CN104332816B - A kind of two beam same frequency laser that lock are to the method for any position phase - Google Patents
A kind of two beam same frequency laser that lock are to the method for any position phase Download PDFInfo
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- CN104332816B CN104332816B CN201410690155.2A CN201410690155A CN104332816B CN 104332816 B CN104332816 B CN 104332816B CN 201410690155 A CN201410690155 A CN 201410690155A CN 104332816 B CN104332816 B CN 104332816B
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Abstract
The invention provides a kind of two beam same frequency laser that lock to the method for any position phase, the method comprises the following steps：Auxiliary beam is divided into two beams by selected beam of laser as auxiliary beam using optical beam-splitter：First auxiliary beam and the second auxiliary beam；By the relative phase stabilization of the first locked light beam and the first auxiliary beam to fixed value；Stablize the relative phase of the second locked light beam and the second auxiliary beam, can be by the second locked relative phase stabilization between light beam and the second auxiliary beam to arbitrary value by changing the phase in the second demodulated signal source.Relative phase between first locked light beam and the second locked light beam mutually changes with the second locked relative position between light beam and the second auxiliary beam, so as to realize the first relative phase being locked between light beam and the second locked light beam to arbitrary phase.Party's subtraction unit is simple, easy to operate, practical, can lock two beam same frequency laser to any position phase.
Description
Technical field
The present invention relates to laser technology field, specifically a kind of two beam same frequency laser that lock are to the method for arbitrary phase.
Background technology
Compressed state optical field is a kind of very important non-classical optical state, can apply to detection, the optical precision of gravitational wave
The research fields such as measurement, the generation of entangled, quantum communication.Especially in terms of quantum communication, two single-mode squeezing state light
Or a two-mode squeezed vacuum state can be used to produce and tangle light, tangle basis and core of the light as quantum information, can be with
Complete quantum entanglement transfer, the Quantum Teleportation of ultraweak information, quantum secret communication, quantum dense coding and quantum number defect
Important principle Deng the quantum communications field is tested.
Balanced homodyne detection system is very important measurement apparatus in quantum optices experiment, can be used for measuring squeezed state
The quadrature component quantum fluctuation of light field and entangled.The system is by 50/50 optical beam-splitter, two high-quantum efficiencies
Photodetector and an electronic signal subtracter are constituted.By a beam power much larger than light field to be measured background oscillation light with it is to be measured
Light field carries out Coherent coupling on 50/50 optical beam-splitter, and two detectors separately detect the emergent light in beam splitter two-arm, visits
The result that survey device measurement is obtained is subtracted each other by subtracter, and its output signal is proportional to the quadrature component quantum fluctuation of light field to be measured,
Mutually there is close relationship the relative position of its measurement result and bias light and light field to be measured.By locking between two-beam field
With respect to position phase, you can the orthogonal amplitude of measurement signal light field or orthogonal phase noT.When bias light is differed with the position of light field to be measured
When being locked to zero, the quadrature amplitude noise of measurable signal light field；It is locked to when bias light is differed with the position of light field to be measured
During pi/2, the orthogonal position phase component noise of measurable signal light field., it is necessary to by two beam squeezed lights in the experiment for tangling light generation
PGC demodulation in pi/2 phase, light output is tangled in acquisition.The locking of above-mentioned several special relative phases is easier.
However, when Wigner functions are reconstructed, it is necessary to bias light and flashlight are locked in different relative phases, to obtain
Obtain optical field quantum fluctuation at any angle.Meanwhile, when performing quantum calculation and quantum logic behaviour, it is necessary to measure any angle
Optical field quadrature component quantum fluctuation, optimization quantum calculation and quantum logic operation result.
