CN105591270B - A kind of Laser Modulation system - Google Patents
A kind of Laser Modulation system Download PDFInfo
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- CN105591270B CN105591270B CN201410654116.7A CN201410654116A CN105591270B CN 105591270 B CN105591270 B CN 105591270B CN 201410654116 A CN201410654116 A CN 201410654116A CN 105591270 B CN105591270 B CN 105591270B
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Abstract
The invention belongs to laser modulation techniques, and in particular to a kind of laser frequency and power modulation system.Laser Modulation system of the present invention includes acousto-optic modulator, voltage-controlled attenuation module, digital phase-locked loop, time-sequence control module, RF switch, photodetector, servo circuit, spectroscope, wherein, the voltage-controlled attenuation module, RF switch, acousto-optic modulator, spectroscope, photodetector and servo circuit are sequentially arranged, form closed loop, and time-sequence control module exports be directly connected to RF switch all the way, digital phase-locked loop is connected all the way, and digital phase-locked loop connects voltage-controlled attenuation module, in addition, the acousto-optic modulator is in addition to the radiofrequency signal for receiving RF switch, also receive laser.Laser Modulation system of the present invention realizes the timing control to laser by time-sequence control module programming Control RF switch, while can realize the control to laser frequency shift frequency amount, and the luminous power of higher stability is obtained by reponse system.
Description
Technical field
The invention belongs to laser modulation techniques, and in particular to a kind of laser frequency and power modulation system.
Background technology
Since laser comes out, the application of laser has spread the every field such as work, agriculture, scientific research, national defence, laser technology at
For contemporary development speed, using wider technological means.
The cold atom research field that develops into of laser technology brings important breakthrough, laser-cooling technology to be studied as cold atom
The important means in field, semiconductor laser are the main tools of laser cooling, in cold atom gyro, atomic fountain, Bose love
The cooling of atom is realized usually using semiconductor laser or manipulate atom in the experimental systems such as Yin Sitan cohesions.Such as with
When Magneto-Optical Trap Trapping of Atoms, cooling light and anti-pumping light have different frequency detunings respectively, are agglomerated in Bose Einstein real
In experiment device, atom will pass through the processes such as Magneto-Optical Trap is cooling, polarization gradient is cooling, quadrupole magnetic well is cooling, evaporation is cooling successively, because
This needs to carry out laser break-make, shift frequency amount etc. the control in sequential.
In addition, for cold atom experimental system, the stability of laser power is one of critical index parameter.Temperature
The factors such as variation, vibration can influence the stability of laser output power, and the fluctuation of laser power can have heat effect to atom,
Additional noise is brought simultaneously, therefore has higher requirement to the stability of laser power in cold atom experimental system.
Invention content
The purpose of the present invention is：There is provided it is a kind of can improve laser power stability, and can realize the modulation of laser shift frequency
System.
Technical solution of the present invention：A kind of Laser Modulation system comprising acousto-optic modulator 2, voltage-controlled attenuation module 6, number
Phaselocked loop 7, time-sequence control module 8, RF switch 9, photodetector 4, servo circuit 5, spectroscope 3, wherein described voltage-controlled to decline
Subtract module 6, RF switch 9, acousto-optic modulator 2, spectroscope 3, photodetector 4 and servo circuit 5 to be sequentially arranged, formation is closed
Ring, and the output of 8 one tunnel of time-sequence control module is directly connected to RF switch 9, connects digital phase-locked loop 7, and digital phase-locked loop 7 all the way
Voltage-controlled attenuation module 6 is connected, in addition, the acousto-optic modulator 2 also receives laser in addition to the radiofrequency signal for receiving RF switch 9.
The power amplifier 10 amplified for radiofrequency signal is provided between the RF switch 9 and acousto-optic modulator 2.
