CN107561819B - A kind of squeezed vacuum state light field generating means and method - Google Patents
A kind of squeezed vacuum state light field generating means and method Download PDFInfo
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- CN107561819B CN107561819B CN201710787482.3A CN201710787482A CN107561819B CN 107561819 B CN107561819 B CN 107561819B CN 201710787482 A CN201710787482 A CN 201710787482A CN 107561819 B CN107561819 B CN 107561819B
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Abstract
The invention discloses a kind of squeezed vacuum state light field generating means and method, described device includes: laser, optical parametric oscillator, frequency shifting arrangement, temperature regulating device, lock chamber device, half-wave plate, the first polarized light beam splitting mirror, the second polarized light beam splitting mirror, dichroic mirror；The quick frequency displacement to continuous single-frequency laser may be implemented by frequency shifting arrangement, obtain fill-in light, and the direction of propagation of laser will not be changed；Fill-in light obtains carrying after optical parametric oscillator the fill-in light of chamber information, lock chamber signal can be generated according to the fill-in light for carrying chamber information by locking chamber device, the long locking of chamber is carried out to optical parametric oscillator, the accurate temperature controlling to crystal may be implemented in temperature regulating device, makes optical parametric oscillator work in degeneracy state.Using the device of the invention or method, the mechanical stability of optical parametric oscillator can be maintained, to obtain the squeezed vacuum state light field for stablizing output to avoid seed injection light or the problem of three Resonant parametric oscillators must be used.
Description
Technical field
The present invention relates to optical fields, more particularly to a kind of squeezed vacuum state light field generating means and method.
Background technique
It is prepared using the following optical parametric oscillator of threshold value (Optical Parametric Oscillator, abbreviation OPO)
Continuous variable quantum vacuum pressure source is the effective method of comparative maturity.The matched degeneracy OPO of I saphe is generallyd use to obtain very
Empty pressure source.When degeneracy OPO runs on threshold value or less, the signal light of generation and idle light mean field are zero, i.e. degeneracy OPO is at this time
Output is vacuum compression source.
In the case where the chamber of OPO chamber is long uncontrolled, extraneous mechanical disturbance influences whether the generation in vacuum compression source
With use.The common line-locked technology of chamber progress to OPO chamber needs faint identical as vacuum compression source frequency by one
It polarizes in consistent seed light injection OPO chamber to extract lock chamber signal, but the device in this way is transformed into as optical parameter
Amplifier cannot obtain proper vacuum compression source.Even if very faint seed light is injected, in low frequency ranges
Classical noise inside can be also introduced, the quality at the low frequency of vacuum compression source is influenced.
Another kind lock chamber technology is that OPO is made to run on three resonance states, extracts pump light transmission signal and carries out lock chamber.So
And the pump light of three resonance OPO can be in intracavitary resonance, it at this time can more to requirements such as the parameters such as temperature, crystal length of OPO chamber
It is harsh, it is not easy to realize steady running.
Summary of the invention
The object of the present invention is to provide a kind of squeezed vacuum state light field generating means and methods, to lock optical parameter vibration
The chamber for swinging device is long, obtains the squeezed vacuum state light field for stablizing output.
To achieve the above object, the present invention provides following schemes:
A kind of squeezed vacuum state light field generating means, described device include: laser, optical parametric oscillator, frequency displacement dress
It sets, temperature regulating device, lock chamber device, half-wave plate, the first polarized light beam splitting mirror, the second polarized light beam splitting mirror, dichroic mirror；
The laser is for generating continuous single-frequency laser；
The first polarized light beam splitting mirror, is arranged on the first emitting light path of the laser, and being used for will be described continuous
Single-frequency laser reflexes to the optical parametric oscillator, obtains simulated light；
The frequency shifting arrangement is arranged on the second emitting light path of the laser, is used for according to the simulated light to institute
It states continuous single-frequency laser and carries out frequency displacement, obtain fill-in light；
The half-wave plate is arranged on the emitting light path of the frequency shifting arrangement, for controlling the polarization side of the fill-in light
To for horizontal polarization；
The fill-in light is transmitted through the optical parametric oscillator by the first polarized light beam splitting mirror；
The optical parametric oscillator is arranged on the emitting light path of the first polarized light beam splitting mirror, for described
Fill-in light is transmitted, and the first transmitted light is obtained；
The dichroic mirror is arranged on the emitting light path of the optical parametric oscillator, for first transmitted light
It is reflected, obtains the first reflected light；
The continuous single-frequency laser that the laser is launched is transmitted through the optical parameter by the dichroic mirror and shakes
Device is swung, as pump light, squeezed vacuum state light field is generated according to optical parametric oscillator described in the pumping optical pumping；
The second polarized light beam splitting mirror is arranged on the dichroic mirror emitting light path, for first reflected light
It is transmitted, obtains the second transmitted light；
The lock chamber device, is arranged on the emitting light path of the second polarized light beam splitting mirror, for receiving described second
Transmitted light；The lock chamber device, connect with the optical parametric oscillator, is used for according to second transmitted light to the optics
Parametric oscillator carries out the long locking of chamber；
The temperature regulating device is connect with the optical parametric oscillator, for controlling in the optical parametric oscillator
Crystal temperature effect.
