CN109343292A - A kind of optical frequency com based on locking phase principle - Google Patents
A kind of optical frequency com based on locking phase principle Download PDFInfo
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- CN109343292A CN109343292A CN201811430853.3A CN201811430853A CN109343292A CN 109343292 A CN109343292 A CN 109343292A CN 201811430853 A CN201811430853 A CN 201811430853A CN 109343292 A CN109343292 A CN 109343292A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
-
- 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
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
The present invention relates to a kind of optical frequency coms based on locking phase principle, including reference source module, waveform-shaping module, photoelectric conversion module, main controller module, drive module and tunable optical source.It is used to generate the reference clock signal of high stability with reference to source module；The waveform shaping of waveform-shaping module completion feedback signal；Photoelectric conversion module is used to the output signal of laser being converted to electric signal；Main controller module for realizing locking phase correlation function；Drive module is for driving sports apparatus relevant to laser；Tunable optical source is for generating final repetition signal.The present invention is using the Rb clock of high stable as reference source, the Rb clock have passed through space flight verifying, reliable performance, it is strong relative to traditional super stabilized laser device environmental suitability of optics and lower to the technique requirement super stabilized laser device of opposing optical, it is easy to the widespread adoption in space.
Description
Technical field
The present invention relates to laser technology fields, are related to a kind of optical frequency based on locking phase principle realized based on FPGA
Comb.
Background technique
Optical frequency com is mainly used in the wavelength calibration of optical frequency measurement, absolute distance measurement and celestial spectrum
Equal fields.Its structure is complicated for traditional frequency comb, it is bulky, expensive, be difficult to safeguard and severe to operating environment requirements
It carves, it is difficult to adapt to the demand that fields of measurement is continuously measured to easy operation and for a long time.
In laser frequency stabilization field, commonly steady frequency approach has saturated absorption frequency stabilization, double-colored frequency stabilization, Modulation Transfer steady at present
The methods of frequency and passive cavity frequency stabilization.Frequency-stabilizing method common at present is PDH frequency-stabilizing method, realizes optics phase demodulation using optical system
Deng operation.Above-mentioned frequency-stabilizing method has a determining frequency values, i.e., finally stabilised laser frequency is all in atomic spectral line
On certain formant or on a certain vertical film of passive cavity, it is inflexible that frequency is relatively fixed.And high stability used in optics frequency stabilization
Super steady chamber system structure it is complicated, when facing space application, optical system will meet stability, impact resistance and light want
It asks, leads to design difficulty and increased costs.In frequency comb described in this patent laser possess adjustable stepper motor and
PZT, need to only modify to the fpga logic in controller can be realized the frequency stabilization of different frequency, therefore flexibility is higher, can
Stable frequency range is big.The reference source of the design is Rb clock simultaneously, and space application relative maturity, relatively super steady chamber system more can
Adapt to the application requirement of space environment.Most of traditional optical system laser phase-locked is all to carry out phase demodulation using optical system,
And this patent is that optical signal is carried out to photoelectric conversion, carries out digital phase detection to the signal after conversion, is improved in space application
Adaptability.
Summary of the invention
The present invention is to solve existing laser frequency stabilizing system to environmental requirement height, and optical system installation is complicated, and frequency is fixed etc.
Problem locks the output repetition of laser as reference source using Rb clock, and realizes PID by reconfigurable FPGA
With the functions such as digital phase detection.The change to systematic entirety energy and parameter can be realized by the change to FPGA.It reduces to ring
The sensibility in border can adapt to current space environment application demand.
Optical frequency com based on locking phase principle of the invention, including reference source module, waveform-shaping module, photoelectric conversion
Module, main controller module, drive module and tunable optical source.The reference for being used to generate high stability with reference to source module
Clock signal；The waveform-shaping module completes the waveform shaping of feedback signal；The photoelectric conversion module is used for laser
Output signal be converted to electric signal；Main controller module for realizing locking phase correlation function；Drive module for drive with
The relevant sports apparatus of laser；Tunable optical source is for generating final repetition signal.
The wherein electric signal and waveform shaping with reference to source module output and laser output signal after photoelectric conversion module
Module is connected, and the output of waveform-shaping module is connected with main controller module, and master controller is connected with drive module, drive module
The component for controlling laser influences the output frequency of laser.
As further limiting, described includes the Rb clock and related support circuit of a fixed frequency with reference to source module,
Rb clock output frequency is 50M, is better than ± 5 × 10 under frequency accuracy rate vacuum environment-10, drift rate≤1 × 10-12/ day, it is unilateral
Band phase noise maximum≤- 100dBc/Hz@10Hz it is minimum≤- 160dBc/Hz@10kHz.
As further limiting, the waveform-shaping module includes voltage comparator, and Rb clock and laser are passed through photoelectricity
Waveform shaping after converting is the square wave of equal duty ratio.
As further limiting, the photoelectric conversion module includes electrooptical device and interlock circuit, is responsible for laser
The signal of device output is converted to electric signal and send waveform shaping circuit.