The digital phase-locked loop includes R frequency dividers 13, Fractional-N frequency device 12, digital phase detection module 15, low-pass filter 16, pressure
Control oscillator 11, local oscillator 14, wherein the output of R frequency dividers 13 is connected to digital phase detection module 15, digital phase detection module 15
Low-pass filtered module connects voltage controlled oscillator 11, and Fractional-N frequency device 12 connects voltage controlled oscillator 11 and digital phase detection module 15, local
Oscillator 14 is connected to R frequency dividers 13, in addition, the R frequency dividers 13, Fractional-N frequency device 12 are connected with time-sequence control module 8.
The servo circuit 5 includes reference voltage module 17, photoelectricity sampling module 18, difference amplifier 19, direct current biasing
Module 20, adder 21, wherein photoelectricity sampling module 18 and reference voltage module 17 positive and negative terminal with difference amplifier 19 respectively
Connection, the output of direct current biasing module 20 and difference amplifier 19 are connected to 21 positive-negative input end of adder.
R frequency dividers 13 and Fractional-N frequency device 12 in digital phase-locked loop 7 are controlled by the TTL signal that time-sequence control module 8 is sent out,
The rf frequency of digital phase-locked loop output, to realize the shift frequency to laser.
The technique effect of the present invention：Laser Modulation system of the present invention is real by time-sequence control module programming Control RF switch
Now to the timing control of laser, while it can realize the control to laser shift frequency amount, and higher by feedback loop system acquisition
The luminous power of stability.
Description of the drawings
Fig. 1 is the functional block diagram of Laser Modulation system of the present invention；
Fig. 2 is digital phase-locked loop functional block diagram；
Fig. 3 is power control circuit block diagram；
Wherein, 1- semiconductor lasers, 2- acousto-optic modulators, 3- spectroscopes, 4- photodetectors, 5- servo circuits, 6-
Voltage-controlled attenuation module, 7- digital phase-locked loops, 8- time-sequence control modules, 9- RF switches, 10- power amplifiers, 11- voltage controlled oscillation
Device, 12-N frequency dividers, 13-R frequency dividers, 14- local oscillators, 15- digital phase discriminators, 16- low-pass filters, 17- is with reference to electricity
Die block, 18- photoelectricity sampling signals, 19- differential amplification modules, 20- direct current biasing modules, 21- adders
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and examples：
Referring to Fig. 1, Laser Modulation system of the present invention includes acousto-optic modulator 2, voltage-controlled attenuation module 6, digital phase-locked loop
7, time-sequence control module 8, RF switch 9, photodetector 4, servo circuit 5, spectroscope 3, wherein the voltage-controlled attenuation module
6, RF switch 9, acousto-optic modulator 2, spectroscope 3, photodetector 4 and servo circuit 5 are sequentially arranged, and form closed loop, and
The output of 8 one tunnel of time-sequence control module is directly connected to RF switch 9, connects digital phase-locked loop 7 all the way, and digital phase-locked loop 7 connects
Voltage-controlled attenuation module 6.
The power amplifier 10 amplified for radiofrequency signal is provided between the RF switch 9 and acousto-optic modulator 2.
In addition, the acousto-optic modulator 2 in addition to the radiofrequency signal for receiving RF switch 9, also receives laser, have in the present invention
Body case study on implementation is used as light source using semiconductor laser 1.Laser frequency is set to generate shifting after radiofrequency signal input acousto-optic modulator 2
Frequently, the frequency size of radiofrequency signal determines the shift frequency amount of acousto-optic modulator output laser, the power decision acousto-optic tune of radiofrequency signal
The diffraction efficiency of device processed that is to say the power of output laser.
The present invention mainly realizes the control of laser shift frequency amount by the acousto-optic modulator 2.Programmable digital is locked
Phase ring 7 drives as acousto-optic modulator, and the frequency that digital phase-locked loop exports radiofrequency signal is controlled by time-sequence control module 8,
The break-make of radiofrequency signal is controlled by RF switch 9, time-sequence control module 8 provides the TTL signal of RF switch 9 simultaneously, because
The programmable timing sequence control to digital phase-locked loop output frequency may be implemented by time-sequence control module for this, that is to say realization to swashing
The programmable timing sequence of light shift frequency amount controls.