The optional frequency shifting arrangement includes signal generator, power amplifier, electro-optic phase modulator；The signal hair
Raw device, for generating sine wave signal；The power amplifier is connect with the signal generator, for the sine wave
Signal amplifies, and obtains amplified signal；The electro-optic phase modulator is connect, for receiving with the power amplifier
Amplified signal is stated, and frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, is obtained described
Fill-in light.
Optionally, the optical parametric oscillator includes plano-concave mirror, nonlinear crystal；
The plano-concave mirror, is arranged on the transmitted light path of the dichroic mirror, described non-for the pump light to be transmitted through
The inside of linear crystal；
The nonlinear crystal is arranged on the transmitted light path of the plano-concave mirror, for generating institute according to the pump light
State squeezed vacuum state light field；
The fill-in light is transmitted through the plano-concave mirror by the nonlinear crystal, and the plano-concave mirror is saturating by the fill-in light
It is incident upon the dichroic mirror, obtains the first transmitted light.
Optionally, the lock chamber device includes photodetector, lock-in amplifier, proportional plus integral plus derivative controller and high pressure
Amplifier；
The photodetector is arranged on the emitting light path of the second polarized light beam splitting mirror, is used for described second
Transmitted light is converted to electric signal；
The signal input part of the lock-in amplifier is connect with the signal output end of the photodetector, for according to institute
It states electric signal and obtains error signal；
The error-signal output of the signal input part of the proportional plus integral plus derivative controller and the lock-in amplifier connects
It connects, for the error signal to be adjusted, obtains regulating error signal；
The signal input part of the high-voltage amplifier respectively with the modulated signal output end of the lock-in amplifier and institute
State the signal output end connection of proportional plus integral plus derivative controller；The high-voltage amplifier is used for the modulation of the lock-in amplifier
Signal and the regulating error signal carry out Hybrid amplifier, obtain lock chamber signal；
Piezoelectric ceramics, the signal output end of the high-voltage amplifier and the piezoelectric ceramics are provided on the plano-concave mirror
The connection of signal control terminal.
Optionally, the temperature regulating device includes temperature controller, Peltier element, thermistor and holding furnace；
The outside of the nonlinear crystal is arranged in the holding furnace, for keeping the temperature to the nonlinear crystal；
The thermistor is arranged in the holding furnace, for measuring the actual temperature of nonlinear crystal；And it will be described
Actual temperature is sent to the temperature controller；
The temperature controller, for setting the operating temperature of the nonlinear crystal；And calculate the actual temperature with it is described
The difference of operating temperature, obtains temperature gap；The temperature controller controls the Peltier element according to the temperature gap；
The Peltier element is arranged in the holding furnace, connect with the temperature controller, described non-linear for adjusting
The temperature of crystal.
The present invention also provides a kind of squeezed vacuum state light field generation method, the method is applied to a kind of above-mentioned vacuum pressure
Contracting state light field generating means,
The described method includes:
Obtain continuous single-frequency laser；
The continuous single-frequency laser is reflected, simulated light is obtained；
Frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, obtains fill-in light；
The fill-in light is converted into electric signal；
The electric signal is mixed, demodulation filtering with the modulated signal of the lock-in amplifier, obtains error letter
Number；
Proportional integration, differential control are carried out to the error signal, obtain regulating error signal；
Hybrid amplifier is carried out to the modulated signal and the regulating error signal, obtains lock chamber signal；
The long locking of chamber is carried out according to the lock chamber signal；
Generate stable squeezed vacuum state light field.
Optionally, described to generate stable squeezed vacuum state light field, it specifically includes
Obtain pump light；
The pump light generates signal light field and idle light field by optical parametric oscillator process；
The reaction temperature for controlling the signal light field and the idle light field is degeneracy point, while by the function of the pump light
Rate control is in threshold value hereinafter, generating stable squeezed vacuum state light field.
Optionally, described that frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, fill-in light is obtained, it is specific to wrap
It includes:
Obtain sine wave signal；
The sine wave signal is amplified, amplified signal is obtained；
Frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, obtains fill-in light.
Optionally, the signal light field and the reaction temperature of the idle light field of controlling is degeneracy point, is specifically included:
Set the operating temperature of the signal light field and the idle light field；
Obtain the actual temperature of the signal light field and the idle light field；
The difference for calculating the operating temperature Yu the actual temperature, obtains temperature gap；
The reaction temperature that the signal light field and the idle light field are controlled according to the temperature gap is degeneracy point.