As further limiting, main controller module is made of FPGA and its peripheral peripheral hardware, is responsible for completion and the phase-locked function
The functions such as relevant frequency dividing, digital phase detection, k value filtering and PI calculating.
As further limiting, the drive module and tunable optical source include servo-system, PZT and light source,
For middle servo-system for driving the long stepper motor of the chamber in light source and mode locking stepper motor, PZT is sharp for finely tuning in light source internal
The chamber of light device is long.
The invention further relates to a kind of laser frequency stabiliz ation methods, and optical signal is carried out photoelectric conversion, carry out to the signal after conversion
Digital phase detection.
Further, the output repetition of laser is locked as reference source using Rb clock, and by reconfigurable
FPGA realize PID and digital phase discrimination function, pass through the change realized to the change of FPGA to systematic entirety energy and parameter.
For the present invention using the Rb clock of high stable as reference source, which have passed through space flight verifying, reliable performance, phase
It is strong for traditional super stabilized laser device environmental suitability of optics and lower to the technique requirement super stabilized laser device of opposing optical, it is easy to
The widespread adoption in space.This patent also realizes the work such as the relevant frequency dividing phase demodulation of locking phase using FPGA simultaneously, reconfigurable
Property it is strong, can realize the lockings of different repetition rates by changing fpga logic.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the schematic illustration of the optical frequency com based on locking phase principle.
Fig. 2 is the circuit theory schematic diagram of the optical frequency com based on locking phase principle.
Fig. 3 is the fpga logic schematic diagram of the optical frequency com based on locking phase principle.
Specific embodiment
As shown in Figure 1, the optical frequency com, which includes at least, refers to source module, photoelectric conversion module, waveform-shaping module, master
Control module, drive module and light source module.Reference source functions of modules is to generate the stable clock signal of frequency plot, and photoelectricity turns
Mold changing block is used to the signal of laser being converted to electric signal, is sine wave for the signal after reference source and photoelectric conversion, because
Sine wave is converted to the square-wave signal of equal duty ratio by waveform-shaping module by this.Main control module function is the ginseng according to input
Signal and the laser output frequency that feeds back to are examined to complete the work such as frequency and phase discrimination.Drive module is driven according to master control calculated result
It moves relevant actuating mechanism and achievees the purpose that frequency locking to influence the output frequency of laser.The property of system is influenced in main control module
Energy parameter can be all modified in logic, and then can make laser locking over different frequencies.Reference source is Rb clock signal,
Frequency is relatively stable and relatively small, low in energy consumption, and the super steady source of opposing optical is lower to processing and technique requirement, thus has
Good integrated level and reliability, and it is small in size, it is low in energy consumption.
It is made of with reference to source module a Rb clock and its peripheral circuit.Rb atomic clock is small in size, at low cost, and power consumption
It is small, it is suitble to space application.The output of the Rb clock module is the sinusoidal signal of standard.
Photoelectric conversion circuit carries out photoelectric conversion using photodiode, and circuit structure is simple, and power consumption is lower.Shaping circuit
It is middle that MAX998 voltage comparable chip is selected to realize the shaping to the sinusoidal signal of input to square-wave signal.
It further include wave plate and the long step of corresponding wave plate stepper motor, chamber other than the optical devices such as optical fiber in light source module
Into motor and PZT.The output modalities that wave plate stepper motor is used to drive wave plate rotation to lock laser；The long stepper motor tune of chamber
The length of the chamber of whole laser is come in a wide range of interior output frequency for changing laser；PZT is used to the output frequency to laser
It is finely adjusted.Wave plate stepper motor is first adjusted when work and carries out mode locking, stablizes the output frequency of laser.After mode locking
The long stepper motor of chamber is adjusted, the resolution ratio of the long stepper motor of chamber is 1.5 microns, finely tunes the output frequency of laser, makes laser
Output frequency PZT work within the scope of.The locking phase in PZT and main control module is utilized after the long stepper motor adjustment of chamber
Function completes final Frequency Locking.
Drive module circuit contains the driving of two servo motors and the driving of PZT, the wherein driving of servo motor
It is realized using only FPGA, and PZT is driven through and carries out DA conversion and then high voltage amplifier to main control module calculated result to drive
Dynamic PZT movement.
Master control FPGA is responsible for completing the correlation function of locking phase, as shown in figure 3, weight as shown in the repetition control FPGA in Fig. 2
Frequency control FPGA includes frequency division module, digital frequency and phase discrimination module, frequency meter module, K value filter module, number PI mould
Block, major state machine and PZT voltage monitoring modular and D/A conversion module.Frequency division module is respectively by the reference clock signal of input
It is divided with laser feedback clock signal, the signal after frequency dividing enters digital frequency phase detector and carries out phase demodulation, number mirror
Frequency phase discriminator uses JK flip-flop type phase frequency detector, and phase demodulation range is 0-2 π.The phase frequency difference of the two is converted into pulse
Signal, and on the one hand k value filter is filtered, reduce because the phase noise that shake generates simultaneously turns the pulse signal again
It is changed to digital output.Digital quantity after K value filtering send digital PI to carry out operation, which is transported using unsigned int
It calculates, individual processing is done to the positive and negative of data.Calculated result is subjected to DA conversion after the completion of operation and subsequent height presses
Greatly.The locking that different frequency is exported to laser may be implemented in frequency division coefficient by modifying frequency divider.And k value filter
Count range also can reset, and change the performance of system.
