CN105591270A - Laser modulation system - Google Patents
Laser modulation system Download PDFInfo
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- CN105591270A CN105591270A CN201410654116.7A CN201410654116A CN105591270A CN 105591270 A CN105591270 A CN 105591270A CN 201410654116 A CN201410654116 A CN 201410654116A CN 105591270 A CN105591270 A CN 105591270A
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Abstract
The present invention belongs to the laser modulation technology, and especially relates to a laser frequency and power modulation system. A laser modulation system of the present invention comprises an acoustic optical modulator, a voltage controlled attenuation module, a digital phase-locked loop, a sequential control module, a radio frequency switch, a photoelectric detector, a servo circuit and a spectroscope; wherein the voltage controlled attenuation module, the radio frequency switch, the acoustic optical modulator, the spectroscope, the photoelectric detector and the servo circuit are arranged in order to form a closed loop, one output of the sequential control module is directly connected with the radio frequency switch, and the other output of the sequential control module is connected with the digital phase-locked loop, while the digital phase-locked loop is connected with the voltage controlled attenuation module; in addition, the acoustic optical modulator not only receives a radio frequency signal of the radio frequency switch, but also receives laser. The laser modulation system of the present invention controls the radio frequency switch through programming of the sequential control module to achieve sequential control for laser, and simultaneously can achieve control for frequency shift amount of laser frequency, and can obtain optical power with high stability through a feedback system.
Description
Technical field
The invention belongs to laser modulation technique, be specifically related to a kind of laser frequency and power modulation system.
Background technology
Laser instrument come out since, the application of laser spreaded all over work, agriculture, scientific research, national defence etc. eachField, laser technology becomes contemporary development speed, the wider technological means of application.
The cold atom research field that develops into of laser technology is brought important breakthrough, and laser-cooling technology becomesFor the important means of cold atom research field, semiconductor laser is the cooling main tool of laser,In the experimental systems such as cold atom gyro, atomic fountain, bose einstein condensation, conventionally use halfConductor laser is realized the cooling of atom or is handled atom. For example, while using Magneto-Optical Trap Trapping of Atoms,Cooling light and back suction fortune light have respectively different frequency detunings, test at bose einstein condensationIn device, atom is will be successively cooling through Magneto-Optical Trap, polarization gradient is cooling, four utmost point magnetic wells are cooling,The processes such as evaporative cooling, therefore need laser break-make, shift frequency amount etc. to carry out the control in sequential.
In addition, for cold atom experimental system, the stability of laser power is critical indexOne of parameter. The factor such as variations in temperature, vibration can affect the stability of laser output power, swashsThe fluctuation meeting of luminous power has heat effect to atom, brings extra noise, therefore cold atom simultaneouslyIn experimental system, the stability of laser power is had to higher requirement.
Summary of the invention
The object of the invention is: provide one can improve laser power stability, and can realize sharpThe modulating system of light shift frequency.
Technical solution of the present invention: a kind of Laser Modulation system, it comprises acousto-optic modulator 2, voltage-controlledAttenuation module 6, digital phase-locked loop 7, time-sequence control module 8, RF switch 9, photodetector4, servo circuit 5, spectroscope 3, wherein, described voltage-controlled attenuation module 6, RF switch 9, soundOptical modulator 2, spectroscope 3, photodetector 4 and servo circuit 5 arrange in turn, and formation is closedRing, and time-sequence control module 8 one tunnel outputs directly connect RF switch 9, one road linking number letter locksEncircle mutually 7, and digital phase-locked loop 7 connects voltage-controlled attenuation module 6, in addition, described acousto-optic modulator 2Except the radiofrequency signal of received RF switch 9, also receive laser.
Between described RF switch 9 and acousto-optic modulator 2, be provided with the merit of amplifying for radiofrequency signalRate amplifier 10.
Described digital phase-locked loop comprise R frequency divider 13, Fractional-N frequency device 12, digital phase detection module 15,Low pass filter 16, voltage controlled oscillator 11, local oscillator 14, wherein, R frequency divider 13 is defeatedGoing out to be connected to digital phase detection module 15, digital phase detection module 15 connects voltage-controlled through low-pass filtering moduleOscillator 11, Fractional-N frequency device 12 connects voltage controlled oscillator 11 and digital phase detection module 15, and this locality shakesSwing device 14 and be connected to R frequency divider 13, in addition, described R frequency divider 13, Fractional-N frequency device 12 are equalBe connected with time-sequence control module 8.