Compared with prior art, the present invention has following technical effect that the present invention provides a kind of squeezed vacuum state light fields
Generating means and method may be implemented the quick frequency displacement to continuous single-frequency laser by frequency shifting arrangement, obtain fill-in light, and will not
Change the direction of propagation of laser；Fill-in light obtains carrying after optical parametric oscillator the fill-in light of chamber information, locks chamber device
Lock chamber signal can be generated according to the fill-in light for carrying chamber information, the long locking of chamber, temperature regulating device are carried out to optical parametric oscillator
The accurate temperature controlling to crystal may be implemented, make optical parametric oscillator work in degeneracy state.The present apparatus and method avoid note
The problem of entering seed light or must be using three Resonant parametric oscillators, maintains the mechanically stable of optical parametric oscillator
Property, so as to obtain the squeezed vacuum state light field for stablizing output.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of squeezed vacuum state light field generating means provided in an embodiment of the present invention；
Fig. 2 is simulated light provided in an embodiment of the present invention and and resonance mode of the fill-in light in optical parametric oscillator chamber
Figure；
Fig. 3 is simulated light provided in an embodiment of the present invention and the fill-in light after frequency displacement being total in optical parameter vibration device chamber
Shake ideograph；
Fig. 4 is the structural schematic diagram of the measuring device measured to the squeezed vacuum state light field of generation；
Fig. 5 is the noise bounce frequency spectrum for the squeezed vacuum state light field that measuring device detects optical parametric oscillator output
Figure；
Fig. 6 is the flow chart that a kind of squeezed vacuum state light field provided in an embodiment of the present invention generates.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of squeezed vacuum state light field generating means and methods, to lock optical parameter vibration
The chamber for swinging device is long, obtains the squeezed vacuum state light field for stablizing output.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is a kind of structural schematic diagram of squeezed vacuum state light field generating means provided in an embodiment of the present invention.
A kind of squeezed vacuum state light field generating means as shown in Figure 1, comprising: laser, optical parametric oscillator 1, frequency
Moving device 2, temperature regulating device 3, lock chamber device 4, half-wave plate 6, the first polarized light beam splitting mirror 7, dichroic mirror 8, the second polarized light beam splitting
Mirror 9；
The optical parametric oscillator 1 includes nonlinear crystal 101, plano-concave mirror 102 and piezoelectric ceramics 103；
The frequency shifting arrangement 2 includes signal generator 201, power amplifier 202, electro-optic phase modulator 203；
The temperature regulating device 3 includes temperature controller 301, thermistor 302, Peltier element 303 and holding furnace 304；
The lock chamber device 4 includes lock-in amplifier 401, proportional plus integral plus derivative controller 402,403 and of high-voltage amplifier
Photodetector 404.
The half-wave plate 6 is arranged on the emitting light path of the frequency shifting arrangement 2；The first polarized light beam splitting mirror 7, if
It sets on the first emitting light path of the laser；The emergent light of the optical parametric oscillator 1 is arranged in the dichroic mirror 8
On the road；The second polarized light beam splitting mirror 9 is arranged on 8 emitting light path of dichroic mirror.
Squeezed vacuum state light field generating means provided by the above embodiment, may be implemented by frequency shifting arrangement 2 to continuous list
The quick frequency displacement of frequency laser obtains fill-in light, and will not change the direction of propagation of laser；Fill-in light passes through optical parametric oscillator
Obtain carrying the fill-in light of chamber information after 1, lock chamber device 4 can generate lock chamber signal according to the fill-in light for carrying chamber information, right
Optical parametric oscillator carries out the long locking of chamber, and temperature regulating device 3 may be implemented to make optical parametric oscillator to the accurate temperature controlling of crystal
1 work is in degeneracy state.It must be resonated present arrangement avoids seed injection light or using three Resonant parametric oscillators 1 three
It leads to the problem of, maintains the mechanical stability of optical parametric oscillator 1, so as to obtain the squeezed vacuum state for stablizing output
Light field.
The laser is for generating continuous single-frequency laser；The present invention uses a low noise single-frequency continuous wave 532nm/
For 1064nm dual laser as laser source, a part for the laser that medium wavelength is 1064nm is the auxiliary of horizontal polarization direction
Light is helped, a part is the simulated light of vertical polarization, and wavelength is pumping of the laser of 532nm as optical parametric oscillator
Light.
The first polarized light beam splitting mirror 7, is arranged on the first emitting light path of the laser, and being used for will be described continuous
Single-frequency laser reflexes to the optical parametric oscillator 1, obtains simulated light.Since the average light field of compression vacuum is zero, so
Identical simulation optical analog squeezed vacuum state light field is polarized with compression vacuum frequency using a branch of.
Fig. 2 is simulated light provided in an embodiment of the present invention and and resonance mode of the fill-in light in optical parametric oscillator
Figure；Fig. 3 is resonance of the fill-in light in optical parametric oscillator chamber after simulated light provided in an embodiment of the present invention and frequency displacement
Ideograph.
