voltage source circuit 715, you can adjust
Keyed end so that phase of the coarse adjustment laser pulse train relative to microwave reference signal, phase adjustment range up to for -80 °~
80 °, it is incorporated in the use of microwave phase shifter 42 of the 2856MHz harmonic frequencies with 360 ° of phase shift ranges, you can accurate adjust is swashed
Optical pulse train relative to fundamental wave reference signal phase.Regulative mode is as follows：It is inclined that direct current is adjusted in the case where fundamental wave locks phase operating mode
The direct current biasing of circuits 712, then switches to principal wave harmonic wave lock phase operating mode, then after being switched to Harmonic phase locking operating mode
Adjust microwave phase shifter 42, you can continuously adjust the laser pulse train and the base of external microwave reference source 9 of the outgoing of mode-locked laser 1
Relative phase between reference signal wave, for 79.33MHz fundamental frequencies, adjustable range is -2.8ns~2.8ns, degree of regulation
Less than 1ps, in addition, optionally being accessed between the 4th microwave power distributor 32 and the first microwave mixer 31 one 1 meter long or 2
The long microwave cable of rice, will introduce the time delays of about 4ns or 8ns respectively, can expand above-mentioned relative phase adjustable range respectively
1.2ns~6.8ns or 5.2ns~10.8ns is opened up, so that the laser pulse train that mode-locked laser 1 is emitted is locked in
Any setting phase position of 79.33MHz fundamental wave reference signals.
In the present embodiment, the voltage gain of PZT drivers 72 is 20V/V, there is provided the direct current biasing of 0~150V, for
The output current monitoring port that family provides the output voltage monitoring port that gain is 50mV/V, gain is 1V/A.
In the present embodiment, the sample clock frequency of the clock of FPGA master controllers 8122 and high-speed ADC converter 811 is
119MHz, can be provided by external microwave reference source 9, can also be provided by the clock module on FPGA development boards 812.
It is as shown in figure 5, synchronous with microwave reference signal femtosecond magnitude using the mode-locked laser that the utility model is realized
The result of actual measurement shows that：After locking phase, (in offset carrier 10Hz-10KHz frequency ranges), the phase of mode-locked laser are being locked within phase bandwidth
Noise follows the phase noise of microwave reference signal, locks beyond phase bandwidth that locked mode swashs (in offset carrier 10KHz-10MHz frequency ranges)
The phase noise of light device follows the phase noise of free running laser, is trembled to opposite between mode-locked laser and microwave reference signal
Dynamic phase noise curve integration, you can obtain the synchronization accuracy between mode-locked laser and microwave reference signal；In the present embodiment,
After phase being locked using the device of the utility model to mode-locked laser, the product between mode-locked laser and 2.856GHz microwave reference signals
Timesharing jitter is 25fs [10-10KHz].
In conclusion the utility model only achieves that lock phase using double microwave phase discriminator structures with two analog switches
The flexible switching of pattern, so that laser pulse train is locked in the setting phase of megahertz fundamental wave reference signal, meanwhile, it can obtain
Laser pulse train is taken to be locked in the ultralow time jitter that could be realized on girz high-frequency signal；Meanwhile the utility model utilizes
One microwave phase shifter and adjustable resistor can large scale and high accuracy continuously adjust mode-locked laser relative to megahertz
The phase of fundamental wave reference signal, using an adjustable resistance resistors can on-line control loop locking bandwidth it is optimal to obtain
Time jitter, laser is with microwave reference signal synchronization accuracy up to tens of femtosecond magnitudes.The utility model is using simulation sum number
The loop control program that word is combined, ring is interior to carry out quick feedback control using modeling scheme, has the characteristics that low noise low delay,
Slow feedback control is carried out using digital scheme outside ring, loop is worked with long-time stable.
It is above-described, it is only the preferred embodiment of the utility model, is not intended to limit the scope of the utility model, this
Above-described embodiment of utility model can also make a variety of changes.I.e. every claims according to the present utility model application and
Simple, the equivalent changes and modifications that description is made, fall within the claims of the utility model patent.This
The not detailed description of utility model is routine techniques content.
