CN101800395A - Digitalized laser phase-locking device and phase-locking method - Google Patents
Digitalized laser phase-locking device and phase-locking method Download PDFInfo
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Abstract
The invention discloses a digital laser phase-locking device, which mainly comprises the components of a laser, a beam splitter, a photodetector, a biased junction, a directional coupler, an amplifier, an integrated phase-locked loop frequency synthesizer, an external reference source, a digital PID control module, a computer and the line, wherein the components are connected with a circuit through optical paths to form a whole body of the digitalized laser phase-locking device, and an electrical phase-locked loop is expanded to a laser frequency to lock the phase of the digitalized laser phase-locking device. The digitalized laser phase-locking device adopts the integrated phase-locked loop frequency synthesizer to ensure that controlled difference frequencies are different from one another from dozens of trillions to 7 GHz; the digital PID control module is used for realizing that a computer controls the phase-locking process, adjusts the parameters of the digital PID control module and changes the phase-locking position; and the operation is convenient, the optical paths are simple, and only one beat frequency optical path is needed.
Description
Technical field
The present invention relates to the relative phase lock-in techniques of two lasers, particularly digitlization phase-locking device and phase-locking method.
Background technology
At accurate spectrum, coherent optics is measured, and a lot of fields such as matter wave interferometry and quantum calculation all need two bundle difference on the frequencies laser very accurately.In order to obtain such coherent beam, conventional method is to use acousto-optic frequency shifters (AOM) or electrooptic modulator (EOM), but difference on the frequency is pre-set, selects the acousto-optic frequency shifters or the electrooptic modulator of corresponding frequency band, in case on the frame, be difficult for change.In addition, traditional frequency shifter shift frequency amount is not accomplished very high, and is just very expensive to the AOM of hundreds of megahertz, and high frequency has not just had corresponding frequency shifter again.
The present invention has overcome traditional frequency shifter frequency underaction and the wide inadequately shortcoming of frequency range, the electricity phase-locked loop expanded on the laser frequency, thereby to its phase locking.Be transformed into 100 order of megahertz under the difference frequency of the way of the direct frequency division of employing with two bundle laser on the FREQUENCY CONTROL, in the operation, as long as the change external reference frequency can change the difference frequency between the laser beam, can also revise the frequency division multiple, thereby controlled difference frequency can not wait from tens to several GHzs.Used digitlization proportional-integral-differential (PID) control module among the present invention, realized that by the phase-locked process of computer control, pid regulator parameters changes phase-locked position, and is easy to operate.
Summary of the invention
The object of the invention is for solving a traditional optical frequency shifter fixed-frequency and a not high enough difficult problem, realize the main laser phase lock-in techniques that adopts integrated phase lock frequency synthesizer and digital PID to constitute, widened two bundle frequencies and differed the range of application of laser accurately.
The invention provides the digitalized laser Phase Lock Technique, comprising: the phase-locking method of digitalized laser phase-locking device and digitalized laser phase-locking device.
The invention provides digitalized laser phase-locking device, mainly form by laser as a reference, tunable laser, first beam splitter, second beam splitter, photodetector, bias junctions, directional coupler, amplifier, integrated phase lock frequency synthesizer, external reference source, digital PID control module, computer to be locked, be connected with circuit by light path, constitute digitalized laser phase-locking device integral body, wherein: constitute the beat frequency light path system by the laser of reference, tunable laser, first beam splitter, second beam splitter, photodetector to be locked; Be connected by coaxial cable successively by light photodetector, bias junctions, directional coupler, amplifier and integrated phase lock frequency synthesizer; Integrated phase lock frequency synthesizer, external reference source, digital PID control module connect by coaxial cable; The digital PID control module is connected by coaxial cable with laser, constitutes control circuit system; Control circuit system links to each other with computer, and computer is connected by the USB cable with external reference source, digital PID control module, constitutes computer control system.
Two assemblies of built-in frequency divider of integrated phase lock frequency synthesizer of the present invention and phase frequency detector, deliver to phase frequency detector behind the local oscillation signal frequency division of its frequency divider with input, the signal of its phase frequency detector after and the reference signal working frequency bit comparison mutually from the outside, output error signal with frequency division.