The frequency shifting arrangement 2, is arranged on the second emitting light path of the laser, is used for according to the simulated light to institute
It states continuous single-frequency laser and carries out frequency displacement, obtain fill-in light.The fill-in light is transmitted through institute by the first polarized light beam splitting mirror 7
State optical parametric oscillator 1.
Specifically, as shown in Fig. 2, (b) and (c) is that the fill-in light of the horizontal direction polarization of frequency displacement and vertical does not occur respectively
The simulated light of polarization direction passes through the Resonance Transmission direct current signal of optical parametric oscillator 1, although fill-in light and simulated light frequency
It is identical, but polarization cannot vertically resonate simultaneously in the intracavitary of optical parametric oscillator 1, it is therefore desirable to frequency is carried out to fill-in light
It moves.Signal generator 201 generates the sine wave of 650MHz, and the electricity of fiber coupling is loaded into after amplifying by power amplifier 202
The signal input part of optical phase modulator 203, fill-in light power after electro-optic phase modulator 203, which is transformed into, to be symmetrically distributed in
On the sideband of laser frequency two sides, realize frequency displacement, single order sideband signals can with simulated light optical parametric oscillator 1 chamber
It is interior to resonate simultaneously.As shown in figure 3, (b) be fill-in light transmission signal, (c) be simulated light transmission signal, (d) be fill-in light
The single order sideband signals that frequency displacement generates, (e) the single order sideband signals of the other side generated for auxiliary optical frequency shift.At this point, extract with
The single order sideband signals (d) that simulated light transmission signal is overlapped carry out the long locking of chamber of optical parametric oscillator 1.Due to simulated light with
The squeezed vacuum state light field to be generated, with polarization, is used only to the accurate frequency displacement for assisting frequency shifting arrangement 2 to realize to fill-in light with frequency,
Therefore during generating squeezed vacuum state light field, simulated light is kept off placement, avoids its squeezed vacuum state light to generation
Field impacts.The frequency shifting arrangement 2 provides the radiofrequency signal of a sine wave, allows the frequency shift amount of sideband quick
Change, and the direction of propagation of optical path will not be changed.
The half-wave plate 6 is arranged on the emitting light path of the frequency shifting arrangement 2, for controlling the polarization of the fill-in light
Direction is horizontal polarization.
The optical parametric oscillator 1 is arranged on the emitting light path of the first polarized light beam splitting mirror 7, for institute
It states fill-in light to be transmitted, obtains the first transmitted light.
Specifically, the optical parametric oscillator 1 of the semi monolithic structure includes the peaceful concave mirror 202 of nonlinear crystal 101.Institute
Nonlinear crystal 101 is stated using I type-Ⅱphase matching nonlinear crystal, preferably I type-Ⅱphase matching nonlinear crystal phosphoric acid
Oxygen titanium potassium (PPKTP) crystal.One end of the nonlinear crystal 101 is convex surface, and the other end is plane, the curvature half on the convex surface
Diameter is 12mm, and is coated with that (reflectivity is the@of R < 0.1% 1064nm, R < 0.2%@to the anti-reflection film of 1064nm and 532nm light
532nm), the concave curvature radius of the plano-concave mirror 102 is 25mm, and is coated with the part reflectance coating to 1064nm and 532nm light
(transmissivity to orthogonal polarized light is the Ts=13%@@of 1064nm, Ts > 20% 532nm).The Optical Parametric of the semi monolithic structure
Amount 1 device of oscillator is simple, interior cavity loss is low, stability is high.
The fill-in light is transmitted from the optical parametric oscillator 1, obtains the first transmitted light for carrying chamber information,
The dichroic mirror 8 is arranged on the emitting light path of the optical parametric oscillator 1, anti-for carrying out to first transmitted light
It penetrates, obtains the first reflected light；The second polarized light beam splitting mirror 9 is arranged on 8 emitting light path of dichroic mirror, for described
First reflected light is transmitted, and the second transmitted light is obtained；The second polarized light beam splitting mirror 9 is arranged in the lock chamber device 4
On emitting light path, for receiving second transmitted light；The lock chamber device 4, connect with the optical parametric oscillator 1, uses
In being carried out according to second transmitted light to the optical parametric oscillator 1, chamber is long to be locked.
Specifically, the lock chamber device 4 includes lock-in amplifier 401, proportional plus integral plus derivative controller 402, high voltage amplifier
Device 403 and photodetector 404；
The photodetector 404 is arranged on the emitting light path of the second polarized light beam splitting mirror 9, and being used for will be described
Second transmitted light is converted to electric signal；
The signal input part of the lock-in amplifier 401 is connect with the signal output end of the photodetector 404, described
Electric signal is realized in frequency mixer with local modulated signal in 401 inside of lock-in amplifier and is demodulated with frequency, after it will demodulate
Signal is sent into low-pass filter and obtains error signal.
The signal input part of the proportional plus integral plus derivative controller 402 and the error signal of the lock-in amplifier 401 are defeated
Outlet connection obtains regulating error signal for carrying out PID control parameter to the error.