In the prior art, the method for locking two same frequency optical fields to any position phase is (Chinese invention patent, patent
Number：ZL)：Spatial transmission is carried out to a branch of light field first with phase modulator, two-beam is then made in an optical beam splitting
Interfere on device, finally detect interference signal using detector, the direct current signal of detector output passes through attenuator, the exchange of output
Signal is mixed with demodulated signal, and the cosine signal of attenuator output is added or subtracted each other with the sinusoidal signal that frequency mixer is exported, and obtains
Error signal sin θ ± k the cos θ, wherein θ for locking any intervention phase difference of optical field are referred to as initial bit difference,,
Proportionality coefficient k is adjusted by attenuator, intervention phase difference any angle can be locked to, error signal is fed back into piezoelectricity pottery
On porcelain, the locking of any position difference is completed.
The present invention proposes that a kind of two beam same frequency laser that lock, to the method for any position phase, are to utilize a branch of auxiliary beam,
By changing the phase of demodulated signal, the relative phase of two beam same frequency laser is locked to arbitrary value.Because two-beam is relative
The regulation of position phase realizes that the phase adjusted of demodulated signal is obtained by changing the phase of signal source by adjusting the phase of demodulated signal
, than being adjusted by attenuator, proportionality coefficient k is more accurate, directly perceived and simplicity, can arrive two beam same frequency laser accurate locks
Arbitrary phase.
The content of the invention
It is an object of the invention to provide a kind of two beam same frequency laser that lock to the method for any position phase.
The core concept of the present invention utilizes a branch of and the first locked light beam and the second locked beam frequencies off resonance
The relative phase of two beam same frequency laser is locked to arbitrary value by light beam as auxiliary beam.First, will using optical beam-splitter
Auxiliary beam is divided into two beams：First auxiliary beam and the second auxiliary beam；Then, by the first locked light beam and the first fill-in light
The relative phase stabilization of beam is to fixed value；Finally, stablize the relative phase of the second locked light beam and the second auxiliary beam, pass through
Change the phase in the second demodulated signal source, can be by the second locked relative phase stabilization between light beam and the second auxiliary beam
To arbitrary value.Relative phase between first locked light beam and the second locked light beam is auxiliary with the second locked light beam and second
The relative position helped between light beam mutually changes, so as to realize the relative phase between the first locked light beam and the second locked light beam
To arbitrary phase.
The beam same frequency laser of a kind of locking two that the present invention is provided comprises the following steps to the method for any position phase：
(1) beam of laser, is selected as auxiliary beam, and auxiliary beam is divided into two beams using optical beam-splitter：First is auxiliary
Help light beam and the second auxiliary beam.
The acquisition of auxiliary beam has two methods：A kind of is the shift frequency principle using acousto-optic modulator, by locked light beam
A part is separated, auxiliary beam is used as after acousto-optic modulator shift frequency.Another is by locking another laser and quilt
The relative phase of locked beam, auxiliary beam is used as with its output light.Auxiliary beam is divided into two beams using optical beam-splitter：
First auxiliary beam and the second auxiliary beam.First auxiliary beam is imported is locked light beam conjunction with first on the first optical mirror slip
On beam, the second subsidiary beam entrance to the second optical mirror slip beam is closed with the second locked light beam.
(2), by the relative phase stabilization of the first locked light beam and the first auxiliary beam to fixed value.
First signal source produces triangular signal, after the first electronics switch and the first high-voltage amplifier, is loaded into
On the first piezoelectric ceramics for being bonded at an optical mirror back side, the relative of the first locked light beam and the first auxiliary beam is scanned
Position phase.First auxiliary beam and the first locked light beam are closed into beam with the first optical mirror slip, the first optical mirror slip is locked to first
The transmissivity for determining light beam and the first auxiliary beam is 50%.The expression formula of first auxiliary beam light field is E0=A0cos[2π(v0+
Ω) t], the light field expression formula of the first locked light beam is E1=A1cos(2πv0t+θ1), wherein v0For the first locked light beam
Frequency, v0+ Ω is the frequency of the first auxiliary beam, θ1For the first locked relative position phase between light beam and the first auxiliary beam.