Described servo circuit 5 comprises reference voltage module 17, photoelectricity sampling module 18, differential amplificationDevice 19, direct current biasing module 20, adder 21, wherein, photoelectricity sampling module 18 and reference electricityDie block 17 is connected with the positive and negative terminal of difference amplifier 19 respectively, direct current biasing module 20 and differenceThe output of amplifier 19 is connected to adder 21 positive-negative input ends.
The interior R frequency divider of TTL signal controlling digital phase-locked loop 7 sending by time-sequence control module 813 and Fractional-N frequency device 12, the rf frequency of this digital phase-locked loop output, thereby realize laserShift frequency.
Technique effect of the present invention: Laser Modulation system of the present invention is by the time-sequence control module control of programmingRF switch processed is realized the SECO to laser, can realize the control to laser shift frequency amount simultaneously,And obtain the luminous power of higher stability by feedback loop system.
Brief description of the drawings
Fig. 1 is the theory diagram of Laser Modulation system of the present invention;
Fig. 2 is digital phase-locked loop theory diagram;
Fig. 3 is power control circuit block diagram;
Wherein, 1-semiconductor laser, 2-acousto-optic modulator, 3-spectroscope, 4-photodetector,5-servo circuit, the voltage-controlled attenuation module of 6-, 7-digital phase-locked loop, 8-time-sequence control module, 9-radio frequencySwitch, 10-power amplifier, 11-voltage controlled oscillator, 12-N frequency divider, 13-R frequency divider, 14-Local oscillator, 15-digital phase discriminator, 16-low pass filter, 17-reference voltage module, 18-Photoelectricity sampling signal, 19-differential amplification module, 20-direct current biasing module, 21-adder
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described:
Refer to Fig. 1, Laser Modulation system of the present invention comprises acousto-optic modulator 2, voltage-controlled attenuation module6, digital phase-locked loop 7, time-sequence control module 8, RF switch 9, photodetector 4, servo electricityRoad 5, spectroscope 3, wherein, described voltage-controlled attenuation module 6, RF switch 9, acousto-optic modulator2, spectroscope 3, photodetector 4 and servo circuit 5 arrange in turn, form closed loop, and timeThe 8 one tunnel outputs of order control module directly connect RF switch 9, one tunnels and connect digital phase-locked loop 7, andDigital phase-locked loop 7 connects voltage-controlled attenuation module 6.
Between described RF switch 9 and acousto-optic modulator 2, be provided with the merit of amplifying for radiofrequency signalRate amplifier 10.
In addition, described acousto-optic modulator 2, except the radiofrequency signal of received RF switch 9, also receivesLaser, in the present invention, concrete case study on implementation adopts semiconductor laser 1 as light source. Radiofrequency signalAfter input acousto-optic modulator 2, make laser frequency produce shift frequency, the frequency size decision sound of radiofrequency signalThe shift frequency amount of optical modulator Output of laser, the diffraction effect of the power decision acousto-optic modulator of radiofrequency signalRate, that is to say the power of Output of laser.
The present invention mainly realizes by described acousto-optic modulator 2 control of laser shift frequency amount.Programmable digital phased lock loop 7 drives as acousto-optic modulator, controls by time-sequence control module 8The frequency of digital phase-locked loop output radiofrequency signal, controls the logical of radiofrequency signal by RF switch 9Disconnected, time-sequence control module 8 provides the TTL signal of RF switch 9 simultaneously, therefore by sequential controlMolding piece can be realized the SECO able to programme to digital phase-locked loop output frequency, that is to say realizationTo the SECO able to programme of laser shift frequency amount.
The present invention is mainly to decline in conjunction with voltage-controlled by servo circuit 5 to the control of laser intensity stabilitySubtract that module 6 realizes. Photodetector 4 exploring laser light light intensity, obtain the information that laser fluctuates,Provide error signal by servo circuit 5, error signal is given to voltage-controlled attenuation module 6, is used for changingThe power that becomes the radiofrequency signal that is given to acousto-optic modulator 2, the change of radiofrequency signal power makes acousto-opticThe change of modulator diffraction power, when laser power is during lower than reference value, error signal just providesVoltage, voltage-controlled attenuation module output signal power is raise, thereby acousto-optic modulator is spread outPenetrating luminous power improves; When laser power is during higher than reference value, error signal provides negative voltage, makesObtain voltage-controlled attenuation module output signal power and reduce, thereby acousto-optic modulator diffraction power is fallenLow, by this feedback loop by laser power servo-stabilization, thereby realize to laser power stabilityThe control of property.
