CN108390250A - A kind of feedback device and laser generating system for intermediate-freuqncy signal frequency stabilization - Google Patents
A kind of feedback device and laser generating system for intermediate-freuqncy signal frequency stabilization Download PDFInfo
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- CN108390250A CN108390250A CN201810115202.9A CN201810115202A CN108390250A CN 108390250 A CN108390250 A CN 108390250A CN 201810115202 A CN201810115202 A CN 201810115202A CN 108390250 A CN108390250 A CN 108390250A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of feedback devices and laser generating system for intermediate-freuqncy signal frequency stabilization, the feedback device includes signal acquisition module, signal processing module, motor drive module and stepper motor, and signal acquisition module is used to acquire the IF signal frequency generated after the sharp combiner exported by multiple lasers and is converted into electrical signal of the frequency；Signal processing module input terminal is connected with the output end of signal acquisition module, for obtaining motor control signal according to electrical signal of the frequency and expected frequency；Motor drive module input terminal is connected with the output end of signal processing module, for being amplified processing output stepper motor drive signal to motor control signal；Step motor control end is connected with the output end of motor control module, its output shaft is used for long with the chamber of each laser by transmission mechanism change, change each laser output laser frequency, to realize that large-scale chamber length is adjusted, realizes the stabilization of multi-station laser intermediate frequency.
Description
Technical field
The invention belongs to laser frequency control technology field, more particularly, to a kind of for intermediate-freuqncy signal frequency stabilization
Feedback device and laser generating system.
Background technology
Development due to laser technology and maturation, due to the good monochromaticjty of laser itself and propagation performance, laser and
For system around its composition in engineering, the good application that the every field of scientific research is all realized has vast potential for future development.
In many occasions, more powerful, more rich function may be implemented in the mutual cooperation of multi-station laser, at this time often
The frequency of single laser itself is being not the amount it is desirable that care, and the intermediate frequency letter that beam is formed is closed between multi-station laser
Number, entrained by phase information be only our demands, at this time if intermediate-freuqncy signal cannot effective frequency stabilization, frequency-selecting can be caused
Difficulty in processing, and huge error is brought to required signal, largely effect on the realization of system function.And in many places
Be limited to specific environment, can not long-time manual control keep the stabilization of laser (often harsh environment be exactly that selection is sharp
Light is come the reason of realizing required engineering to be achieved or research objectives), automatic feedback control is with regard to particularly important at this time.
In order to realize that the chamber length for capableing of feedback control laser in special experimental place realizes that frequency stabilization, the laser of production are past
Toward all carry included frequency feedback or can be external the ports PZT carry out feedback regulation extension, PZT for laser user
It is a kind of advanced piezoceramic material, it is sensitive to the voltage value of application thereon, the pressure deformation of corresponding voltage value is generated, extensively
The general chamber length for laser is accurate to be adjusted.And the reponse system of the intermediate frequency frequency stabilization of PZT control chambers length can be limited to PZT piezoelectricity pottery
The deformation range of ceramic material, achievable function are limited.
Invention content
In view of the foregoing drawbacks, the present invention provides a kind of feedback device and laser generating system for intermediate-freuqncy signal frequency stabilization,
Aim to solve the problem that existing feedback device due to adjusting the technical problem for causing adjustable range too small using PZT.
As an aspect of of the present present invention, the present invention provides a kind of feedback devices for intermediate-freuqncy signal frequency stabilization, including：
Signal acquisition module, the frequency for acquiring the intermediate-freuqncy signal generated after the sharp combiner exported by multiple lasers
And it is converted into electrical signal of the frequency；
Signal processing module, input terminal are connected with the output end of signal acquisition module, for according to electrical signal of the frequency and
Expected frequency obtains motor control signal；
Motor drive module, input terminal with signal processing module output end connect, for motor control signal into
Row enhanced processing exports stepper motor drive signal；
Stepper motor, control terminal are connected with the output end of motor control module, and output shaft is for passing through transmission mechanism
Change is long with the chamber of each laser, changes each laser output laser frequency, realizes that IF signal frequency is stablized.
Preferably, which further includes isolation module, be connected to signal acquisition module and signal processing module it
Between, for avoiding signal cross-talk between signal acquisition module and signal processing module.
Preferably, which further includes amplification module, be connected to signal isolation module and signal processing module it
Between, for being amplified processing to electrical signal of the frequency.