Claims (11)
1. a kind of laser phase-locking device, it is characterised in that described device includes：
One has the mode-locked laser of hysteroscope PZT control ports and hysteroscope motor control port；
The one electric signal extraction unit being connected with the mode-locked laser, its laser pulse train for being emitted the mode-locked laser
Electric signal is converted to, and extracts fundamental signal and harmonic signal in the electric signal；
The one fundamental wave phase demodulation unit being connected with the electric signal extraction unit, it joins the microwave outside the fundamental signal and one
The fundamental wave reference signal mixing of source offer is provided, and generates a fundamental wave phase difference signal；
The one harmonic wave phase demodulation unit being connected with the electric signal extraction unit, it is by the harmonic signal and the microwave reference source
The harmonic reference signal mixing of offer, and generate a harmonic wave phase difference signal；
One loop control unit, it is connected by the first switching switch with the fundamental wave phase demodulation unit, and is opened by the second switching
Pass is connected with the harmonic wave phase demodulation unit, and the loop control unit is to the fundamental wave phase difference signal and/or harmonic wave difference letter
Number carry out signal processing, and to the mode-locked laser the hysteroscope PZT control ports export feedback adjustment signal, with adjust
The chamber length of the resonator of the mode-locked laser, so that the repetition rate of the laser pulse train is adjusted, until the laser pulse
String is synchronous with the microwave reference source；And
The one outer digital supervision unit of the ring being connected between the loop control unit and the mode-locked laser, it is in the lock
The PZT driving voltages monitoring signals that the loop control unit is provided after mode laser lock phase and a default threshold value ratio
Compared with, and corresponding control signal is exported to the hysteroscope motor control port of the mode-locked laser, to control the locked mode
Hysteroscope motor movement in the resonator of laser.
2. laser phase-locking device according to claim 1, it is characterised in that the outer digital supervision unit of the ring also with it is described
Electric signal extraction unit and fundamental wave phase demodulation unit connection, on the one hand detect the fundamental signal and the fundamental wave with reference to letter
Phase difference and difference on the frequency between number, and judge whether the difference on the frequency exceedes the laser arteries and veins in mode-locked laser lock phase front
The default adjustable range of the repetition rate of string is rushed, and should to the hysteroscope motor control port the output phase of the mode-locked laser
Control signal, to control the hysteroscope motor movement in the resonator of the mode-locked laser, on the other hand receive and according to institute
The phase difference and difference on the frequency between PZT driving voltages monitoring signals, the fundamental signal and the fundamental wave reference signal are stated, is monitored
The loop circuit state of the laser phase-locking device.
3. laser phase-locking device according to claim 1 or 2, it is characterised in that the loop control unit includes：Successively
A loop electrical module and a PZT drivers for connection, wherein,
The output terminal of first switching switch and the second switching switch is connected to the input terminal of the loop electrical module, and
The loop electrical module is configured to：Adjustable gain is carried out to the fundamental wave phase difference signal and/or the harmonic wave phase difference signal
Amplification plus adjustable DC biasing, filtering and amplitude limiting processing, and export corresponding processing signal to the PZT drivers；
The output terminal of the PZT drivers is connected to the hysteroscope PZT control ports of the mode-locked laser, and the PZT
Driver is configured to：On the one hand the processing signal is amplified and added and be equal to the straight of a hysteroscope PZT central task voltages
After stream biasing, the feedback adjustment signal is exported to the hysteroscope PZT control ports of the mode-locked laser, on the other hand to
The outer digital supervision unit of the ring provides the PZT driving voltages monitoring signals.
4. laser phase-locking device according to claim 3, it is characterised in that the loop electrical module includes：Successively
The adjustable gain electricity being connected between the output terminal of first switching switch and the second switching switch and the PZT drivers
Road, a DC bias circuit, an active PI filter circuits and a two-way amplitude limiter circuit, and one and DC bias circuit company
The adjustable voltage source circuit connect.
5. laser phase-locking device according to claim 1, it is characterised in that the outer digital supervision unit of the ring includes：According to
The secondary numeral prison being connected between the loop control unit and the hysteroscope motor control port of the mode-locked laser
Module and a motor controller are controlled, wherein,
The digital supervision module includes：One FPGA development boards, it includes：
One low speed ADC converters, it receives and digitizes the PZT driving voltages monitoring signals；And
The one FPGA master controllers being connected with the low speed ADC converters, it will be through numeral after the mode-locked laser locks phase
The PZT driving voltages monitoring signals changed and the threshold value comparison, when it exceedes the threshold value, pass through a serial ports control chip
Export a movement instruction to the motor controller so that the motor controller according to the movement instruction to the mode-locked laser
The hysteroscope motor control port of device exports the control signal.
6. laser phase-locking device according to claim 2, it is characterised in that the outer digital supervision unit of the ring includes：According to
The secondary numeral prison being connected between the loop control unit and the hysteroscope motor control port of the mode-locked laser
Module and a motor controller, and the computer being connected with the digital supervision module are controlled, wherein, the digital supervision mould
Block is also connected with the electric signal extraction unit and the fundamental wave phase demodulation unit.