Two light beams close beam on the first optical mirror slip, close the interference signal after beam and are
The frequency of first, second and third is very high, and detector can not can only respond it and be averaged directly in response to so high frequency
Value, and last difference frequency term detector can be corresponding.By detectable signal and the first demodulated signalMixing
Afterwards, by the first low pass filter, the error signal of the first auxiliary beam of locking and the first locked light beam with respect to position phase is obtainedBy the position phase in the first demodulated signal sourceFixed value is set to, and error signal is returned to zero, this error
Signal feeds back to the first piezoelectricity pottery after the first pi controller, the first electronics switch and the first high-voltage amplifier
On porcelain, the first locked light beam is locked in fixed bit phase with the first auxiliary beam.When the first electronics switch is in scanning
During state, the signal produced by the first signal source is loaded into first by the first electronics switch and the first high-voltage amplifier
On piezoelectric ceramics, when the first electronics switch is in the lock state, the error signal of the first low pass filter output, by the
One pi controller, the first electronics switch and the first high-voltage amplifier are loaded on the first piezoelectric ceramics.
(3) relative phase of the second locked light beam and the second auxiliary beam, is stablized, by changing the second demodulated signal source
Phase, can be by the second locked relative phase stabilization between light beam and the second auxiliary beam to arbitrary value.
Secondary signal source produces triangular signal, after the second electronics switch and the second high-voltage amplifier, is loaded into
On the second piezoelectric ceramics for being bonded at an optical mirror back side, the relative of the second locked light beam and the second auxiliary beam is scanned
Position phase.Second auxiliary beam and the second locked light beam are closed into beam on the second optical mirror slip, the second optical mirror slip is to the second quilt
Locked beam and the transmissivity of the second auxiliary beam are 50%.The expression formula of second auxiliary light field is E0=A0cos[2π(v0+Ω)
T], the light field expression formula of the second locked light beam is E2=A2cos(2πv0t+θ2), wherein θ2For the second locked light beam and second
Relative position phase between auxiliary beam.The beat frequency of the locked light beam of second photodetector detection second and the second auxiliary beam is believed
Number, by this signal and the second demodulated signalAfter mixing, by the second low pass filter, locking second is obtained
The error signal of locked light beam and the second auxiliary beam with respect to position phaseSecond demodulated signal is set
The position phase in sourceAnd error signal is returned to zero, this error signal by the second pi controller, the second electronics switch and
After second high-voltage amplifier, feed back on the second piezoelectric ceramics, stablize the second locked light beam relative with the second auxiliary beam
Phase, by the phase for changing the second demodulated signal sourceSecond can be locked between light beam and the second auxiliary beam
Relative phase stabilization is to arbitrary value.
(4) relative phase, between the first locked light beam and the second locked light beam is locked with step (3) second
Relative position between light beam and the second auxiliary beam mutually changes, thus realize the first locked light beam with second be locked light beam it
Between relative phase to arbitrary phase.
The frequency of the locked light beam of described first and the second locked light beam is equal.
If the frequency of the first locked light beam and the second locked light beam is unequal, can directly with two-beam difference frequency
The equal signal source of signal demodulates the interference signal of two-beam, by the phase for adjusting demodulated signal source, it is possible to by two beams not
The relative phase stabilization of same frequency light is in arbitrary value.
The frequency of described auxiliary beam and the first locked light beam and the second locked light beam is unequal.
If auxiliary beam is equal with the frequency of locked light beam, any relative position cannot be obtained with the method for the present invention
Mutually lock.
Described auxiliary beam and the difference on the frequency of locked light beam are in the bandwidth range of detector.
The frequency (error signal for locking relative phase) of auxiliary beam and locked beam interference signal is equal to two beams
The difference of light frequency.When the frequency of interference signal is in the bandwidth range of detector, error signal can effectively be obtained by detector；
When the frequency of interference signal is not in the bandwidth range of detector, error signal can not effectively be obtained by detector, it is impossible to be obtained
The relative phase that must stablize.
The frequency of described demodulated signal is equal to the difference on the frequency of locked light beam and auxiliary beam.
When the frequency of demodulated signal is equal to the difference on the frequency of locked light beam and auxiliary beam, the error signal frequency of acquisition
Minimum, is easiest to make experimental system steady operation.