Claims (9)
1. a kind of optical frequency com based on locking phase principle, it is characterised in that: including
With reference to source module, the reference clock signal of high stability is generated；
Waveform-shaping module, for completing the waveform shaping of feedback signal；
Photoelectric conversion module, for the output signal of laser to be converted to electric signal；
Main controller module, for realizing the correlation function of locking phase；
Drive module, for driving sports apparatus relevant to laser；
Tunable optical source, for generating final repetition signal.
2. the optical frequency com described in accordance with the claim 1 based on locking phase principle, it is characterised in that: described defeated with reference to source module
The electric signal of signal and laser output after photoelectric conversion module is connected with waveform-shaping module out, waveform-shaping module
Output is connected with main controller module, and master controller is connected with drive module, and the component that drive module controls laser influences to swash
The output frequency of light device.
3. the optical frequency com according to claim 2 based on locking phase principle, it is characterised in that: described to refer to source module packet
The Rb clock and related support circuit of a 50M are included, Rb clock output frequency is 50M, is better than ± 5 under frequency accuracy rate vacuum environment
×10-10, drift rate≤1 × 10-12/ day, output power single sideband phase noise maximum≤- 100dBc/Hz@10Hz be minimum≤-
160dBc/Hz@10kHz。
4. the optical frequency com according to claim 2 based on locking phase principle, it is characterised in that: the waveform-shaping module
It is the square wave of equal duty ratio by the waveform shaping of Rb clock and laser after photoelectric conversion including voltage comparator.
5. the optical frequency com according to claim 2 based on locking phase principle, it is characterised in that: the photoelectric conversion module
Including electrooptical device and interlock circuit, it is responsible for the signal that laser exports being converted to electric signal and send waveform shaping circuit.
6. the optical frequency com according to claim 2 based on locking phase principle, it is characterised in that: the main controller module
It is made of FPGA and its peripheral peripheral hardware, is responsible for completing frequency dividing relevant to the phase-locked function, digital phase detection, k value filtering and PI meter
The functions such as calculation.
7. the optical frequency com according to claim 2 based on locking phase principle, it is characterised in that: the drive module and can
Tuning source includes servo-system, PZT and light source, wherein servo-system for drive the long stepper motor of the chamber in light source and
Mode locking stepper motor, PZT are long in the chamber that light source internal is used to finely tune laser.
8. a kind of laser frequency stabiliz ation method, it is characterised in that: optical signal is carried out photoelectric conversion, carries out number to the signal after conversion
Phase demodulation.
9. laser frequency stabiliz ation method according to claim 8, it is characterised in that: using Rb clock as reference source to laser
Output repetition is locked, and realizes PID and digital phase discrimination function by reconfigurable FPGA, real by the change to FPGA
Now to the change of systematic entirety energy and parameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811430853.3A CN109343292A (en) | 2018-11-28 | 2018-11-28 | A kind of optical frequency com based on locking phase principle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811430853.3A CN109343292A (en) | 2018-11-28 | 2018-11-28 | A kind of optical frequency com based on locking phase principle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030179791A1 (en) * | 2002-03-05 | 2003-09-25 | Nakamura Hiroshi | Active wavelength locking |
| CN101800395A (en) * | 2010-03-04 | 2010-08-11 | 浙江大学 | Digitalized laser phase-locking device and phase-locking method |
| CN205748416U (en) * | 2016-06-08 | 2016-11-30 | 江苏骏龙光电科技股份有限公司 | A kind of closed loop anti-phase-locking type laser scanning system |
| 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 |
| CN108039640A (en) * | 2017-12-06 | 2018-05-15 | 中国电子科技集团公司第四十九研究所 | A kind of 795nm laser frequency stabilizing systems and its frequency-stabilizing method |
-
2018
- 2018-11-28 CN CN201811430853.3A patent/CN109343292A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030179791A1 (en) * | 2002-03-05 | 2003-09-25 | Nakamura Hiroshi | Active wavelength locking |
| CN101800395A (en) * | 2010-03-04 | 2010-08-11 | 浙江大学 | Digitalized laser phase-locking device and phase-locking method |
| CN205748416U (en) * | 2016-06-08 | 2016-11-30 | 江苏骏龙光电科技股份有限公司 | A kind of closed loop anti-phase-locking type laser scanning system |
| 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 |
| CN108039640A (en) * | 2017-12-06 | 2018-05-15 | 中国电子科技集团公司第四十九研究所 | A kind of 795nm laser frequency stabilizing systems and its frequency-stabilizing method |
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Application publication date: 20190215 |