The phase-locking method of digitalized laser phase-locking device of the present invention is: described first beam splitter is got combiner a part of and that second beam splitter is told with the laser of tunable laser output to be locked and is entered photodetector; The laser that described second beam splitter is exported laser as a reference carries out beam splitting, gets a part and enters first beam splitter; Described photodetector converts light intensity signal to the signal of telecommunication and is input to bias junctions; Photodetector is become in described biasing provides direct current biasing, and the gained difference frequency signal is input to directional coupler; The difference frequency signal of described directional coupler automatic biasing in future knot is coupled out fraction and is used for monitoring, major part is input to amplifier; Described amplifier will be sent into the integrated phase lock frequency synthesizer after will amplifying from the difference frequency signal of directed coupler; Two assemblies of built-in frequency divider of described integrated phase lock frequency synthesizer and phase frequency detector, its frequency divider will be delivered to phase frequency detector behind the difference frequency signal frequency division from amplifier, the difference frequency signal of its phase frequency detector after and reference signal working frequency bit comparison mutually from external reference source with frequency division, draw error signal, send into the digital PID control module; Described external reference source is input to the integrated phase lock frequency synthesizer with the radiofrequency signal that oneself produces, as the reference signal of frequency discrimination phase demodulation; Described digital PID control module will be imported laser to be locked from the error signal of integrated phase lock frequency synthesizer after treatment, control its output frequency phase place; The digital PID control module can be done digital communication with computer, can utilize computer to its switch control, regulates parameter, adds biasing, and external reference source has digital interface, by its frequency plot of computer control and scanning etc.
Described digital PID of the present invention carries out digitlization with error signal, does the current controling end and the piezoelectric ceramic control end that feed back to tunable laser to be locked after ratio, integration and differential are handled then.
Described collaborative computer digital PID control module of the present invention and external reference source are controlled phase-locked process, and under lock-out state, finish linearity, the operation of step and index frequency sweep
The mechanism of digitalized laser Phase Lock Technique provided by the present invention is: with reference laser diode with wait that the output light of locking laser respectively gets sub-fraction, take out its difference frequency with photodetector, amplify enough the back to the integrated phase lock frequency synthesizer through amplifier.The integrated phase lock frequency synthesizer is with difference frequency signal elder generation frequency division, and the frequency plot with signal behind the frequency division and external reference source compares then, draws error signal, and the digital PID control module is handled this error signal and fed back to laser, controls its output frequency phase place.Computer control figure pid control module and external reference source in this process.
The invention provides a kind of based on integrated phase lock frequency synthesizer and digital PID control module laser phase lock-in techniques.The electricity principle of phase lock loop is applied to the light frequency scope, uses the integrated phase lock frequency synthesizer that is operated in 7GHz, control the phase place of laser with the filter in the digitlization PID replacement electricity phase-locked loop.Compare with conventional laser shift frequency method, light path is simplified greatly, only needs to survey the beat frequency (being difference frequency) of two light beams, needs the circuit kit control system laser phase can be locked in addition.Can regulate external reference frequency and frequency division multiple, the laser difference frequency is locked in the position of any needs, phase-locking device provided by the invention can realize up to the locking of 7GHz beat frequency phase, can the scan reference frequency in the time of locking, thus the scan laser frequency.Control circuit system links to each other with computer, can regulate digital PID control module parameter by the phase-locked process of computer control, changes phase-locked position, and is simple to operate.
Digitalized laser Phase Lock Technique provided by the present invention expands to the electricity phase-locked loop on the laser frequency, thereby to its phase locking.Adopt the integrated phase lock frequency synthesizer, be transformed into 100 order of megahertz under the difference frequency of the way of the direct frequency division of employing with two bundle laser on the FREQUENCY CONTROL, in the operation, as long as the change external reference frequency can change the difference frequency between the laser beam, can also revise the frequency division multiple, thereby controlled difference frequency can not wait from tens to 7GHz.Used digitlization proportional-integral-differential (PID) control module among the present invention, realized that by the phase-locked process of computer control, pid regulator parameters changes phase-locked position, and is easy to operate.Also very simple on the light path, only need a beat frequency light path.