A kind of two beam same frequency laser of locking of the present invention have to the method for any position phase compared with traditional method
Have the advantage that：
(1), with adjusting sine wave compared with cosine wave signal proportionality coefficient by attenuator in the prior art, this method is only
The phase in demodulated signal source need to be adjusted, the size of phase can directly be read by signal source, with intuitively advantage.
(2), with adjusting sine wave compared with cosine wave signal proportionality coefficient by attenuator in the prior art, this method phase
The value of contraposition phase is set by the phase in Regulate signal source, and the phase of signal source output demodulated signal continuously can be adjusted accurately
Section, has the advantages that degree of regulation is high.
(3), this method utilizes a branch of auxiliary beam, by the beam same frequency laser of PGC demodulation two for adjusting demodulated signal source
To any position phase, device is simple, easy to operate.
Brief description of the drawings
Fig. 1 is locked out two beam same frequency laser to the schematic diagram of any position phase
In figure：1- first is locked light beam, and 2- second is locked light beam, 3- auxiliary beams, 4- optical beam-splitters, 5- first
Auxiliary beam, the auxiliary beams of 6- second, the optical mirror slips of 7- first, the optical mirror slips of 8- second, the piezoelectric ceramics of 9- first, 10- second
Piezoelectric ceramics, the photodetectors of 11- first, the photodetectors of 12- second, the signal sources of 13- first, the electronics of 14- first switch,
The high-voltage amplifiers of 15- first, 16- secondary signals source, the electronics of 17- second switch, the high-voltage amplifiers of 18- second, 19- first is solved
Adjust signal source, the frequency mixers of 20- first, the low pass filters of 21- first, the pi controllers of 22- first, the demodulation letters of 23- second
Number source, the frequency mixers of 24- second, the low pass filters of 25- second, the pi controllers of 26- second.
In figure, solid line is optical signal, and dotted line is electric signal.
Fig. 2 is locked out the first locked light beam and the first auxiliary beam and the second locked light beam and the second auxiliary beam phase
Monitoring signal and error signal during contraposition phase
In figure：Curve A is monitoring signal, and curve B is the locked light beam of locking first position phase relative with the first auxiliary beam
Error signal when being zero, curve C is that the locked light beam position relative with the second auxiliary beam of locking second is mutuallyWhen error
Signal, curve D is that the locked light beam position relative with the second auxiliary beam of locking second is mutuallyWhen error signal.
Fig. 3 is locked out the first locked light beam and the first auxiliary beam and the second locked light beam and the second auxiliary beam phase
Align the result after phase
In figure：Curve a is that to lock the first locked light beam position relative with the first auxiliary beam be mutually the result after zero, curve
B is that the locked light beam position relative with the second auxiliary beam of locking second is mutuallyResult afterwards, curve c is locked for locking second
Light beam position relative with the second auxiliary beam is mutuallyResult afterwards, curve d is the error signal after relative phase locking.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention makes further description.Following reality
Applying example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Embodiment 1. lock two beam same frequency laser to any position phase schematic diagram, as shown in Figure 1.Selected beam of laser is made
For auxiliary beam 3, using optical beam-splitter 4 by auxiliary beam 3 points be two beams：First auxiliary beam 5 and the second auxiliary beam 6.