The frequency of radiofrequency signal, phase jitter directly cause the unstable of modulator diffraction laser frequency,The present invention adopts a kind of digital phase-locked loop as radio frequency generation signal, with what ensure laser shift frequency amountAccurately control.
Described digital phase-locked loop comprise R frequency divider 13, Fractional-N frequency device 12, digital phase detection module 15,Low pass filter 16, voltage controlled oscillator 11, local oscillator 14. Wherein, R frequency divider 13 is defeatedGoing out to be connected to digital phase detection module 15, digital phase detection module 15 connects voltage-controlled through low-pass filtering moduleOscillator 11, Fractional-N frequency device 12 connects voltage controlled oscillator 11 and digital phase detection module 15, and this locality shakesSwing device 14 and be connected to R frequency divider 13. In addition, described R frequency divider 13, Fractional-N frequency device 12 are equalBe connected with time-sequence control module 8. The output frequency of voltage controlled oscillator 11 is f0, through Fractional-N frequencyAfter device 12, obtain frequency f0/ N, local oscillator 14 output signal frequency fL, through R frequency dividerAfter 13, obtaining frequency is fLThe signal of/R, and is input to numeral mirror together with the output of Fractional-N frequency device 12In phase device 15, carry out phase demodulation, the signal after phase demodulation is through obtaining error letter after low pass filter 16Number, error signal is input to voltage controlled oscillator 11 controls the frequency of output.
The driving of acousto-optic modulator in the past adopts VCO to realize more, and VCO output frequency precisionLower, and frequency drift is larger, and the present invention adopts digital phase-locked loop can greatly improve acousto-optic and adjustsThe precision of device output light shift frequency amount processed. Simultaneously, compared with basic phaselocked loop, digital phase-locked loop is logicalCross the frequency that changes frequency dividing ratio N and can change output signal, frequency dividing ratio is compiled by time-sequence control moduleJourney provides, and the technique effect reaching is like this: on can sequential, realize the change of signal frequency, alsoBe in sequential, to control laser shift frequency amount.
Described servo circuit comprises reference voltage module 17, photoelectricity sampling module 18, difference amplifier19, direct current biasing module 20, adder 21, wherein, photoelectricity sampling module 18 and reference voltageModule 17 is connected with the positive and negative terminal of difference amplifier 19 respectively, and direct current biasing module 20 and difference are putThe output signal of large device 19 is connected to adder 21 positive-negative input ends. Photoelectricity sampling signal modeThe sampled voltage that piece 18 obtains and reference voltage module 17 carry out differential amplification, obtain reflecting laserThe error signal of power swing, error signal and direct current biasing module 20, through adder 21, obtainTo control signal, be input to the voltage-controlled end of voltage-controlled attenuation module 6. When open loop, be output as adjustable straightStream bias voltage, is output as error signal and bias voltage sum when closed loop.
Described time-sequence control module 8 one road TTL signals are connected to the control end of RF switch, controlThe break-make of RF switch, and then control inputs is to the break-make of acousto-optic modulator radiofrequency signal, finally controlsThe break-make of acousto-optic modulator diffraction light processed, realizes the control to break-make in laser power sequential. SequentialAnother road of control module TTL signal is connected to digital phase-locked loop, changes dividing of the interior frequency divider of phaselocked loopFrequency ratio, thus the size of exporting radio frequency signal frequency changed, and time-sequence control module is by programming simultaneouslyControl this two-way TTL signal, can realize the control in laser frequency shift frequency amount sequential.
Laser Modulation system of the present invention can well meet the needs of cold atom experimental system, butThe present invention simultaneously is not just confined to cold atom experimental system, is not just confined to semiconductor laser yetDevice.
Claims (6)
1. a Laser Modulation system, is characterized in that, comprises acousto-optic modulator (2), voltage-controlled decliningSubtract module (6), digital phase-locked loop (7), time-sequence control module (8), RF switch (9), lightElectric explorer (4), servo circuit (5), spectroscope (3), wherein, described voltage-controlled attenuation module(6), RF switch (9), acousto-optic modulator (2), spectroscope (3), photodetector (4)And servo circuit (5) arranges in turn, form closed loop, and time-sequence control module (8) one roads are defeatedGo out direct connection RF switch (9), a road connects digital phase-locked loop (7), and digital phase-locked loop (7)Connect voltage-controlled attenuation module (6), in addition, described acousto-optic modulator (2) is except received RF switch (9)Radiofrequency signal outside, also receive laser.