403 signal input part of high-voltage amplifier respectively with the modulated signal output end of the lock-in amplifier and institute
State the signal output end connection of proportional plus integral plus derivative controller；For by the modulated signal of the lock-in amplifier and the error
Adjustment signal carries out Hybrid amplifier, obtains lock chamber signal.
Be provided with piezoelectric ceramics 103 on the plano-concave mirror 102, the signal output end of the high-voltage amplifier 403 with it is described
The signal control terminal of piezoelectric ceramics 103 connects.In the lock chamber signal loading to piezoelectric ceramics 103, for changing piezoelectric ceramics
103 flexible form, to realize to the long locking of the chamber of optical parametric oscillator 1.The chamber of the optical parametric oscillator 1 is long
It is locked on the resonant frequency of the fill-in light, so that long stablize of chamber is in not detuning state, to export stable vacuum pressure
Contracting state light field.
The continuous single-frequency laser that the laser is launched is transmitted through optical parametric oscillator 1 by dichroic mirror 8, as pump
Pu light generates squeezed vacuum state light field according to optical parametric oscillator 1 described in the pumping optical pumping.
Specifically, pump light is incident in optical parametric oscillator 1, into after I type-Ⅱphase matching nonlinear crystal 101,
By temperature regulating device 3, accurately control crystal temperature effect reaches operating temperature, i.e., when crystal temperature effect is degeneracy point, optical parametric oscillator
1 inside-pumping light can generate frequencies into degeneration and polarize identical signal light field and idle light field.At this point, the pumping light power is controlled
When below the threshold value of the optical parametric oscillator 1, the optical parametric oscillator 1 exports stable squeezed vacuum state light
?.
The temperature regulating device 3 includes temperature controller 301, thermistor 302, Peltier element 303 and holding furnace 304.Tool
Body, 304 inner layer of holding furnace is red copper, and outer layer is polysulfone material, and the I type-Ⅱphase matching nonlinear crystal 101 is placed on guarantor
In warm furnace 304.The thermistor 302 and Peltier element 303 are both placed in holding furnace 304.Thermistor 302 is used for
The actual temperature of nonlinear crystal 101 is measured, and the actual temperature measured is sent to temperature controller 301.Temperature controller 301 is used for
The operating temperature for setting nonlinear crystal 101, calculates the difference of the operating temperature and actual temperature, obtains temperature gap, and
According to the temperature gap by current feedback to Peltier element 303, by control Peltier element 303 to nonlinear crystal
101 carry out temperature control, and temperature gap is decreased to zero, realizes the accurate temperature controlling to nonlinear crystal 101.It preferably, will be non-linear
The temperature of crystal 101 is controlled at 45 DEG C, is at this time optimum phase matching temperature, and optical parametric oscillator 1 works in degeneracy state,
When by pumping light power control below the threshold value of the optical parametric oscillator 1, the optical parametric oscillator 1 is exported
Stable squeezed vacuum state light field.
Fig. 4 is the structural schematic diagram of the measuring device measured to the squeezed vacuum state light field of generation；Fig. 5 is measurement dress
Set the noise bounce frequency spectrum for detecting the squeezed vacuum state light field of optical parametric oscillator output.
The vacuum pressure generated after locking such as Fig. 4, the chamber length that the present invention measures optical parametric oscillator by measuring device
Contracting state light field.
Quantum vacuum compressed state optical field measuring device measures squeezed vacuum state light field using the method for balanced homodyne detection
Noise bounce.The measuring device 5 is anti-including 507, the 2nd 45 ° of signal generator 509, high-voltage amplifier 508, piezoelectric ceramics height
Mirror 506,50/50 beam splitter 501, the second photodetector 502, third photodetector 503, subtracter 504 and frequency spectrum point
Analyzer 505.High-voltage amplifier 508 is arranged on the emitting light path of signal generator 509, and the 2nd 45 ° of high reflective mirror 506 is arranged in height
On the emitting light path for pressing amplifier 508, the piezoelectric ceramics 507 is arranged on the 2nd 45 ° of high reflective mirror 506,50/50 beam splitting
Mirror 501 is arranged on the emitting light path of the 2nd 45 ° of high reflective mirror 506, the second photodetector 502 and third photodetector
503 are separately positioned in the transmission and reflected light path of 50/50 beam splitter 501, the second photodetector 502 and third light
The signal output end of electric explorer 503 is separately connected the subtracter 504, and the signal output end of the subtracter 504 connects frequency
Spectrum analysis instrument 505.
Specifically, laser a part that the wavelength that laser generates is 1064nm is incident to second as local oscillations light
45 ° of high reflective mirrors 506；The triangular signal that signal generator 509 generates is loaded into piezoelectric ceramics after high-voltage amplifier amplifies
On 507, the phase of local oscillations light is adjusted for scanning piezoelectric ceramics 507, the local oscillations light after phase adjusted is through second
45 ° of high reflective mirrors 506 reflex to 50/50 beam splitter 501.