First auxiliary beam 5 is imported is locked the conjunction beam of light beam 1 with first on the first optical mirror slip 7, the first photodetector 11 detects it
Beat signal；Second auxiliary beam 6 incide on the second optical mirror slip 8 with the second locked 2-in-1 beam of light beam, the second photodetection
Device 12 detects its beat signal.First optical mirror slip 7 and the locked light beam 1, second of 8 pair first of the second optical mirror slip are locked light
The transmissivity of beam 2 and auxiliary beam 3 is 50%.It is the triangular wave letter that 30Hz, amplitude are 5Vpp that first signal source 13, which produces frequency,
Number, by the first electronics switch 14 and first after high-voltage amplifier 15, it is loaded into and is bonded at the of optical mirror back side
On one piezoelectric ceramics 9, the locked light beam 1 of scanning first relative position phase with the first auxiliary beam 5；Secondary signal source 16 produce with
The identical triangular signal of first signal source 13, after the second electronics switch 17 and the second high-voltage amplifier 18, is loaded into
On the second piezoelectric ceramics 10 for being bonded at an optical mirror back side, the locked auxiliary beam 6 of light beam 2 and second of scanning second
With respect to position phase.First photodetector 11 and the direct current signal of the second photodetector 12 output are used as monitoring signal, the first quilt
The difference on the frequency that locked beam 1, second is locked light beam 2 and auxiliary beam 3 is 50MHz, and the interference signal of detection includes 50MHz
Frequency and scan frequency 30Hz, after the frequency content that 50MHz is filtered with low pass filter, in obtained monitoring signal such as Fig. 2
Shown in curve A.The frequency that AC signal and the first demodulated signal source 19 of first photodetector 11 output are produced be 50MHz,
Amplitude be mixed for 5Vpp sine wave signal in the first frequency mixer 20, after the first low pass filter 21, obtains and locks the
The error signal of the one relative phase of locked 1 and first auxiliary beam of light beam 5, the position in the first demodulated signal source 19 is mutually set to
Zero, and error signal is returned to zero, as shown in curve B in Fig. 2.The corresponding monitoring signal when error signal (curve B) is zero
(curve A) place makes marks (uppermost dotted line in Fig. 2), reduces the gain of the first high-voltage amplifier 15, switches the first electronics
Switch 14 arrives latched position, adjusts the bias voltage of the first high-voltage amplifier 15, monitoring signal is reached mark, then by the
The feedback signal of one pi controller 22 output is fed back on the first piezoelectric ceramics 9 by the first high-voltage amplifier 15, will
The first locked auxiliary beam 5 of light beam 1 and first is locked in zero phase, and curve a is the result after locking in Fig. 3.Second light
The frequency for AC signal and the second demodulated signal source 23 generation that electric explorer 12 is exported is the sine that 50MHz, amplitude are 5Vpp
Ripple signal is mixed in the second frequency mixer 24, after the second low pass filter 25, obtains the locked light beam 2 of locking second and the
The error signal of the relative phase of two auxiliary beam 6, the position in the second demodulated signal source 23 is mutually set toAnd adjust error signal
Zero, as shown in curve C in Fig. 2.When error signal (curve C) is zero, corresponding monitoring signal (curve A) place makes marks, drop
The gain of low second high-voltage amplifier 18, the second electronics of switching switch 17 arrives latched position, adjusts the second high-voltage amplifier 18
Bias voltage, monitoring signal is reached mark, the feedback signal for then exporting the second pi controller 26 is passed through
Second high-voltage amplifier 18 is fed back on the second piezoelectric ceramics 10, and the second locked light beam 2 is locked in the second auxiliary beam 6In phase, curve b is the result after locking in Fig. 3.The position in the second demodulated signal source 23 is mutually set toAnd believe error
Number zeroing, it is identical with aforesaid operations as shown in curve D in Fig. 2, make monitoring signal reach mark, then by the second ratio accumulate
The feedback signal that sub-controller 26 is exported is fed back on the second piezoelectric ceramics 10 by the second high-voltage amplifier 18, and second is locked
Determine light beam 2 to be locked in the second auxiliary beam 6In phase, curve c is the result after locking in Fig. 3, and curve d is phase in Fig. 3
To the error signal after phase locking.By changing the phase in the second demodulated signal source 23, can by the second locked light beam 2 with
Relative phase stabilization between second auxiliary beam 6 is to arbitrary value.First locked light beam 1 and second is locked between light beam 2
Relative phase mutually change with the second locked relative position between light beam 2 and the second auxiliary beam 6, so as to realize that first is locked
Relative phase that light beam 1 and second is locked between light beam 2 is determined to arbitrary phase.