Description of drawings
Accompanying drawing 1 is the schematic diagram of digitalized laser phase-locking device
Embodiment
Embodiment 1:
Referring to accompanying drawing 1, the invention provides digitalized laser phase-locking device, mainly by as a reference laser 1, tunable laser 2 to be locked, first beam splitter 3, second beam splitter 4, photodetector 5, bias junctions 6, directional coupler 7, amplifier 8, integrated phase lock frequency synthesizer 9, external reference source 10, digital PID control module 11, computer 12 is formed, be connected with circuit by light path, constitute digitalized laser phase-locking device integral body, wherein: photodetector 5, bias junctions 6, directional coupler 7, amplifier 8 is connected by the high-performance coaxial cable successively with integrated phase lock frequency synthesizer 9; Integrated phase lock frequency synthesizer 9, external reference source 10, digital PID control module 11 connect by coaxial cable; Digital PID control module 11 and laser 2 are connected by coaxial cable, and computer 12 is connected by the USB cable with external reference source 10, digital PID control module 11.
Described output frequency tunable laser 2 to be locked, the frequency non-locking is subjected to the control of external voltage signal, changes the parameter of its operating current resonant cavity, frequency that can tuning within the specific limits output laser.
Described first beam splitter 3 is a kind ofly can and close the optical element of bundle with laser beam splitter, and stronger is a branch of as output, more weak a branch of conduct and be merged into a branch of photodetector 5 of giving from the more weak bundle of beam splitter 4.
Described second beam splitter 4 is a kind ofly can and close the optical element of bundle with laser beam splitter, and stronger is a branch of as output, and more weak a branch of beam splitter 3 of being defeated by closes bundle.
Described photodetector 5 converts light intensity signal to the signal of telecommunication, generally needs the outside that direct current biasing is provided.
Described bias junctions 6 provides direct current biasing for various photodetectors.
Described directional coupler 7 is coupled out fraction with signal and is used for monitoring, major part is exported.
Described amplifier 8 is pressed nominal gain with signal and is amplified.
Described integrated phase lock frequency synthesizer 9 built-in frequency dividers and two assemblies of phase frequency detector, deliver to phase frequency detector behind the local oscillation signal frequency division of its frequency divider with input, the signal of its phase frequency detector after and reference signal working frequency bit comparison mutually from the outside with frequency division, output error signal, frequency divider maximum operating frequency 7GHz wherein, regulate the frequency division multiple with wire jumper or TTL switching signal, phase frequency detector is a digital frequency phase detector, maximum operating frequency 1.3GHz.
Described external reference source 10 is a kind of frequency generators, can produce various frequency signals, and is general as using with reference to signal, can be connected with computer.
Described digital PID control module after ratio, integration and differential processing, outputs to controlled object at first with the error signal digitlization, generally can be connected with computer.
The phase-lock technique of digitalized laser phase-locking device is: described first beam splitter 3 is got combiner a part of and that second beam splitter 4 is told with the laser of tunable laser to be locked 2 outputs and is entered photodetector 5; The laser that described second beam splitter 4 is exported laser 1 as a reference carries out beam splitting, gets a part and enters first beam splitter 3; Described photodetector 5 and bias junctions 6 are formed detection system, detect the difference frequency of two laser, and photodetector 5 is that difference frequency signal converts the signal of telecommunication to light intensity signal, is input to bias junctions 6; Described bias junctions 6 provides direct current biasing for photodetector 5, and the gained difference frequency signal is input to directional coupler 7; The difference frequency signal of described directional coupler automatic biasing knot in 7 future 6 is coupled out fraction and is used for monitoring, major part is input to amplifier 8; Described amplifier 8 will be sent into integrated phase lock frequency synthesizer 9 after will amplifying from the difference frequency signal of directed coupler 7; Described integrated phase lock frequency synthesizer 9 built-in frequency dividers and two assemblies of phase frequency detector, its frequency divider will be delivered to phase frequency detector behind the difference frequency signal frequency division from amplifier 8, the difference frequency signal of its phase frequency detector after and reference signal working frequency bit comparison mutually from external reference source 10 with frequency division, draw error signal, send into digital PID control module 11; Described external reference source 10 is input to integrated phase lock frequency synthesizer 9 with the radiofrequency signal that oneself produces, as the reference signal of frequency discrimination phase demodulation; After described digital PID control module 11 will be handled through ratio, integration and differential from the error signal of integrated phase lock frequency synthesizer 9, input waited to lock laser 2, controls its output frequency phase place.Described computer 12 control figure pid control modules 11 are opened and are turn-offed and regulate its parameter, add operations such as biasing, the output frequency phase place of control external reference source 10, and control its frequency sweep etc.