2. Laser Modulation system according to claim 1, is characterized in that, described radio frequency is openedBetween pass (9) and acousto-optic modulator (2), be provided with the power amplifier amplifying for radiofrequency signal(10)。
3. Laser Modulation system according to claim 1, is characterized in that, described digital phase-lockingMutually ring (7) comprise R frequency divider (13), Fractional-N frequency device (12), digital phase detection module (15),Low pass filter (16), voltage controlled oscillator (11), local oscillator (14), wherein, R frequency divisionDevice (13) output is connected to digital phase detection module (15), digital phase detection module (15) through low pass filteredRipple device (16) connects voltage controlled oscillator (11), and Fractional-N frequency device (12) connects voltage controlled oscillator (11)With digital phase detection module (15), local oscillator (14) is connected to R frequency divider (13), in addition,Described R frequency divider (13), Fractional-N frequency device (12) are all connected with time-sequence control module (8).
4. Laser Modulation system according to claim 1, is characterized in that, described servo electricityRoad (5) comprise reference voltage module (17), photoelectricity sampling module (18), difference amplifier (19),Direct current biasing module (20), adder (21), wherein, photoelectricity sampling module (18) and referenceVoltage module (17) is connected with the positive and negative terminal of difference amplifier (19) respectively, direct current biasing module(20) and difference amplifier (19) output be connected to the positive-negative input end of adder (21).
5. Laser Modulation system according to claim 3, is characterized in that, by sequential controlThe interior R frequency divider of TTL signal controlling digital phase-locked loop (7) (13) that molding piece (8) sends andFractional-N frequency device (12), the rf frequency of this digital phase-locked loop output, thus realize the shift frequency to laser.
6. Laser Modulation system according to claim 1, is characterized in that, by sequential controlThe TTL signal controlling RF switch (9) that molding piece (8) sends, realizes acousto-optic modulator (2)The control of input radio frequency signal break-make, thus realize the SECO to laser break-make.
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| CN201410654116.7A CN105591270B (en) | 2014-11-17 | 2014-11-17 | A kind of Laser Modulation system |
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| CN201410654116.7A CN105591270B (en) | 2014-11-17 | 2014-11-17 | A kind of Laser Modulation system |
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| CN105591270B CN105591270B (en) | 2018-08-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200029A (en) * | 2016-09-12 | 2016-12-07 | 中国科学技术大学 | A kind of acousto-optic modulator drive circuit and scan method thereof |
| CN109029740A (en) * | 2018-04-20 | 2018-12-18 | 山西大学 | A kind of device and method measuring atomic hyperfine |
| CN109274259A (en) * | 2018-10-29 | 2019-01-25 | 西安空间无线电技术研究所 | A kind of power switch machine control method, device and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4665524A (en) * | 1984-05-25 | 1987-05-12 | British Telecommunications Plc | Mode locked laser light sources |
| US20100278541A1 (en) * | 2009-04-29 | 2010-11-04 | Instrumentation Technologies D.D. | Optical System for Transfer of Timing Reference |
| US20140186045A1 (en) * | 2012-12-28 | 2014-07-03 | Synergy Microwave Corporation | Self injection locked phase locked looped optoelectronic oscillator |
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2014
- 2014-11-17 CN CN201410654116.7A patent/CN105591270B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4665524A (en) * | 1984-05-25 | 1987-05-12 | British Telecommunications Plc | Mode locked laser light sources |
| US20100278541A1 (en) * | 2009-04-29 | 2010-11-04 | Instrumentation Technologies D.D. | Optical System for Transfer of Timing Reference |
| US20140186045A1 (en) * | 2012-12-28 | 2014-07-03 | Synergy Microwave Corporation | Self injection locked phase locked looped optoelectronic oscillator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200029A (en) * | 2016-09-12 | 2016-12-07 | 中国科学技术大学 | A kind of acousto-optic modulator drive circuit and scan method thereof |
| CN109029740A (en) * | 2018-04-20 | 2018-12-18 | 山西大学 | A kind of device and method measuring atomic hyperfine |
| CN109274259A (en) * | 2018-10-29 | 2019-01-25 | 西安空间无线电技术研究所 | A kind of power switch machine control method, device and application |
| CN109274259B (en) * | 2018-10-29 | 2020-07-14 | 西安空间无线电技术研究所 | Power supply on-off control method, device and application |
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| CN105591270B (en) | 2018-08-24 |
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