The present invention to the control of laser intensity stability mainly by servo circuit 5 in conjunction with voltage-controlled attenuation module 6 come real
Existing.4 exploring laser light light intensity of photodetector obtains the information of laser fluctuation, error signal is provided by servo circuit 5, accidentally
Difference signal is given to voltage-controlled attenuation module 6, for changing the power for the radiofrequency signal for being given to acousto-optic modulator 2, RF signal power
Change so that acousto-optic modulator diffraction power change, when laser power be less than reference value when, error signal provides positive
Voltage so that voltage-controlled attenuation module output signal power increases, so that acousto-optic modulator diffraction power improves；Work as laser
When power is higher than reference value, error signal provides negative voltage so that voltage-controlled attenuation module output signal power reduces, to make
Obtaining acousto-optic modulator diffraction power reduces, by the feedback loop by laser power servo-stabilization, to realize to laser
The control of power stability.
The frequency of radiofrequency signal, phase jitter directly result in the unstable of modulator diffracted laser frequency, and the present invention uses
As radio frequency signal occurs for a kind of digital phase-locked loop, to ensure to accurately control laser shift frequency amount.
The digital phase-locked loop includes R frequency dividers 13, Fractional-N frequency device 12, digital phase detection module 15, low-pass filter 16, pressure
Control oscillator 11, local oscillator 14.Wherein, the output of R frequency dividers 13 is connected to digital phase detection module 15, digital phase detection module 15
Low-pass filtered module connects voltage controlled oscillator 11, and Fractional-N frequency device 12 connects voltage controlled oscillator 11 and digital phase detection module 15, local
Oscillator 14 is connected to R frequency dividers 13.In addition, the R frequency dividers 13, Fractional-N frequency device 12 are connected with time-sequence control module 8.Pressure
The output frequency for controlling oscillator 11 is f0, by obtaining frequency f after Fractional-N frequency device 120/ N, local oscillator 14 output signal frequency
Rate fL, it is f that frequency is obtained after R frequency dividers 13LThe signal of/R is input to digital phase discriminator together with the output of Fractional-N frequency device 12
Phase demodulation is carried out in 15, by obtaining error signal after low-pass filter 16, error signal is input to voltage-controlled the signal after phase demodulation
Oscillator 11 controls the frequency of output.
The driving of previous acousto-optic modulator mostly uses VCO to realize, and VCO output frequency precisions are relatively low, and frequency drift
Bigger, the present invention can greatly improve the precision of acousto-optic modulator output light shift frequency amount using digital phase-locked loop.While and base
This phaselocked loop is compared, and digital phase-locked loop can change the frequency of output signal by changing frequency dividing ratio N, when frequency dividing ratio passes through
The programming of sequence control module provides, and what is reached in this way has the technical effect that：It can be to realize the change of signal frequency in sequential, when that is to say
Laser shift frequency amount is controlled in sequence.
The servo circuit includes reference voltage module 17, photoelectricity sampling module 18, difference amplifier 19, direct current biasing mould
Block 20, adder 21, wherein photoelectricity sampling module 18 and reference voltage module 17 connect with the positive and negative terminal of difference amplifier 19 respectively
It connects, the output signal of direct current biasing module 20 and difference amplifier 19 is connected to 21 positive-negative input end of adder.Photoelectricity is adopted
The sampled voltage that sample signaling module 18 obtains carries out differential amplification with reference voltage module 17, obtains reflection laser power fluctuation
Error signal, error signal pass through adder 21 with direct current biasing module 20, obtain control signal, are input to voltage-controlled attenuation module
6 voltage-controlled end.Output is adjustable DC offset voltage when open loop, and output is the sum of error signal and bias voltage when closed loop.