Claims (5)
1. digitalized laser phase-locking device, mainly form by reference laser diode (1), tunable laser (2), first beam splitter (3), second beam splitter (4), photodetector (5), bias junctions (6), directional coupler (7), amplifier (8), integrated phase lock frequency synthesizer (9), external reference source (10), digital PID control module (11), computer (12) to be locked, be connected with circuit by light path, constitute digitalized laser phase-locking device integral body; It is characterized in that: constitute the beat frequency light path system by reference laser diode (1), tunable laser (2), first beam splitter (3), second beam splitter (4), photodetector (5) to be locked; Be connected by coaxial cable successively by photodetector (5), bias junctions (6), directional coupler (7), amplifier (8) and integrated phase lock frequency synthesizer (9), integrated phase lock frequency synthesizer (9), external reference source (10), digital PID (11) connect by coaxial cable, digital PID control module (11) is connected by coaxial cable with laser (2), constitutes control circuit system; Control circuit system links to each other with computer (12), and computer (12) is connected by the USB cable with external reference source (10), digital PID control module (11), constitutes computer control system.
2. digitalized laser phase-locking device according to claim 1, it is characterized in that: two assemblies of built-in frequency divider of described integrated phase lock frequency synthesizer (9) and phase frequency detector, frequency divider maximum operating frequency 7GHz wherein, regulate the frequency division multiple with wire jumper or TTL switching signal, phase frequency detector is a digital frequency phase detector, maximum operating frequency 1.3GHz.
3. the phase-locking method of the described digitalized laser phase-locking device of claim 1 is characterized in that: described first beam splitter (3) is got the combiner that a part and second beam splitter (4) tell with the laser of tunable laser (2) output and is entered photodetector (5); Described second beam splitter (4) carries out beam splitting with the laser of reference laser diode (1) output, gets a part and enters first beam splitter (3); Described photodetector (5) converts light intensity signal to the signal of telecommunication, and promptly the difference frequency signal of laser (1) and laser (2) is input to bias junctions (6); Described bias junctions (6) provides direct current biasing for photodetector (5), and the gained difference frequency signal is input to directional coupler (7); The difference frequency signal of described directional coupler (7) automatic biasing knot in future (6) is coupled out fraction and is used for monitoring, major part is input to amplifier (8); Described amplifier (8) will be sent into integrated phase lock frequency synthesizer (9) after will amplifying from the difference frequency signal of directed coupler (7); Two assemblies of built-in frequency divider of described integrated phase lock frequency synthesizer (9) and phase frequency detector, its frequency divider will be delivered to phase frequency detector behind the difference frequency signal frequency division from amplifier (8), the difference frequency signal of its phase frequency detector after and reference signal working frequency bit comparison mutually from external reference source (10) with frequency division, draw error signal, send into digital PID control module (11); Described external reference source (10) is input to integrated phase lock frequency synthesizer (9) with the radiofrequency signal that oneself produces, as the reference signal of frequency discrimination phase demodulation; Described digital PID control module (11) will be imported tunable laser (2) to be locked from the error signal of integrated phase lock frequency synthesizer (9) after treatment, control its output frequency phase place; Digital PID control module (11) and computer (12) carry out digital communication, utilize computer (12) to its switch control, regulate parameter, add biasing, and external reference source (10) has digital interface, controls its frequency plot and scanning by computer (12).
4. digitalized laser phase-locking device phase-lock technique according to claim 3, it is characterized in that: described digital PID control module (11) is carried out digitlization with error signal, feeds back to the current controling end and the piezoelectric ceramic control end of tunable laser to be locked (2) after handling through ratio, integration and differential.
5. phase-lock technique according to claim 3 is characterized in that: described computer (12) cooperative digital pid control module (11) and external reference source (10), control phase-locked process, and under lock-out state, finish linearity, the operation of step and index frequency sweep.
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| CN102829812A (en) * | 2012-08-22 | 2012-12-19 | 哈尔滨工业大学 | Brillouin optical time domain analysis meter capable of locking frequencies of two lasers based on optical phase-locked loop |
| CN104409960A (en) * | 2014-11-26 | 2015-03-11 | 山西大学 | Automatic laser frequency stabilizing device and method |
| CN104833380A (en) * | 2015-04-22 | 2015-08-12 | 江苏骏龙电力科技股份有限公司 | Light frequency scanning non-linear calibration system |
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