Optical parametric oscillator 1 after the long locking of the chamber exports stable squeezed vacuum state light field, the vacuum compression
State light field is reflected on beam splitter 501 by the one 45 ° of high reflective mirror 10, the local vibration after squeezed vacuum state light field and phase adjusted
Light is swung after the interference of 50/50 beam splitter, it is semi-transparent semi-reflecting to the second photodetector 502 and third photodetector 503, institute respectively
It states the AC signal that the second photodetector 502 and third photodetector 503 export and is input to the frequency spectrum after subtracter
Analyzer 505, the spectrum analyzer 505 are used to analyze the fluctuating frequency spectrum of record squeezed vacuum state light field.Squeezed vacuum state light
As shown in figure 5, curve (a) is shot noise limit, curve (b) scanning local oscillations light phase is measured for the noise bounce of field
Noise result, its compression of the squeezed vacuum state light field of stable output are lower than shot noise 7.2dB.
The present invention also provides a kind of squeezed vacuum state light field generation method, the method is applied to above-mentioned squeezed vacuum state
Light field generating means.
Fig. 6 is the flow chart of squeezed vacuum state light field generation method provided in an embodiment of the present invention.As shown in fig. 6, described
Method includes:
Step S601: continuous single-frequency laser is obtained.
Specifically, being generated using a low noise single-frequency continuous wave 532nm/1064nm dual laser as laser source
Continuous single-frequency laser.
Step S602: the continuous single-frequency laser is reflected, simulated light is obtained.
Specifically, the first polarized light beam splitting mirror 7 is arranged on the first emitting light path of the laser, it is used for institute
It states continuous single-frequency laser and reflexes to the optical parametric oscillator 1, obtain simulated light.Since the average light field of compression vacuum is
Zero, so polarizing identical simulation optical analog squeezed vacuum state light field with compression vacuum frequency using a branch of.
Step S603: frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, obtains fill-in light.
It specifically includes:
Obtain sine wave signal；
The sine wave signal is amplified, amplified signal is obtained；
Frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, obtains fill-in light.
Specifically, generating the sine wave of 650MHz by signal generator 201, sine wave is put by power amplifier 202
The signal input part of the electric light debugger 203 of fiber coupling is loaded into after big, fill-in light power after electrooptic modulator 203 turns
It changes on the sideband for being symmetrically distributed in laser frequency two sides, realizes frequency displacement, single order sideband signals can be with simulated light in optics
The intracavitary of parametric oscillator 1 is resonated simultaneously.
Step S604: the fill-in light is converted into electric signal.
Specifically, the fill-in light is transmitted through the optical parametric oscillator 1 by the first polarized light beam splitting mirror 7,
The fill-in light is transmitted from the optical parametric oscillator 1, obtains the first transmitted light for carrying chamber information, described double-colored
Mirror 8 is arranged on the emitting light path of the optical parametric oscillator 1, for reflecting first transmitted light, obtains
One reflected light；The second polarized light beam splitting mirror 9 is arranged on 8 emitting light path of dichroic mirror, for first reflection
Light is transmitted, and the second transmitted light is obtained；The outgoing of the second polarized light beam splitting mirror 9 is arranged in the photodetector 404
In optical path, for second transmitted light to be converted to electric signal.
Step S605: the electric signal is mixed, demodulation filtering with the modulated signal of the lock-in amplifier, is obtained
To error signal.
Specifically, the signal output end of the signal input part of the lock-in amplifier 401 and the photodetector 404 connects
It connects, the electric signal is realized in frequency mixer with local modulated signal in 401 inside of lock-in amplifier and demodulated with frequency, by that will solve
Signal after tune is sent into low-pass filter and obtains error signal.
Step S606: proportional integration is carried out to the error signal, differential controls, acquisition regulating error signal.
Specifically, the error of the signal input part of the proportional plus integral plus derivative controller 402 and the lock-in amplifier 401
Signal output end connection obtains regulating error signal for carrying out PID control parameter to the error.
Step S607: carrying out Hybrid amplifier to the modulated signal and the regulating error signal, obtains lock chamber signal.
Specifically, 403 signal input part of high-voltage amplifier is exported with the modulated signal of the lock-in amplifier respectively
The connection of the signal output end of end and the proportional plus integral plus derivative controller；For by the modulated signal of the lock-in amplifier and
The regulating error signal carries out Hybrid amplifier, obtains lock chamber signal.
Step S608: the long locking of chamber is carried out according to the lock chamber signal.
Specifically, piezoelectric ceramics 103 is provided on the plano-concave mirror 102, the signal output end of the high-voltage amplifier 403
It is connect with the signal control terminal of the piezoelectric ceramics 103.In the lock chamber signal loading to piezoelectric ceramics 103, for changing pressure
The flexible form of electroceramics 103, to realize to the long locking of the chamber of optical parametric oscillator 1.By the optical parametric oscillator 1
Chamber length be locked on the resonant frequency of the fill-in light it is stable to export so that chamber is long to stablize the not detuning state that is in
Squeezed vacuum state light field.