Preferably, which further includes light-coupled isolation module, is connected to signal processing module and motor control mould
Between block, for converting motor control signal to optical signal, then different voltages grade motor control letter is converted optical signal into
Number, it realizes voltage matches between signal processing module and motor control module, avoids signal processing module and motor control module
Between signal cross-talk.
Preferably, drive mechanism is shaft coupling or gear structure.
As another aspect of the present invention, the present invention provides a kind of laser generation system, including：
Feedback device, multiple lasers and bundling device；The output end of one laser connects with an input terminal of bundling device
It connects, the output end of bundling device is connected with the input terminal of feedback device；The chamber of one same laser of output end of feedback device is long
Control terminal connects；
Wherein, the input terminal of feedback device is the input terminal of signal acquisition module, and the output end of feedback device is that transmission is tied
One transmission output of structure.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
Feedback device provided by the invention is grown Mechanical course laser chamber by stepper motor and is adjusted, spirit may be implemented
Start and stop living are realized by the output duration and single pulse period fixed step angle of pwm signal to motor rotation angle
Regulation and control can be matched with the artificial mechanism adjusting knob of laser, or be directly embedded into laser sheet by hitch bar
Body forms built-in machine feedback control structure, to realize that large-scale chamber length is adjusted, realizes the steady of multi-station laser intermediate frequency
It is fixed.
Description of the drawings
Fig. 1 is the structural schematic diagram of laser generating system provided by the invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the structural schematic diagram of laser generating system provided by the invention.The laser generating system includes multiple laser
Device, for laser for emitting laser signal, the laser signal emitted by multiple lasers exports intermediate frequency after closing beam via bundling device
Signal.By signal acquisition module 1, acquisition optical signal, the optical signal acquired refer to that multi-station laser output optical signal closes in real time
The intermediate-freuqncy signal obtained after and, signal acquisition module 1 have used the planar diode frequency mixer that can acquire optical signal in real time, should
The frequency mixer of type can will collect optical signal and be converted to obtain the voltage signal containing IF frequency information, and the electric signal is logical
It crosses terminal and is input to signal isolation module 2, signal isolation module 2 is optical coupling isolator, for carrying out letter to signal acquisition module
Number isolation, avoid the crosstalk of signal between signal acquisition module and subsequent module.The same signal of output end of signal isolation module 2
The input terminal of amplification module 3 connects, signal amplification module 3 by be added the complete pair signals of bias voltage circuit 1.5V it is inclined
It sets, realizes to being used to be amplified processing to intermediate-freuqncy signal.Due to being signal biasing, its frequency spectrum and the letter of phase are not interfered with
Breath, while peripheral hardware 0~3.3V pins in its ADC piece by dsp chip being allow to read.
The output end of signal amplification module 3 is connected with the input terminal of signal processing module 4, and signal processing module 4 passes through DSP
Chip and its peripheral hardware are realized.Dsp chip has selected the TMS320F2812 chips of TI companies.It is measured according to experiment using dsp chip
The functional relation that is biased with IF signal frequency of the long regulated quantity of resonator, write DSP calculation procedures, and will collect
Intermediate-freuqncy signal carries out FFT, and frequency-selecting obtains practical IF frequency and the difference of target frequency, long according to laser frequency corresponding cavity
Curve obtains needing the long variable quantity of resonator that adjusts, obtain the pwm signal for the certain time length that motor is controlled with
And motor stepping direction signal, and signal is exported by DAC chip output port.
Above-mentioned laser generating system further includes sequentially connected light-coupled isolation module 5, motor control module 6, stepper motor 7
And coupling structure 8, wherein the output end of signal processing module 4 is connected with the input terminal of light-coupled isolation module 5, light-coupled isolation mould
Block 5 is different with the voltage class of DSP for the voltage class of motor control module, is on the one hand used for voltage matches, amplification control
On the other hand the control module of dsp chip and stepper motor is isolated in signal by light-coupled isolation module, play two circuits of isolation
Effect.The signal exported by signal processing module 4 enters light-coupled isolation module 4 by circuit, passes through built-in optocoupler member
Device carries out dsp chip and expands the isolation of external DAC output component and motor control module 5, while being put by fixed proportion
Big input, amplitude are the pwm signal and step direction signal of 3.3V, and 3.3V or 0V correspond to different step directions, keep it suitable
Input for motor control module.Meanwhile motor control module, by being read out processing to control signal, output is directly made
For the voltage of stepping motor electrode, driving motor rotation, 6 electrode of stepper motor is powered, execution cycle stepping, while can be with
Levels of sub division is set on the motor driver in motor control module, the waveform of voltage is controlled according to the user's choice
It realizes specific different subdivision function, accurately controls stepper motor corner.When pwm signal interrupts, stepper motor equally stops, electricity
Machine shaft completes the rotation of required angle, and stepper motor realizes rotor stepping in one direction by electrode alternate energisation, real
Existing PWM electric signals are converted into mechanical angle output, and shaft coupling drive mechanism includes multiple transmission outputs, each transmission output
The mechanical button connection of the chamber length control of the same laser, laser chamber is driven by the step angle of motor by shaft coupling
The mechanical knob of long control, or it is directly long by constructing each laser chamber of geared system change of transmission.