8 one road TTL signal of the time-sequence control module is connected to the control terminal of RF switch, controls the logical of RF switch
It is disconnected, and then the break-make for being input to acousto-optic modulator radiofrequency signal is controlled, the final break-make for controlling acousto-optic modulator diffraction light is realized
Control to break-make in laser power sequential.Time-sequence control module another way TTL signal is connected to digital phase-locked loop, changes locking phase
The frequency dividing ratio of frequency divider in ring, to change the size of output radio frequency signal frequency, time-sequence control module is by programming same time control
This two-way TTL signal is made, may be implemented to the control in laser frequency shift frequency amount sequential.
The Laser Modulation system of the present invention can be very good the needs for meeting cold atom experimental system, but the present invention is not simultaneously
It is only limited to cold atom experimental system, is also not limited only to semiconductor laser.
Claims (6)
1. a kind of Laser Modulation system, which is characterized in that including acousto-optic modulator (2), voltage-controlled attenuation module (6), digital servo-control
Ring (7), time-sequence control module (8), RF switch (9), photodetector (4), servo circuit (5), spectroscope (3), wherein institute
State voltage-controlled attenuation module (6), RF switch (9), acousto-optic modulator (2), spectroscope (3), photodetector (4) and servo electricity
Road (5) is sequentially arranged, and forms closed loop, and time-sequence control module (8) exports be directly connected to RF switch (9) all the way, connects all the way
Digital phase-locked loop (7), and digital phase-locked loop (7) connects voltage-controlled attenuation module (6), in addition, the acousto-optic modulator (2) is except reception
Outside the radiofrequency signal of RF switch (9), laser is also received.
2. Laser Modulation system according to claim 1, which is characterized in that the RF switch (9) and acousto-optic modulator
(2) power amplifier (10) amplified for radiofrequency signal is provided between.
3. Laser Modulation system according to claim 1, which is characterized in that the digital phase-locked loop (7) includes R frequency dividers
(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 dividers (13) output is connected to digital phase detection module (15), digital phase detection module (15) low-pass filtered device
(16) connection voltage controlled oscillator (11), Fractional-N frequency device (12) connect voltage controlled oscillator (11) and digital phase detection module (15), locally shake
Swing device (14) and be connected to R frequency dividers (13), in addition, the R frequency dividers (13), Fractional-N frequency device (12) with time-sequence control module (8)
It is connected.
4. Laser Modulation system according to claim 1, which is characterized in that the servo circuit (5) includes reference voltage
Module (17), photoelectricity sampling module (18), difference amplifier (19), direct current biasing module (20), adder (21), wherein light
Electric sampling module (18) connect with the negative terminal of difference amplifier (19), and reference voltage module (17) and difference amplifier (19) are just
End connection, direct current biasing module (20) export the positive input terminal for being connected to adder (21), difference amplifier (19) output connection
Negative input end in adder (21).
5. Laser Modulation system according to claim 3, which is characterized in that the TTL sent out by time-sequence control module (8)
The interior R frequency dividers (13) of signal control digital phase-locked loop (7) and Fractional-N frequency device (12), the rf frequency of digital phase-locked loop output, from
And realize the shift frequency to laser.
6. Laser Modulation system according to claim 1, which is characterized in that the TTL sent out by time-sequence control module (8)
Signal controls RF switch (9), realizes the control to acousto-optic modulator (2) input radio frequency signal break-make, to realize to laser
The timing control of 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 true CN105591270B (en) | 2018-08-24 |
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| 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 |
| CN109029740B (en) * | 2018-04-20 | 2020-06-12 | 山西大学 | Device and method for measuring atomic hyperfine structure |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4665524A (en) * | 1984-05-25 | 1987-05-12 | British Telecommunications Plc | Mode locked laser light sources |
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| SI23045A (en) * | 2009-04-29 | 2010-10-29 | Instrumentation Technologies D.D. | Optical system for the transmission of a time reference signal |
| US9088369B2 (en) * | 2012-12-28 | 2015-07-21 | Synergy Microwave Corporation | Self injection locked phase locked looped optoelectronic oscillator |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4665524A (en) * | 1984-05-25 | 1987-05-12 | British Telecommunications Plc | Mode locked laser light sources |
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