Step S609: stable squeezed vacuum state light field is generated.
It specifically includes:
Step S6091: pump light is obtained.
Specifically, the continuous single-frequency laser that the laser is launched is transmitted through optical parametric oscillator by dichroic mirror 8
1, as pump light, squeezed vacuum state light field is generated according to optical parametric oscillator 1 described in the pumping optical pumping
Step S6092: the pump light generates signal light field and idle light field by optical parametric oscillator process.
Specifically, pump light is incident in optical parametric oscillator 1, into after I type-Ⅱphase matching nonlinear crystal 101,
By temperature regulating device 3, accurately control crystal temperature effect reaches operating temperature, i.e., when crystal temperature effect is degeneracy point, optical parametric oscillator
1 inside-pumping light can generate frequencies into degeneration and polarize identical signal light field and idle light field.
Step S6093: the reaction temperature for controlling the signal light field and the idle light field is degeneracy point, while will be described
The power control of pump light is in threshold value hereinafter, obtaining squeezed vacuum state light field.
It specifically includes:
Set the operating temperature of the signal light field and the idle light field；By 301 setting signal light field of temperature controller and
The operating temperature of the idle light field.
Obtain the actual temperature of the signal light field and the idle light field；Non-linear crystalline substance is measured by thermistor 302
The actual temperature of body 101, to obtain the actual temperature of signal light field and the idle light field.
The difference for calculating the operating temperature Yu the actual temperature, obtains temperature gap；Temperature controller 301 calculates the work
The difference for making temperature and actual temperature, obtains temperature gap.
The reaction temperature that the signal light field and the idle light field are controlled according to the temperature gap is degeneracy point.Temperature control
Instrument 301 according to the temperature gap by current feedback to Peltier element 303, by control Peltier element to nonlinear crystal
Temperature control is carried out, temperature gap is decreased to zero, the accurate temperature controlling to nonlinear crystal 101 is realized, to control the signal light
The reaction temperature of field and the idle light field is degeneracy point, at this point, pumping light power control is shaken in the optical parameter
When swinging the threshold value of device 1 or less, the optical parametric oscillator 1 exports stable squeezed vacuum state light field.
Therefore, a kind of squeezed vacuum state light field generation method provided through the invention, can be to optical parametric oscillator
The long locking of chamber is carried out, the squeezed vacuum state light field for stablizing output is obtained.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of squeezed vacuum state light field generating means, which is characterized in that described device includes: laser, optical parametric oscillator
It is device, frequency shifting arrangement, temperature regulating device, lock chamber device, half-wave plate, the first polarized light beam splitting mirror, the second polarized light beam splitting mirror, double-colored
Mirror；
The laser is for generating continuous single-frequency laser；
The first polarized light beam splitting mirror, is arranged on the first emitting light path of the laser, is used for the continuous single-frequency
Laser reflection obtains simulated light to the optical parametric oscillator；
The frequency shifting arrangement is arranged on the second emitting light path of the laser, is used for according to the simulated light to the company
Continuous single-frequency laser carries out frequency displacement, obtains fill-in light；
The half-wave plate is arranged on the emitting light path of the frequency shifting arrangement, and the polarization direction for controlling the fill-in light is
Horizontal polarization；
The fill-in light is transmitted through the optical parametric oscillator by the first polarized light beam splitting mirror；
The optical parametric oscillator is arranged on the emitting light path of the first polarized light beam splitting mirror, for the auxiliary
Light is transmitted, and the first transmitted light is obtained；
The dichroic mirror is arranged on the emitting light path of the optical parametric oscillator, for carrying out to first transmitted light
Reflection, obtains the first reflected light；
The continuous single-frequency laser that the laser is launched is transmitted through the optical parametric oscillator by the dichroic mirror,
As pump light, squeezed vacuum state light field is generated according to optical parametric oscillator described in the pumping optical pumping；
The second polarized light beam splitting mirror is arranged on the dichroic mirror emitting light path, for carrying out to first reflected light
Transmission, obtains the second transmitted light；
The lock chamber device, is arranged on the emitting light path of the second polarized light beam splitting mirror, for receiving second transmission
Light；The lock chamber device, connect with the optical parametric oscillator, is used for according to second transmitted light to the optical parameter
Oscillator carries out the long locking of chamber；
The temperature regulating device is connect with the optical parametric oscillator, for controlling the crystal in the optical parametric oscillator
Temperature；
The lock chamber device includes photodetector, lock-in amplifier, proportional plus integral plus derivative controller and high-voltage amplifier；
The photodetector is arranged on the emitting light path of the second polarized light beam splitting mirror, for transmiting described second
Light is converted to electric signal；
The signal input part of the lock-in amplifier is connect with the signal output end of the photodetector, for according to the electricity
Signal obtains error signal；
The signal input part of the proportional plus integral plus derivative controller is connect with the error-signal output of the lock-in amplifier, is used
It is adjusted in the error signal, obtains regulating error signal；
The signal input part of the high-voltage amplifier respectively with the modulated signal output end of the lock-in amplifier and described
The signal output end of proportional plus integral plus derivative controller connects；The high-voltage amplifier is used to believe the modulation of the lock-in amplifier
Number and the regulating error signal carry out Hybrid amplifier, obtain lock chamber signal；
Piezoelectric ceramics, the signal control of the signal output end of the high-voltage amplifier and the piezoelectric ceramics are provided on plano-concave mirror
End connection；
The temperature regulating device includes temperature controller, Peltier element, thermistor and holding furnace；
The outside of nonlinear crystal is arranged in the holding furnace, for keeping the temperature to nonlinear crystal；
The thermistor is arranged in the holding furnace, for measuring the actual temperature of nonlinear crystal；And by the reality
Temperature is sent to the temperature controller；
The temperature controller, for setting the operating temperature of the nonlinear crystal；And calculate the actual temperature and the work
The difference of temperature, obtains temperature gap；The temperature controller controls the Peltier element according to the temperature gap；
The Peltier element is arranged in the holding furnace, connect with the temperature controller, for adjusting the nonlinear crystal
Temperature.