Above-described embodiment has been merely given as the locked light beam 1 of locking first and mutually arrived with respect to position with the second locked light beam 2
WithSituation, all possibility are not described.In fact, can also be by adjusting the phase in demodulated signal source, locking the
One locked light beam 1 mutually arrives other arbitrary values with the second locked light beam 2 with respect to position, is the scope that the present invention is covered.
Described above is only the preferred embodiment of the present invention, it is noted that come for those skilled in the art
Say, without departing from the technical principles of the invention, some improvement and replacement can also be made, these, which improve and replaced, also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of two beam same frequency laser that lock are to the method for any position phase, it is characterised in that comprise the following steps：
1) beam of laser, is selected as auxiliary beam (3), and auxiliary beam (3) is divided into two beams using optical beam-splitter (4)：The
One auxiliary beam (5) and the second auxiliary beam (6)；
2), by setting the phase in the first demodulated signal source (19), by the first locked light beam (1) and the first auxiliary beam (5)
Relative phase stabilization to fixed value；
3) relative phase of the second locked light beam (2) and the second auxiliary beam (6), is stablized, by changing the second demodulated signal
The phase in source (23), can be by the second locked relative phase stabilization between light beam (2) and the second auxiliary beam (6) to arbitrarily
Value；
4), the relative phase between the first locked light beam (1) and the second locked light beam (2) is with step 3) in it is second locked
Relative position between light beam (2) and the second auxiliary beam (6) mutually changes, so as to realize the first locked light beam (1) and the second quilt
Relative phase between locked beam (2) is to arbitrary phase；
The frequency of described auxiliary beam (3) and the first locked light beam (1) and the second locked light beam (2) is unequal.
2. a kind of two beam same frequency laser that lock as claimed in claim 1 are to the method for any position phase, it is characterised in that described
Auxiliary beam (3) light beam (1) can be locked by acousto-optic modulator shift frequency first or the second locked light beam (2) is obtained,
Or served as with the output light of an other laser.
3. a kind of two beam same frequency laser that lock as claimed in claim 1 are to the method for any position phase, it is characterised in that described
Auxiliary beam (3) and the first locked light beam (1) and second be locked the difference on the frequency of light beam (2) in the first detector (11) and
In the bandwidth range of second detector (12).
4. a kind of two beam same frequency laser that lock as claimed in claim 1 are to the method for any position phase, it is characterised in that described
The first demodulated signal source (19) and the output frequency in the second demodulated signal source (23) be equal to the first locked light beam (1) and second
The difference on the frequency of locked light beam (2) and auxiliary beam (3).
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| Application Number | Priority Date | Filing Date | Title |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410690155.2A CN104332816B (en) | 2014-11-26 | 2014-11-26 | A kind of two beam same frequency laser that lock are to the method for any position phase |
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| CN104332816B true CN104332816B (en) | 2017-10-17 |
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| CN110779623A (en) * | 2019-11-07 | 2020-02-11 | 山西大学 | Balanced zero-beat detector integrated with locking branch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367529A (en) * | 1993-06-15 | 1994-11-22 | Spectra-Physics Lasers, Inc. | Apparatus and method for improved time synchronization of pulsed laser systems |
| US6141138A (en) * | 1997-09-26 | 2000-10-31 | Japan Science And Technology Corporation | Apparatus and method for measuring characteristics of light |
| CN102706463A (en) * | 2012-06-18 | 2012-10-03 | 山西大学 | Method for locking interference phase difference of optical field and device |
-
2014
- 2014-11-26 CN CN201410690155.2A patent/CN104332816B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367529A (en) * | 1993-06-15 | 1994-11-22 | Spectra-Physics Lasers, Inc. | Apparatus and method for improved time synchronization of pulsed laser systems |
| US6141138A (en) * | 1997-09-26 | 2000-10-31 | Japan Science And Technology Corporation | Apparatus and method for measuring characteristics of light |
| CN102706463A (en) * | 2012-06-18 | 2012-10-03 | 山西大学 | Method for locking interference phase difference of optical field and device |
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