The present invention carries out large range of automatic feedback control using stepper motor and shaft coupling drive mechanism to chamber length, passes through
Signal acquisition module acquires intermediate-freuqncy signal, and the offset of intermediate frequency is calculated by signal processing module, and exports the PWM and motor of needs
Direction signal, motor control part change chamber by obtained motor control signal driving motor by motor and transmission system
Long size realizes that intermediate frequency returns to target frequency, achievees the effect that frequency stabilization.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of feedback device for intermediate-freuqncy signal frequency stabilization, which is characterized in that including：
Signal acquisition module (1), the frequency for acquiring the intermediate-freuqncy signal generated after the sharp combiner exported by multiple lasers
And it is converted into electrical signal of the frequency；
Signal processing module (4), the output end connection of the same signal acquisition module of input terminal (1), for according to electrical signal of the frequency
Motor control signal is obtained with expected frequency；
Motor drive module (6), the output end connection of the same signal processing module of input terminal (4), for motor control signal
It is amplified processing output stepper motor drive signal；
Stepper motor (7), the output end connection of the same motor control module of control terminal (6), output shaft is for passing through driver
The chamber that structure (8) changes each laser is long, changes each laser output laser frequency, realizes that IF signal frequency is stablized.
2. feedback device as described in claim 1, which is characterized in that the feedback device further includes isolation module (2), connection
Between signal acquisition module (1) and signal processing module (4), for avoiding signal acquisition module (1) and signal processing module
(4) signal cross-talk between.
3. feedback device as claimed in claim 2, which is characterized in that the feedback device further includes signal amplification module (3),
It is connected between signal isolation module (2) and signal processing module (4), for being amplified processing to electrical signal of the frequency.
4. feedback device as described in any one of claims 1 to 3, which is characterized in that the feedback device further includes light-coupled isolation
Module (5) is connected between signal processing module (4) and motor control module (6), for converting motor control signal to
Optical signal, then different voltages grade motor control signal is converted optical signal into, realize signal processing module (4) and motor control
Voltage matches between module (6) avoid signal cross-talk between signal processing module (4) and motor control module (6).
5. such as Claims 1-4 any one of them feedback device, which is characterized in that drive mechanism (8) is shaft coupling or gear
Structure.
6. a kind of laser generation system based on feedback device described in claim 1, which is characterized in that including：
Feedback device, multiple lasers and bundling device；The output end of one laser is connected with an input terminal of bundling device, is closed
The output end of beam device is connected with the input terminal of feedback device；The long control terminal of chamber of one same laser of output end of feedback device
Connection；
Wherein, the input terminal of feedback device is the input terminal of signal acquisition module, and the output end of feedback device is drive mechanism
One transmission output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810115202.9A CN108390250A (en) | 2018-02-06 | 2018-02-06 | A kind of feedback device and laser generating system for intermediate-freuqncy signal frequency stabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810115202.9A CN108390250A (en) | 2018-02-06 | 2018-02-06 | A kind of feedback device and laser generating system for intermediate-freuqncy signal frequency stabilization |
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| CN108390250A true CN108390250A (en) | 2018-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810115202.9A Pending CN108390250A (en) | 2018-02-06 | 2018-02-06 | A kind of feedback device and laser generating system for intermediate-freuqncy signal frequency stabilization |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167660A (en) * | 2014-08-07 | 2014-11-26 | 华中科技大学 | Control method and system of laser set |
| CN106159668A (en) * | 2016-09-07 | 2016-11-23 | 上海理工大学 | A kind of repetition rate locking device and method |
-
2018
- 2018-02-06 CN CN201810115202.9A patent/CN108390250A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167660A (en) * | 2014-08-07 | 2014-11-26 | 华中科技大学 | Control method and system of laser set |
| CN106159668A (en) * | 2016-09-07 | 2016-11-23 | 上海理工大学 | A kind of repetition rate locking device and method |
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Application publication date: 20180810 |