2. the apparatus according to claim 1, which is characterized in that the frequency shifting arrangement includes signal generator, power amplification
Device, electro-optic phase modulator；
The signal generator, for generating sine wave signal；
The power amplifier is connect with the signal generator, for amplifying to the sine wave signal, is amplified
Signal；
The electro-optic phase modulator is connect with the power amplifier, is put for receiving the amplified signal, and according to described
Big signal and the simulated light carry out frequency displacement to the continuous single-frequency laser, obtain the fill-in light.
3. the apparatus according to claim 1, which is characterized in that the optical parametric oscillator includes plano-concave mirror, non-linear
Crystal；
The plano-concave mirror, is arranged on the transmitted light path of the dichroic mirror, described non-linear for the pump light to be transmitted through
The inside of crystal；
The nonlinear crystal is arranged on the transmitted light path of the plano-concave mirror, described true for being generated according to the pump light
Empty compressed state optical field；
The fill-in light is transmitted through the plano-concave mirror by the nonlinear crystal, and the fill-in light is transmitted through by the plano-concave mirror
The dichroic mirror obtains the first transmitted light.
4. a kind of squeezed vacuum state light field generation method, which is characterized in that the method is applied to one kind described in claim 1
Squeezed vacuum state light field generating means,
The described method includes:
Obtain continuous single-frequency laser；
The continuous single-frequency laser is reflected, simulated light is obtained；
Frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, obtains fill-in light；
The fill-in light is converted into electric signal；
The electric signal is mixed, demodulation filtering with the modulated signal of the lock-in amplifier, obtains error signal；
Proportional integration, differential control are carried out to the error signal, obtain regulating error signal；
Hybrid amplifier is carried out to the modulated signal and the regulating error signal, obtains lock chamber signal；
The long locking of chamber is carried out according to the lock chamber signal；
Generate stable squeezed vacuum state light field.
5. according to the method described in claim 4, it is characterized in that, described generate stable squeezed vacuum state light field, specific packet
It includes:
Obtain pump light；
The pump light generates signal light field and idle light field by optical parametric oscillator process；
The reaction temperature for controlling the signal light field and the idle light field is degeneracy point, while by the power control of the pump light
It makes in threshold value hereinafter, generating stable squeezed vacuum state light field.
6. according to the method described in claim 4, it is characterized in that, it is described according to the simulated light to the continuous single-frequency laser
Frequency displacement is carried out, fill-in light is obtained, specifically includes:
Obtain sine wave signal；
The sine wave signal is amplified, amplified signal is obtained；
Frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, obtains fill-in light.
7. method according to claim 5, which is characterized in that described to control the anti-of the signal light field and the idle light field
Answering temperature is degeneracy point, is specifically included:
Set the operating temperature of the signal light field and the idle light field；
Obtain the actual temperature of the signal light field and the idle light field；
The difference for calculating the operating temperature Yu the actual temperature, obtains temperature gap；
The reaction temperature that the signal light field and the idle light field are controlled according to the temperature gap is degeneracy point.
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| CN109596148B (en) * | 2018-12-07 | 2020-04-17 | 山西大学 | Method for improving interference efficiency of compressed light detection device |
| CN110068978B (en) * | 2019-04-30 | 2020-06-12 | 山西大学 | Non-classical optical field generator with self-compensated phase |
| CN112051696B (en) * | 2020-08-21 | 2021-09-28 | 山西大学 | Miniaturized compression source generating device |
| CN113098405A (en) * | 2021-04-06 | 2021-07-09 | 毕思文 | Phase sensitive amplifier based on vacuum compression state injection |
| CN113189768B (en) * | 2021-04-12 | 2022-11-11 | 山西大学 | Device and method for extracting vacuum side die |
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