7. laser phase-locking device according to claim 6, it is characterised in that the digital supervision module includes：One and institute
The high-speed ADC converter and one for stating electric signal extraction unit and fundamental wave phase demodulation unit connection are changed with the high-speed ADC
The FPGA development boards of device connection, wherein,
The high-speed ADC converter is configured to：Receive and digitize the fundamental signal and the fundamental wave reference signal；
The FPGA development boards include：
One low speed ADC converters, it receives and digitizes the PZT driving voltages monitoring signals；And
The one FPGA master controllers being connected with the low speed ADC converters and the high-speed ADC converter, its one side is to warp
The digitized fundamental signal and the fundamental wave reference signal carry out Digital Signal Processing to obtain the fundamental signal and institute
The phase difference and difference on the frequency between fundamental wave reference signal are stated, and judges whether the difference on the frequency surpasses in mode-locked laser lock phase front
The default adjustable range of the repetition rate of the laser pulse train is crossed, if exceeding, by a serial ports control chip to the horse
A movement instruction is exported up to controller, so that the motor controller is according to the movement instruction to the mode-locked laser
Hysteroscope motor control port exports the control signal, on the one hand will be digitized into after the mode-locked laser locks phase described in
PZT driving voltages monitoring signals and the threshold value comparison, when it exceedes the threshold value, by a serial ports control chip to the horse
A movement instruction is exported up to controller, so that the motor controller is according to the movement instruction to the mode-locked laser
Hysteroscope motor control port exports the control signal, is on the other hand exported by an ethernet control chip to the computer
Phase difference between the PZT driving voltages monitoring signals, the fundamental signal and the fundamental wave reference signal that are digitized into
And difference on the frequency, so that the loop circuit state of laser phase-locking device described in the computer monitoring.
8. laser phase-locking device according to claim 1, it is characterised in that the electric signal extraction unit includes：With institute
State the sequentially connected beam splitter of mode-locked laser, photodetector and the first microwave power distributor, to be connected to described first in turn micro-
The first bandpass filter, the first low noise amplifier between first output port of ripple power splitter and the fundamental wave phase demodulation unit and
Second microwave power distributor, and it is connected to the second output port of first microwave power distributor and the harmonic wave phase demodulation list in turn
The second bandpass filter, the second low noise amplifier and the 3rd microwave power distributor between member, wherein, first bandpass filter
Fundamental frequency is operated in, which is the repetition rate of the laser pulse train, and second bandpass filter is operated in
Harmonic frequency, the harmonic frequency are the Integer N times of the repetition rate of the laser pulse train.
9. laser phase-locking device according to claim 1, it is characterised in that the fundamental wave phase demodulation unit includes：Connect successively
The first microwave mixer and the 4th microwave power distributor being connected between the electric signal extraction unit and the microwave reference source, its
In, the output terminal of first microwave mixer is connected with first switching switch.
10. laser phase-locking device according to claim 1, it is characterised in that the harmonic wave phase demodulation unit includes：Connect successively
The second microwave mixer and microwave phase shifter being connected between the electric signal extraction unit and the microwave reference source, wherein,
The output terminal of second microwave mixer is connected with second switching switch, and the phase shift range of the microwave phase shifter is more than
The cycle of the harmonic reference signal.
11. laser phase-locking device according to claim 1, it is characterised in that first switching switch and the second switching
Switch is analog switch.
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| CN201721318568.3U CN207250927U (en) | 2017-10-13 | 2017-10-13 | A kind of laser phase-locking device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611759A (en) * | 2017-10-13 | 2018-01-19 | 中国科学院上海应用物理研究所 | A kind of laser phase-locking device and method |
| CN109347549A (en) * | 2018-08-17 | 2019-02-15 | 中国科学院上海应用物理研究所 | A kind of high bandwidth radiofrequency signal measurements of arrival time method |
| CN109813451A (en) * | 2019-03-01 | 2019-05-28 | 中国科学院物理研究所 | The all phase measurement of ultrashort pulse and locking means and corresponding device |
| CN110391894A (en) * | 2019-08-30 | 2019-10-29 | 清华大学 | Receiving end, synchronization system and the particle accelerator of synchronization system |
| CN114389136A (en) * | 2021-12-14 | 2022-04-22 | 中国科学院上海高等研究院 | Double-phase-discrimination laser phase locking device and method |
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2017
- 2017-10-13 CN CN201721318568.3U patent/CN207250927U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611759A (en) * | 2017-10-13 | 2018-01-19 | 中国科学院上海应用物理研究所 | A kind of laser phase-locking device and method |
| CN109347549A (en) * | 2018-08-17 | 2019-02-15 | 中国科学院上海应用物理研究所 | A kind of high bandwidth radiofrequency signal measurements of arrival time method |
| CN109347549B (en) * | 2018-08-17 | 2020-11-06 | 中国科学院上海应用物理研究所 | High-bandwidth radio frequency signal arrival time measuring device and method |
| CN109813451A (en) * | 2019-03-01 | 2019-05-28 | 中国科学院物理研究所 | The all phase measurement of ultrashort pulse and locking means and corresponding device |
| CN110391894A (en) * | 2019-08-30 | 2019-10-29 | 清华大学 | Receiving end, synchronization system and the particle accelerator of synchronization system |
| CN114389136A (en) * | 2021-12-14 | 2022-04-22 | 中国科学院上海高等研究院 | Double-phase-discrimination laser phase locking device and method |
| CN114389136B (en) * | 2021-12-14 | 2023-08-29 | 中国科学院上海高等研究院 | Dual phase discrimination laser phase locking device and method |
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